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Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Synoptic Study of a Medium-Scale Oceanic Cyclone during AMTEX '75  

Science Conference Proceedings (OSTI)

A severe extratropical cyclcone was initiated from a low-level medium-scale cyclone over the ocean northeast of Taiwan during the initial phase of the AMTEX '75. The analyses of Soliz and Fein were used to examine the time evolution and the three-...

Tsing-Chang Chen; Chia-Bo Chang; Donald J. Perkey

1985-03-01T23:59:59.000Z

2

Tropical Cyclone Cloudbands  

Science Conference Proceedings (OSTI)

The outer cloudband structure of a tropical cyclone is kinematically treated as the manifestation of a forced set of waves stationary with respect to the cyclone. When the cyclone wind field is modeled as a Rankine vortex and the cloudbands are ...

Tom Beer; L. Giannini

1980-07-01T23:59:59.000Z

3

Seasonal tropical cyclone forecasts  

E-Print Network (OSTI)

Seasonal forecasts of tropical cyclone activity in various regions have been developed since the first attempts in the early 1980s by Neville

Suzana J. Camargo; Anthony G. Barnston; Philip J. Klotzbach; Christopher W. Landsea

2007-01-01T23:59:59.000Z

4

Compact cyclone filter train for radiological and hazardous environments  

DOE Patents (OSTI)

A compact cyclone filter train for the removal of hazardous and radiologi particles from a gaseous fluid medium which permits a small cyclone separator to be used in a very small space envelope due to the arrangement of the filter housing adjacent to the separator with the cyclone separator and the filters mounted on a plate. The entire unit will have a hoist connection at the center of gravity so that the entire unit including the separator, the filters, and the base can be lifted and repositioned as desired.

Bench, Thomas R. (Pittsburgh, PA)

1998-01-01T23:59:59.000Z

5

Compact cyclone filter train for radiological and hazardous environments  

DOE Patents (OSTI)

A compact cyclone filter train is disclosed for the removal of hazardous and radiological particles from a gaseous fluid medium. This filter train permits a small cyclone separator to be used in a very small space envelope due to the arrangement of the filter housing adjacent to the separator with the cyclone separator and the filters mounted on a plate. The entire unit will have a hoist connection at the center of gravity so that the entire unit including the separator, the filters, and the base can be lifted and repositioned as desired. 3 figs.

Bench, T.R.

1998-04-28T23:59:59.000Z

6

Compact cyclone filter train for radiological and hazardous environments  

DOE Patents (OSTI)

A compact cyclone filter train is described for the removal of hazardous and radiological particles from a gaseous fluid medium which permits a small cyclone separator to be used in a very small space envelope due to the arrangement of the filter housing adjacent to the separator with the cyclone separators and the filters mounted on a plate. The entire unit will have a hoist connection at the center of gravity so that the entire unit including the separator, the filters, and the base can be lifted and repositioned as desired.

Bench, T.R.

1996-12-31T23:59:59.000Z

7

Clouds in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Clouds within the inner regions of tropical cyclones are unlike those anywhere else in the atmosphere. Convective clouds contributing to cyclogenesis have rotational and deep intense updrafts but tend to have relatively weak downdrafts. Within ...

Robert A. Houze Jr.

2010-02-01T23:59:59.000Z

8

Clouds in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Clouds within the inner regions of tropical cyclones are unlike those anywhere else in the atmosphere. Convective clouds contributing to cyclogenesis have rotational and deep intense updrafts but tend to have relatively weak downdrafts. Within the ...

Robert A. Houze Jr.

2010-02-01T23:59:59.000Z

9

Tropical Cyclone Eye Thermodynamics  

Science Conference Proceedings (OSTI)

In intense tropical cyclones, sea level pressures at the center are 50–100 hPa lower than outside the vortex, but only 10–30 hPa of the total pressure fall occurs inside the eye between the eyewall and the center. Warming by dry subsidence ...

H. E. Willoughby

1998-12-01T23:59:59.000Z

10

Tropical Cyclone Eye Dynamics  

Science Conference Proceedings (OSTI)

A new perspective of the dynamics of a tropical cyclone eye is given in which eye subsidence and the adiabatic warming accompanying it are accounted for directly from the equations of motion. Subsidence is driven by an adverse, axial gradient of ...

R. K. Smith

1980-06-01T23:59:59.000Z

11

Tropical Cyclone Formation  

Science Conference Proceedings (OSTI)

The physics of tropical cyclone formation is not well understood, and more is known about the mature hurricane than the formative mechanisms that produce it. It is believed part of the reason for this can be traced to insufficient upper-level ...

Michael T. Montgomery; Brian F. Farrell

1993-01-01T23:59:59.000Z

12

Regional Differences in the Prediction of Extratropical Cyclones by the ECMWF Ensemble Prediction System  

Science Conference Proceedings (OSTI)

A regional study of the prediction of extratropical cyclones by the European Centre for Medium-Range Weather Forecasts (ECMWF) Ensemble Prediction System (EPS) has been performed. An objective feature-tracking method has been used to identify and ...

Lizzie S. R. Froude

2009-03-01T23:59:59.000Z

13

Eastern Hemisphere Tropical Cyclones of 1996  

Science Conference Proceedings (OSTI)

This paper is an annual summary of the Eastern Hemisphere tropical cyclones of 1996. The tropical cyclone statistics presented derive from records at the Joint Typhoon Warning Center, Guam. Although the text focuses on the tropical cyclones that ...

Mark A. Lander; Eric J. Trehubenko; Charles P. Guard

1999-06-01T23:59:59.000Z

14

Midlevel Ventilation's Constraint on Tropical Cyclone Intensity  

E-Print Network (OSTI)

Midlevel ventilation, or the flux of low-entropy air into the inner core of a tropical cyclone (TC), is a hypothesized mechanism by which environmental vertical wind shear can constrain a tropical cyclone’s intensity. An ...

Tang, Brian Hong-An

15

An Objective Cyclone Climatology for the Southern Hemisphere  

Science Conference Proceedings (OSTI)

An objective method is developed and used to derive a climatology of centers of cyclonic vorticity for the Southern Hemisphere, based on twice-daily European Centre for Medium-Range Weather Forecasts (ECMWF) 1000-hPa analyses during 1980–86. ...

Mark R. Sinclair

1994-10-01T23:59:59.000Z

16

Statistical modelling of tropical cyclone tracks: modelling cyclone lysis  

E-Print Network (OSTI)

We describe results from the fifth stage of a project to build a statistical model of tropical cyclone tracks. The previous stages considered genesis and the shape of tracks. We now consider in more detail how to represent the lysis (death) of tropical cyclones. Improving the lysis model turns out to bring a significant improvement to the track model overall.

Hall, T; Hall, Tim; Jewson, Stephen

2005-01-01T23:59:59.000Z

17

Flame Doctor for Cyclone Boilers  

Science Conference Proceedings (OSTI)

NOx control and combustion optimization in cyclone boilers requires a monitoring technique that can assess the quality of combustion in the burner and barrel and provide guidance to the operator to make adjustments in the air distribution. This report describes the results through the end of 2008 of a beta demonstration of the Flame Doctor combustion diagnostic system at five working cyclone boilers.

2009-07-22T23:59:59.000Z

18

Tropical Cyclone Winds from Scatterometer Winds  

E-Print Network (OSTI)

this paper, wc demonstrate that accurate estimates of tropical cyclone intensity over data sparse ocean regions

Carol S. Hsu; W. Timothy Liu

1995-01-01T23:59:59.000Z

19

Historical Global Tropical Cyclone Landfalls  

Science Conference Proceedings (OSTI)

In recent decades, economic damage from tropical cyclones (TCs) around the world has increased dramatically. Scientific literature published to date finds that the increase in losses can be explained entirely by societal changes (such as ...

Jessica Weinkle; Ryan Maue; Roger Pielke Jr

2012-07-01T23:59:59.000Z

20

Tropical Cyclones and Climate Change  

E-Print Network (OSTI)

Whether the characteristics of tropical cyclones have changed or will change in a warming climate — and if so, how — has been the subject of considerable investigation, often with conflicting results. Large amplitude ...

Knutson, Thomas R.

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Flame Doctor for Cyclone Boilers  

Science Conference Proceedings (OSTI)

This development program was designed to enhance monitoring and diagnostic technology for cyclone furnaces using the Flame Doctor combustion diagnostic system. First developed for wall-fired pulverized-coal burner systems and boilers, Flame Doctor allows simultaneous, continuous monitoring and evaluation of each burner in a boiler using signals from optical flame scanners. An initial feasibility test conducted at the AmerenUE Sioux cyclone boiler indicated Flame Doctor technology could be extended to cyc...

2007-12-12T23:59:59.000Z

22

Eastern Hemisphere Tropical Cyclones of 1995  

Science Conference Proceedings (OSTI)

This paper is designed to be an annual summary of the Eastern Hemisphere tropical cyclones of 1995. The tropical cyclone statistics presented are those of the Joint Typhoon Warning Center, Guam. The text focuses primarily upon the tropical ...

Mark A. Lander; Michael D. Angove

1998-02-01T23:59:59.000Z

23

Cyclolysis: A Diagnosis of Two Extratropical Cyclones  

Science Conference Proceedings (OSTI)

This paper presents a diagnosis of the slow decay of two extratropical cyclones that occurred over the central United States in March and November 1999. Results reveal that vertical superposition of the cyclone and upper-level troughs is not ...

William E. Morris Jr.; Phillip J. Smith

2001-11-01T23:59:59.000Z

24

A Ventilation Index for Tropical Cyclones  

E-Print Network (OSTI)

An important environmental control of both tropical cyclone intensity and genesis is vertical wind shear. One hypothesized pathway by which vertical shear affects tropical cyclones is midlevel ventilation—or the flux of ...

Tang, Brian

25

Tropical Cyclone Movement and Surrounding Flow Relationships  

Science Conference Proceedings (OSTI)

This paper presents results of a comprehensive study of the relationship between the movement of tropical cyclones and the large-scale circulation which surrounds them. Cyclones have been stratified by direction and speed of movement, latitude, ...

Johnny C. L. Chan; William M. Gray

1982-10-01T23:59:59.000Z

26

Diagnosing Forecast Errors in Tropical Cyclone Motion  

Science Conference Proceedings (OSTI)

This paper reports on the development of a diagnostic approach that can be used to examine the sources of numerical model forecast error that contribute to degraded tropical cyclone (TC) motion forecasts. Tropical cyclone motion forecasts depend ...

Thomas J. Galarneau Jr.; Christopher A. Davis

2013-02-01T23:59:59.000Z

27

Objective Identification of Cyclones in GCM Simulations  

Science Conference Proceedings (OSTI)

An objective routine for identifying individual cyclones has been developed. The procedure was designed with the aim to keep the input expenditure low. The method ensures a complete collection of cyclones and an exclusion of short time ...

W. König; R. Sausen; F. Sielmann

1993-12-01T23:59:59.000Z

28

Raindrop Size Distribution Measurements in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Characteristics of the raindrop size distribution in seven tropical cyclones have been studied through impact-type disdrometer measurements at three different sites during the 2004–06 Atlantic hurricane seasons. One of the cyclones has been ...

Ali Tokay; Paul G. Bashor; Emad Habib; Takis Kasparis

2008-05-01T23:59:59.000Z

29

Cyclone Power Technologies Inc | Open Energy Information  

Open Energy Info (EERE)

Cyclone Power Technologies Inc Cyclone Power Technologies Inc Jump to: navigation, search Name Cyclone Power Technologies Inc Place Pompano Beach, Florida Zip 33064 Product Florida-based research and development company. The Company holds exclusive commercial rights to the Schoell Cycle Engine, an external combustion, heat-regenerative engine capable of running on any fuel source. References Cyclone Power Technologies Inc[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Cyclone Power Technologies Inc is a company located in Pompano Beach, Florida . References ↑ "Cyclone Power Technologies Inc" Retrieved from "http://en.openei.org/w/index.php?title=Cyclone_Power_Technologies_Inc&oldid=344013

30

Tropical cyclones and climate change review article  

E-Print Network (OSTI)

Whether the characteristics of tropical cyclones have changed or will change in a warming climate — and if so, how — has been the subject of considerable investigation, often with conflicting results. Large amplitude fluctuations in the frequency and intensity of tropical cyclones greatly complicate both the detection of long-term trends and their attribution to rising levels of atmospheric greenhouse gases. Trend detection is further impeded by substantial limitations in the availability and quality of global historical records of tropical cyclones. Therefore, it remains uncertain whether past changes in tropical cyclone activity have exceeded the variability expected from natural causes. However, future projections based on theory and high-resolution dynamical models consistently indicate that greenhouse warming will cause the globally averaged intensity of tropical cyclones to shift towards stronger storms, with intensity increases of 2–11 % by 2100. Existing modelling studies also consistently project decreases in the globally averaged frequency of tropical cyclones, by 6–34%. Balanced against this, higher resolution modelling studies typically project substantial increases in the frequency of the most intense cyclones, and increases of the order of 20% in the precipitation rate within 100 km of the storm centre. For all cyclone parameters, projected changes for individual basins show large variations between different modelling studies. The challenge for climate change detection and attribution research with regard to tropical cyclones is to determine whether an observed change in tropical cyclone activity

Thomas R. Knutson; John L. Mcbride; Johnny Chan; Kerry Emanuel; Greg Holl; Chris L; Isaac Held; James P. Kossin; A. K. Srivastava; Masato Sugi

2010-01-01T23:59:59.000Z

31

A Critical Analysis of a Month-Long Cyclonic Anomaly in the New Zealand-Tasman Sea Region Using Isentropic Vorticity Budgets  

Science Conference Proceedings (OSTI)

The authors investigate the processes acting during a cyclonic “blocking” anomaly that dominated the upper troposphere in the New Zealand-Tasman Sea region during the very stormy month of August 1990. The authors use European Centre for Medium-...

Crispin J. Marks; Michael J. Revell

1994-12-01T23:59:59.000Z

32

Cyclone shelters and cyclone resilient design in coastal areas of Bangladesh  

E-Print Network (OSTI)

Bangladesh is one of those countries that are most vulnerable to tropical cyclones. In recent decades, cyclone mitigations by the Government of Bangladesh and international organizations have greatly increased the coastal ...

Jia, Zheng, M.C.P. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

33

The Spatial Distribution and Evolution Characteristics of North Atlantic Cyclones  

Science Conference Proceedings (OSTI)

A climatology of extratropical cyclones is produced using an objective method of identifying cyclones based on gradients of 1-km height wet-bulb potential temperature. Cyclone track and genesis density statistics are analyzed and this method is ...

H. F. Dacre; S. L. Gray

2009-01-01T23:59:59.000Z

34

A Climatology of Transition Season Colorado Cyclones: 1961–1990  

Science Conference Proceedings (OSTI)

Frequency, track, and intensity characteristics of transition season Colorado cyclones are investigated for the period 1961–90. Monthly cyclone totals are examined for evidence of seasonal frequency variations during the study period. Cyclone ...

Gregory D. Bierly; John A. Harrington Jr.

1995-04-01T23:59:59.000Z

35

Cyclonic Eddies in the Eastern Gulf of Mexico  

Science Conference Proceedings (OSTI)

Cold-domed cyclonic eddies juxtaposed to the cyclonic shear side of the Gulf Loop Current are observed in simultaneously obtained hydrographic, current meter mooring, and satellite infrared data. The cyclones are initially observed in the ...

Fred M. Vukovich; George A. Maul

1985-01-01T23:59:59.000Z

36

Climatology of Cyclone Size Characteristics and Their Changes during the Cyclone Life Cycle  

Science Conference Proceedings (OSTI)

Climatology of the atmospheric cyclone sizes and their change over the cyclone life cycle is analyzed on the basis of tracking 57 yr of NCEP–NCAR reanalysis sea level pressure data over the Northern Hemisphere. To quantify the atmospheric cyclone ...

Irina Rudeva; Sergey K. Gulev

2007-07-01T23:59:59.000Z

37

Simulations of the Extratropical Transition of Tropical Cyclones: Phasing between the Upper-Level Trough and Tropical Cyclones  

Science Conference Proceedings (OSTI)

Whether the tropical cyclone remnants will become a significant extratropical cyclone during the reintensification stage of extratropical transition is a complex problem because of the uncertainty in the tropical cyclone, the midlatitude ...

Elizabeth A. Ritchie; Russell L. Elsberry

2007-03-01T23:59:59.000Z

38

A Climatology of Arabian Sea Cyclonic Storms  

Science Conference Proceedings (OSTI)

On average 1–2 tropical cyclones form over the Arabian Sea each year, and few of these storms are intense enough to be classified as very severe or super cyclonic storms. As such, few studies have explicitly identified the seasonal to interannual ...

Amato T. Evan; Suzana J. Camargo

2011-01-01T23:59:59.000Z

39

A Ventilation Index for Tropical Cyclones  

Science Conference Proceedings (OSTI)

An important environmental control of both tropical cyclone intensity and genesis is vertical wind shear. One hypothesized pathway by which vertical shear affects tropical cyclones is midlevel ventilation—or the flux of low-entropy air into the center of ...

Brian Tang; Kerry Emanuel

2012-12-01T23:59:59.000Z

40

The Interannual Variability of Tropical Cyclones  

Science Conference Proceedings (OSTI)

This paper examines the interannual variability of tropical cyclones in each of the earth’s cyclone basins using data from 1985 to 2003. The data are first analyzed using a Monte Carlo technique to investigate the long-standing myth that the ...

William M. Frank; George S. Young

2007-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Tropical Cyclones as a Critical Phenomenon  

E-Print Network (OSTI)

It has been proposed that the number of tropical cyclones as a function of the energy they release is a decreasing power-law function, up to a characteristic energy cutoff determined by the spatial size of the ocean basin in which the storm occurs. This means that no characteristic scale exists for the energy of tropical cyclones, except for the finite-size effects induced by the boundaries of the basins. This has important implications for the physics of tropical cyclones. We discuss up to what point tropical cyclones are related to critical phenomena (in the same way as earthquakes, rainfall, etc.), providing a consistent picture of the energy balance in the system. Moreover, this perspective allows one to visualize more clearly the effects of global warming on tropical-cyclone occurrence.

Corral, A

2011-01-01T23:59:59.000Z

42

Scaling of Tropical-Cyclone Dissipation  

E-Print Network (OSTI)

The influence of climate variability and global warming on the occurrence of tropical cyclones (TC) is a controversial issue. Existing historical databases on the subject are not fully reliable, but a more fundamental hindrance is the lack of basic understanding regarding the intrinsic nature of tropical cyclone genesis and evolution. It is known that tropical cyclones involve more than a passive response to changing external forcing, but it is not clear which dynamic behaviour best describes them. Here we present a new approach based on the application of the power dissipation index (PDI), which constitutes an estimation of released energy, to individual tropical cyclones. A robust law emerges for the statistics of PDI, valid in four different ocean basins and over long time periods. In addition to suggesting a novel description of the physics of tropical cyclones in terms of critical phenomena, the law allows to quantify their response to changing climatic conditions, with an increase in the largest PDI val...

Osso, Albert; Llebot, J E

2009-01-01T23:59:59.000Z

43

Factors that can influence the onset time of rapid intensification of tropical cyclones  

E-Print Network (OSTI)

The maximum intensity of tropical cyclones in axisymmetricsea interaction theory for tropical cyclones. part i: Steady1995), Sensitivity of tropical cyclones to surface exchange

Bu, Yizhe

2012-01-01T23:59:59.000Z

44

Interannual Variability of Northwest Australian Tropical Cyclones  

Science Conference Proceedings (OSTI)

Tropical cyclone (TC) activity over the southeast Indian Ocean has been studied far less than other TC basins, such as the North Atlantic and northwest Pacific. The authors examine the interannual TC variability of the northwest Australian (NWAUS)...

Kevin H. Goebbert; Lance M. Leslie

2010-09-01T23:59:59.000Z

45

An Investigation of Explosively Deepening Oceanic Cyclones  

Science Conference Proceedings (OSTI)

The explosively deepening oceanic cyclone or “bomb,” one which has central pressure falls of 12 mb (12 h)?1 or greater, has been studied using composites constructed from North Atlantic and Pacific weather ship rawinsonde data during the period ...

Eric Rogers; Lance F. Bosart

1986-04-01T23:59:59.000Z

46

The Automated Tropical Cyclone Forecasting System (ATCF)  

Science Conference Proceedings (OSTI)

The U.S. Navy Automated Tropical Cyclone Forecasting System (ATCF) is an IBM-AT compatible software package developed for the Joint Typhoon Warning Center (JTWC), Guam. ATCF is designed to assist forecasters with the process of making tropical ...

Ronald J. Miller; Ann J. Schrader; Charles R. Sampson; Ted L. Tsui

1990-12-01T23:59:59.000Z

47

Inner Core Strength of Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

The evolution of the wind field beyond the radius of maximum winds is studied for 18 Atlantic tropical cyclones (TCs) with 989 research and reconnaissance flight legs. Inner core strength, defined as the storm relative mean tangential wind from ...

Mark Croxford; Gary M. Barnes

2002-01-01T23:59:59.000Z

48

An Observational Analysis of Tropical Cyclone Recurvature  

Science Conference Proceedings (OSTI)

Data for 21 years (1957–77) of North Pacific rawinsondes were examined to investigate the interaction between the synoptic-scale circulation and tropical cyclones prior to, and during, the recurvature process. This study is believed to be the ...

Stephen Hodanish; William M. Gray

1993-10-01T23:59:59.000Z

49

Mesoscale Evolution of a Continental Occluded Cyclone  

Science Conference Proceedings (OSTI)

A diagnostic study of a continental occluding extratropical cyclone (ETC) during 1–2 November 1992 is presented using initializations from the Mesoscale Atmospheric Prediction System (MAPS), a hybrid sigma–isentropic coordinate model. Whereas ...

Patrick S. Market; James T. Moore

1998-07-01T23:59:59.000Z

50

Experiments with a Spectral Tropical Cyclone Model  

Science Conference Proceedings (OSTI)

The three-layer balanced axisymmetric tropical cyclone model presented by Ooyama is generalized to dimensions and the resultant primitive equations are solved using the spectral (Galerkin) method with Fourier basis functions on a doubly-periodic ...

Mark DeMaria; Wayne H. Schubert

1984-03-01T23:59:59.000Z

51

The Maximum Potential Intensity of Tropical Cyclones  

Science Conference Proceedings (OSTI)

A thermodynamic approach to estimating maximum potential intensity (MPI) of tropical cyclones is described and compared with observations and previous studies. The approach requires an atmospheric temperature sounding, SST, and surface pressure; ...

Greg J. Holland

1997-11-01T23:59:59.000Z

52

Tropical Cyclone Lightning and Rapid Intensity Change  

Science Conference Proceedings (OSTI)

A large sample of Atlantic and eastern North Pacific tropical cyclone cases (2005–10) is used to investigate the relationships between lightning activity and intensity changes for storms over water. The lightning data are obtained from the ground-...

Mark DeMaria; Robert T. DeMaria; John A. Knaff; Debra Molenar

2012-06-01T23:59:59.000Z

53

A Statistical Analysis of Tropical Cyclone Intensity  

Science Conference Proceedings (OSTI)

Cumulative distribution functions (CDFs) of tropical cyclone wind speeds are calculated using best track data from the North Atlantic and western North Pacific basins. Wind speeds are normalized by theoretical potential wind speeds derived from ...

Kerry Emanuel

2000-04-01T23:59:59.000Z

54

Momentum Transports Associated with Tropical Cyclone Recurvature  

Science Conference Proceedings (OSTI)

This study attempts to investigate the linear momentum budget responsible for tropical cyclone (TC) recurvature. Using the operational analyses from the U.K. Meteorological Office global model, the environmental flow associated with recurving TCs ...

Y. S. Li; Johnny C. L. Chan

1999-06-01T23:59:59.000Z

55

Geostationary Doppler Radar and Tropical Cyclone Surveillance  

Science Conference Proceedings (OSTI)

The potential usefulness of spaceborne Doppler radar as a tropical cyclone observing tool is assessed by conducting a high-resolution simulation of an intense hurricane and generating synthetic observations of reflectivity and radial velocity. The ...

William E. Lewis; Eastwood Im; Simone Tanelli; Ziad Haddad; Gregory J. Tripoli; Eric A. Smith

2011-10-01T23:59:59.000Z

56

Satellite Microwave Surface Observations in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Sea surface estimates of local winds, waves, and rain-rate conditions are crucial to complement infrared/visible satellite images in estimating the strength of tropical cyclones (TCs). Satellite measurements at microwave frequencies are thus key ...

Yves Quilfen; Bertrand Chapron; Jean Tournadre

2010-02-01T23:59:59.000Z

57

Rapid Filamentation Zones in Intense Tropical Cyclones  

Science Conference Proceedings (OSTI)

Intense tropical cyclones often possess relatively little convection around their cores. In radar composites, this surrounding region is usually echo-free or contains light stratiform precipitation. While subsidence is typically quite pronounced ...

Christopher M. Rozoff; Wayne H. Schubert; Brian D. McNoldy; James P. Kossin

2006-01-01T23:59:59.000Z

58

Thermodynamic Aspects of Tropical Cyclone Formation  

Science Conference Proceedings (OSTI)

The thermodynamic aspects of tropical cyclone (TC) formation near the center of the wave pouch, a region of approximately closed Lagrangian circulation within the wave critical layer, are examined through diagnoses of a high-resolution numerical ...

Zhuo Wang

2012-08-01T23:59:59.000Z

59

Environmental Control of Tropical Cyclone Intensity  

Science Conference Proceedings (OSTI)

The influence of various environmental factors on tropical cyclone intensity is explored using a simple coupled ocean–atmosphere model. It is first demonstrated that this model is capable of accurately replicating the intensity evolution of ...

Kerry Emanuel; Christopher DesAutels; Christopher Holloway; Robert Korty

2004-04-01T23:59:59.000Z

60

Environmental Factors Affecting Tropical Cyclone Power Dissipation  

Science Conference Proceedings (OSTI)

Revised estimates of kinetic energy production by tropical cyclones in the Atlantic and western North Pacific are presented. These show considerable variability on interannual-to-multidecadal time scales. In the Atlantic, variability on time ...

Kerry Emanuel

2007-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

On Cyclonic Tracks over the Eastern Mediterranean  

Science Conference Proceedings (OSTI)

In this study, an updated and extended climatology of cyclonic tracks affecting the eastern Mediterranean region is presented, in order to better understand the Mediterranean climate and its changes. This climatology includes intermonthly ...

Helena A. Flocas; Ian Simmonds; John Kouroutzoglou; Kevin Keay; Maria Hatzaki; Vicky Bricolas; Demosthenes Asimakopoulos

2010-10-01T23:59:59.000Z

62

Vorticity Equation Terms for Extratropical Cyclones  

Science Conference Proceedings (OSTI)

All terms of the frictionless, nonlinear, vorticity equation are examined. Traditional scale analysis provides one of several justifications for using the quasigeostrophic (QG) system of equations to model extratropical cyclones. Analysts of ...

Richard Grotjahn

1996-12-01T23:59:59.000Z

63

Midlevel ventilation's constraint on tropical cyclone intensity  

E-Print Network (OSTI)

Midlevel ventilation, or the flux of low-entropy air into the inner core of a tropical cyclone (TC), is a hypothesized mechanism by which environmental vertical wind shear can constrain a TC's intensity. An idealized ...

Tang, Brian Hong-An

2010-01-01T23:59:59.000Z

64

Precipitation and Cloud Structure in Midlatitude Cyclones  

Science Conference Proceedings (OSTI)

Composite mean fields and probability distribution functions (PDFs) of rain rate, cloud type and cover, cloud-top temperature, surface wind velocity, and water vapor path (WVP) are constructed using satellite observations of midlatitude cyclones ...

Paul R. Field; Robert Wood

2007-01-01T23:59:59.000Z

65

The Dissipation Structure of Extratropical Cyclones  

Science Conference Proceedings (OSTI)

The physical characteristics of extratropical cyclones are investigated based on nonequilibrium thermodynamics. Nonequilibrium thermodynamics, using entropy as its main tool, has been widely used in many scientific fields. The entropy balance ...

Jiangnan Li; Petr Chylek; Feng Zhang

2014-01-01T23:59:59.000Z

66

Flow simulation in industrial cyclone separator  

Science Conference Proceedings (OSTI)

The problem of ash settling on super-heater tube bank, due to improper velocity distribution, in the cyclone separator used at Circulating Fluidized Bed Combustion (CFBC) has been investigated by means of computational fluid dynamic techniques. With ... Keywords: CAD model, CFD - finite volume technique, Circulating fluidized bed combustion, Flow recirculation - geometry modification, Particle Trajectories, Partition plates, Pressure based algorithms, Pressure drop, Recycle cyclone collector, Structured multi-block grids

C. Bhasker

2010-02-01T23:59:59.000Z

67

A Survey of Extratropical Cyclone Characteristics during GALE  

Science Conference Proceedings (OSTI)

For the population Of cyclones that formed over North America and the adjacent Atlantic Ocean during the Genesis of Atlantic Lows Experiment (GALE; 13 January-16 March 1986), a variety of interrelationships between various cyclone characteristics ...

John W. Nielsen; Randall M. Dole

1992-07-01T23:59:59.000Z

68

An Algorithm for Tracking Eyes of Tropical Cyclones  

Science Conference Proceedings (OSTI)

A tropical cyclone (TC) eye tracking (TCET) algorithm is presented in this study to objectively identify and track the eye and center of a tropical cyclone using radar reflectivity data. Twelve typhoon cases were studied for evaluating the TCET ...

Pao-Liang Chang; Ben Jong-Dao Jou; Jian Zhang

2009-02-01T23:59:59.000Z

69

Comments on “Reexamination of Tropical Cyclone Wind–Pressure Relationship”  

Science Conference Proceedings (OSTI)

In their study on the wind–pressure relationship (WPR) that exists in tropical cyclones, Knaff and Zehr presented results of the use of the Dvorak Atlantic WPR for estimating central pressure and maximum wind speed of tropical cyclones. These ...

Shyamnath Veerasamy

2008-08-01T23:59:59.000Z

70

A Technique for Combining Global Tropical Cyclone Best Track Data  

Science Conference Proceedings (OSTI)

Best track data generally consist of the positions and intensities during the life cycle of a tropical cyclone. Despite the widespread interest in the distribution, frequency, and intensity of tropical cyclones worldwide, no publicly available ...

Michael C. Kruk; Kenneth R. Knapp; David H. Levinson

2010-04-01T23:59:59.000Z

71

On the size distribution of Atlantic tropical cyclones  

E-Print Network (OSTI)

The size of a tropical cyclone is known to vary considerably across storms, though little is understood about the environmental and internal factors that modulate it. Making use of newly available extended tropical cyclone ...

Emanuel, Kerry Andrew

72

Observational Undersampling in Tropical Cyclones and Implications for Estimated Intensity  

Science Conference Proceedings (OSTI)

The maximum surface wind speed is an important parameter for tropical cyclone operational analysis and forecasting, since it defines the intensity of a cyclone. Operational forecast centers typically refer the wind speed to a maximum 1- or 10-min ...

Eric W. Uhlhorn; David S. Nolan

2012-03-01T23:59:59.000Z

73

Monsoonal Interactions Leading to Sudden Tropical Cyclone Track Changes  

Science Conference Proceedings (OSTI)

Sudden poleward track changes of tropical cyclones embedded in monsoon gyres in the western North Pacific are documented. During these track changes, which are generally not well forecast, the cyclones are often accompanied by a separate comma-...

Lester E. Carr III; Russell L. Elsberry

1995-02-01T23:59:59.000Z

74

Predicting Atlantic Basin Seasonal Tropical Cyclone Activity by 1 August  

Science Conference Proceedings (OSTI)

More than 90% of all seasonal Atlantic tropical cyclone activity typically occurs after 1 August. A strong predictive potential exists that allows seasonal forecasts of Atlantic basin tropical cyclone activity to be issued by 1 August, prior to ...

William M. Gray; Christopher W. Landsea; Paul W. Mielke Jr.; Kenneth J. Berry

1993-03-01T23:59:59.000Z

75

Observed Dynamic Structure of an Intense Oceanic Cyclone  

Science Conference Proceedings (OSTI)

A major extratropical cyclone developed over the East China Sea during the initial phase of the AMTEX'75. Using cross-section analyses the dynamic structure of the cyclone is investigated with an emphasis on obtaining a better understanding of ...

C-B. Chang; D. J. Perkey; W-D. Chen

1987-06-01T23:59:59.000Z

76

Aerosol Effects on Microstructure and Intensity of Tropical Cyclones  

Science Conference Proceedings (OSTI)

Improving the forecasts of the intensity of tropical cyclones (TCs) remains a major challenge. One possibility for improvement is consideration of the effects that aerosols have on tropical clouds and cyclones. The authors have been pursuing this under ...

Daniel Rosenfeld; William L. Woodley; Alexander Khain; William R. Cotton; Gustavo Carrió; Isaac Ginis; Joseph H. Golden

2012-07-01T23:59:59.000Z

77

Improving the Accuracy of Mapping Cyclone Numbers and Frequencies  

Science Conference Proceedings (OSTI)

The uncertainties associated with the mapping of cyclone numbers and frequencies are analyzed using the 42-yr winter climatology of cyclone tracks derived from 6-hourly NCEP–NCAR reanalysis. Tracking is performed using an automated procedure, ...

Olga Zolina; Sergey K. Gulev

2002-03-01T23:59:59.000Z

78

Western North Pacific Tropical Cyclone Intensity and ENSO  

Science Conference Proceedings (OSTI)

The influence of the El Niño–Southern Oscillation (ENSO) on tropical cyclone intensity in the western North Pacific basin is examined. Accumulated cyclone energy (ACE), constructed from the best-track dataset for the region for the period 1950–...

Suzana J. Camargo; Adam H. Sobel

2005-08-01T23:59:59.000Z

79

Sensitivity of Tropical Cyclone Rainbands to Ice-Phase Microphysics  

Science Conference Proceedings (OSTI)

A high-resolution tropical cyclone model with explicit cloud microphysics has been used to investigate the dynamics and energetics of tropical cyclone rainbands. As a first step, the model rainbands have been qualitatively compared with observed ...

Charmaine N. Franklin; Greg J. Holland; Peter T. May

2005-08-01T23:59:59.000Z

80

Choosing a Boundary Layer Parameterization for Tropical Cyclone Modeling  

Science Conference Proceedings (OSTI)

The boundary layer in a tropical cyclone is in some respects unlike that elsewhere in the atmosphere. It is therefore necessary to evaluate boundary layer parameterizations for their suitability for use in tropical cyclone simulation. Previous ...

Jeffrey D. Kepert

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Radar Signatures of Tropical Cyclone Tornadoes in Central North Carolina  

Science Conference Proceedings (OSTI)

During the tropical cyclone season of 2004, there were four tropical cyclones that spawned tornadoes in central North Carolina: Frances, Gaston, Ivan, and Jeanne. This study examines the environmental characteristics and radar signatures from ...

Douglas Schneider; Scott Sharp

2007-04-01T23:59:59.000Z

82

Observational Analysis of Tropical Cyclone Formation Associated with Monsoon Gyres  

Science Conference Proceedings (OSTI)

Large-scale monsoon gyres and the involved tropical cyclone formation over the western North Pacific have been documented in previous studies. The aim of this study is to understand how monsoon gyres affect tropical cyclone formation. An ...

Liguang Wu; Huijun Zong; Jia Liang

2013-04-01T23:59:59.000Z

83

A Comparison of Adaptive Observing Guidance for Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

Airborne adaptive observations have been collected for more than two decades in the neighborhood of tropical cyclones, to attempt to improve short-range forecasts of cyclone track. However, only simple subjective strategies for adaptive ...

S. J. Majumdar; S. D. Aberson; C. H. Bishop; R. Buizza; M. S. Peng; C. A. Reynolds

2006-09-01T23:59:59.000Z

84

Composite Trough Evolution of Selected West Pacific Extratropical Cyclones  

Science Conference Proceedings (OSTI)

The observed vertical structures of the trough axes for 27 extratropical cyclones are presented. This study is motivated by results from a simple theoretical model. Two observing times during the cyclone life cycle are shown: prior to development ...

Richard Grotjahn

1996-07-01T23:59:59.000Z

85

An Alternative Tropical Cyclone Intensity Forecast Verification Technique  

Science Conference Proceedings (OSTI)

The National Hurricane Center (NHC) does not verify official or model forecasts if those forecasts call for a tropical cyclone to dissipate or if the real tropical cyclone dissipates. A new technique in which these forecasts are included in a ...

Sim D. Aberson

2008-12-01T23:59:59.000Z

86

Improvements to the Operational Tropical Cyclone Wind Speed Probability Model  

Science Conference Proceedings (OSTI)

The National Hurricane Center Hurricane Probability Program, which estimated the probability of a tropical cyclone passing within a specific distance of a selected set of coastal stations, was replaced by the more general Tropical Cyclone Surface ...

Mark DeMaria; John A. Knaff; Michael J. Brennan; Daniel Brown; Richard D. Knabb; Robert T. DeMaria; Andrea Schumacher; Christopher A. Lauer; David P. Roberts; Charles R. Sampson; Pablo Santos; David Sharp; Katherine A. Winters

2013-06-01T23:59:59.000Z

87

Diminutive Frontal Waves—A Link between Fronts and Cyclones  

Science Conference Proceedings (OSTI)

A number of recent publications have dealt with cyclone identification and tracking. Following on, this paper extends the typical cyclone life cycle back in time to embrace a new feature called a “diminutive frontal wave.” One aim is to improve ...

Tim D. Hewson

2009-01-01T23:59:59.000Z

88

Evaluation of Operational Model Cyclone Structure Forecasts during Extratropical Transition  

Science Conference Proceedings (OSTI)

Cyclone structure is known to be directly linked to the sensible weather effects produced by the weather system. The extratropical transition (ET) process leads to immense changes in cyclone structure and therefore to changes in the associated ...

Jenni L. Evans; Justin M. Arnott; Francesca Chiaromonte

2006-11-01T23:59:59.000Z

89

Interaction of an Intense Extratropical Cyclone with Coastal Orography  

Science Conference Proceedings (OSTI)

Observational analyses and numerical simulations are used to investigate the interaction of an intense extra-tropical cyclone with the coastal orography of the Pacific Northwest. Known as the “Inauguration Day cyclone,” the system made landfall ...

W. James Steenburgh; Clifford F. Mass

1996-07-01T23:59:59.000Z

90

Midlevel Ventilation’s Constraint on Tropical Cyclone Intensity  

Science Conference Proceedings (OSTI)

Midlevel ventilation, or the flux of low-entropy air into the inner core of a tropical cyclone (TC), is a hypothesized mechanism by which environmental vertical wind shear can constrain a tropical cyclone’s intensity. An idealized framework based ...

Brian Tang; Kerry Emanuel

2010-06-01T23:59:59.000Z

91

A new correlation for holdup in gas-solids cyclone  

Science Conference Proceedings (OSTI)

The performance of cyclone as gas to solids heat exchanger depends on the surface area of holdup of the solid particles inside the cyclone. Unlike the conventional heat exchangers where heat transfer area is fixed for a particular heat exchanger, heat ... Keywords: correlation, cyclone, holdup, marquardt-levenberg algorithm, regression

Anuj Jain; A. R. Paul; S. K. Aggarwal; B. Mohanty; B. P. Mani

2011-05-01T23:59:59.000Z

92

Ris0-R-833(EN) Cyclone Gasifier for Biomass  

E-Print Network (OSTI)

Ris0-R-833(EN) Cyclone Gasifier for Biomass Preliminary Investigations Poul Astrup Ris0 National Laboratory, Roskilde, Denmark July 1995 #12;#12;Cyclone Gasifier for Biomass Ris0-R-833(EN) Preliminary at the design of a 20 MW as fired slagging cyclone gasifier for biomass, it has been investigated how biomass

93

An Analysis of the Accuracy of 120-h Predictions by the National Meteorological Center's Medium-Range Forecast Model  

Science Conference Proceedings (OSTI)

An assessment was made of the 120-h predictions by the medium range forecast (MRF) run of the National Meteorological Center's (NMC's) global spectral model. The ability of the model to forecast surface cyclones and anticyclones was evaluated and ...

Mary A. Bedrick; Anthony J. Cristaldi III; Stephen J. Colucci; Daniel S. Wilks

1994-03-01T23:59:59.000Z

94

Finding Tropical Cyclones on a Cloud Computing Cluster: Using Parallel Virtualization for Large-Scale Climate Simulation Analysis  

E-Print Network (OSTI)

Chang. Changes in Tropical Cyclone Number, Duration, andSimulation of Future Tropical Cyclone Statistics in a High-Finding Tropical Cyclones on a Cloud Computing Cluster:

Hasenkamp, Daren

2011-01-01T23:59:59.000Z

95

Tropical Cyclone Intensity and Sea Surface Temperature  

Science Conference Proceedings (OSTI)

It is hypothesized that the effect of the SST on the intensity of tropical cyclones can be separated into two distinct contributions: one from the large-scale SST field that is in equilibrium with the atmosphere, and another one from a local ...

Lars R. Schade

2000-09-01T23:59:59.000Z

96

Tropical Cyclone Contribution to Rainfall over Australia  

Science Conference Proceedings (OSTI)

Tropical cyclone (TC) rainfall over the Australian continent is studied using observations from 41 TC seasons 1969/70 to 2009/10. A total of 318 storms, whose centers either crossed the coastline or were located within 500?km of the coast, are ...

Richard A. Dare; Noel E. Davidson; John L. McBride

2012-11-01T23:59:59.000Z

97

Tropical Cyclone Tornadoes, 1950–2007  

Science Conference Proceedings (OSTI)

An expanded “climatology” of U.S. tropical cyclone (TC) tornadoes covering the period 1950–2007 is presented. A major climatology published in 1991 included data on 626 TC tornadoes. Since then, almost 1200 more TC tornado records have been ...

Lori A. Schultz; Daniel J. Cecil

2009-10-01T23:59:59.000Z

98

The Contribution of Ex–Tropical Cyclone Gert (1999) toward the Weakening of a Midlatitude Cyclogenesis Event  

Science Conference Proceedings (OSTI)

Tropical Cyclone Gert (1999) experienced an extratropical transition while it merged with an extratropical cyclone upstream. The upstream extratropical cyclone had started to intensify before it merged with the transitioning tropical cyclone, and ...

Anna Agustí-Panareda

2008-06-01T23:59:59.000Z

99

Climatology and Interannual Variability of Arctic Cyclone Activity: 1948–2002  

Science Conference Proceedings (OSTI)

Arctic cyclone activity is investigated in the context of climate change and variability by using a modified automated cyclone identification and tracking algorithm, which differs from previously used algorithms by single counting each cyclone. ...

Xiangdong Zhang; John E. Walsh; Jing Zhang; Uma S. Bhatt; Moto Ikeda

2004-06-01T23:59:59.000Z

100

Extratropical Transition of Southwest Pacific Tropical Cyclones. Part I: Climatology and Mean Structure Changes  

Science Conference Proceedings (OSTI)

A database of tropical cyclone best track and intensity information for the southwest Pacific Ocean basin is used to construct a 28-year climatology for tropical cyclones that move into middle latitudes. Of the nine or so tropical cyclones that ...

Mark R. Sinclair

2002-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

An Analysis of NCEP Tropical Cyclone Vitals and Potential Effects on Forecasting Models  

Science Conference Proceedings (OSTI)

This study analyzes the Tropical Cyclone Vitals Database (TCVitals), which contains cyclone location, intensity, and structure information, generated in real time by forecasters. These data are used to initialize cyclones in several NCEP ...

Sam Trahan; Lynn Sparling

2012-06-01T23:59:59.000Z

102

Northern Hemisphere Extratropical Cyclones: A Comparison of Detection and Tracking Methods and Different Reanalyses  

Science Conference Proceedings (OSTI)

The applicability of three different cyclone detection and tracking schemes is investigated with reanalysis datasets. First, cyclone climatologies and cyclone characteristics of the 40-yr ECMWF Re-Analysis (ERA-40) are compared with the NCEP–NCAR ...

C. C. Raible; P. M. Della-Marta; C. Schwierz; H. Wernli; R. Blender

2008-03-01T23:59:59.000Z

103

The Extratropical Transition of Tropical Cyclones: Forecast Challenges, Current Understanding, and Future Directions  

Science Conference Proceedings (OSTI)

A significant number of tropical cyclones move into the midlatitudes and transform into extratropical cyclones. This process is generally referred to as extratropical transition (ET). During ET a cyclone frequently produces intense rainfall and ...

Sarah C. Jones; Patrick A. Harr; Jim Abraham; Lance F. Bosart; Peter J. Bowyer; Jenni L. Evans; Deborah E. Hanley; Barry N. Hanstrum; Robert E. Hart; François Lalaurette; Mark R. Sinclair; Roger K. Smith; Chris Thorncroft

2003-12-01T23:59:59.000Z

104

Flame Doctor for Cyclone Boilers: Beta Demonstration Program  

Science Conference Proceedings (OSTI)

This report describes the results of the beta demonstration of the Flame Doctor system as it is applied to cyclone boilers.

2012-07-10T23:59:59.000Z

105

The effects of ocean eddies on tropical cyclones.  

E-Print Network (OSTI)

??The purpose of this study is to understand the interactions of tropical cyclones with ocean eddies. In particular we examine the influence of a cold-core… (more)

Miltenberger, Alexander Reid

2012-01-01T23:59:59.000Z

106

JPL Tropical Cyclone Information System Analysis Tool | Data...  

NLE Websites -- All DOE Office Websites (Extended Search)

JPL Tropical Cyclone Information System Analysis Tool Dataset Summary Description This tool will let you analyze data associated with a storm. You can plot histograms, maps, and...

107

RSS Feeds for Specific Tropical Cyclones of the North Atlantic...  

NLE Websites -- All DOE Office Websites (Extended Search)

RSS Feeds for Specific Tropical Cyclones of the North Atlantic, Caribbean Sea, and Gulf of Mexico (English) Agriculture Community Menu DATA APPS EVENTS DEVELOPER STATISTICS...

108

The Association of Tall Eyewall Convection with Tropical Cyclone Intensification .  

E-Print Network (OSTI)

??Despite decades of research, operational weather agencies still find it difficult to predict change in the intensity of a tropical cyclone's surface wind. This dissertation… (more)

Kelley, Owen A.

2008-01-01T23:59:59.000Z

109

A Diagnostic Study of Two Intense Oceanic Cyclones  

Science Conference Proceedings (OSTI)

A diagnostic study of two intense oceanic cyclones (16–18 November 1972 and 9–11 January 1982) along the east coast of North America is presented. Both cyclones formed along a strong low-level baroclinic zone and deepened in response to an ...

Eric Rogers; Lance F. Bosart

1991-04-01T23:59:59.000Z

110

Using Frontogenesis to Identify Sting Jets in Extratropical Cyclones  

Science Conference Proceedings (OSTI)

Sting jets, or surface wind maxima at the end of bent-back fronts in Shapiro–Keyser cyclones, are one cause of strong winds in extratropical cyclones. Although previous studies identified the release of conditional symmetric instability as a cause ...

David M. Schultz; Joseph M. Sienkiewicz

2013-06-01T23:59:59.000Z

111

Automatic tropical cyclone eye fix using genetic algorithm  

Science Conference Proceedings (OSTI)

Tropical cyclones (TCs) are weather systems with vast destructive power. To forecast TC tracks, forecasters need to locate their circulation centers, or eyes. This eye fix process is often done manually in practice. Since subjective elements are involved ... Keywords: Genetic algorithm, Meteorological computing, Tropical cyclone eye fix, Weather forecasting, Weather system modeling

Ka Yan Wong; Chi Lap Yip; Ping Wah Li

2008-01-01T23:59:59.000Z

112

A Rapid Loss Index for Tropical Cyclone Disasters in China  

Science Conference Proceedings (OSTI)

Disaster emergency response needs rapid estimation on disaster loss. In China it is of great importance to develop a loss index for rapidly assessing tropical cyclone (TC) disaster loss. In this paper, a new composite loss index for TC landing on China ... Keywords: Tropical Cyclone, Disaster, Loss Index, Rapid Loss Assessment

Ying Li; Weihua Fang

2012-06-01T23:59:59.000Z

113

Classifying North Atlantic Tropical Cyclone Tracks by Mass Moments  

Science Conference Proceedings (OSTI)

A new method for classifying tropical cyclones or similar features is introduced. The cyclone track is considered as an open spatial curve, with the wind speed or power information along the curve considered to be a mass attribute. The first and ...

Jennifer Nakamura; Upmanu Lall; Yochanan Kushnir; Suzana J. Camargo

2009-10-01T23:59:59.000Z

114

Assessing the Skill of Operational Atlantic Seasonal Tropical Cyclone Forecasts  

Science Conference Proceedings (OSTI)

Since 1984, W. Gray of Colorado State University and a team of researchers have been issuing seasonal tropical cyclone forecasts for the North Atlantic Ocean. Prior to this, little work had been done in the area of long-term tropical cyclone ...

Brian F. Owens; Christopher W. Landsea

2003-02-01T23:59:59.000Z

115

Ocean Barrier Layers’ Effect on Tropical Cyclone Intensification  

SciTech Connect

Improving a tropical cyclone's forecast and mitigating its destructive potential requires knowledge of various environmental factors that influence the cyclone's path and intensity. Herein, using a combination of observations and model simulations, we systematically demonstrate that tropical cyclone intensification is significantly affected by salinity-induced barrier layers, which are 'quasi-permanent' features in the upper tropical oceans. When tropical cyclones pass over regions with barrier layers, the increased stratification and stability within the layer reduce storm-induced vertical mixing and sea surface temperature cooling. This causes an increase in enthalpy flux from the ocean to the atmosphere and, consequently, an intensification of tropical cyclones. On average, the tropical cyclone intensification rate is nearly 50% higher over regions with barrier layers, compared to regions without. Our finding, which underscores the importance of observing not only the upper-ocean thermal structure but also the salinity structure in deep tropical barrier layer regions, may be a key to more skillful predictions of tropical cyclone intensities through improved ocean state estimates and simulations of barrier layer processes. As the hydrological cycle responds to global warming, any associated changes in the barrier layer distribution must be considered in projecting future tropical cyclone activity.

Balaguru, Karthik; Chang, P.; Saravanan, R.; Leung, Lai-Yung R.; Xu, Zhao; Li, M.; Hsieh, J.

2012-09-04T23:59:59.000Z

116

The Dynamics and Predictability of Tropical Cyclones  

E-Print Network (OSTI)

Through methodology unique for tropical cyclones in peer-reviewed literature, this study explores how the dynamics of moist convection affects the predictability of tropical cyclogenesis. Mesoscale models are used to perform short-range ensemble forecasts of a non-developing disturbance in 2004 and Hurricane Humberto in 2007; both of these cases were highly unpredictable. Taking advantage of discrepancies between ensemble members in short-range ensemble forecasts, statistical correlation is used to pinpoint sources of error in forecasts of tropical cyclone formation and intensification. Despite significant differences in methodology, storm environment and development, it is found in both situations that high convective instability (CAPE) and mid-level moisture are two of the most important factors for genesis. In the gulf low, differences in CAPE are related to variance in quasi-geostrophic lift, and in Humberto the differences are related to the degree of interaction between the cyclone and a nearby front. Regardless of the source of CAPE variance, higher CAPE and mid-level moisture combine to yield more active initial convection and more numerous and strong vortical hot towers (VHTs), which incrementally contribute to a stronger vortex. In both cases, strength differences between ensemble members are further amplified by differences in convection that are related to oceanic heat fluxes. Eventually the WISHE mechanism results in even larger ensemble spread, and in the case of Humberto, uncertainty related to the time of landfall drives spread even higher. It is also shown that initial condition differences much smaller than current analysis error can ultimately control whether or not a tropical cyclone forms. Furthermore, even smaller differences govern how the initial vortex is built. Differences in maximum winds and/or vorticity vary nonlinearly with initial condition differences and depend on the timing and intensity of small mesoscale features such as VHTs and cold pools. Finally, the strong sensitivity to initial condition differences in both cases exemplifies the inherent uncertainties in hurricane intensity prediction. This study illustrates the need for implementing advanced data analysis schemes and ensemble prediction systems to provide more accurate and event-dependent probabilistic forecasts.

Sippel, Jason A.

2008-12-01T23:59:59.000Z

117

Prediction and Diagnosis of Tropical Cyclone Formation in an NWP System. Part II: A Diagnosis of Tropical Cyclone Chris Formation  

Science Conference Proceedings (OSTI)

This is the second of a three-part investigation into tropical cyclone (TC) genesis in the Australian Bureau of Meteorology’s Tropical Cyclone Limited Area Prediction System (TC-LAPS). The primary TC-LAPS vortex enhancement mechanism (convergence/...

K. J. Tory; M. T. Montgomery; N. E. Davidson; J. D. Kepert

2006-12-01T23:59:59.000Z

118

Cyclone Boiler Reburn NOx Control Improvements via Cyclone Design Improvements and Advanced Air Staging  

E-Print Network (OSTI)

Eastman Kodak owns three Babcock & Wilcox coal fired cyclone boilers and one Combustion Engineering pulverized coal boiler located at Kodak Park in Rochester, New York. Duke Energy Generation Services (DEGS) operates and maintains the steam and electric generation equipment for Kodak and has primary responsibility for related capital project development and execution. The Kodak plant is capable of generating approximately 1,900,000 pounds of steam and 130 MW’s of electrical power. To achieve the required level of NOx control, Kodak chose The Babcock & Wilcox (B&W) Company's, Natural Gas Reburn technology for the three cyclone boilers. The relatively low capital cost of the system and reasonable cost of natural gas in the mid 1990’s made Natural Gas Reburn an economic fit for the RACT requirements of 0.60#’s/Mmbtu NOx. The run up in natural gas prices since 2002 has increased the cost of NOx removed from ~ $2000/ton to ~$5000/ton based on fuel expense alone. In an effort to curtail the cost of control, Duke Energy Generations Services and Kodak implemented a series of projects that integrated Cyclone Design Improvements and Advancements in Air Staging along with ESP inlet flue modifications that resulted in decreasing the Natural Gas required for NOx control ~ 40% from baseline levels saving the plant several million dollars per year in fuel expense. Significant improvements in opacity and filterable PM were also realized by these changes.

Morabito, B.; Nee, B.; Goff, V.; Maringo, G.

2008-01-01T23:59:59.000Z

119

Optimizing the efficiency of cylindrical cyclone gas/liquid separators for field applications  

E-Print Network (OSTI)

Problems associated with the use of compact cylindrical cyclone gas/liquid (CCGL) separators can be attributed to two physical phenomena: gas carry-under and liquid carryover (LCO). Inadequate understanding of the complex multiphase hydrodynamic flow pattern inside the cylindrical separator has inhibited complete confidence in its design and use, hence the need for more research. While many works have been done with a fixed inlet slot to predict the operational efficiency of the cyclone separator, very little is known about how separator performance can be influenced due to changes in fluid properties. During the operations of the CCGL separator the complex flow situations arising from severe foaming within the separator has not been addressed. Also the effects of emulsion formation under three phase flow conditions on the properties of cyclone separators are yet to be studied. An understanding of liquid holdup and hydrodynamic nature of flow in a compact separator under zero net liquid flow (ZNLF) and zero net gas flow (ZNGF) conditions is necessary in many field applications, especially for the prediction of LCO and in the design of the CCGL separators. Also, ZNLF holdup is an important parameter in predicting bottom-hole pressures in pumping oil wells. This research investigated the effects of fluid properties such as density, foam and emulsion formation on ZNLF, zero net gas flow ZNGF, and LCO in compact cyclone separators; this was achieved by replacing water, which is the conventional fluid used as the liquid medium in many previous research efforts with a foamy oil while maintaining air as the gas phase. Variable-inlet-slots that regulate the artificial gravity environment created by the separator were used to check for improved separator performance. Also experiments to check separator response to a range of water-cut in three-phase flow were performed. All experiments were carried out under low constant separator pressures. The ZNLF holdup is observed to decrease as the density of the fluid medium decreases. Varying the inlet slot configurations and recombination points does not have any effect on the ZNLF holdup when changes in density of the liquid phase occur. Comparisons with previous work show that there exists a wide variation in the LCO operational envelope when severe foaming occurs in the CCGL separator. At high watercut (greater than 30%), the separator LCO performance was observed to be normal. However, at water-cut below 30%, LCO was initiated much earlier; this is attributed to severe foaming in the CCGL separator.

Adebare, Adedeji

2006-08-01T23:59:59.000Z

120

Changes in the Risk of Extratropical Cyclones in Eastern Australia  

Science Conference Proceedings (OSTI)

The east coast of Australia is a region of the world where a particular type of extratropical cyclone, known locally as an east coast low, frequently occurs with severe consequences such as extreme rainfall, winds, and waves. The likelihood of ...

Andrew J. Dowdy; Graham A. Mills; Bertrand Timbal; Yang Wang

2013-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Estimating Local Memory of Tropical Cyclones through MPI Anomaly Evolution  

Science Conference Proceedings (OSTI)

This study examines the local memory of atmospheric and oceanic changes associated with a tropical cyclone (TC). The memory is quantified through anomalous maximum potential intensity (MPI) evolution for 20 days prior to the arrival of a TC ...

Robert E. Hart; Ryan N. Maue; Michael C. Watson

2007-12-01T23:59:59.000Z

122

On Estimates of Historical North Atlantic Tropical Cyclone Activity  

Science Conference Proceedings (OSTI)

In this study, an estimate of the expected number of Atlantic tropical cyclones (TCs) that were missed by the observing system in the presatellite era (between 1878 and 1965) is developed. The significance of trends in both number and duration ...

Gabriel A. Vecchi; Thomas R. Knutson

2008-07-01T23:59:59.000Z

123

Hydrologic Processes Associated with Cyclone Systems over the United States  

Science Conference Proceedings (OSTI)

A substantial amount of precipitation in the midlatitudes occurs in association with extratropical cyclones. Using the data generated by version 1 of the Goddard Earth Observing System (GEOS-1) Data Assimilation System for 1985-89, hydrologic ...

Tsing-Chang Chen; Ming-Cheng Yen; Siegfried Schubert

1996-07-01T23:59:59.000Z

124

Lightning Distribution and Eyewall Outbreaks in Tropical Cyclones during Landfall  

Science Conference Proceedings (OSTI)

Cloud-to-ground lightning data and storm intensity data (winds and central pressure) for 33 northwest Pacific tropical cyclones were used to analyze lightning distributions during the period of landfall in China. Lightning activities varied ...

Wenjuan Zhang; Yijun Zhang; Dong Zheng; Xiuji Zhou

2012-11-01T23:59:59.000Z

125

Axisymmetric, Primitive Equation, Spectral Tropical Cyclone Model. Part I: Formulation  

Science Conference Proceedings (OSTI)

Beginning with the nine nonlinear governing equations for the simplest three-layer, axisymmetric, primitive equation, tropical cyclone model, we first introduce a vertical transform which decouples the linear part of the dynamics into three sets (...

Wayne H. Schubert; Mark DeMaria

1985-06-01T23:59:59.000Z

126

The Form of Cyclonic Precipitation and Its Thermal Impact  

Science Conference Proceedings (OSTI)

A two-dimensional, parameterized kinematic cloud microphysics model is described and used to simulate the form of cyclonic precipitation and its thermal impact in three idealized situations. The first situation represents a strong, warm, or ...

Stanley David Gedzelman; Robert Arnold

1993-07-01T23:59:59.000Z

127

Estimating Tropical Cyclone Intensity from Infrared Image Data  

Science Conference Proceedings (OSTI)

This paper describes results from a near-real-time objective technique for estimating the intensity of tropical cyclones from satellite infrared imagery in the North Atlantic Ocean basin. The technique quantifies the level of organization or ...

Miguel F. Piñeros; Elizabeth A. Ritchie; J. Scott Tyo

2011-10-01T23:59:59.000Z

128

Do Gravity Waves Transport Angular Momentum away from Tropical Cyclones?  

Science Conference Proceedings (OSTI)

Previous studies have suggested that gravity waves can transport a significantly large amount of angular momentum away from tropical cyclones, as much as 10% of the core angular momentum per hour. These previous studies used the shallow-water ...

Yumin Moon; David S. Nolan

2010-01-01T23:59:59.000Z

129

Kelvin-Type Coastal Surges Generated by Tropical Cyclones  

Science Conference Proceedings (OSTI)

Measurements of sea level along the coat of Western Australia during the period 1969 to 1982. when 12 southward moving tropical cyclones occurred, showed distinct peaks with amplitudes of about 1 to 2 m propagating southwards with speeds ranging ...

C. B. Fandry; L. M. Leslie; R. K. Steedman

1984-03-01T23:59:59.000Z

130

A Simplified System of Equations for Simulation of Tropical Cyclones  

Science Conference Proceedings (OSTI)

A simplified system of equations which can simulate the development and mature stages of tropical cyclones is presented. The model is similar to that presented by Ooyama, except that the assumption of incompressible fluid layers is relaxed. ...

Mark DeMaria; John D. Pickle

1988-05-01T23:59:59.000Z

131

Tropical Cyclone Observation and Forecasting with and without Aircraft Reconnaissance  

Science Conference Proceedings (OSTI)

The contributions of aircraft reconnaissance to the accuracy of tropical cyclone center positioning, motion, and intensity determinations are examined, along with their impact on the accuracy of track and intensity forecasting. The analyses ...

Joel D. Martin; William M. Gray

1993-12-01T23:59:59.000Z

132

Movement and Vertical Coupling of Adiabatic Baroclinic Tropical Cyclones  

Science Conference Proceedings (OSTI)

The vertical coupling and movement of an adiabatic baroclinic tropical cyclone (TC) are investigated through two numerical experiments in which the TC is affected by either a vertical environmental shear or a differential beta drift. In both ...

Liguang Wu; Bin Wang

2001-07-01T23:59:59.000Z

133

Distribution of Helicity, CAPE, and Shear in Tropical Cyclones  

Science Conference Proceedings (OSTI)

The previous study of helicity, CAPE, and shear in Hurricane Bonnie (1998) was extended to all eight tropical cyclones sampled by NASA during the Convection and Moisture Experiments (CAMEX). Storms were categorized as having large or small ...

John Molinari; David Vollaro

2010-01-01T23:59:59.000Z

134

Objective Tropical Cyclone Center Tracking Using Single-Doppler Radar  

Science Conference Proceedings (OSTI)

This study presents an extension of the ground-based velocity track display (GBVTD)-simplex tropical cyclone (TC) circulation center–finding algorithm to further improve the accuracy and consistency of TC center estimates from single-Doppler radar ...

Michael M. Bell; Wen-Chau Lee

2012-05-01T23:59:59.000Z

135

Arctic Climate Change as Manifest in Cyclone Behavior  

Science Conference Proceedings (OSTI)

The Arctic region has exhibited dramatic changes in recent times. Many of these are intimately tied up with synoptic activity, but little research has been undertaken on how the characteristics of Arctic cyclones have changed. This paper presents ...

Ian Simmonds; Craig Burke; Kevin Keay

2008-11-01T23:59:59.000Z

136

The Isotopic Composition of Precipitation from Two Extratropical Cyclones  

Science Conference Proceedings (OSTI)

Precipitation samples were collected at stations in the Eastern United States for two extratropical cyclones during the Genesis of Atlantic Lows Experiment (GALE) of 1986 and analyzed for their ?18O values. They represent the first synoptic-scale ...

Stanley David Gedzelman; James R. Lawrence

1990-02-01T23:59:59.000Z

137

Tropical Cyclone Motion. A Comparison of Theory and Observation  

Science Conference Proceedings (OSTI)

The analytic predictions of tropical cyclone motion by Holland are shown to be in very good agreement with observations in the Australian southwest Pacific region. These results indicate that a combined linear asymmetric advection and divergence ...

Greg J. Holland

1984-01-01T23:59:59.000Z

138

Tropical Cyclone Tracking Using a Neighbor Enclosed Area Tracking Algorithm  

Science Conference Proceedings (OSTI)

Tropical cyclone (TC) tracking is essential for calculating TC statistics from gridded datasets. A new method for TC tracking is presented here using neighbor enclosed area tracking (NEAT), which is based on the temporal overlap of enclosed areas ...

Yuya Satake; Masaru Inatsu; Masato Mori; Akira Hasegawa

2013-10-01T23:59:59.000Z

139

Probabilistic Prediction of Tropical Cyclones. Part II: Intensity  

Science Conference Proceedings (OSTI)

A new objective aid for operational probabilistic intensity (defined as maximum wind speed) prediction of tropical cyclones is presented. Based on statistical analyses of the performance of all operationally available numerical models (using ...

Harry C. Weber

2005-07-01T23:59:59.000Z

140

Probabilistic Prediction of Tropical Cyclones. Part I: Position  

Science Conference Proceedings (OSTI)

A new objective aid for operational prediction of the positions of tropical cyclones is presented. Its method is based on a simple analysis of the performance of all operationally available numerical models during a training period. In a ...

Harry C. Weber

2005-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

CISK or WISHE as the Mechanism for Tropical Cyclone Intensification  

Science Conference Proceedings (OSTI)

Examination of conditional instability of the second kind (CISK) and wind-induced surface heat exchange (WISHE), two proposed mechanisms for tropical cyclone and polar low intensification, suggests that the sensitivity of the intensification rate ...

George C. Craig; Suzanne L. Gray

1996-12-01T23:59:59.000Z

142

Trends in Northern Hemisphere Surface Cyclone Frequency and Intensity  

Science Conference Proceedings (OSTI)

One of the hypothesized effects of global warming from increasing concentrations of greenhouse gases is a change in the frequency and/or intensity of extratropical cyclones. In this study, winter frequencies and intensities of extratropical ...

Gregory J. McCabe; Martyn P. Clark; Mark C. Serreze

2001-06-01T23:59:59.000Z

143

An Extended Model for the Potential Intensity of Tropical Cyclones  

Science Conference Proceedings (OSTI)

Emanuel’s theory of hurricane potential intensity (E-PI) makes use of the assumption that slantwise convective instability vanishes in a steady-state vortex of a tropical cyclone. In the framework of an extended mathematical potential intensity ...

Thomas Frisius; Daria Schönemann

2012-02-01T23:59:59.000Z

144

A Simplified Dynamical System for Tropical Cyclone Intensity Prediction  

Science Conference Proceedings (OSTI)

A simplified dynamical system for tropical cyclone intensity prediction based on a logistic growth equation (LGE) is developed. The time tendency of the maximum sustained surface winds is proportional to the sum of two terms: a growth term and a ...

Mark DeMaria

2009-01-01T23:59:59.000Z

145

Objective Identification of Cyclones and Their Circulation Intensity, and Climatology  

Science Conference Proceedings (OSTI)

An updated procedure for objective identification and tracking of surface cyclones from gridded analyses is described. Prior smoothing of the raw data with a constant radius spatial filter is used to remove distortions related to the particular ...

Mark R. Sinclair

1997-09-01T23:59:59.000Z

146

The Balanced Dynamical Nature of a Rapidly Intensifying Oceanic Cyclone  

Science Conference Proceedings (OSTI)

Aided with a numerical simulation, the authors diagnose the synoptic-scale evolution of an intense extratropical cyclone over the western Atlantic Ocean from the perspective of balanced dynamics using potential vorticity inversion techniques. The ...

Christopher A. Davis; Evelyn Donall Grell; M. A. Shapiro

1996-01-01T23:59:59.000Z

147

Multidecadal Variability in North Atlantic Tropical Cyclone Activity  

Science Conference Proceedings (OSTI)

Recent increases in Atlantic basin tropical cyclone activity since 1995 and the associated destructive U.S. landfall events in 2004 and 2005 have generated considerable interest into why there has been such a sharp upturn. Natural variability, ...

Philip J. Klotzbach; William M. Gray

2008-08-01T23:59:59.000Z

148

Tropical Cyclone Inner-Core Kinetic Energy Evolution  

Science Conference Proceedings (OSTI)

Tropical cyclone (TC) destructive potential is highly dependent on the distribution of the surface wind field. To gain a better understanding of wind structure evolution, TC 0–200-km wind fields from aircraft reconnaissance flight-level data are ...

Katherine S. Maclay; Mark DeMaria; Thomas H. Vonder Haar

2008-12-01T23:59:59.000Z

149

Life Cycle and Mesoscale Frontal Structure of an Intermountain Cyclone  

Science Conference Proceedings (OSTI)

High-resolution analyses and MesoWest surface observations are used to examine the life cycle and mesoscale frontal structure of the “Tax Day Storm,” an intermountain cyclone that produced the second lowest sea level pressure observed in Utah ...

Gregory L. West; W. James Steenburgh

2010-07-01T23:59:59.000Z

150

Generation of Moving Spiral Bands in Tropical Cyclones  

Science Conference Proceedings (OSTI)

A theory based on the shallow water equation is developed to explain the generation of moving spiral-banded structures in tropical cyclones. The theory proposes that fluctuation of the vorticity distribution in the compact core region can act as ...

K. C. Chow; Kwing L. Chan; Alexis K. H. Lau

2002-10-01T23:59:59.000Z

151

The Frequency and Intensity of Great Lake Cyclones  

Science Conference Proceedings (OSTI)

Cyclones are an important feature of the Great Lakes region that can have important impacts on shipping, lake temperature profiles, ice cover, and shoreline property damages. The objective of this research is to analyze the frequency and ...

James R. Angel; Scott A. Isard

1998-01-01T23:59:59.000Z

152

Vertical Velocity Structures in an Axisymmetric, Nonhydrostatic Tropical Cyclone Model  

Science Conference Proceedings (OSTI)

A statistical analysis of several experiments with different microphysical parameterizations in an axisymmetric, nonhydrostatic tropical cyclone model illustrates the impact of icc-phase microphysics on model vertical velocity structure. The ...

Stephen J. Lord; Jacqueline M. Lord

1988-05-01T23:59:59.000Z

153

Influence of cloud-radiative forcing on tropical cyclone structure  

Science Conference Proceedings (OSTI)

We demonstrate how and why cloud-radiative forcing (CRF), the interaction of hydrometeors with longwave and shortwave radiation, can influence tropical cyclone structure through “semi-idealized” integrations of the Hurricane Weather Research and ...

Yizhe Peggy Bu; Robert G. Fovell; Kristen L. Corbosiero

154

A Potential Vorticity Tendency Diagnostic Approach for Tropical Cyclone Motion  

Science Conference Proceedings (OSTI)

In order to understand the roles of various physical processes in baroclinic tropical cyclone (TC) motion and the vertical coupling between the upper- and lower-level circulations, a new dynamical framework is advanced. A TC is treated as a ...

Liguang Wu; Bin Wang

2000-06-01T23:59:59.000Z

155

The Boundary Layer of Tropical Cyclone Kerry (1979)  

Science Conference Proceedings (OSTI)

The boundary layer structure of Tropical Cyclone Kerry (1979) is investigated using composite analysis of research aircraft, surface ship, and automatic weather station observations. The boundary layer was moist, convective, and strongly ...

Peter G. Black; Greg J. Holland

1995-07-01T23:59:59.000Z

156

Tropical cyclone eye fix using genetic algorithm with temporal information  

Science Conference Proceedings (OSTI)

Tropical cyclones (TCs) are weather systems with vast destructive power. To give early TC warnings, accurate location of their circulation centers, or “eyes”, is required. The pattern matching solution to this TC eye fix problem works by ...

Ka Yan Wong; Chi Lap Yip

2005-09-01T23:59:59.000Z

157

A Tropical Cyclone Genesis Parameter for the Tropical Atlantic  

Science Conference Proceedings (OSTI)

A parameter to evaluate the potential for tropical cyclone formation (genesis) in the North Atlantic between Africa and the Caribbean islands is developed. Climatologically, this region is the source of about 40% of the Atlantic basin tropical ...

Mark DeMaria; John A. Knaff; Bernadette H. Connell

2001-04-01T23:59:59.000Z

158

Rapid Development of the Tropical Cyclone Warm Core  

Science Conference Proceedings (OSTI)

This paper presents a simple theoretical argument to isolate the conditions under which a tropical cyclone can rapidly develop a warm-core thermal structure and subsequently approach a steady state. The theoretical argument is based on the ...

Jonathan L. Vigh; Wayne H. Schubert

2009-11-01T23:59:59.000Z

159

A Comparison of Two Tropical Cyclone Bogussing Schemes  

Science Conference Proceedings (OSTI)

The impact of two bogussing schemes on tropical cyclone (TC) forecasts is compared. One scheme for bogussing TCs into the initial conditions of the nonhydrostatic version of the fifth-generation Pennsylvania State University–National Center for ...

Dongliang Wang; Xudong Liang; Ying Zhao; Bin Wang

2008-02-01T23:59:59.000Z

160

Experimental Dynamical Seasonal Forecasts of Tropical Cyclone Activity at IRI  

Science Conference Proceedings (OSTI)

The International Research Institute for Climate and Society (IRI) has been issuing experimental seasonal tropical cyclone activity forecasts for several ocean basins since early 2003. In this paper the method used to obtain these forecasts is ...

Suzana J. Camargo; Anthony G. Barnston

2009-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Effects of Vertical Wind Shear on Tropical Cyclone Precipitation  

Science Conference Proceedings (OSTI)

The response of the precipitation field for tropical cyclones in relation to the surrounding environmental vertical wind shear has been investigated using 20 000 snapshots of passive-microwave satellite rain rates. Composites of mean rain rates, ...

Matthew T. Wingo; Daniel J. Cecil

2010-03-01T23:59:59.000Z

162

Tropical cyclone preparedness and response : opportunities for operations research  

E-Print Network (OSTI)

This thesis explores how operations research methods can be applied in the emergency response community by looking at two recent tropical storm disasters; tropical cyclone Yemyin in Pakistan, June 2007 and super typhoon ...

Murphy, Maurice D

2008-01-01T23:59:59.000Z

163

Seasonal versus permanent thermocline warming by tropical cyclones  

E-Print Network (OSTI)

Recent studies suggest that the enhanced upper ocean mixing caused by tropical cyclones significantly contributes to the ocean heat transport. However, existing studies that try to quantify this contribution make the ...

Ferrari, Raffaele

164

Classifying North Atlantic Tropical Cyclone Tracks by Mass Moments*  

E-Print Network (OSTI)

A new method for classifying tropical cyclones or similar features is introduced. The cyclone track is considered as an open spatial curve, with the wind speed or power information along the curve considered to be a mass attribute. The first and second moments of the resulting object are computed and then used to classify the historical tracks using standard clustering algorithms. Mass moments allow the whole track shape, length, and location to be incorporated into the clustering methodology. Tropical cyclones in the North Atlantic basin are clustered with K-means by mass moments, producing an optimum of six clusters with differing genesis locations, track shapes, intensities, life spans, landfalls, seasonal patterns, and trends. Even variables that are not directly clustered show distinct separation between clusters. A trend analysis confirms recent conclusions of increasing tropical cyclones in the basin over the past two decades. However, the trends vary across clusters. 1.

Yochanan Kushnir; Suzana; J. Camargo

2008-01-01T23:59:59.000Z

165

The effects of ocean eddies on tropical cyclones  

E-Print Network (OSTI)

The purpose of this study is to understand the interactions of tropical cyclones with ocean eddies. In particular we examine the influence of a cold-core eddy on the cold wake formed during the passage of Typhoon Fanapi ...

Miltenberger, Alexander Reid

2012-01-01T23:59:59.000Z

166

An elastic contour matching model for tropical cyclone pattern recognition  

Science Conference Proceedings (OSTI)

In this paper, an elastic graph dynamic link model (EGDLM) based on elastic contour matching is proposed to automate the Dvorak technique for tropical cyclone (TC) pattern interpretation from satellite images. This method integrates traditional dynamic ...

R. S.T. Lee; J. N.K. Lin

2001-06-01T23:59:59.000Z

167

Impact of Duration Thresholds on Atlantic Tropical Cyclone Counts  

Science Conference Proceedings (OSTI)

Records of Atlantic basin tropical cyclones (TCs) since the late nineteenth century indicate a very large upward trend in storm frequency. This increase in documented TCs has been previously interpreted as resulting from anthropogenic climate ...

Christopher W. Landsea; Gabriel A. Vecchi; Lennart Bengtsson; Thomas R. Knutson

2010-05-01T23:59:59.000Z

168

Experiments with a Simple Tropical Cyclone Intensity Consensus  

Science Conference Proceedings (OSTI)

Consensus forecasts (forecasts created by combining output from individual forecasts) have become an integral part of operational tropical cyclone track forecasting. Consensus aids, which generally have lower average errors than individual models,...

Charles R. Sampson; James L. Franklin; John A. Knaff; Mark DeMaria

2008-04-01T23:59:59.000Z

169

Sensitivity of Tropical Cyclone Forecasts as Revealed by Singular Vectors  

Science Conference Proceedings (OSTI)

Singular vector (SV) sensitivity, calculated using the adjoint model of the U.S. Navy Operation Global Atmosphere Prediction System (NOGAPS), is used to study the dynamics associated with tropical cyclone evolution. For each model-predicted ...

Melinda S. Peng; Carolyn A. Reynolds

2006-10-01T23:59:59.000Z

170

On the Height of the Warm Core in Tropical Cyclones  

Science Conference Proceedings (OSTI)

The warm-core structure of tropical cyclones is examined in idealized simulations using the Weather Research and Forecasting (WRF) Model. The maximum perturbation temperature in a control simulation occurs in the midtroposphere (5–6 km), in ...

Daniel P. Stern; David S. Nolan

2012-05-01T23:59:59.000Z

171

Climatological Variations in North Atlantic Tropical Cyclone Tracks  

Science Conference Proceedings (OSTI)

This study investigates the relationship between tropical cyclone (TC) tracks and climatological variations in large-scale environmental parameters associated with the TC steering flow. By using the Atlantic Ocean hurricane database for 1950–2010, ...

Angela J. Colbert; Brian J. Soden

2012-01-01T23:59:59.000Z

172

The Response of Quasigeostrophic Oceanic Vortices to Tropical Cyclone Forcing  

Science Conference Proceedings (OSTI)

The response of quasigeostrophic (QG) oceanic vortices to tropical cyclone (TC) forcing is investigated using an isopycnic ocean model. Idealized oceanic currents and wind fields derived from observational data acquired during Hurricane Katrina ...

Benjamin Jaimes; Lynn K. Shay; George R. Halliwell

2011-10-01T23:59:59.000Z

173

An Analysis of the Biases in Traditional Cyclone Frequency Maps  

Science Conference Proceedings (OSTI)

The traditional method of estimating cyclone frequency by counting the number of storms passing through latitude-longitude grid cells is known to be biased because it effectively overweights the lower latitudes. Here we show that it is also ...

Karl E. Taylor

1986-08-01T23:59:59.000Z

174

Cyclone Occurrence Mapping: Equal Area or Raw Frequencies?  

Science Conference Proceedings (OSTI)

Meteorological data extracted from maps and charts is frequently normalized for area because grid cell size changes with latitude. Raw and area-normalized cyclone frequency data were compared. Area normalization deforms mean frequency patterns. ...

Bruce P. Hayden

1981-01-01T23:59:59.000Z

175

A Comprehensive Test of the Navy Nested Tropical Cyclone Model  

Science Conference Proceedings (OSTI)

The tropical cyclone forecasting skill level of the Joint Typhoon Warning Center (JTWC) has reached a plateau and has shown little or no lasting improvement during the last 10 years. Because JTWC relies on an array of statistical and ...

Edward J. Harrison Jr.; Michael Fiorino

1982-07-01T23:59:59.000Z

176

Quantifying Environmental Control on Tropical Cyclone Intensity Change  

Science Conference Proceedings (OSTI)

Composite analysis is used to examine environmental and climatology and persistence characteristics of tropical cyclones (TCs) undergoing different intensity changes in the western North Pacific (WPAC) and North Atlantic (ATL) ocean basins. Using ...

Eric A. Hendricks; Melinda S. Peng; Bing Fu; Tim Li

2010-08-01T23:59:59.000Z

177

Effects of Environmental Flow upon Tropical Cyclone Structure  

Science Conference Proceedings (OSTI)

Numerical simulations of tropical-cyclone-like vortices are performed to analyze the effects of unidirectional vertical wind shear and translational flow upon the organization of convection within a hurricane’s core region and upon the intensity ...

William M. Frank; Elizabeth A. Ritchie

1999-09-01T23:59:59.000Z

178

Wind Profiles in Tropical Cyclone Stratiform Rainbands over Land  

Science Conference Proceedings (OSTI)

Observations of 14 stratiform periods in outer tropical cyclone rainbands are used to evaluate wind structure using a velocity–azimuth display (VAD) technique applied to KAMX (Miami) Weather Surveillance Radar-1988 Doppler (WSR-88D) data. These 14 ...

Shaunna L. Donaher; Bruce A. Albrecht; Ming Fang; William Brown

2013-11-01T23:59:59.000Z

179

Impacts of Atmospheric Temperature Trends on Tropical Cyclone Activity  

Science Conference Proceedings (OSTI)

Impacts of tropical temperature changes in the upper troposphere (UT) and the tropical tropopause layer (TTL) on tropical cyclone (TC) activity are explored. UT and lower TTL cooling both lead to an overall increase in potential intensity (PI), ...

Gabriel A. Vecchi; Stephan Fueglistaler; Isaac M. Held; Thomas R. Knutson; Ming Zhao

2013-06-01T23:59:59.000Z

180

The Track Integrated Kinetic Energy of Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

In this paper the concept of track integrated kinetic energy (TIKE) is introduced as a measure of seasonal Atlantic tropical cyclone activity and applied to seasonal variability in the Atlantic. It is similar in concept to the more commonly used ...

V. Misra; S. DiNapoli; M. Powell

2013-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Simulations of Subtropical Cyclones in a Baroclinic Channel Model  

Science Conference Proceedings (OSTI)

The present study considers a variety of cyclone developments that occur in an idealized, baroclinic channel model featuring full condensation heating effects over an ocean with prescribed sea surface temperature variation. The geostrophic basic-...

Christopher A. Davis

2010-09-01T23:59:59.000Z

182

Predicting Atlantic Basin Seasonal Tropical Cyclone Activity by 1 June  

Science Conference Proceedings (OSTI)

This is the third in a series of papers describing the potential for the seasonal forecasting of Atlantic basin tropical cyclone activity. Earlier papers by the authors describe seasonal prediction from 1 December of the previous year and from 1 ...

William M. Gray; Christopher W. Landsea; Paul W. Mielke Jr.; Kenneth J. Berry

1994-03-01T23:59:59.000Z

183

Improving Tropical Cyclone Intensity Guidance in the Eastern North Pacific  

Science Conference Proceedings (OSTI)

The primary objective of this research is the development of a statistical model that will provide tropical cyclone (TC) intensity guidance for the eastern North Pacific (ENP) superior to that provided by climatology and persistence models. ...

Kevin R. Petty; Jay S. Hobgood

2000-04-01T23:59:59.000Z

184

An Error Analysis of Atlantic Tropical Cyclone Track Guidance Models  

Science Conference Proceedings (OSTI)

Mean track forecast errors over the 6-yr period 1983–88 are compared for four tropical cyclone-track forecast models in use at the National Hurricane Center (NHC). The model types represented are statistical, statistical-dynamical, barctropic-...

Mark Demaria; Miles B. Lawrence; James T. Kroll

1990-03-01T23:59:59.000Z

185

Interpretation of Adaptive Observing Guidance for Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

Adaptive observing guidance products for Atlantic tropical cyclones are compared using composite techniques that allow one to quantitatively examine differences in the spatial structures of the guidance maps and relate these differences to the ...

C. A. Reynolds; M. S. Peng; S. J. Majumdar; S. D. Aberson; C. H. Bishop; R. Buizza

2007-12-01T23:59:59.000Z

186

Reexamination of Tropical Cyclone Wind–Pressure Relationships  

Science Conference Proceedings (OSTI)

Tropical cyclone wind–pressure relationships are reexamined using 15 yr of minimum sea level pressure estimates, numerical analysis fields, and best-track intensities. Minimum sea level pressure is estimated from aircraft reconnaissance or ...

John A. Knaff; Raymond M. Zehr

2007-02-01T23:59:59.000Z

187

A New Assessment of the Predictability of Tropical Cyclone Tracks  

Science Conference Proceedings (OSTI)

The inherent predictability of tropical cyclone tracks has received much attention since the 1980s. It is still an issue because of the recent improvement of track forecasts by numerical models. The aim of this study is to assess this ...

Matthieu Plu

2011-11-01T23:59:59.000Z

188

A New Parametric Tropical Cyclone Tangential Wind Profile Model  

Science Conference Proceedings (OSTI)

A new parametric tropical cyclone (TC) wind profile model is presented for depicting representative surface pressure profiles corresponding to multiple-maxima wind profiles that exhibit single-, dual-, and triple-maximum concentric-eyewall wind ...

Vincent T. Wood; Luther W. White; Hugh E. Willoughby; David P. Jorgensen

2013-06-01T23:59:59.000Z

189

On the Statistical Analysis of Cyclone Deepening Rates  

Science Conference Proceedings (OSTI)

Statistical analysis of cyclone deepening rates has been used in the past to infer distinctions between physical processes operative in cases of explosive cyclogenesis and lesser storms. This note attempts to qualify the conclusions of the ...

Paul J. Roebber

1989-10-01T23:59:59.000Z

190

A Bayesian Forecast Model of Australian Region Tropical Cyclone Formation  

Science Conference Proceedings (OSTI)

A new and potentially skillful seasonal forecast model of tropical cyclone formation [tropical cyclogenesis (TCG)] is developed for the Australian region. The model is based on Poisson regression using the Bayesian approach. Predictor combinations ...

Angelika Werner; Neil J. Holbrook

2011-12-01T23:59:59.000Z

191

On the Squall Lines Preceding Landfalling Tropical Cyclones in China  

Science Conference Proceedings (OSTI)

Based on a 3-yr (2007–09) mosaic of radar reflectivity and conventional surface and synoptic radiosonde observations, the general features of squall lines preceding landfalling tropical cyclones (TCs) (pre-TC) in China are examined and compared ...

Zhiyong Meng; Yunji Zhang

2012-02-01T23:59:59.000Z

192

Tropical Cyclone Damages in China 1983–2006  

Science Conference Proceedings (OSTI)

Based on damage records released by the Department of Civil Affairs of China, direct economic losses and casualties associated with tropical cyclones that made landfall over China during 1983–2006 are examined. In an average year, landfalling ...

Qiang Zhang; Qiufeng Liu; Liguang Wu

2009-04-01T23:59:59.000Z

193

An Overview of the China Meteorological Administration Tropical Cyclone Database  

Science Conference Proceedings (OSTI)

The China Meteorological Administration’s tropical cyclone (TC) database includes not only the best track dataset, but also TC-induced wind and precipitation data. This article summarizes the characteristics and key technical details of the CMA TC ...

Ming Ying; Wei Zhang; Hui Yu; Xiaoqin Lu; Jingxian Feng; Yongxiang Fan; Yongti Zhu; Dequan Chen

194

Some Aspects of Vortex Structure Related to Tropical Cyclone Motion  

Science Conference Proceedings (OSTI)

Some effect of tropical cyclone structure on the vortex motion are examined in a nondivergent, barotropic numerical model with no basic current. As suggested earlier by DeMaria, the initial maximum wind speed has little effect on the track. ...

Michael Fiorino; Russell L. Elsberry

1989-04-01T23:59:59.000Z

195

Dynamics and Boundary Layer Processes in Two Asian Cyclones  

Science Conference Proceedings (OSTI)

An explosive and nonexplosive cyclone that developed during March 1986 along the coast of Japan are analyzed to illustrate the possible interaction of moist baroclinic dynamics, boundary layer structure and surface heat and moisture fluxes in ...

Wendell A. Nuss; Shun I. Kamikawa

1990-03-01T23:59:59.000Z

196

A Highly Configurable Vortex Initialization Method for Tropical Cyclones  

Science Conference Proceedings (OSTI)

A highly configurable vortex initialization methodology has been constructed in order to permit manipulation of the initial vortex structure in numerical models of tropical cyclones. By using distinct specifications of the flow in the boundary ...

Eric D. Rappin; David S. Nolan; Sharanya J. Majumdar

2013-10-01T23:59:59.000Z

197

An Adaptive Multigrid Barotropic Tropical Cyclone Track Model  

Science Conference Proceedings (OSTI)

This paper describes the application of adaptive multigrid techniques to the problem of tropical cyclone track prediction. Based on the nondivergent barotropic vorticity equation, the model uses an adaptive multigrid method to refine the mesh ...

Scott R. Fulton

2001-01-01T23:59:59.000Z

198

Prediction of Consensus Tropical Cyclone Track Forecast Error  

Science Conference Proceedings (OSTI)

The extent to which the tropical cyclone (TC) track forecast error of a consensus model (CONU) routinely used by the forecasters at the National Hurricane Center can be predicted is determined. A number of predictors of consensus forecast error, ...

James S. Goerss

2007-05-01T23:59:59.000Z

199

Influence of Environmental Humidity on Tropical Cyclone Size  

Science Conference Proceedings (OSTI)

Observations demonstrate that the radius of maximum winds in tropical cyclones (TCs) can vary by an order of magnitude; similar size differences are evident in other spatial measures of the wind field as well as in cloud and precipitation fields. ...

Kevin A. Hill; Gary M. Lackmann

2009-10-01T23:59:59.000Z

200

Tropical Cyclone Motion: Environmental Interaction Plus a Beta Effect  

Science Conference Proceedings (OSTI)

The dynamics of tropical cyclone motion are investigated by solving for instantaneous motion tendencies using the divergent barotropic vorticity equation on a beta plane. Two methods of solution are presented a direct analytic solution for a ...

Greg J. Holland

1983-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Evaluation of multiple dynamic initialization schemes for tropical cyclone prediction  

Science Conference Proceedings (OSTI)

Three different dynamic initialization schemes for tropical cyclone (TC) prediction in numerical prediction systems are described and evaluated. The first scheme involves the removal of the analyzed vortex, followed by insertion of a dynamically-...

Eric A. Hendricks; Melinda S. Peng; Tim Li

202

A Highly Configurable Vortex Initialization Method for Tropical Cyclones  

Science Conference Proceedings (OSTI)

A highly configurable vortex initialization methodology has been constructed in order to permit manipulation of the initial vortex structure in numerical models of tropical cyclones. By using distinct specifications of the flow in the boundary ...

Eric D. Rappin; David S. Nolan; Sharanya J. Majumdar

203

Uncertainty of Tropical Cyclone Best-Track Information  

Science Conference Proceedings (OSTI)

With the growing use of tropical cyclone (TC) best-track information for weather and climate applications, it is important to understand the uncertainties that are contained in the TC position and intensity information. Here, an attempt is made to ...

Ryan D. Torn; Chris Snyder

2012-06-01T23:59:59.000Z

204

On the Net Cyclonic Circulation in Large Stratified Lakes  

Science Conference Proceedings (OSTI)

This paper proposes a possible explanation for the mean cyclonic circulation in large stratified lakes The condition of no heat flux through the bottom boundary causes the isotherms to dip near the shores to intersect the sloping bottom ...

David J. Schwab; William P. O'Connor; George L. Mellor

1995-06-01T23:59:59.000Z

205

Tropical cyclone tracking using a neighbor enclosed area tracking algorithm  

Science Conference Proceedings (OSTI)

Tropical cyclone (TC) tracking is essential for calculating TC statistics from gridded datasets. A new method for TC tracking is presented here using neighbor enclosed area tracking (NEAT), which is based on the temporal overlap of enclosed areas ...

Yuya Satake; Masaru Inatsu; Masato Mori; Akira Hasegawa

206

Evaluation of a Cyclone and Hot Gas Filter System  

NLE Websites -- All DOE Office Websites (Extended Search)

a Cyclone and a Cyclone and Hot Gas Filter System Description The Wabash River Coal Gasification Plant uses an oxygen-blown E-Gas gasifier technology, owned by ConocoPhillips, which produces fuel gas containing significant amounts of fine particulates. Currently, particulates are cleaned from the fuel gas with metal candle filters. These filters require two costly plant shut-downs per year for cleaning or replacement. During the U.S Department of Energy-supported project

207

Cyclone–Anticyclone Couplets over North America. Part II: Analysis of a Major Cyclone Event over the Eastern United States  

Science Conference Proceedings (OSTI)

The evolution of a major cyclone over Eastern North America in March 1971 is described. A noteworthy feature of the development, in addition to the extreme baroclinity, was the substantial thermal advection upward from the middle troposphere to ...

James S. Boyle; Lance F. Bosart

1986-12-01T23:59:59.000Z

208

The Life Cycle of an Extratropical Marine Cyclone. Part I: Frontal-Cyclone Evolution and Thermodynamic Air-Sea Interaction  

Science Conference Proceedings (OSTI)

The Experiment on Rapidly Intensifying Cyclones over the Atlantic was carried out over the western North Atlantic Ocean to provide temporally continuous comprehensive datasets from which to document the life cycle of extratropical marine ...

Paul J. Neiman; M. A. Shapiro

1993-08-01T23:59:59.000Z

209

Quantifying tropical cyclone cloud cover using Envisat retrievals – an example of a recent severe tropical cyclone, ‘Thane’  

Science Conference Proceedings (OSTI)

The eastern coast of peninsular India routinely receives the onslaught of devastating cyclonic storms. We suggest a novel method involving Envisat retrievals followed by application of the European Space Agency's ESA's Earth Observation Link Stand-Alone ...

Ishan Saini, Pranav Chandramouli, Arkayan Samaddar, Satyajit Ghosh

2013-07-01T23:59:59.000Z

210

Models of Tropical Cyclone Wind Distribution and Beta-Effect Propagation for Application to Tropical Cyclone Track Forecasting  

Science Conference Proceedings (OSTI)

A model of the tangential wind speed in the outer regions of tropical cyclones is proposed based on approximate conservation of angular momentum. The purpose is to derive an operationally useful model of the beta-effect propagation (BEP), which ...

Lester E. Carr III; Russell L. Elsberry

1997-12-01T23:59:59.000Z

211

Tropical cyclone size in observations and in radiative-convective equilibrium  

E-Print Network (OSTI)

Tropical cyclone size remains an unsolved problem in tropical meteorology, yet size plays a significant role in the damage caused by tropical cyclones due to wind, storm surge, and inland freshwater flooding. This work ...

Chavas, Daniel Robert

2013-01-01T23:59:59.000Z

212

Australian Heavy-Rain Days and Associated East Coast Cyclones: 1958–92  

Science Conference Proceedings (OSTI)

The authors present a comprehensive climatology of heavy rain and east coast cyclones from January 1958 to September 1992. A total of 80 cyclones, including nondeveloping systems, were objectively identified from daily rainfall and surface wind ...

Linda C. Hopkins; Greg J. Holland

1997-04-01T23:59:59.000Z

213

Effects of the Upper Flow Asymmetry on the Future Direction of Motion of Tropical Cyclones  

Science Conference Proceedings (OSTI)

Analyses of 200-mb streamlines indicate the existence of a confluence between a tropical cyclone’s main anticyclonic outflow channel aloft and the large-wale environmental upper flow. The confluence produces in the poleward semicircle a ...

F. A. Lajoie

1986-10-01T23:59:59.000Z

214

The Influence of Airborne Doppler Radar Data Quality on Numerical Simulations of a Tropical Cyclone  

Science Conference Proceedings (OSTI)

The impact of airborne Doppler radar data assimilation on improving numerical simulations of tropical cyclones (TCs) has been well recognized. However, the influence of radar data quality on the numerical simulation of tropical cyclones has not ...

Lei Zhang; Zhaoxia Pu; Wen-Chau Lee; Qingyun Zhao

2012-02-01T23:59:59.000Z

215

Characteristics of Landfalling Tropical Cyclones in the United States and Mexico: Climatology and Interannual Variability  

Science Conference Proceedings (OSTI)

The climatology and interannual variability of landfalling tropical cyclones and their impacts on precipitation in the continental United States and Mexico are examined. The analysis is based on National Hurricane Center 6-hourly tropical cyclone ...

Joshua Larson; Yaping Zhou; R. Wayne Higgins

2005-04-01T23:59:59.000Z

216

Objective Guidance for Use in Setting Tropical Cyclone Conditions of Readiness  

Science Conference Proceedings (OSTI)

The Department of Defense uses a Tropical Cyclone Conditions of Readiness (TC-CORs) system to prepare bases and evacuate assets and personnel in advance of adverse weather associated with tropical cyclones (TCs). TC-CORs are recommended by weather ...

Charles R. Sampson; Andrea B. Schumacher; John A. Knaff; Mark DeMaria; Edward M. Fukada; Chris A. Sisko; David P. Roberts; Katherine A. Winters; Harold M. Wilson

2012-08-01T23:59:59.000Z

217

Composite Analysis of Winter Cyclones in a GCM: Influence on Climatological Humidity  

Science Conference Proceedings (OSTI)

The role of midlatitude baroclinic cyclones in maintaining the extratropical winter distribution of water vapor in an operational global climate model is investigated. A cyclone identification and tracking algorithm is used to compare the ...

Mike Bauer; Anthony D. Del Genio

2006-05-01T23:59:59.000Z

218

Australian East-Coast Cyclones. Part I: Synoptic Overview and Case Study  

Science Conference Proceedings (OSTI)

The meteorological conditions for the development of Australian east-coast cyclones are described. The main synoptic precursor is a trough (or “dip”) in the easterly wind regime over eastern Australia. The cyclones are a mesoscale development ...

Greg J. Holland; Amanda H. Lynch; Lance M. Leslie

1987-12-01T23:59:59.000Z

219

A Modified Approach to Initialize an Idealized Extratropical Cyclone within a Mesoscale Model  

Science Conference Proceedings (OSTI)

A technique for initializing realistic idealized extratropical cyclones for short-term (0–72 h) numerical simulations is described. The approach modifies select methods from two previous studies to provide more control over the initial cyclone ...

Joseph B. Olson; Brian A. Colle

2007-04-01T23:59:59.000Z

220

A Cyclone Phase Space Derived from Thermal Wind and Thermal Asymmetry  

Science Conference Proceedings (OSTI)

An objectively defined three-dimensional cyclone phase space is proposed and explored. Cyclone phase is described using the parameters of storm-motion-relative thickness asymmetry (symmetric/nonfrontal versus asymmetric/frontal) and vertical ...

Robert E. Hart

2003-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Parameter spaces of environmental fields responsible for cyclone development from tropics to extratropics  

Science Conference Proceedings (OSTI)

Objective cyclone tracking applied to a 30-year reanalysis dataset shows that cyclone development in the summer and autumn seasons is active in the tropics and extratropics and inactive in the subtropics. To understand this geographically bimodal ...

Wataru Yanase; Hiroshi Niino; Kevin Hodges; Naoko Kitabatake

222

Formation and Quasi-Periodic Behavior of Outer Spiral Rainbands in a Numerically Simulated Tropical Cyclone  

Science Conference Proceedings (OSTI)

The formation and quasi-periodic behavior of outer spiral rainbands in a tropical cyclone simulated in the cloud-resolving tropical cyclone model version 4 (TCM4) are analyzed. The outer spiral rainbands in the simulation are preferably initiated ...

Qingqing Li; Yuqing Wang

2012-03-01T23:59:59.000Z

223

A Technique for Detecting a Tropical Cyclone Center Using a Doppler Radar  

Science Conference Proceedings (OSTI)

A ground-based Doppler radar technique is developed for detecting a tropical cyclone center position. Accurate determination of the cyclone center position, based on Doppler velocity measurements, will become essential for the issuance of ...

Vincent T. Wood

1994-10-01T23:59:59.000Z

224

Assimilation of Tropical Cyclone Track and Structure Based on the Ensemble Kalman Filter (EnKF)  

Science Conference Proceedings (OSTI)

A new tropical cyclone vortex initialization method based on the ensemble Kalman filter (EnKF) is proposed in this study. Three observed parameters that are related to the tropical cyclone (TC) track and structure—center position, velocity of ...

Chun-Chieh Wu; Guo-Yuan Lien; Jan-Huey Chen; Fuqing Zhang

2010-12-01T23:59:59.000Z

225

Application of Airborne Passive Microwave Observations for Monitoring Inland Flooding Caused by Tropical Cyclones  

Science Conference Proceedings (OSTI)

Inland flooding from tropical cyclones is a significant factor in storm-related deaths in the United States and other countries, with the majority of tropical cyclone fatalities recorded in the United States resulting from freshwater flooding. ...

Courtney D. Buckley; Robbie E. Hood; Frank J. LaFontaine

2009-10-01T23:59:59.000Z

226

Projection of Tropical Cyclones on Wavenumber–Frequency-Filtered Equatorial Waves  

Science Conference Proceedings (OSTI)

The impact of localized convection associated with tropical cyclones (TCs) on activity ascribed to equatorial waves is estimated. An algorithm is used to remove outgoing longwave radiation (OLR) signal in the vicinity of observed tropical cyclones,...

Anantha Aiyyer; Ademe Mekonnen; Carl J. Schreck III

2012-05-01T23:59:59.000Z

227

Evaluation of Wave Forecasts Consistent with Tropical Cyclone Warning Center Wind Forecasts  

Science Conference Proceedings (OSTI)

An algorithm to generate wave fields consistent with forecasts from the official U.S. tropical cyclone forecast centers has been made available in near–real time to forecasters since summer 2007. The algorithm removes the tropical cyclone from ...

Charles R. Sampson; Paul A. Wittmann; Efren A. Serra; Hendrik L. Tolman; Jessica Schauer; Timothy Marchok

2013-02-01T23:59:59.000Z

228

The Dynamics of an Explosively Developing Cyclone Simulated by a General Circulation Model  

Science Conference Proceedings (OSTI)

The synoptic structure and dynamics of an explosively developing winter extratropical cyclone simulated by NCAR’s CCM2 general circulation model is examined and compared with cyclones that have developed explosively in nature. The primary ...

Karen D. Walthorn; Phillip J. Smith

1998-11-01T23:59:59.000Z

229

Modeling Return Periods of Tropical Cyclone Intensities in the Vicinity of Hawaii  

Science Conference Proceedings (OSTI)

Tropical cyclones in the vicinity of Hawaii have resulted in great property damage. An estimate of the return periods of tropical cyclone intensities is of particular interest to governments, public interest groups, and private sectors.

Pao-Shin Chu; Jianxin Wang

1998-09-01T23:59:59.000Z

230

Tropical Cyclone Intensity Change before U.S. Gulf Coast Landfall  

Science Conference Proceedings (OSTI)

Tropical cyclone intensity change remains a forecasting challenge with important implications for such vulnerable areas as the U.S. coast along the Gulf of Mexico. Analysis of 1979–2008 Gulf tropical cyclones during their final two days before ...

Edward N. Rappaport; James L. Franklin; Andrea B. Schumacher; Mark DeMaria; Lynn K. Shay; Ethan J. Gibney

2010-10-01T23:59:59.000Z

231

Comparing cyclone life cycle characteristics and their interannual variability in different reanalyses  

Science Conference Proceedings (OSTI)

Characteristics of Northern Hemisphere extratropical cyclone activity were compared for five concurrent reanalyses (NCEP-DOE, JRA-25, ERA-Interim, MERRA and NCEP-CFSR) for the period 1979-2010 using a single cyclone tracking algorithm. The total ...

Natalia Tilinina; Sergey K. Gulev; Irina Rudeva; Peter Koltermann

232

Quantifying Surface Energy Fluxes in the Vicinity of Inland-Tracking Tropical Cyclones  

Science Conference Proceedings (OSTI)

Tropical cyclones (TCs) typically weaken or transition to extratropical cyclones after making landfall. However, there are cases of TCs maintaining warm-core structures and intensifying inland unexpectedly, referred to as TC maintenance or ...

Theresa K. Andersen; David E. Radcliffe; J. Marshall Shepherd

233

The Life Cycle of an Extratropical Marine Cyclone. Part II: Mesoscale Structure and Diagnostics  

Science Conference Proceedings (OSTI)

This is the second of two articles describing the evolving structure and selected physical processes within an intense extratropical marine cyclone observed during the Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA) field ...

Paul J. Neiman; M. A. Shapiro; L. S. Fedor

1993-08-01T23:59:59.000Z

234

The Impact of Ice Phase Cloud Parameterizations on Tropical Cyclone Prediction  

Science Conference Proceedings (OSTI)

The impact of ice phase cloud microphysical processes on prediction of tropical cyclone environment is examined for two microphysical parameterizations using the Coupled Ocean / Atmosphere Mesoscale Prediction System –Tropical Cyclone model. An ...

Yi Jin; Shouping Wang; Jason Nachamkin; James D. Doyle; Gregory Thompson; Louis Grasso; Teddy Holt; Jon Moskaitis; Hao Jin; Richard M. Hodur; Qingyun Zhao; Ming Liu; Mark DeMaria

235

Propagation of a Tropical Cyclone in a Meridionally Varying Zonal Flow: An Energetics Analysis  

Science Conference Proceedings (OSTI)

Tropical cyclone propagation (the beta drift) is driven by a secondary circulation associated with axially asymmetric gyres (beta gyres) in the vicinity of the cyclone center. In the presence of the beta effect, the environmental flow may ...

Bin Wang; Xiaofan Li

1995-05-01T23:59:59.000Z

236

Sensitivity of Tropical Cyclone Intensity to Ventilation in an Axisymmetric Model  

E-Print Network (OSTI)

The sensitivity of tropical cyclone intensity to ventilation of cooler, drier air into the inner core is examined using an axisymmetric tropical cyclone model with parameterized ventilation. Sufficiently strong ventilation ...

Tang, Brian

237

Analysis of north atlantic tropical cyclone intensify change using data mining  

Science Conference Proceedings (OSTI)

Tropical cyclones (TC), especially when their intensity reaches hurricane scale, can become a costly natural hazard. Accurate prediction of tropical cyclone intensity is very difficult because of inadequate observations on TC structures, poor ...

Jiang Tang / Ruixin Yang

2010-01-01T23:59:59.000Z

238

Mining geophysical parameters through decision-tree analysis to determine correlation with tropical cyclone development  

Science Conference Proceedings (OSTI)

Correlations between geophysical parameters and tropical cyclones are essential in understanding and predicting the formation of tropical cyclones. Previous studies show that sea surface temperature and vertical wind shear significantly influence the ... Keywords: Data mining, Hurricane, Natural disaster, Prediction

Wenwen Li; Chaowei Yang; Donglian Sun

2009-02-01T23:59:59.000Z

239

A Composite Study of the Interactions between Tropical Cyclones and Upper-Tropospheric Troughs  

Science Conference Proceedings (OSTI)

The objective of this study is to understand how interactions with upper-tropospheric troughs affect the intensity of tropical cyclones. The study includes all named Atlantic tropical cyclones between 1985 and 1996. To minimize other factors ...

Deborah Hanley; John Molinari; Daniel Keyser

2001-10-01T23:59:59.000Z

240

A Southwest Pacific Tropical Cyclone Climatology and Linkages to the El Niño–Southern Oscillation  

Science Conference Proceedings (OSTI)

The new South Pacific Enhanced Archive for Tropical Cyclones (SPEArTC) dataset provides an opportunity to develop a more complete climatology of tropical cyclones (TCs) in the southwest Pacific. Here, spatial patterns and characteristics of TCs ...

Howard J. Diamond; Andrew M. Lorrey; James A. Renwick

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

A Composite Diagnosis of Synoptic-Scale Extratropical Cyclone Development over the United States  

Science Conference Proceedings (OSTI)

This paper presents a composite diagnosis of synoptic-scale forcing mechanisms associated with extratropical cyclone evolution. Drawn from 12 cyclone cases that occurred over the continental United States during the cool season months, the ...

Donald M. Rolfson; Phillip J. Smith

1996-06-01T23:59:59.000Z

242

The Frontal Structure of an Explosive Oceanic Cyclone: Airbone Radar Observations of ERICA IOP 4  

Science Conference Proceedings (OSTI)

Observation taken during the Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA) have permitted analyses of explosive oceanic cyclogenesis of unprecedented detail. The most intense of the cyclones that occurred during this ...

Roger M. Wakimoto; Warren Blier; Chinghwang Liu

1992-07-01T23:59:59.000Z

243

A Diagnosis of a Model-Simulated Explosively Developing Extratropical Cyclone  

Science Conference Proceedings (OSTI)

This paper examines a simulation of the explosive development phase of the ERICA IOP 4 extratropical cyclone case obtained from the 70-km Limited Area Mesoscale Prediction System. A detailed diagnosis of the simulated cyclone is performed using ...

Robert L. M. Rausch; Phillip J. Smith

1996-05-01T23:59:59.000Z

244

Size Changes over the Life of Sea Level Cyclones in the NCEP Reanalysis  

Science Conference Proceedings (OSTI)

This paper addresses the extent to which sea level pressure cyclones change size as they develop. A state-of-the-art cyclone tracking scheme has been applied to the global “reanalyses” produced by the National Centers for Environmental Prediction ...

Ian Simmonds

2000-12-01T23:59:59.000Z

245

Projected Increases in North Atlantic Tropical Cyclone Intensity from CMIP5 Models  

Science Conference Proceedings (OSTI)

Tropical cyclones—particularly intense ones—are a hazard to life and property, so an assessment of the changes in North Atlantic tropical cyclone intensity has important socioeconomic implications. In this study, the authors focus on the ...

Gabriele Villarini; Gabriel A. Vecchi

2013-05-01T23:59:59.000Z

246

Tropical-Cyclone Forecasting: A Worldwide Summary of Techniques and Verification Statistics  

Science Conference Proceedings (OSTI)

Questionnaire replies from forecasters in 16 tropical-cyclone warming centers are summarized to provide an overview of the current state of the science in tropical-cyclone analysis and forecasting. Information is tabulated on the data sources and ...

John L. McBride; Greg J. Holland

1987-10-01T23:59:59.000Z

247

Observation-Based Estimates of Surface Cooling Inhibition by Heavy Rainfall under Tropical Cyclones  

Science Conference Proceedings (OSTI)

Tropical cyclones drive intense ocean vertical mixing that explains most of the surface cooling observed in their wake (the “cold wake”). In this paper, the authors investigate the influence of cyclonic rainfall on the cold wake at a global scale ...

Nicolas C. Jourdain; Matthieu Lengaigne; Jérome Vialard; Gurvan Madec; Christophe E. Menkes; Emmanuel M. Vincent; Swen Jullien; Bernard Barnier

2013-01-01T23:59:59.000Z

248

The Relationship between Satellite Measured Convective Bursts and Tropical Cyclone Intensification  

Science Conference Proceedings (OSTI)

The relationship between the mean temperature of the top of the cloud canopies and the future maximum winds of Atlantic Ocean tropical cyclones is analyzed. The area-average cloud top temperatures from 309 observations of 12 tropical cyclones ...

Joseph Steranka; Edward B. Rodgers; R. Cecil Gentry

1986-08-01T23:59:59.000Z

249

The Impact of Observational Technology on Climate Database Quality: Tropical Cyclones in the Tasman Sea  

Science Conference Proceedings (OSTI)

The recorded climatology of tropical cyclones that affect the Tasman Sea spans the period from 1911 to the present. This climatology is a subset of the much larger Australian Tropical Cyclone database, which is the official record of all tropical ...

Bruce W. Buckley; Lance M. Leslie; Milton S. Speer

2003-08-01T23:59:59.000Z

250

Synthetic Aperture Radar as a Tool for Investigating Polar Mesoscale Cyclones  

Science Conference Proceedings (OSTI)

Polar mesoscale cyclones are intense vortices that form in cold, marine air masses poleward of major jet streams and frontal zones. Synthetic aperture radar (SAR) should be considered as a potential tool for the study of polar mesoscale cyclones ...

Todd D. Sikora; Karen S. Friedman; William G. Pichel; Pablo Clemente-Colón

2000-12-01T23:59:59.000Z

251

Multiseason Lead Forecast of the North Atlantic Power Dissipation Index (PDI) and Accumulated Cyclone Energy (ACE)  

Science Conference Proceedings (OSTI)

By considering the intensity, duration, and frequency of tropical cyclones, the power dissipation index (PDI) and accumulated cyclone energy (ACE) are concise metrics routinely used to assess tropical storm activity. This study focuses on the ...

Gabriele Villarini; Gabriel A. Vecchi

2013-06-01T23:59:59.000Z

252

Sensitivity of Tropical Cyclone Intensity to Ventilation in an Axisymmetric Model  

Science Conference Proceedings (OSTI)

The sensitivity of tropical cyclone intensity to ventilation of cooler, drier air into the inner core is examined using an axisymmetric tropical cyclone model with parameterized ventilation. Sufficiently strong ventilation induces cooling of the ...

Brian Tang; Kerry Emanuel

2012-08-01T23:59:59.000Z

253

Modeling Seasonal Tropical Cyclone Activity in the Fiji Region as a Binary Classification Problem  

Science Conference Proceedings (OSTI)

This study presents a binary classification model for the prediction of tropical cyclone (TC) activity in the Fiji, Samoa, and Tonga regions (the FST region) using the accumulated cyclone energy (ACE) as a proxy of TC activity. A probit regression ...

Savin S. Chand; Kevin J. E. Walsh

2012-07-01T23:59:59.000Z

254

A Bayesian Regression Approach to Seasonal Prediction of Tropical Cyclones Affecting the Fiji Region  

Science Conference Proceedings (OSTI)

This study presents seasonal prediction schemes for tropical cyclones (TCs) affecting the Fiji, Samoa, and Tonga (FST) region. Two separate Bayesian regression models are developed: (i) for cyclones forming within the FST region (FORM) and (ii) ...

Savin S. Chand; Kevin J. E. Walsh; Johnny C. L. Chan

2010-07-01T23:59:59.000Z

255

Tropical Cyclone Track Characteristics as a Function of Large-Scale Circulation Anomalies  

Science Conference Proceedings (OSTI)

Factors that contribute to intraseasonal variability in western North Pacific tropical cyclone track types are investigated. It is hypothesized that the 700-mb large-scale circulation can affect tropical cyclone track characteristics by enhancing ...

Patrick A. Harr; Russell L. Elsberry

1991-06-01T23:59:59.000Z

256

How Do Outer Spiral Rainbands Affect Tropical Cyclone Structure and Intensity?  

Science Conference Proceedings (OSTI)

A long-standing issue on how outer spiral rainbands affect the structure and intensity of tropical cyclones is studied through a series of numerical experiments using the cloud-resolving tropical cyclone model TCM4. Because diabatic heating due ...

Yuqing Wang

2009-05-01T23:59:59.000Z

257

The Impact of the Appalachian Mountains on Cyclonic Weather Systems. Part I: A Climatology  

Science Conference Proceedings (OSTI)

A climatological study of cold fronts and cyclones crossing the Appalachian Mountains from the west through northwest has been performed. A sample size of 50 fronts and 40 cyclones was derived from the seven winter seasons (December through March)...

Christopher O'Handley; Lance F. Bosart

1996-07-01T23:59:59.000Z

258

Environmental Conditions Prior to Formation of a Midget Tropical Cyclone during TCM-93  

Science Conference Proceedings (OSTI)

During a 10-day period in the Tropical Cyclone Motion (TCM-93) field experiment over the tropical western North Pacific, tropical cyclone formation occurred in association with persistent deep convection that was observed over low-level, north-...

Patrick A. Harr; Michael S. Kalafsky; Russell L. Elsberry

1996-08-01T23:59:59.000Z

259

Mean Southern Hemisphere Extratropical Cyclone Behavior in the 40-Year NCEP–NCAR Reanalysis  

Science Conference Proceedings (OSTI)

This paper presents a new climatology of Southern Hemisphere (SH) extratropical cyclones. This has been compiled by applying a state-of-the-art cyclone tracking scheme to the 6-hourly National Centers for Environmental Prediction–National Center ...

Ian Simmonds; Kevin Keay

2000-03-01T23:59:59.000Z

260

Global Distribution of Hot Towers in Tropical Cyclones Based on 11-Yr TRMM Data  

Science Conference Proceedings (OSTI)

Global distribution of hot towers in tropical cyclones (TCs) is statistically quantified using an 11-yr Tropical Rainfall Measuring Mission (TRMM) Tropical Cyclone Precipitation Feature (TCPF) database. From 6003 individual TRMM overpasses of 869 ...

Cheng Tao; Haiyan Jiang

2013-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

How Does the Boundary Layer Contribute to Eyewall Replacement Cycles in Axisymmetric Tropical Cyclones?  

Science Conference Proceedings (OSTI)

Three diagnostic models of the axisymmetric tropical cyclone boundary layer, with different levels of approximation, are applied to the problem of tropical cyclones with concentric eyewalls. The outer eyewall is shown to have an inherently ...

Jeffrey D. Kepert

2013-09-01T23:59:59.000Z

262

How does the boundary layer contribute to eyewall replacement cycles in axisymmetric tropical cyclones?  

Science Conference Proceedings (OSTI)

Three diagnostic models of the axisymmetric tropical cyclone boundary layer, with different levels of approximation, are applied to the problem of tropical cyclones with concentric eyewalls. The outer eyewall is shown to have an inherently ...

Jeffrey D. Kepert

263

On the Potential Use of Satellite Sounder Data in Forecasting Tropical Cyclone Motion  

Science Conference Proceedings (OSTI)

Although many prediction schemes are available, tropical cyclone track forecast errors are still unacceptably large. A primary difficulty is that tropical cyclones and their environments are poorly observed by conventional data networks. ...

Stanley Q. Kidder; Kae Shyu

1984-10-01T23:59:59.000Z

264

Observed Changes in Cyclone Activity in Canada and Their Relationships to Major Circulation Regimes  

Science Conference Proceedings (OSTI)

This study assessed the climate and trend of cyclone activity in Canada using mainly the occurrence frequency of cyclone deepening events and deepening rates, which were derived from hourly mean sea level pressure data observed at 83 Canadian ...

Xiaolan L. Wang; H. Wan; Val R. Swail

2006-03-01T23:59:59.000Z

265

Regional Observations during the Landfall of Tropical Cyclone Juliette (2001) in Baja California, Mexico  

Science Conference Proceedings (OSTI)

This paper presents an observational analysis of tropical cyclone landfall over the eastern Pacific Ocean. The tropical cyclone that developed during the 2001 season off the Mexican coast was named Juliette and made landfall in the Baja ...

Luis M. Farfán

2004-07-01T23:59:59.000Z

266

Evolution of Low-Level Angular Momentum in the 2 June 1995 Dimmitt, Texas, Tornado Cyclone  

Science Conference Proceedings (OSTI)

The life cycle of the 2 June 1995 Dimmitt, Texas, tornado cyclone, observed during the Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX), is described. The tornado cyclone here is defined as a significantly axisymmetric ...

Erik N. Rasmussen; Jerry M. Straka

2007-04-01T23:59:59.000Z

267

A Satellite Observational and Numerical Study of Precipitation Characteristics in Western North Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

Special Sensor Microwave/Imager (SSM/I) observations were used to examine the spatial and temporal changes of the precipitation characteristics of tropical cyclones. SSM/I observations were also combined with the results of a tropical cyclone ...

Edward B. Rodgers; Simon W. Chang; Harold F. Pierce

1994-02-01T23:59:59.000Z

268

Cyclone Performance for Reducing Biochar Concentrations in Syngas  

E-Print Network (OSTI)

Cotton gins have a readily available supply of biomass that is a by-product of cotton ginning. A 40 bph - cotton gin processing stripped cotton must manage 2,600 to 20,000 tonnes of cotton gin trash (CGT) annually. CGT contains approximately 16.3 MJ/kg (7000 Btu/lb.). CGT has the potential to serve as a renewable energy source. Gasification of biomasses such as CGT can offer processing facilities the opportunity to transform their waste biomass into electricity. The gasification of CGT yields 80% synthesis gas (syngas) and 20% biochar. The concentration of biochar in the syngas needs to be reduced prior to the direct fueling of an internal combustion engine driving a generator for electricity production. It was estimated that direct fueling of an internal combustion engine with syngas to drive the generator to produce electricity would cost $1M per megawatt (MW). In contrast, a 1MW system that consists of a boiler and steam turbine would cost $2M/MW. The current provisional patent for the TAMU fluidized bed gasification (FBG) unit uses a 1D2D and 1D3D cyclone for the removal of biochar. A cyclone test stand was designed and constructed to evaluate cyclone capture efficiencies of biochar. A statistical experiment design was used to evaluate cyclone performances for varying concentrations of biochar. A total of 24 tests for the 1D2D and 36 tests for the 1D3D cyclone were conducted at ambient conditions. Average collection efficiency for the 1D2D cyclone was 96.6% and 96.9% for the 1D3D cyclone. An analysis on the cyclone’s pressure drop was performed to compare the change in pressure drop from air only passing through the cyclone and when the cyclones are loaded with biochar. The average change in pressure drop for the 1D2D cyclone was a decrease of 74%, and the average change in pressure drop for the 1D3D cyclone was a decrease of 36%. An economic feasibility study was conducted to determine the price per kWh to produce electricity for a CGT fueled internal combustion engine power plant (ICPP) and a boiler and steam turbine power plant (SPP). The simulated cotton gin is a 40 bph rated facility operating for 2,000 hours a season (200% utilization) processing stripped cotton that yields approximately 180 kg/bale (400 lbs/bale) of CGT. Revenues consist of the electricity and natural gas expenses incurred during the ginning season, along with the extra electricity produced and sold back to the utility company at the whole price. Loan payments and operating costs include labor, maintenance, taxes, and insurance. Labor costs, the selling price of electricity and biochar are varied in the economic model. The ICPP has a NPV of $1,480,000, and the SPP has a NPV of -$160,000, under the base assumptions. The sensitivity analysis resulted in the selling price of electricity as having the largest change on the NPV for both of the power plants. The average predicted purchase price of electricity is $0.10/kWh for the twenty year simulation. The average price to produce electricity, with no source of revenue generation for the ICPP is $0.20/kWh and $0.26/kWh for the SPP.

Saucier, David Shane

2013-08-01T23:59:59.000Z

269

NETL: Advanced NOx Emissions Control: Control Technology - ALTA for Cyclone  

NLE Websites -- All DOE Office Websites (Extended Search)

Full-Scale Demonstration of ALTA NOx Control for Cyclone-Fired Boilers Full-Scale Demonstration of ALTA NOx Control for Cyclone-Fired Boilers The primary goal of this project was to evaluate a technology called advanced layered technology application (ALTA) as a means to achieve NOx emissions below 0.15 lb/MMBtu in a cyclone boiler. Reaction Engineering International (REI) conducted field testing and combustion modeling to refine the process design, define the optimum technology parameters, and assess system performance. The ALTA NOx control technology combines deep staging from overfire air, rich reagent injection (RRI), and selective non-catalytic reduction (SNCR). Field testing was conducted during May-June 2005 at AmerenUE's Sioux Station Unit 1, a 500 MW cyclone boiler unit that typically burns an 80/20 blend of Powder River Basin subbituminous coal and Illinois No. 6 bituminous coal. Parametric testing was also conducted with 60/40 and 0/100 blends. The testing also evaluated process impacts on balance-of-plant issues such as the amount of unburned carbon in the ash, slag tapping, waterwall corrosion, ammonia slip, and heat distribution.

270

State of the Science: Radar View of Tropical Cyclones  

Science Conference Proceedings (OSTI)

Radar played an important role in studies of tropical cyclones since it was developed in the 1940s. In the last 15 years, technological improvements such as the U.S. National Oceanic and Atmospheric Administration (NOAA) WP-3D tail airborne ...

Frank D. Marks Jr.

2003-08-01T23:59:59.000Z

271

Cyclone Tracking in Different Spatial and Temporal Resolutions  

Science Conference Proceedings (OSTI)

The quality of cyclone tracks associated with model output of various resolutions is determined using a high-resolution dataset (1.125° × 1.125°, 2 h) mapped to different spatial (triangular truncations, T21, T42, T63, T84) and temporal ...

R. Blender; M. Schubert

2000-02-01T23:59:59.000Z

272

The Detection of Flow Asymmetries in the Tropical Cyclone Environment  

Science Conference Proceedings (OSTI)

Data from a numerical simulation of a moving barotropic vortex on a sphere with 10-km resolution are used to assess the ability of a state-of-the-art objective analysis scheme to detect certain large-scale tropical cyclone asymmetries, the so-...

Michael J. Reeder; Roger K. Smith; Stephen J. Lord

1991-03-01T23:59:59.000Z

273

Cyclone reactor with internal separation and axial recirculation  

DOE Patents (OSTI)

A cyclone combustor apparatus contains a circular partition plate containing a central circular aperture. The partition plate divides the apparatus into a cylindrical precombustor chamber and a combustor chamber. A coal-water slurry is passed axially into the inlet end of the precombustor chamber, and primary air is passed tangentially into said chamber to establish a cyclonic air flow. Combustion products pass through the partition plate aperture and into the combustor chamber. Secondary air may also be passed tangentially into the combustor chamber adjacent the partition plate to maintain the cyclonic flow. Flue gas is passed axially out of the combustor chamber at the outlet end and ash is withdrawn tangentially from the combuston chamber at the outlet end. A first mixture of flue gas and ash may be tangentially withdrawn from the combustor chamber at the outlet end and recirculated to the axial inlet of the precombustor chamber with the coal-water slurry. A second mixture of flue gas and ash may be tangentially withdrawn from the outlet end of the combustor chamber and passed to a heat exchanger for cooling. Cooled second mixture is then recirculated to the axial inlet of the precombustor chamber. In another embodiment a single cyclone combustor chamber is provided with both the recirculation streams of the first mixture and the second mixture.

Becker, Frederick E. (Reading, MA); Smolensky, Leo A. (Concord, MA)

1989-01-01T23:59:59.000Z

274

An Objective Satellite-Based Tropical Cyclone Size Climatology  

Science Conference Proceedings (OSTI)

Storm-centered infrared (IR) imagery of tropical cyclones (TCs) is related to the 850-hPa mean tangential wind at a radius of 500 km (V500) calculated from six-hourly global numerical analyses for North Atlantic and eastern North Pacific TCs 1995-...

John A. Knaff; Scott P. Longmore; Debra A. Molenar

275

A Test of Convective Parameterizations in a Tropical Cyclone Model  

Science Conference Proceedings (OSTI)

In recent years a number of different methods have been proposed for the inclusion of the effects of cumuli in numerical models of tropical cyclones. In this paper several of the Kuo-type parameterizations have been tested by simulating the ...

Jay S. Hobgood; John N. Rayner

1989-06-01T23:59:59.000Z

276

Recurving Tropical Cyclones: Singular Vector Sensitivity and Downstream Impacts  

Science Conference Proceedings (OSTI)

Singular vectors (SVs) are used to study the sensitivity of 2-day forecasts of recurving tropical cyclones (TCs) in the western North Pacific to changes in the initial state. The SVs are calculated using the tangent and adjoint models of the Navy ...

Carolyn A. Reynolds; Melinda S. Peng; Jan-Huey Chen

2009-04-01T23:59:59.000Z

277

Maximum Potential Intensities of Tropical Cyclones near Isla Socorro, Mexico  

Science Conference Proceedings (OSTI)

The maximum potential intensity (MPI) of a tropical cyclone represents a theoretical upper limit to the strength of the storm imposed by the laws of physics and the energy available to the system in the atmosphere and the ocean. The MPI in this ...

Jay S. Hobgood

2003-12-01T23:59:59.000Z

278

Tropical Cyclone Destructive Potential by Integrated Kinetic Energy  

Science Conference Proceedings (OSTI)

Tropical cyclone damage potential, as currently defined by the Saffir–Simpson scale and the maximum sustained surface wind speed in the storm, fails to consider the area impact of winds likely to force surge and waves or cause particular levels ...

Mark D. Powell; Timothy A. Reinhold

2007-04-01T23:59:59.000Z

279

Automatic Template Matching Method for Tropical Cyclone Eye Fix  

Science Conference Proceedings (OSTI)

A time-honored way of finding, or fixing, the center of a tropical cyclone (TC) is to overlay templates of spirals onto a printout of radar or satellite image. Modern methods, however, mostly focus on wind field analysis, or other motion vector techniques. ...

Wong Ka Yan; Yip Chi Lap; Li Ping Wah; Tsang Wai Wan

2004-08-01T23:59:59.000Z

280

Statistical Tropical Cyclone Wind Radii Prediction Using Climatology and Persistence  

Science Conference Proceedings (OSTI)

An operational model used to predict tropical cyclone wind structure in terms of significant wind radii (i.e., 34-, 50-, and 64-kt wind radii, where 1 kt = 0.52 m s?1) at the National Oceanic and Atmospheric Administration/National Hurricane ...

John A. Knaff; Charles R. Sampson; Mark DeMaria; Timothy P. Marchok; James M. Gross; Colin J. McAdie

2007-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

A QuikSCAT climatology of tropical cyclone size  

E-Print Network (OSTI)

QuikSCAT data of near-surface wind vectors for the years 1999–2008 are used to create a climatology of tropical cyclone (TC) size, defined as the radius of vanishing winds. The azimuthally-averaged radius of 12 ms?1 [ms ...

Chavas, Daniel Robert

282

A Simple Seasonal Forecast Update of Tropical Cyclone Activity  

Science Conference Proceedings (OSTI)

A simple method based on the cumulative number of tropical cyclones (TCs) up to a given month in the early season is proposed to update the seasonal prediction of the annual number of TCs in a given ocean basin. For the western North Pacific, if ...

Johnny C. L. Chan

2008-10-01T23:59:59.000Z

283

On the Decay of Tropical Cyclone Winds Crossing Narrow Landmasses  

Science Conference Proceedings (OSTI)

A method is developed to adjust the Kaplan and DeMaria tropical cyclone inland wind decay model for storms that move over narrow landmasses. The basic assumption that the wind speed decay rate after landfall is proportional to the wind speed is ...

Mark DeMaria; John A. Knaff; John Kaplan

2006-03-01T23:59:59.000Z

284

Sensitivity of Model Simulations for a Coastal Cyclone  

Science Conference Proceedings (OSTI)

A nested global, limited-area model was used to predict the President's Day cyclone of 18-19 February 1979. Both a low (150 km) and a high (50 km) horizontal resolution version were used. The model has full physics with a planetary boundary ...

Isidoro Orlanski; Jack J. Katzfey

1987-11-01T23:59:59.000Z

285

A Simulation Study of the Landfall of Tropical Cyclones  

Science Conference Proceedings (OSTI)

By use of a triply nested, movable mesh model, several ideal simulations OF tropical Cyclone landfall were performed for a strong zonal flow of 10 m s-1. The integration domain was a 37 × 45° channel with the innermost mesh having a 22 × 22 ...

Robert E. Tuleya; Morris A. Bender; Yoshio Kurihara

1984-01-01T23:59:59.000Z

286

Tropical Cyclone– and Monsoon-Induced Rainfall Variability in Taiwan  

Science Conference Proceedings (OSTI)

This study investigates the interannual variability of tropical cyclone (TC)- and monsoon-induced rainfall (P) in Taiwan during July–September for the period 1950–2002. To examine the relative effects of TCs and monsoons, local rainfall in Taiwan ...

Jau-Ming Chen; Tim Li; Ching-Feng Shih

2010-08-01T23:59:59.000Z

287

Cyclone reactor with internal separation and axial recirculation  

DOE Patents (OSTI)

A cyclone combustor apparatus contains a circular partition plate containing a central circular aperture is described. The partition plate divides the apparatus into a cylindrical precombustor chamber and a combustor chamber. A coal-water slurry is passed axially into the inlet end of the precombustor chamber, and primary air is passed tangentially into said chamber to establish a cyclonic air flow. Combustion products pass through the partition plate aperture and into the combustor chamber. Secondary air may also be passed tangentially into the combustor chamber adjacent the partition plate to maintain the cyclonic flow. Flue gas is passed axially out of the combustor chamber at the outlet end and ash is withdrawn tangentially from the combustor chamber at the outlet end. A first mixture of flue gas and ash may be tangentially withdrawn from the combustor chamber at the outlet end and recirculated to the axial inlet of the precombustor chamber with the coal-water slurry. A second mixture may be tangentially withdrawn from the outlet end and passed to a heat exchanger for cooling. Cooled second mixture is then recirculated to the axial inlet of the precombustor chamber. In another embodiment a single cyclone combustor chamber is provided with both the recirculation streams of the first mixture and the second mixture. 10 figs.

Becker, F.E.; Smolensky, L.A.

1988-07-19T23:59:59.000Z

288

Self-Adapting Analog Ensemble Predictions of Tropical Cyclone Tracks  

Science Conference Proceedings (OSTI)

An analog model is used to predict the tropical cyclone tracks in the Atlantic and east Pacific basins. The model is self-adapting in its search of ensembles of optimal historic analogs by creating a norm that minimizes the forecast error ...

Oliver Sievers; Klaus Fraedrich; Christoph C. Raible

2000-10-01T23:59:59.000Z

289

Upper Oceanic Energy Response to Tropical Cyclone Passage  

Science Conference Proceedings (OSTI)

The upper oceanic temporal response to tropical cyclone (TC) passage is investigated using a 6-yr daily record of data-driven analyses of two measures of upper ocean energy content based on the U.S. Navy’s Coupled Ocean Data Assimilation System ...

John A. Knaff; Mark DeMaria; Charles R. Sampson; James E. Peak; James Cummings; Wayne H. Schubert

2013-04-01T23:59:59.000Z

290

A New Method for Estimating Tropical Cyclone Wind Speed Probabilities  

Science Conference Proceedings (OSTI)

The National Hurricane Center (NHC) Hurricane Probability Program (HPP) was implemented in 1983 to estimate the probability that the center of a tropical cyclone would pass within 60 n mi of a set of specified points out to 72 h. Other than ...

Mark DeMaria; John A. Knaff; Richard Knabb; Chris Lauer; Charles R. Sampson; Robert T. DeMaria

2009-12-01T23:59:59.000Z

291

The Summer Cyclone Maximum over the Central Arctic Ocean  

Science Conference Proceedings (OSTI)

A fascinating feature of the northern high-latitude circulation is a prominent summer maximum in cyclone activity over the Arctic Ocean, centered near the North Pole in the long-term mean. This pattern is associated with the influx of lows ...

Mark C. Serreze; Andrew P. Barrett

2008-03-01T23:59:59.000Z

292

Effect of Beta Shear on Simulated Tropical Cyclones  

Science Conference Proceedings (OSTI)

Through cloud-resolving simulations, this study examines the effect of ? on the evolution of tropical cyclones (TCs). It is found that the TC simulated on a ? plane with variable Coriolis parameter f is weaker in intensity but larger in size and ...

Juan Fang; Fuqing Zhang

2012-10-01T23:59:59.000Z

293

Deep Cyclonic Circulation in the Gulf of Mexico  

Science Conference Proceedings (OSTI)

The anticyclonic Loop Current dominates the upper-layer flow in the eastern Gulf of Mexico, with a weaker mean anticyclonic pattern in the western gulf. There are reasons, however, to suspect that the deep mean flow should actually be cyclonic. ...

Christopher J. DeHaan; Wilton Sturges

2005-10-01T23:59:59.000Z

294

The Analysis of Tropical Cyclone Tracks in the Western North Pacific through Data Mining. Part I: Tropical Cyclone Recurvature  

Science Conference Proceedings (OSTI)

This paper is the first of a two-part series of papers that employs the data-mining approach to analyze tropical cyclone (TC) movement in the western North Pacific Ocean. Part I unravels conditions under which TCs tend to recurve, and Part II ...

Wei Zhang; Yee Leung; Johnny C. L. Chan

2013-06-01T23:59:59.000Z

295

The Analysis of Tropical Cyclone Tracks in the Western North Pacific through Data Mining. Part II: Tropical Cyclone Landfall  

Science Conference Proceedings (OSTI)

This is the second paper of a two-part series of papers on the analysis of tropical cyclone (TC) tracks in the western North Pacific Ocean. In this paper, TC landfalls in the South China Sea and western North Pacific basins are investigated ...

Wei Zhang; Yee Leung; Johnny C. L. Chan

2013-06-01T23:59:59.000Z

296

Vortex Rossby Waves in a Numerically Simulated Tropical Cyclone. Part II: The Role in Tropical Cyclone Structure and Intensity Changes  

Science Conference Proceedings (OSTI)

In Part I, the author analyzed the asymmetric structure in the inner core of a numerically simulated tropical cyclone and found that the asymmetry near the eyewall in the mid–lower troposphere is dominated by wavenumber-1 and -2 vortex Rossby ...

Yuqing Wang

2002-04-01T23:59:59.000Z

297

A field theoretical prediction of the tropical cyclone properties  

E-Print Network (OSTI)

The large scale atmospheric vortices (tropical cyclones, tornadoes) are complex physical systems combining thermodynamics and fluid-mechanical processes. The late phase of the evolution towards stationarity consists of the vorticity concentration, a well known tendency to self-organization, an universal property of the two-dimensional fluids. It may then be expected that the stationary state of the tropical cyclone has the same nature as the vortices of many other systems in nature: ideal (Euler) fluids, superconductors, Bose - Einsetin condensate, cosmic strings, etc. Indeed it was found that there is a description of the atmospheric vortex in terms of a field theory. It is compatible with the more conventional treatment based on conservation laws, but the field theoretical model reveals properties that are almost inaccessible to the conventional formulation: it identifies the stationary states as being close to self-duality. This is of highest importance: the self-duality is known to be the origin of all co...

Spineanu, Florin

2013-01-01T23:59:59.000Z

298

The South Pacific and southeast Indian Ocean tropical cyclone season 2000-01  

E-Print Network (OSTI)

Twelve tropical cyclones formed in the South Pacific and southeast Indian Ocean during the 2000-01 tropical cyclone season. Of these, four formed in the South Pacific east of 160°E. Cyclone numbers in the Australian region were slightly below average, while numbers in the South Pacific were significantly less than average. The season was characterised by moderate La Niña conditions, weakening towards the end of the season. Cyclone occurrences were linked to active phases of the 30 to 60-day intraseasonal oscillation.

P. W. Bate

2002-01-01T23:59:59.000Z

299

The Impact of Tropical Cyclones on Gulf of Mexico Crude Oil and ...  

U.S. Energy Information Administration (EIA)

wind speeds. Tropical depressions are cyclones having a maximum sustained wind ... Federally-administered offshore oil and natural gas production occurs on the OCS,

300

Effect of cyclone assisted milling on legume flour characteristics and functionality in selected food products.  

E-Print Network (OSTI)

??Legumes (cowpea and soybean) were milled using a cyclone-assisted attrition mill to produce fine legume flour. Milling variations consisted of alterations in mill design and… (more)

Jarrard, Mark, Jr.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Cloud to ground lightning in tropical cyclone: a study of 34 West Atlantic tropical cyclones from 1986-1996  

E-Print Network (OSTI)

Cloud to ground (CG) lightning characteristics and patterns were investigated for 34 tropical cyclones for the time period 1986 to 1996. Spatial analysis of CG lightning relative to both compass directions and the direction of motion were compiled. Additionally, a radial analysis of this data was performed within both a 300 km radius and a 50 km radius range. Finally, all analyses were stratified into all tropical cyclones and hurricane categories for further consideration. The National Lightning Detection Network recorded 307,593 CG lightning flashes within 300 km of the storms in this study. Negative flashes had an average first stroke peak current of -49 kA and a mean multiplicity of 2.7. Positive flashes occurred at a rate of 5.3 percent, with a mean peak current of 43 kA and 1.2 multiplicity average. Detected CG lightning characteristics changed significantly with a network upgrade in 1994. CG lightning flashes for all tropical cyclones favored the area south and west of the cyclone center. However, taking into account storm relative motion, the majority of flashes shifts to the front and right sections of the storm. Radial plots indicated lightning frequency increased throughout the domain, with a maximum between 270 km and 300 km. Hurricanes, however, indicated flashes occurred most often in the north and east quadrants. When adjusting for storm motion, the activity shifts to the right with some evidence of individual rainbands in the rear section. Radial plots indicated the increased organization of hurricanes, with a weak maxima in the convective eyewall, a minimum in the stratiform area, and a strong maximum in the outer rainbands. Further analysis indicated a higher frequency of CG lightning flashes in hurricanes suggests a state of hurricane strengthening or weakening. However, there was no direct correlation in the observed lightning frequency with a given change in the central pressure of the hurricane.

Coyne, John Michael

2001-01-01T23:59:59.000Z

302

Sensitivity of Tropical Cyclones to Surface Exchange Coefficients and a Revised Steady-State Model incorporating Eye Dynamics  

Science Conference Proceedings (OSTI)

Numerical and theoretical models of tropical cyclones indicate that the maximum wind speed in mature storms is sensitive to the ratio of the enthalpy and momentum surface exchange coefficients and that the spinup time of tropical cyclones varies ...

Kerry A. Emanuel

1995-11-01T23:59:59.000Z

303

The Extratropical Transition of Tropical Cyclone Lili (1996) and Its Crucial Contribution to a Moderate Extratropical Development  

Science Conference Proceedings (OSTI)

The transition that a tropical cyclone experiences as it moves into the extratropical environment (known as extratropical transition) can result in the decay or intensification of a baroclinic cyclone. The extratropical transition (ET) of ...

Anna Agustí-Panareda; Suzanne L. Gray; George C. Craig; Chris Thorncroft

2005-06-01T23:59:59.000Z

304

Interactions of Tropopause Depressions with an Ex–Tropical Cyclone and Sensitivity of Forecasts to Analysis Errors  

Science Conference Proceedings (OSTI)

This paper focuses on the coupling between an ex–tropical cyclone and two preexisting mesoscale tropopause depressions (TDs). The TDs approached the cyclone from widely separated sources after becoming cut off from different upper-level troughs ...

K. A. Browning; A. J. Thorpe; A. Montani; D. Parsons; M. Griffiths; P. Panagi; E. M. Dicks

2000-08-01T23:59:59.000Z

305

An Analysis of the Kinetic Energy Budget for Two Extratropical Cyclones: The Vertically Averaged Flow and the Vertical Shear Flow  

Science Conference Proceedings (OSTI)

An analysis of the kinetic energy budget is made for two intensely developing cyclones over North America. The principal kinetic energy source for the first cyclone is the net horizontal transport of kinetic energy across the boundaries of the ...

Jordan C. Alpert

1981-06-01T23:59:59.000Z

306

Numerical Simulation of Cyclone Sidr Using a Cloud-Resolving Model: Characteristics and Formation Process of an Outer Rainband  

Science Conference Proceedings (OSTI)

Cyclone Sidr, one of the most devastating tropical cyclones that resulted in several thousand deaths and substantial damages, developed in the north Indian Ocean and made landfall over the Bangladesh coast on 15 November 2007. Observation and ...

Nasreen Akter; Kazuhisa Tsuboki

2012-03-01T23:59:59.000Z

307

Synoptic Composites of the Extratropical Transition Life Cycle of North Atlantic Tropical Cyclones: Factors Determining Posttransition Evolution  

Science Conference Proceedings (OSTI)

A 34-member ensemble-mean trajectory through the cyclone phase space (CPS) is calculated using Navy Operational Global Atmospheric Prediction System (NOGAPS) analyses for North Atlantic tropical cyclones (TCs) undergoing extratropical transition (...

Robert E. Hart; Jenni L. Evans; Clark Evans

2006-02-01T23:59:59.000Z

308

Southern Hemisphere Winter Extratropical Cyclone Characteristics and Vertical Organization Observed with the ERA-40 Data in 1979–2001  

Science Conference Proceedings (OSTI)

The mean characteristics and trends of Southern Hemisphere (SH) winter extratropical cyclones occurring at six levels of the troposphere over the period 1979–2001 have been investigated using the 40-yr ECMWF Re-Analysis (ERA-40) data. Cyclonic ...

Eun-Pa Lim; Ian Simmonds

2007-06-01T23:59:59.000Z

309

Prediction and Diagnosis of Tropical Cyclone Formation in an NWP System. Part III: Diagnosis of Developing and Nondeveloping Storms  

Science Conference Proceedings (OSTI)

This is the third of a three-part investigation into tropical cyclone (TC) genesis in the Australian Bureau of Meteorology’s Tropical Cyclone Limited Area Prediction System (TC-LAPS), an operational numerical weather prediction (NWP) forecast ...

K. J. Tory; N. E. Davidson; M. T. Montgomery

2007-09-01T23:59:59.000Z

310

An Empirical Model for Predicting the Decay of Tropical Cyclone Wind Speed after Landfall over the Indian Region  

Science Conference Proceedings (OSTI)

An empirical model for predicting the maximum surface wind speed associated with a tropical cyclone after crossing the east coast of India is described. The model parameters are determined from the database of 19 recent cyclones. The model is ...

S. K. Roy Bhowmik; S. D. Kotal; S. R. Kalsi

2005-01-01T23:59:59.000Z

311

A Technique to Determine the Radius of Maximum Wind of a Tropical Cyclone  

Science Conference Proceedings (OSTI)

A simple technique is developed that enables the radius of maximum wind of a tropical cyclone to be estimated from satellite cloud data. It is based on the characteristic cloud and wind structure of the eyewall of a tropical cyclone, after the ...

France Lajoie; Kevin Walsh

2008-10-01T23:59:59.000Z

312

Stability and charging characteristics of the comma head region of continental winter cyclones  

Science Conference Proceedings (OSTI)

This paper presents analyses of the fine-scale structure of convection in the comma head of two continental winter cyclones and a 16-storm climatology analyzing the distribution of lightning within the comma head. A case study of a deep cyclone is ...

Robert M. Rauber; Joseph Wegman; David M. Plummer; Andrew A. Rosenow; Melissa Peterson; Greg M. McFarquhar; Brian F. Jewett; David Leon; Patrick S. Market; Kevin R. Knupp; Jason M. Keeler; Steven M. Battaglia

313

Norwegian-Type and Cold Front Aloft–Type Cyclones East of the Rocky Mountains  

Science Conference Proceedings (OSTI)

Conventional data and mesoscale model simulations are used to analyze two cyclones that developed east of the Rocky Mountains in June and November 1998. Both cyclones formed when a Pacific cold front overtook a lee trough/dryline east of the ...

John D. Locatelli; Ralph D. Schwartz; Mark T. Stoelinga; Peter V. Hobbs

2002-02-01T23:59:59.000Z

314

Statistical modelling of tropical cyclone genesis: a non-parametric model for the annual distribution  

E-Print Network (OSTI)

As part of a project to develop more accurate estimates of the risks due to tropical cyclones, we describe a non-parametric method for the statistical simulation of the location of tropical cyclone genesis. The method avoids the use of arbitrary grid boxes, and the spatial smoothing of the historical data is constructed optimally according to a clearly defined merit function.

Hall, T; Hall, Tim; Jewson, Stephen

2005-01-01T23:59:59.000Z

315

Variation in aerosol properties over Hyderabad, India during intense cyclonic conditions  

Science Conference Proceedings (OSTI)

In this study, we examine the changes in aerosol properties associated with an intense tropical cyclone, the so-called 'Mala', that occurred during April 2006, over the Bay of Bengal. This cyclone, accompanied by very strong surface winds reaching 240 km h-1, ...

K. V. S. Badarinath; Shailesh Kumar Kharol; V. Krishna Prasad; D. G. Kaskaoutis; H. D. Kambezidis

2008-08-01T23:59:59.000Z

316

The South Pacific and southeast Indian Ocean tropical cyclone season 1998-99  

E-Print Network (OSTI)

Twenty tropical cyclones formed in the South Pacific and southeast Indian Ocean region during the 1998- 99 season. An uncharacteristic early start to the season saw the development of cyclone Zelia in early October followed by Alison in early November. But the season was most noted for the development

Sue Oates

2000-01-01T23:59:59.000Z

317

Statistical modelling of tropical cyclone genesis: a non-parametric model for the annual distribution  

E-Print Network (OSTI)

As part of a project to develop more accurate estimates of the risks due to tropical cyclones, we describe a non-parametric method for the statistical simulation of the location of tropical cyclone genesis. The method avoids the use of arbitrary grid boxes, and the spatial smoothing of the historical data is constructed optimally according to a clearly defined merit function. 1

Tim Hall; Stephen Jewson

2008-01-01T23:59:59.000Z

318

Kernel Density Estimation Applied to Tropical Cyclones Genesis in Northwestern Pacific  

Science Conference Proceedings (OSTI)

It is recognized that although the conditions necessary for generating cyclones are actually present in the tropical latitudes for much of the year, the storms themselves are comparatively rare. In addition, the skill of forecasting the occurrence of ... Keywords: genesis, kernel density estimation, tropical cyclone

Zhao Haikun; Wu Liguang; Zhou Weican

2009-07-01T23:59:59.000Z

319

The Role of Latent Heat Release in the Evolution of a Weak Extratropical Cyclone  

Science Conference Proceedings (OSTI)

A study of the sensitivity of a weak winter extratropical cyclone to latent heat release (LHR) is presented using 48-h simulations of the cyclone's evolution derived from three versions of the LFM model: a MOIST simulation in which full model ...

John E. Zimmerman; Phillip J. Smith; David R. Smith

1989-05-01T23:59:59.000Z

320

Performance of the Nested Tropical Cyclone Model as a Function of Five Storm-Related Parameters  

Science Conference Proceedings (OSTI)

A detailed analysis of the performance of the U.S. Navy Nested Tropical Cyclone Model (NTCM) for western North Pacific tropical cyclones is made based on five storm-related factors: latitude, longitude, intensity, 12-h intensity change and size (...

Johnny C-L. Chan; Brian J. Williams; Russell L. Elsberry

1987-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Analog Ensemble Forecasts of Tropical Cyclone Tracks in the Australian Region  

Science Conference Proceedings (OSTI)

Tropical cyclone tracks in the Australian basin are predicted by an analog ensemble forecast model. It is self-adapting in its search of optimal ensemble members from historic cyclone tracks by creating a metric that minimizes the error of the ...

Klaus Fraedrich; Christoph C. Raible; Frank Sielmann

2003-02-01T23:59:59.000Z

322

An Automated Method to Estimate Tropical Cyclone Intensity Using SSM/I Imagery  

Science Conference Proceedings (OSTI)

An automated method to estimate tropical cyclone intensity using Special Sensor Microwave Imager (SSM/I) data is developed and tested. SSM/I images (512 km × 512 km) centered on a given tropical cyclone (TC), with a known best-track intensity, ...

Richard L. Bankert; Paul M. Tag

2002-05-01T23:59:59.000Z

323

Some Implications of Core Regime Wind Structures in Western North Pacific Tropical Cyclones  

Science Conference Proceedings (OSTI)

In this study, a tropical cyclone (TC) is considered to be compact if 1) the radius of maximum wind or the maximum tangential wind is smaller than what would be expected for an average tropical cyclone of the same intensity or the same radius of ...

Delia Yen-Chu Chen; Kevin K. W. Cheung; Cheng-Shang Lee

2011-02-01T23:59:59.000Z

324

A Diagnostic Study of the Intensity of Three Tropical Cyclones in the Australian Region. Part I: A Synopsis of Observed Features of Tropical Cyclone Kathy (1984)  

Science Conference Proceedings (OSTI)

Objective streamline analyses and digitized high-resolution IR satellite cloud data have been used to examine in detail the changes in the environmental circulation and in the cloud structure that took place in and around Tropical Cyclone Kathy (...

France Lajoie; Kevin Walsh

2010-01-01T23:59:59.000Z

325

RSS Feeds for Specific Tropical Cyclones of the North Atlantic, Caribbean  

NLE Websites -- All DOE Office Websites (Extended Search)

RSS Feeds for Specific Tropical Cyclones of the North Atlantic, Caribbean RSS Feeds for Specific Tropical Cyclones of the North Atlantic, Caribbean Sea, and Gulf of Mexico (English) Agriculture Community Menu DATA APPS EVENTS DEVELOPER STATISTICS COLLABORATE ABOUT Agriculture You are here Data.gov » Communities » Agriculture » Data RSS Feeds for Specific Tropical Cyclones of the North Atlantic, Caribbean Sea, and Gulf of Mexico (English) Dataset Summary Description The National Weather Service (NWS) National Hurricane Center uses regularly updated RSS feeds to disseminate North Atlantic, Caribbean Sea, and Gulf of Mexcio tropical cyclone and marine forecasts. Tags {hurricanes,"tropical cyclones",warning,watch," forecast",discussion,outlooks,"",marine,temperature," Atlantic","Caribbean Sea","Gulf of Mexico. "}

326

Power Outages Update: Post-Tropical Cyclone Sandy | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Outages Update: Post-Tropical Cyclone Sandy Outages Update: Post-Tropical Cyclone Sandy Power Outages Update: Post-Tropical Cyclone Sandy October 29, 2012 - 9:37pm Addthis Sandy made landfall as a post-tropical cyclone on the southern coast of New Jersey near Atlantic City at 8 p.m. with top sustained winds of 80 mph. | Photo courtesy of NOAA Sandy made landfall as a post-tropical cyclone on the southern coast of New Jersey near Atlantic City at 8 p.m. with top sustained winds of 80 mph. | Photo courtesy of NOAA Dan Leistikow Dan Leistikow Former Director, Office of Public Affairs As of 8:00 pm EDT on October 29, there were more than 3.6 million customers without power in the affected states. The Energy Department is continuing to monitor the progress of the storm throughout the night and will publish

327

Tropical cyclone Tracy – numerical guidance then and now  

E-Print Network (OSTI)

The passing of over three decades since tropical cyclone Tracy devastated Darwin on Christmas Day 1974 provided a reason to reflect upon the progress of numerical weather prediction over that period. Each decade was characterised by major model changes. In Australia, the 1970s saw the operational implementation of a 7-level baroclinic filtered model at a grid spacing of 254 km, with rudimentary representation of physical processes. The 1980s witnessed the operational introduction of a 12-level primitive equations model with a grid spacing of 150 km and enhanced representation of both the data assimilation approach and the model physics. Finally, in the 1990s the modeling capacity had reached the point where a 40-level model with a grid spacing of 5 km, such as the one employed here, could be run in near real-time, nested over the area of interest. Some research versions also had became available at even higher resolutions. Further improvements in the representation of physical processes and advanced data assimilation procedures, such as 4D-Var, were also available. Here, three models similar to those cited above were run out to 48 hours for the tropical cyclone Tracy case. In all models a bogussed vortex was required to provide

John F. Le Marshall; Lance M. Leslie

2009-01-01T23:59:59.000Z

328

Low NO sub x /SO sub x Burner retrofit for utility cyclone boilers  

Science Conference Proceedings (OSTI)

The objective of this project is to demonstrate the LNS Burner as retrofitted to the host cyclone boiler for effective low-cost control of NO{sub x} and SO{sub x} emissions while firing a bituminous coal. The LNS Burner employs a simple, innovative combustion process to burn pulverized coal at high temperatures and provides effective, low-cost control of sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) emissions. The coal ash contains sulfur and is removed in the form of molten slag and flyash. Cyclone-fired boiler units are typically older units firing high-sulfur bituminous coals at very high temperatures which results in very high NO{sub x} and SO{sub x} emissions. The addition of conventional emission control equipment, such as wet scrubbers, to these older cyclone units in order to meet current and future environmental regulations is generally not economic. Further, the units are generally not compatible with low sulfur coal switching for S0{sub 2} control or selective catalytic reduction technologies for NO{sub x} control. Because the LNS Burner operates at the same very high temperatures as a typical cyclone boiler and produces a similar slag product, it may offer a viable retrofit option for cyclone boiler emission control. This was confirmed by the Cyclone Boiler Retrofit Feasibility Study carried out by TransAlta and an Operating Committee formed of cyclone boiler owners in 1989. An existing utility cyclone boiler, was then selected for the evaluation of the cost and performance study. It was concluded that the LNS Burner retrofit would be a cost-effective option for control of cyclone boiler emissions. A full-scale demonstration of the LNS Burner retrofit was selected in October 1988 as part of the DOE's Clean Coal Technology Program Round II.

Not Available

1990-01-01T23:59:59.000Z

329

Continuous Cyclone Barrel Flame Temperature Measurement Using Ultraviolet-Visible Emission Spectroscopy  

Science Conference Proceedings (OSTI)

Cyclone boilers represent more than 10 of the coal-fired boiler capacity in the United States and exhibit low electricity generation costs. Production of cyclone boilers, however, ended in the 1970s due to the Clean Air Act and the difficulty of cost-effectively meeting NOx emission requirements under New Source Review standards. By burning coal at high turbulence and temperature in cyclone boilers, coal ash is removed as molten slag, reducing the fly ash content of the flue gas. The high heat release ra...

2005-12-05T23:59:59.000Z

330

Sub-pilot testing of an acoustically enhanced cyclone for PFBC  

SciTech Connect

The overall program objective is to demonstrate, on the subpilot-scale, the effectiveness of an acoustically enhanced cyclone collector under high temperature, high pressure conditions found in coal-fired pressurized fluidized bed combustion (PFBC) combined cycle power generating systems. The data obtained will be used to design an acoustically enhanced cyclone gas cleanup system which can meet the New Source Performance Standards (NSPS) particulate control level with capital and operating costs significantly lower than currently available with conventional cyclones and post turbine particulate control.

Galica, M.A.; Rawlins, D.C.

1992-01-01T23:59:59.000Z

331

Sub-pilot testing of an acoustically enhanced cyclone for PFBC  

SciTech Connect

The overall program objective is to demonstrate, on the subpilot-scale, the effectiveness of an acoustically enhanced cyclone collector under high temperature, high pressure conditions found in coal-fired pressurized fluidized bed combustion (PFBC) combined cycle power generating systems. The data obtained will be used to design an acoustically enhanced cyclone gas cleanup system which can meet the New Source Performance Standards (NSPS) particulate control level with capital and operating costs significantly lower than currently available with conventional cyclones and post turbine particulate control.

Galica, M.A.; Rawlins, D.C.

1992-12-01T23:59:59.000Z

332

Tropical Cyclone Forecasting Applications of the GOES WMSI  

E-Print Network (OSTI)

The Geostationary Operational Environmental Satellite (GOES) sounder-derived Wet Microburst Severity Index (WMSI) was originally developed and implemented to assess the potential magnitude of convective downbursts over the central and eastern continental United States. The WMSI algorithm incorporates convective available potential energy (CAPE), to parameterize static instability, as well as the vertical theta-e (equivalent potential temperature) difference (TeD) between the surface and mid-troposphere to infer the presence of a mid-level dry air layer. It has been noted with two recent landfalling hurricanes over the Florida Gulf of Mexico coast that the GOES WMSI product accurately predicted downburst magnitude associated with convective bands and the eye wall. As a convective system, it is expected that tropical cyclones can be profilic downburst producing storms. In fact, several severe downbursts were observed in association with the pre-hurricane squall line and remnant eye wall of Hurricane Charley (Au...

Pryor, K L

2006-01-01T23:59:59.000Z

333

Synthetic laser medium  

DOE Patents (OSTI)

A laser medium is particularly useful in high average power solid state lasers. The laser medium includes a chromium dopant and preferably neodymium ions as codopant, and is primarily a gadolinium scandium gallium garnet, or an analog thereof. Divalent cations inhibit spiral morphology as large boules from which the laser medium is derived are grown, and a source of ions convertible between a trivalent state and a tetravalent state at a low ionization energy are in the laser medium to reduce an absorption coefficient at about one micron wavelength otherwise caused by the divalent cations. These divalent cations and convertible ions are dispersed in the laser medium. Preferred convertible ions are provided from titanium or cerium sources.

Stokowski, S.E.

1987-10-20T23:59:59.000Z

334

The Development and Assessment of a Model-, Grid-, and Basin-Independent Tropical Cyclone Detection Scheme  

Science Conference Proceedings (OSTI)

A novel approach to tropical cyclone (TC) detection in coarse-resolution numerical model data is introduced and assessed. This approach differs from traditional detectors in two main ways. First, it was developed and tuned using 20 yr of ECMWF ...

K. J. Tory; S. S. Chand; R. A. Dare; J. L. McBride

2013-08-01T23:59:59.000Z

335

Do Frontal Cyclones Change Size? Observed Widths of North Pacific Lows  

Science Conference Proceedings (OSTI)

Wavelet transforms in the longitudinal and latitudinal directions are applied to sea level pressure data for 12 extratropical cyclones. Each low is tracked over time from a stage of small amplitude to a stage of large amplitude. The wavelet ...

Richard Grotjahn; Daniel Hodyss; Cris Castello

1999-06-01T23:59:59.000Z

336

An Objective Method for Forecasting Tropical Cyclone Intensity Using Nimbus-5 Electrically Scanning Microwave Radiometer Measurements  

Science Conference Proceedings (OSTI)

An empirical analysis program, based on finding an optimal representation of the data, has been applied to 120 observations of twenty nine 1973 and 1974 North Pacific tropical cyclones. Each observation consists of a field of Nimbus-5 ...

Herbert E. Hunter; Edward B. Rodgers; William E. Shenk

1981-02-01T23:59:59.000Z

337

The Link between Summertime Cloud Radiative Forcing and Extratropical Cyclones in the North Pacific  

Science Conference Proceedings (OSTI)

This paper examines the role of extratropical cyclones in determining the cloud radiative forcing over the North Pacific during summer. Specifically, this study uses daily and monthly ERBE cloud radiative forcing, monthly ISCCP cloud-type ...

C. P. Weaver; V. Ramanathan

1996-09-01T23:59:59.000Z

338

Polar Mesoscale Cyclones in the Northeast Atlantic: Comparing Climatologies from ERA-40 and Satellite Imagery  

Science Conference Proceedings (OSTI)

Polar mesoscale cyclones over the subarctic are thought to be an important component of the coupled atmosphere–ocean climate system. However, the relatively small scale of these features presents some concern as to their representation in the ...

Alan Condron; Grant R. Bigg; Ian A. Renfrew

2006-05-01T23:59:59.000Z

339

A Comparison of the Performance of Two Operational Dynamic Tropical Cyclone Models  

Science Conference Proceedings (OSTI)

This paper compares the performance of two multi-level high-resolution baroclinic tropical cyclone models which are currently in operational use. In the Atlantic, the National Hurricane Center utilizes the Movable Fine-mesh Model (MFM) for ...

Michael Fiorino; Edward J. Harrison Jr.; Donald G. Marks

1982-07-01T23:59:59.000Z

340

Relating the Skill of Tropical Cyclone Intensity Forecasts to the Synoptic Environment  

Science Conference Proceedings (OSTI)

Prior knowledge of the performance of a tropical cyclone intensity forecast holds the potential to increase the value of forecasts for end users. The values of certain dynamical parameters, such as storm speed, latitude, current intensity, ...

Kieran T. Bhatia; David S. Nolan

2013-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Predictability Characteristics of Landfalling Cyclones along the North American West Coast  

Science Conference Proceedings (OSTI)

The predictability of North Pacific cyclones can vary widely, from highly accurate prediction of storm intensity and location to forecast position errors of hundreds of kilometers and central pressure errors of tens of hectopascals. In this study, ...

Lynn A. McMurdie; Brian Ancell

2014-01-01T23:59:59.000Z

342

Midtropospheric Closed Cyclone Formation over the Southwestern United States, the Eastern United States, and the Alps  

Science Conference Proceedings (OSTI)

Observational composites of midtropospheric closed cyclone formation are constructed and diagnosed for three regions: the southwestern United States, the eastern United States, and the southern lee of the Alps. The spatial scales upon which ...

Gerald D. Bell; Lance F. Bosart

1994-05-01T23:59:59.000Z

343

The Influence of Atlantic Tropical Cyclones on Drought over the Eastern United States (1980–2007)  

Science Conference Proceedings (OSTI)

To assess the influence of Atlantic tropical cyclones (TCs) on the eastern U.S. drought regime, the Variable Infiltration Capacity (VIC) land surface hydrologic model was run over the eastern United States forced by the North American Land Data ...

Jonghun Kam; Justin Sheffield; Xing Yuan; Eric F. Wood

2013-05-01T23:59:59.000Z

344

Precipitation Distribution Associated with Landfalling Tropical Cyclones over the Eastern United States  

Science Conference Proceedings (OSTI)

Tropical cyclones (TCs) making landfall over the United States are examined by separating those associated with precipitation predominantly left of their tracks from those with the same to the right of their tracks. Composites of atmospheric ...

Eyad Atallah; Lance F. Bosart; Anantha R. Aiyyer

2007-06-01T23:59:59.000Z

345

An Analysis of Atlantic Tropical Cyclone Forecast Errors, 1970–1979  

Science Conference Proceedings (OSTI)

Official Atlantic tropical cyclone track forecasts issued by the National Hurricane Center over the decade of the 1970's are examined in this study. The purpose is to isolate any significant biases, trends or other statistical properties of the ...

Charles S. Neumann; Joseph M. Pelissier

1981-06-01T23:59:59.000Z

346

The Impacts of Climate Change on Autumn North Atlantic Midlatitude Cyclones  

Science Conference Proceedings (OSTI)

This study explores how midlatitude extratropical cyclone intensities, frequencies, and tracks can be modified under warming-induced conditions due to enhanced greenhouse gas (GHG) concentrations. Simulations were performed with the Canadian ...

Jing Jiang; William Perrie

2007-04-01T23:59:59.000Z

347

Interactions between Simulated Tropical Cyclones and an Environment with a Variable Coriolis Parameter  

Science Conference Proceedings (OSTI)

Numerical simulations of tropical cyclones are performed to examine the effects of a variable Coriolis parameter on the structure and intensity of hurricanes. The simulations are performed using the nonhydrostatic fifth-generation Pennsylvania ...

Elizabeth A. Ritchie; William M. Frank

2007-05-01T23:59:59.000Z

348

The Impact of Outflow Environment on Tropical Cyclone Intensification and Structure  

Science Conference Proceedings (OSTI)

In this study, the impacts of regions of weak inertial stability on tropical cyclone intensification and peak strength are examined. It is demonstrated that weak inertial stability in the outflow layer minimizes an energy sink of the tropical ...

Eric D. Rappin; Michael C. Morgan; Gregory J. Tripoli

2011-02-01T23:59:59.000Z

349

Environmental Factors Contributing to Tropical Cyclone Genesis over the Western North Pacific  

Science Conference Proceedings (OSTI)

The flow environment associated with tropical cyclone genesis (TCG) over the western North Pacific was assessed via categorization into five flow patterns: monsoon shear line (SL), monsoon confluence region (CR), monsoon gyre (GY), easterly wave (...

Ryuji Yoshida; Hirohiko Ishikawa

2013-02-01T23:59:59.000Z

350

Occurrence and Structure of Mesoscale Fronts and Cyclones near Icy Bay, Alaska  

Science Conference Proceedings (OSTI)

When synoptic-scale cyclones stagnate against the mountains of southeast Alaska, a trough extends to the northwest, along the southern Alaskan coast. A front between maritime and continental air masses develops along the coast. During early ...

Michael Reynolds

1983-10-01T23:59:59.000Z

351

The Interannual Variability in the Genesis Location of Tropical Cyclones in the Northwest Pacific  

Science Conference Proceedings (OSTI)

Variations in the seasonal mean (July–October) genesis positions of tropical cyclones (TCs) in the western North Pacific associated with variations in the large-scale atmospheric circulation are investigated. Analysis shows considerable ...

Hsin Hsing Chia; C. F. Ropelewski

2002-10-01T23:59:59.000Z

352

The Effects of Vertical Wind Shear on the Distribution of Convection in Tropical Cyclones  

Science Conference Proceedings (OSTI)

The influence of vertical wind shear on the azimuthal distribution of cloud-to-ground lightning in tropical cyclones was examined using flash locations from the National Lightning Detection Network. The study covers 35 Atlantic basin tropical ...

Kristen L. Corbosiero; John Molinari

2002-08-01T23:59:59.000Z

353

The Effect of Resolution on the Depiction of Central Pressure for an Intense Oceanic Extratropical Cyclone  

Science Conference Proceedings (OSTI)

The effect of resolution on the depiction of central sea level pressure for an intense oceanic extratropical cyclone is examined through a one-dimensional Fourier analysis. Profiles of sea level pressure were manually interpolated along the ...

Patricia M. Pauley; Bradley J. Bramer

1992-05-01T23:59:59.000Z

354

Assimilation of Synthetic Tropical Cyclone Observations into the Navy Operational Global Atmospheric Prediction System  

Science Conference Proceedings (OSTI)

In June 1990, the assimilation of synthetic tropical cyclone observations into the Navy Operational Global Atmospheric Prediction System (NOGAPS) was initiated at Fleet Numerical Oceanography Center (FNOC). These observations are derived directly ...

James S. Goerss; Richard A. Jeffries

1994-12-01T23:59:59.000Z

355

Tropical Cyclone Intensity Increase near Australia as a Result of Climate Change  

Science Conference Proceedings (OSTI)

Idealized tropical cyclones are inserted into a regional climate model and the resulting intensity evolution of the storms is examined under current and enhanced greenhouse climates. The regional climate model is implemented over a model domain ...

Kevin J. E. Walsh; Brian F. Ryan

2000-08-01T23:59:59.000Z

356

An Examination of the Pressure–Wind Relationship for Intense Tropical Cyclones  

Science Conference Proceedings (OSTI)

In this study, the dynamical constraints underlining the pressure–wind relationship (PWR) for intense tropical cyclones (TCs) are examined with the particular focus on the physical connections between the maximum surface wind (VMAX) and the ...

Chanh Q. Kieu; Hua Chen; Da-Lin Zhang

2010-06-01T23:59:59.000Z

357

Quantifying Interagency Differences in Tropical Cyclone Best-Track Wind Speed Estimates  

Science Conference Proceedings (OSTI)

Numerous agencies around the world perform postseason analysis of tropical cyclone position and intensity, a process described as “best tracking.” However, this process is temporally and spatially inhomogeneous because data availability, ...

Kenneth R. Knapp; Michael C. Kruk

2010-04-01T23:59:59.000Z

358

An Automated, Objective, Multiple-Satellite-Platform Tropical Cyclone Surface Wind Analysis  

Science Conference Proceedings (OSTI)

A method to estimate objectively the surface wind fields associated with tropical cyclones using only data from multiple satellite platforms and satellite-based wind retrieval techniques is described. The analyses are computed on a polar grid ...

John A. Knaff; Mark DeMaria; Debra A. Molenar; Charles R. Sampson; Matthew G. Seybold

2011-10-01T23:59:59.000Z

359

Trend Analysis with a New Global Record of Tropical Cyclone Intensity  

Science Conference Proceedings (OSTI)

The historical global “best-track” records of tropical cyclones extend back to the mid-19th century in some regions, but formal analysis of these records is encumbered by temporal heterogeneities in the data. This is particularly problematic when ...

James P. Kossin; Timothy L. Olander; Kenneth R. Knapp

360

Tropical Cyclone-like Vortices in a Limited Area Model: Comparison with Observed Climatology  

Science Conference Proceedings (OSTI)

A climate simulation of a limited area model implemented over the Australian region is analyzed for the presence of low pressure systems that have some of the physical characteristics of tropical cyclones. The model is run at a horizontal ...

Kevin Walsh; Ian G. Watterson

1997-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Influence of Synoptic Track Aircraft Reconnaissance on JTWC Tropical Cyclone Track Forecast Errors  

Science Conference Proceedings (OSTI)

This report examines the impact of synoptic reconnaissance by United States Air Force aircraft on the accuracy of tropical cyclone motion forecasts. Synoptic reconnaissance missions were requested for the purpose of collecting data on atmospheric ...

Daniel N. Shoemaker; William M. Gray; John D. Sheaffer

1990-09-01T23:59:59.000Z

362

A Satellite Observational Study of Precipitation Characteristics in Western North Pacific Tropical Cyclones  

Science Conference Proceedings (OSTI)

Special Sensor Microwave/Imager (SSM/I) observations were used to examine spatial and temporal changes in the precipitation characteristics for western North Pacific tropical cyclones that reached storm stage or greater during 1987-92. The second ...

Edward B. Rodgers; Harold F. Pierce

1995-12-01T23:59:59.000Z

363

Assessment of the Role of Aircraft Reconnaissance on Tropical Cyclone Analysis and Forecasting  

Science Conference Proceedings (OSTI)

The impact of aircraft reconnaissance on tropical cyclone (TC) observation and forecasting is assessed. The motivation for this assessment is the termination of Department of Defense (DOD) aircraft reconnaissance in the northwest Pacific in 1987 ...

William M. Gray; Charles Neumann; Ted L. Tsui

1991-12-01T23:59:59.000Z

364

Observational Analyses of North Atlantic Tropical Cyclones from NOAA Polar-Orbiting Satellite Microwave Data  

Science Conference Proceedings (OSTI)

Passive microwave observations from the current NOAA series of polar-orbiting satellites of a large sample of North Atlantic tropical cyclones are qualitatively and quantitatively analyzed. Microwave observations can penetrate the cloud cover ...

Christopher S. Velden

1989-01-01T23:59:59.000Z

365

Observational Evidence for Predictions of Tropical Cyclone Propagation Relative to Environmental Steering  

Science Conference Proceedings (OSTI)

Theories of vortex motion due to the variations of the Coriolis parameter and environmental vorticity are compared to observations of tropical cyclone motion relative to computed “steering flows” using previously published composite data. The ...

L. E. Carr III; Russell L. Elsberry

1990-02-01T23:59:59.000Z

366

Environmental Flow Impacts on Tropical Cyclone Structure Diagnosed from Airborne Doppler Radar Composites  

Science Conference Proceedings (OSTI)

Following a recent demonstration of multicase compositing of axisymmetric tropical cyclone (TC) structure derived from airborne Doppler radar measurements, the authors extend the analysis to the asymmetric structure using an unprecedented database ...

Paul D. Reasor; Robert Rogers; Sylvie Lorsolo

2013-09-01T23:59:59.000Z

367

Evaluation of a Wind-Wave System for Ensemble Tropical Cyclone Wave Forecasting. Part I: Winds  

Science Conference Proceedings (OSTI)

A computationally efficient method of producing tropical cyclone (TC) wind analyses is developed and tested, using a hindcast methodology, for 12 Gulf of Mexico storms. The analyses are created by blending synthetic data, generated from a simple ...

Steven M. Lazarus; Samuel T. Wilson; Michael E. Splitt; Gary A. Zarillo

2013-04-01T23:59:59.000Z

368

The tropical cyclone-induced flux of carbon between the ocean and the atmosphere  

E-Print Network (OSTI)

Tropical cyclones are known to cause phytoplankton blooms in regions of the ocean that would otherwise support very little life; it is also known that these storms entrain carbon-rich deep water, which can cause ...

Zimmerman, Neil L

2012-01-01T23:59:59.000Z

369

Evaluation of a Wind-Wave System for Ensemble Tropical Cyclone Wave Forecasting. Part II: Waves  

Science Conference Proceedings (OSTI)

A wind-wave forecast system, designed with the intention of generating unbiased ensemble wave forecasts for extreme wind events, is assessed. Wave hindcasts for 12 tropical cyclones (TCs) are forced using a wind analysis produced from a ...

Steven M. Lazarus; Samuel T. Wilson; Michael E. Splitt; Gary A. Zarillo

2013-04-01T23:59:59.000Z

370

Mesoscale Generation of Available Potential Energy in the Warm Sector of an Extratropical Cyclone  

Science Conference Proceedings (OSTI)

Generation of available potential energy (APE) is computed for the warm sector of an extratropical cyclone containing intense convection. Three hourly mesoscale rawinsonde data from the 10–11 April day of AVESESAME 1979 are used to evaluate ...

Henry E. Fuelberg; Mark G. Ruminski; David O'C. Starr

1985-07-01T23:59:59.000Z

371

Objectively Determining the Rotational Center of Tropical Cyclones in Passive Microwave Satellite Imagery  

Science Conference Proceedings (OSTI)

Precise center-fixing of tropical cyclones (TCs) is critical for operational forecasting, intensity estimation, and visualization. Current procedures are usually performed with manual input from a human analyst, using multispectral satellite ...

Anthony J. Wimmers; Christopher S. Velden

2010-09-01T23:59:59.000Z

372

Extreme rainfall intensities and long-term rainfall risk from tropical cyclones  

E-Print Network (OSTI)

We develop a methodology for the frequency of extreme rainfall intensities caused by tropical cyclones (TCs) in coastal areas. The mean rainfall field associated with a TC with maximum tangential wind speed Vmax, radius ...

Langousis, Andreas, 1981-

2009-01-01T23:59:59.000Z

373

Multigrid Solution of an Elliptic Boundary Value Problem from Tropical Cyclone Theory  

Science Conference Proceedings (OSTI)

We consider the multigrid solution of the transverse circulation equation for a tropical cyclone. First we develop a standard multigrid scheme (SMG) which cycles between different levels of discretization (grids) to efficiently reduce the error ...

Paul E. Ciesielski; Scott R. Fulton; Wayne H. Schubert

1986-05-01T23:59:59.000Z

374

A Family of Frontal Cyclones over the Western Atlantic Ocean. Part I: A 60-h Simulation  

Science Conference Proceedings (OSTI)

Despite marked improvements in the predictability of rapidly deepening extratropical cyclones, many operational models still have great difficulties in predicting frontal cyclogenesis that often begins as a mesoscale vortex embedded in a large-...

Da-Lin Zhang; Ekaterina Radeva; John Gyakum

1999-08-01T23:59:59.000Z

375

Spatially Inhomogeneous Trends of Tropical Cyclone Intensity over the Western North Pacific for 1977–2010  

Science Conference Proceedings (OSTI)

The spatial distribution of trends in tropical cyclone (TC) intensity over the western North Pacific Ocean (WNP) during the period 1977–2010 was examined using five TC datasets. The spatial distribution of the TC intensity was expressed by ...

Doo-Sun R. Park; Chang-Hoi Ho; Joo-Hong Kim; Hyeong-Seog Kim

2013-07-01T23:59:59.000Z

376

Moisture Origin and Meridional Transport in Atmospheric Rivers and Their Association with Multiple Cyclones  

Science Conference Proceedings (OSTI)

During December 2006 many cyclones traveled across the North Atlantic, causing temperature and precipitation in Norway to be well above average. Large excursions of high vertically integrated water vapor, often referred to as atmospheric rivers, ...

Harald Sodemann; Andreas Stohl

2013-08-01T23:59:59.000Z

377

Polarimetric Radar Observations of the Persistently Asymmetric Structure of Tropical Cyclone Ingrid  

Science Conference Proceedings (OSTI)

Tropical Cyclone Ingrid had a distinctly asymmetric reflectivity structure with an offshore maximum as it passed parallel to and over an extended coastline near a polarimetric weather radar located near Darwin, northern Australia. For the first ...

Peter T. May; J. D. Kepert; T. D. Keenan

2008-02-01T23:59:59.000Z

378

Reduction of Tropical Cyclone Position Errors Using an Optimal Combination of Independent Forecasts  

Science Conference Proceedings (OSTI)

It is shown that an optimal linear combination of independent forecasts of tropical cyclone tracks significantly reduces the mean forecast-position errors. In this study the independent forecasts are provided by a statistical scheme (CLIPER) and ...

Lance M. Leslie; Klaus Fraedrich

1990-03-01T23:59:59.000Z

379

Predictability of 500 mb Cyclones and Anticyclones and Anticyclones as a Function of Their Persistence  

Science Conference Proceedings (OSTI)

Errors in the National Meteorological Center's 72 h spectral model predictions of 500 mb cyclones and anticyclones during the 1983/84 cool season and during the autumn of 1987 are stratified according to the observed duration of the forecast ...

T. Kelly Ceppa; Stephen J. Colucci

1989-04-01T23:59:59.000Z

380

Processes Leading to the Formation of Mesoscale Waves in the Midwest Cyclone of 15 December 1987  

Science Conference Proceedings (OSTI)

On 15 December 1987, several long-lived, large-amplitude mesoscale wave disturbances accompanied a rapidly developing extratropical cyclone in the midwest United States. Previous observational and modeling studies have suggested that the ...

Peter J. Pokrandt; Gregory J. Tripoli; David D. Houghton

1996-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

A Theory for Mixed Vortex Rossby–Gravity Waves in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Vortex–Rossby waves (VRWs) and inertial gravity waves (IGWs) have been proposed to explain the propagation of spiral rainbands and the development of dynamical instability in tropical cyclones (TCs). In this study, a theory for mixed vortex–...

Wei Zhong; Da-Lin Zhang; Han-Cheng Lu

2009-11-01T23:59:59.000Z

382

Mesoscale Cyclone Activity over the Ice-Free Southern Ocean: 1999–2008  

Science Conference Proceedings (OSTI)

Mesoscale cyclones play an important role in the weather and climate of the Southern Hemisphere (SH) mid-to-high latitudes. However, the relatively small size and short lifetime of these systems, combined with the lack of available conventional ...

Damien Irving; Ian Simmonds; Kevin Keay

2010-10-01T23:59:59.000Z

383

A Forecast Strategy for Anticipating Cold Season Mesoscale Band Formation within Eastern U.S. Cyclones  

Science Conference Proceedings (OSTI)

An ingredients-based, time- and scale-dependent forecast strategy for anticipating cold season mesoscale band formation within eastern U.S. cyclones is presented. This strategy draws on emerging conceptual models of mesoscale band development, ...

David R. Novak; Jeff S. Waldstreicher; Daniel Keyser; Lance F. Bosart

2006-02-01T23:59:59.000Z

384

Large-Amplitude Mesoscale Wave Disturbances Within the Intense Midwest Extratropical Cyclone of 15 December 1987  

Science Conference Proceedings (OSTI)

On 15 December 1987 several long-lived, large-amplitude mesoscale wave disturbances embedded within a rapidly intensifying extratropical cyclone traversed the Midwest and created life-threatening blizzard conditions. Within the wave disturbances, ...

Russell S. Schneider

1990-12-01T23:59:59.000Z

385

Numerical Simulations and Observations of Surface Wave Fields under an Extreme Tropical Cyclone  

Science Conference Proceedings (OSTI)

The performance of the wave model WAVEWATCH III under a very strong, category 5, tropical cyclone wind forcing is investigated with different drag coefficient parameterizations and ocean current inputs. The model results are compared with field ...

Yalin Fan; Isaac Ginis; Tetsu Hara; C. Wayne Wright; Edward J. Walsh

2009-09-01T23:59:59.000Z

386

The Mechanical Energy Input to the Ocean Induced by Tropical Cyclones  

Science Conference Proceedings (OSTI)

Wind stress and tidal dissipation are the most important sources of mechanical energy for maintaining the oceanic general circulation. The contribution of mechanical energy due to tropical cyclones can be a vitally important factor in regulating ...

Ling Ling Liu; Wei Wang; Rui Xin Huang

2008-06-01T23:59:59.000Z

387

Tropical Cyclone–Induced Upper-Ocean Mixing and Climate: Application to Equable Climates  

Science Conference Proceedings (OSTI)

Tropical cyclones instigate an isolated blast of vigorous mixing in the upper tropical oceans, stirring warm surface water with cooler water in the thermocline. Previous work suggests that the frequency, intensity, and lifetime of these storms ...

Robert L. Korty; Kerry A. Emanuel; Jeffery R. Scott

2008-02-01T23:59:59.000Z

388

Initial Results From The Navy Two-Way Interactive Nested Tropical Cyclone Model  

Science Conference Proceedings (OSTI)

A primitive equation, two-way interactive nested tropical cyclone model has been developed by the Naval Environmental Prediction Research Facility for operational use during the 1980 typhoon season. The fine mesh grid of the model operates ...

Edward J. Harrison Jr.

1981-01-01T23:59:59.000Z

389

Generation of Moist Potential Vorticity in Extratropical Cyclones. Part II: Sensitivity to Moisture Distribution  

Science Conference Proceedings (OSTI)

The effects of different moisture distributions on the generation of moist potential vorticity (MPV) in extratropical cyclones are examined by numerical simulations. These sensitivity experiments show that low-level negative MPV generation ...

Han-Ru Cho; Zuohao Cao

1998-02-01T23:59:59.000Z

390

Storm-Relative Observations in Tropical Cyclone Data Assimilation with an Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

A storm-relative data assimilation method for tropical cyclones is introduced for the ensemble Kalman filter, using the Hurricane Weather Research and Forecasting (HWRF) Ensemble Data Assimilation System (HEDAS) developed at the Hurricane Research ...

Altu? Aksoy

2013-02-01T23:59:59.000Z

391

The Maximum Intensity of Tropical Cyclones in Axisymmetric Numerical Model Simulations  

Science Conference Proceedings (OSTI)

An axisymmetric numerical model is used to evaluate the maximum possible intensity of tropical cyclones. As compared with traditionally formulated nonhydrostatic models, this new model has improved mass and energy conservation in saturated ...

George H. Bryan; Richard Rotunno

2009-06-01T23:59:59.000Z

392

Impacts of Air–Sea Flux Parameterizations on the Intensity and Structure of Tropical Cyclones  

Science Conference Proceedings (OSTI)

Fluxes of momentum and moist enthalpy across the air–sea interface are believed to be one of the most important factors in determining tropical cyclone intensity. Because these surface fluxes cannot be directly resolved by numerical weather ...

Benjamin W. Green; Fuqing Zhang

2013-07-01T23:59:59.000Z

393

MIMIC: A New Approach to Visualizing Satellite Microwave Imagery of Tropical Cyclones  

Science Conference Proceedings (OSTI)

Satellite-based passive microwave imagery of tropical cyclones (TCs) is an invaluable resource for assessing the organization and evolution of convective structures in TCs when often no other comparable observations exist. However, the current ...

Anthony J. Wimmers; Christopher S. Velden

2007-08-01T23:59:59.000Z

394

The Physical Oceanography of Two Rings Observed by the Cyclonic Ring Experiment. Part I: Physical Structures  

Science Conference Proceedings (OSTI)

Eight cruises over a 10-month period in the North Atlantic have provided the Cyclonic Ring Experiment with observations of two rings. Life histories, structure and structural changes have been studied with emphasis on the effects of Stream ...

Andrew C. Vastano; Joyce E. Schmitz; Denise E. Hagan

1980-04-01T23:59:59.000Z

395

A Vortex-Based Perspective of Eastern Pacific Tropical Cyclone Formation  

Science Conference Proceedings (OSTI)

Tropical cyclone formation over the eastern Pacific during 2005 and 2006 was examined using primarily global operational analyses from the National Centers for Environmental Prediction. This paper represents a “vortex view” of genesis, adding to ...

Christopher Davis; Chris Snyder; Anthony C. Didlake Jr.

2008-07-01T23:59:59.000Z

396

IMILAST: A Community Effort to Intercompare Extratropical Cyclone Detection and Tracking Algorithms  

Science Conference Proceedings (OSTI)

The variability of results from different automated methods of detection and tracking of extratropical cyclones is assessed in order to identify uncertainties related to the choice of method. Fifteen international teams applied their own algorithms to the ...

Urs Neu; Mirseid G. Akperov; Nina Bellenbaum; Rasmus Benestad; Richard Blender; Rodrigo Caballero; Angela Cocozza; Helen F. Dacre; Yang Feng; Klaus Fraedrich; Jens Grieger; Sergey Gulev; John Hanley; Tim Hewson; Masaru Inatsu; Kevin Keay; Sarah F. Kew; Ina Kindem; Gregor C. Leckebusch; Margarida L. R. Liberato; Piero Lionello; Igor I. Mokhov; Joaquim G. Pinto; Christoph C. Raible; Marco Reale; Irina Rudeva; Mareike Schuster; Ian Simmonds; Mark Sinclair; Michael Sprenger; Natalia D. Tilinina; Isabel F. Trigo; Sven Ulbrich; Uwe Ulbrich; Xiaolan L. Wang; Heini Wernli

2013-04-01T23:59:59.000Z

397

Influence of model biases on projected future changes in tropical cyclone frequency of occurrence  

Science Conference Proceedings (OSTI)

The influence of model biases on projected future changes in the frequency of occurrence of tropical cyclones (FOCs) was investigated using a new empirical statistical method. Assessments were made of present-day (1979–2003) simulations and future ...

Hiroyuki Murakami; Pang-Chi Hsu; Osamu Arakawa; Tim Li

398

Observations of Record Cold Cloud-Top Temperatures in Tropical Cyclone Hilda (1990)  

Science Conference Proceedings (OSTI)

A detailed analysis is made of the development of a region of cold cloud-top temperatures in Tropical Cyclone Hilda (1990) in the Coral Sea off eastern Australia. Observed temperatures of approximately 173 K (?100°C) from two independent ...

Elizabeth E. Ebert; Greg J. Holland

1992-10-01T23:59:59.000Z

399

Necessary Conditions for Tropical Cyclone Rapid Intensification as Derived from 11 Years of TRMM Data  

Science Conference Proceedings (OSTI)

Rainfall and convective properties of tropical cyclones (TCs) are statistically quantified for different TC intensity change categories by using Tropical Rainfall Measuring Mission (TRMM) data from December 1997 to December 2008. Four 24-h future ...

Haiyan Jiang; Ellen M. Ramirez

400

Modulation of Western North Pacific Tropical Cyclone Activity by the ISO. Part I: Genesis and Intensity  

Science Conference Proceedings (OSTI)

This study investigates the intraseasonal variability of tropical cyclones (TCs) by systematically examining the two major components of the intraseasonal oscillation (ISO), the 30–60-day Madden–Julian oscillation (MJO) and the 10–20-day quasi-...

Richard C. Y. Li; Wen Zhou

2013-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

A Composite Analysis of Airstreams within Cold-Season Colorado Cyclones  

Science Conference Proceedings (OSTI)

Relative wind isentropic analysis was employed to investigate the evolution of airstreams and airstream boundaries within midlatitude cyclones that formed in the Colorado cyclogenesis region of the United States. This study attempts to verify and ...

Gregory D. Bierly; Julie A. Winkler

2001-02-01T23:59:59.000Z

402

Latent Heat Release in an Extratropical Cyclone that Developed Explosively over the Southeastern United States  

Science Conference Proceedings (OSTI)

Using the Goddard Laboratory for Atmospheres FGGE Level III-b analyses, the latent heat release (LHR) associated with an extratropical cyclone that deepened explosively over the southeastern United States is investigated. Parameterized LUR was ...

Earl K. Fosdick; Phillip J. Smith

1991-01-01T23:59:59.000Z

403

Static Stability Variations during the Development of an Intense Extratropical Cyclone  

Science Conference Proceedings (OSTI)

The role of static stability (?) is diagnosed for an intense extratropical cyclone that developed over the central United States during 9–11 January 1975. Results indicate that minimum ?, values occurred in the lower troposphere at 0000 UTC 10 ...

Philip J. Smith; Chih-Hua Tsou

1988-05-01T23:59:59.000Z

404

A History of Western North Pacific Tropical Cyclone Track Forecast Skill  

Science Conference Proceedings (OSTI)

The tropical cyclone (TC) track forecasting skill of operational numerical weather prediction (NWP) models and their consensus is examined for the western North Pacific from 1992 to 2002. The TC track forecasting skill of the operational NWP ...

James S. Goerss; Charles R. Sampson; James M. Gross

2004-06-01T23:59:59.000Z

405

Gulf Stream and ENSO Increase the Temperature Sensitivity of Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

Controversy exists over the role of the recent rise in sea surface temperatures (SST) and the frequency of tropical cyclones or hurricanes. Here, 135 yr of observational records are used to demonstrate how sea surface temperature, sea level ...

J. C. Moore; A. Grinsted; S. Jevrejeva

2008-04-01T23:59:59.000Z

406

A Pressure-Based Analysis of the Historical Western North Pacific Tropical Cyclone Intensity Record  

Science Conference Proceedings (OSTI)

The western North Pacific Ocean is the most active tropical cyclone (TC) basin. However, recent studies are not conclusive on whether the TC activity is increasing or decreasing, at least when calculations are based on maximum sustained winds. For ...

Kenneth R. Knapp; John A. Knaff; Charles R. Sampson; Gustavo M. Riggio; Adam D. Schnapp

2013-08-01T23:59:59.000Z

407

Tropical Cyclone Prediction Using a Barotropic Model Initialized by a Generalized Inverse Method  

Science Conference Proceedings (OSTI)

A nested, nondivergent barotropic numerical weather prediction model for forecasting tropical cyclone motion out to 48 h is initialized at time t = 0 by assimilating data from the preceding 24 h. The assimilation scheme finds the generalized ...

A. F. Bennett; L. M. Leslie; C. R. Hagelberg; P. E. Powers

1993-06-01T23:59:59.000Z

408

Tropical cyclones and drought amelioration in the Gulf and Southeastern Coastal United States  

Science Conference Proceedings (OSTI)

Precipitation from land-falling tropical cyclones (TCs) has a significant hydroclimatic influence in the southeastern United States, particularly during drought years. The frequency with which TCs ended drought conditions was examined for ...

Justin T. Maxwell; Jason T. Ortegren; Paul A. Knapp; Peter T. Soulé

409

Cumulus Convection and CISK in Midlatitudes. Part II: Comma-Cloud Formation in Cyclonic Shear Regions  

Science Conference Proceedings (OSTI)

Observational studies show that polar air stream cyclones form preferentially to the north of the polar front in regions of high vorticity and low static stability, although the baroclinicity may be stronger elsewhere. This phenomenon is ...

George C. Craig; Han-Ru Cho

1992-08-01T23:59:59.000Z

410

An Analytic Vortex Initialization Technique for Idealized Tropical Cyclone Studies in AGCMs  

Science Conference Proceedings (OSTI)

The paper discusses the design of idealized tropical cyclone experiments in atmospheric general circulation models (AGCMs). The evolution of an initially weak, warm-core vortex is investigated over a 10-day period with varying initial conditions ...

Kevin A. Reed; Christiane Jablonowski

2011-02-01T23:59:59.000Z

411

Evolution of the Surface Wind Field in an Intensifying Tropical Cyclone  

Science Conference Proceedings (OSTI)

The surface wind field in a developing tropical cyclone (Agnes, 1972) was analyzed over a 1660 km radius for four days using conventional surface data, as the storm evolved from a disorganized depression to a hurricane. The transition to ...

John Molinari; Steven Skubis

1985-12-01T23:59:59.000Z

412

A novel multi-scale intensity metric for evaluation of tropical cyclone intensity forecasts  

Science Conference Proceedings (OSTI)

In this study, a new Multi-Scale Intensity (MSI) metric for evaluating Tropical Cyclone (TC) intensity forecasts is presented. The metric consists of the resolvable and observable, low wavenumber intensity represented by the sum of amplitudes of ...

Tomislava Vukicevic; Eric Uhlhorn; Paul Reasor; Bradley Klotz

413

Satellite-derived Surface Latent Heat Fluxes in a Rapidly Intensifying Marine Cyclone  

Science Conference Proceedings (OSTI)

The aim of this article is to estimate surface latent heat fluxes in the vicinity of a rapidly deepening cyclone before and during its period of most rapid intensification. This is done with a bulk parameterization scheme and remotely sensed ...

Douglas K. Miller; Kristina B. Katsaros

1992-07-01T23:59:59.000Z

414

Understanding and Forecasting Tropical Cyclone Intensity Change with the Typhoon Intensity Prediction Scheme (TIPS)  

Science Conference Proceedings (OSTI)

A multiple regression scheme with tropical cyclone intensity change as the dependent variable has been developed. The new scheme is titled the Typhoon Intensity Prediction Scheme (TIPS) and is similar to one used operationally at the National ...

Patrick J. Fitzpatrick

1997-12-01T23:59:59.000Z

415

Influence of ENSO on Tropical Cyclone Intensity in the Fiji Region  

Science Conference Proceedings (OSTI)

This study examines the variation in tropical cyclone (TC) intensity for different phases of the El Niño–Southern Oscillation (ENSO) phenomenon in the Fiji, Samoa, and Tonga (FST) region. The variation in TC intensity is inferred from the ...

Savin S. Chand; Kevin J. E. Walsh

2011-08-01T23:59:59.000Z

416

Evaluation of an Analytical Model for the Maximum Intensity of Tropical Cyclones  

Science Conference Proceedings (OSTI)

Several studies have shown that the intensity of numerically simulated tropical cyclones can exceed (by 50%) a theoretical upper limit. To investigate the cause, this study evaluates the underlying components of Emanuel’s commonly cited analytic ...

George H. Bryan; Richard Rotunno

2009-10-01T23:59:59.000Z

417

A Vortex Relocation Scheme for Tropical Cyclone Initialization in Advanced Research WRF  

Science Conference Proceedings (OSTI)

This paper introduces a relocation scheme for tropical cyclone (TC) initialization in the Advanced Research Weather Research and Forecasting (ARW-WRF) model and demonstrates its application to 70 forecasts of Typhoons Sinlaku (2008), Jangmi (2008)...

Ling-Feng Hsiao; Chi-Sann Liou; Tien-Chiang Yeh; Yong-Run Guo; Der-Song Chen; Kang-Ning Huang; Chuen-Teyr Terng; Jen-Her Chen

2010-08-01T23:59:59.000Z

418

A Relationship Between Acid Precipitation and Three-Dimensional Transport Associated with Synoptic-Scale Cyclones  

Science Conference Proceedings (OSTI)

Field data collected during APEX (Acid Precipitation Experiment) are used in combination with an isentropic trajectory model to analyze the relationship between acid precipitation and three-dimensional transport associated with cyclonic storms. ...

Philip L. Haggenson; Allan L. Lazrus; Ying-Hwa Kuo; Ginger A. Caldwell

1985-09-01T23:59:59.000Z

419

Global Ensemble Predictions of 2009’s Tropical Cyclones Initialized with an Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

Verification was performed on ensemble forecasts of 2009 Northern Hemisphere summer tropical cyclones (TCs) from two experimental global numerical weather prediction ensemble prediction systems (EPSs). The first model was a high-resolution ...

Thomas M. Hamill; Jeffrey S. Whitaker; Michael Fiorino; Stanley G. Benjamin

2011-02-01T23:59:59.000Z

420

Composite Analysis of North Atlantic Extratropical Cyclones in NCEP–NCAR Reanalysis Data  

Science Conference Proceedings (OSTI)

Composite analysis of North Atlantic midlatitudinal winter cyclones is performed using NCEP–NCAR reanalysis data for the 60-yr period from 1948 to 2007. The composites were developed using an advanced methodology involving the coordinate transform ...

Irina Rudeva; Sergey K. Gulev

2011-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Comparing Cyclone Life Cycle Characteristics and Their Interannual Variability in Different Reanalyses  

Science Conference Proceedings (OSTI)

Characteristics of Northern Hemisphere extratropical cyclone activity were compared for five concurrent reanalyses: the NCEP–U.S. Department of Energy (DOE) reanalysis (herein NCEP–DOE), the Japanese 25-year Reanalysis Project (JRA-25), the ECMWF ...

Natalia Tilinina; Sergey K. Gulev; Irina Rudeva; Peter Koltermann

2013-09-01T23:59:59.000Z

422

Tropical Cyclone Convection and Intensity Analysis Using Differenced Infrared and Water Vapor Imagery  

Science Conference Proceedings (OSTI)

A technique to identify and quantify intense convection in tropical cyclones (TCs) using bispectral, geostationary satellite imagery is explored. This technique involves differencing the water vapor (WV) and infrared window (IRW) channel ...

Timothy L. Olander; Christopher S. Velden

2009-12-01T23:59:59.000Z

423

The Development of a Cyclone–Anticyclone Asymmetry within a Growing Baroclinic Wave  

Science Conference Proceedings (OSTI)

This study examines the cyclone–anticyclone asymmetry within idealized baroclinic waves. For this purpose a primitive equation (PE) model and a quasigeostrophic (QG) model are used. The Rossby number appears to be an essential external parameter ...

Thomas Frisius

2003-12-01T23:59:59.000Z

424

The Importance of Three Physical Processes in a Minimal Three-Dimensional Tropical Cyclone Model  

Science Conference Proceedings (OSTI)

The minimal three-dimensional tropical cyclone model developed by Zhu et al. is used to explore the role of shallow convection, precipitation-cooled downdrafts, and the vertical transport of momentum by deep convection on the dynamics of tropical ...

Hongyan Zhu; Roger K. Smith

2002-06-01T23:59:59.000Z

425

Vertical Structure of Tropical Cyclone Rainbands as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Ten years of data from the Tropical Rainfall Measurement Mission satellite’s Precipitation Radar (TRMM PR) show the vertical structure of tropical cyclone rainbands. Radar-echo statistics show that rainbands have a two-layered structure, with ...

Deanna A. Hence; Robert A. Houze Jr.

2012-09-01T23:59:59.000Z

426

Revised Prediction of Seasonal Atlantic Basin Tropical Cyclone Activity from 1 August  

Science Conference Proceedings (OSTI)

Predictions of the remainder of the season’s Atlantic basin tropical cyclone activity from 1 August have been issued by Gray and his colleagues at the Tropical Meteorology Project at Colorado State University since 1984. The original 1 August ...

Philip J. Klotzbach

2007-10-01T23:59:59.000Z

427

Revisiting the Influence of the Quasi-Biennial Oscillation on Tropical Cyclone Activity  

Science Conference Proceedings (OSTI)

The statistical relationship between the quasi-biennial oscillation (QBO) and tropical cyclone (TC) activity is explored, with a focus on the North Atlantic. Although there is a statistically significant relationship between the QBO and TCs in ...

Suzana J. Camargo; Adam H. Sobel

2010-11-01T23:59:59.000Z

428

Contributions of Barotropic Energy Conversion to Northwest Pacific Tropical Cyclone Activity during ENSO  

Science Conference Proceedings (OSTI)

The contribution of barotropic energy conversion to tropical cyclone (TC) activity over the western North Pacific (WNP) during warm and cold phases of El Niño–Southern Oscillation (ENSO) is investigated by separating TC vortices from reanalysis ...

Yao Ha; Zhong Zhong; Yimin Zhu; Yijia Hu

2013-04-01T23:59:59.000Z

429

The BMRC High-Resolution Tropical Cyclone Prediction System: TC-LAPS  

Science Conference Proceedings (OSTI)

A new Tropical Cyclone Limited Area Prediction System has been developed at the Australian Bureau of Meteorology Research Centre. The features of the new prediction system can be summarized as follows: first, a 12-h, coarse-resolution data ...

Noel E. Davidson; Harry C. Weber

2000-05-01T23:59:59.000Z

430

The Life Cycle of a Simulated Marine Cyclone: Energetics and PV Diagnostics  

Science Conference Proceedings (OSTI)

The life cycle of an intense marine cyclone is documented in this paper. The departure of the moist dynamics from the dry baroclinic dynamics is explored from an energetics point of view. The contributions of various physical processes through ...

G. Balasubramanian; M. K. Yau

1996-02-01T23:59:59.000Z

431

A Local Energetics Analysis of the Life Cycle Differences between Consecutive, Explosively Deepening, Continental Cyclones  

Science Conference Proceedings (OSTI)

Local energetics diagnostics of the life cycles of consecutive, explosively deepening, extratropical cyclones that migrated across central North America in April 2001 are presented. Both storms developed rapidly and followed nearly identical ...

Steven G. Decker; Jonathan E. Martin

2005-01-01T23:59:59.000Z

432

Variations in Tropical Cyclone Genesis Factors in Simulations of the Holocene Epoch  

Science Conference Proceedings (OSTI)

The thermodynamic factors related to tropical cyclone genesis are examined in several simulations of the middle part of the Holocene epoch when the precession of Earth’s orbit altered the seasonal distribution of solar radiation and in one ...

Robert L. Korty; Suzana J. Camargo; Joseph Galewsky

2012-12-01T23:59:59.000Z

433

The Role of Terrain and Pressure Stresses in Rocky Mountain Lee Cyclones  

Science Conference Proceedings (OSTI)

The earth–atmosphere exchange of storm absolute dynamic circulation by mountain-induced surface pressure stress and the response of the circulation in a Rocky Mountain Ice cyclone is examined. Surface pressure stresses that transfer horizontal ...

Alan C. Czarnetzki; Donald R. Johnson

1996-04-01T23:59:59.000Z

434

Improving Ocean Model Initialization for Coupled Tropical Cyclone Forecast Models Using GODAE Nowcasts  

Science Conference Proceedings (OSTI)

To simulate tropical cyclone (TC) intensification, coupled ocean–atmosphere prediction models must realistically reproduce the magnitude and pattern of storm-forced sea surface temperature (SST) cooling. The potential for the ocean to support ...

G. R. Halliwell Jr.; L. K. Shay; S. D. Jacob; O. M. Smedstad; E. W. Uhlhorn

2008-07-01T23:59:59.000Z

435

A Hypothesis for the Redevelopment of Warm-Core Cyclones over Northern Australia  

Science Conference Proceedings (OSTI)

Tropical cyclones moving inland over northern Australia are occasionally observed to reintensify, even in the absence of well-defined extratropical systems. Unlike cases of classical extratropical rejuvenation, such reintensifying storms retain ...

Kerry Emanuel; Jeff Callaghan; Peter Otto

2008-10-01T23:59:59.000Z

436

Tropical Cyclone Climatology in a 10-km Global Atmospheric GCM: Toward Weather-Resolving Climate Modeling  

Science Conference Proceedings (OSTI)

Northern Hemisphere tropical cyclone (TC) activity is investigated in multiyear global climate simulations with the ECMWF Integrated Forecast System (IFS) at 10-km resolution forced by the observed records of sea surface temperature and sea ice. ...

Julia V. Manganello; Kevin I. Hodges; James L. Kinter III; Benjamin A. Cash; Lawrence Marx; Thomas Jung; Deepthi Achuthavarier; Jennifer M. Adams; Eric L. Altshuler; Bohua Huang; Emilia K. Jin; Cristiana Stan; Peter Towers; Nils Wedi

2012-06-01T23:59:59.000Z

437

Observations of Mesoscale Circulations within Extratropical Cyclones over the North Atlantic Ocean during ERICA  

Science Conference Proceedings (OSTI)

Pseudo-dual-Doppler analyses of two mesoscale circulations (20–40 km in horizontal dimensions) that formed along a warm front within a rapidly deepening extratropical cyclone over the ocean are presented. The circulations were analyzed using ...

Ching-Hwang Liu; Roger M. Wakimoto; Frank Roux

1997-03-01T23:59:59.000Z

438

Dynamical and Physical Processes Leading to Tropical Cyclone Intensification under Upper-Level Trough Forcing  

Science Conference Proceedings (OSTI)

The rapid intensification of Tropical Cyclone (TC) Dora (2007, southwest Indian Ocean) under upper-level trough forcing is investigated. TC–trough interaction is simulated using a limited-area operational numerical weather prediction model. The ...

Marie-Dominique Leroux; Matthieu Plu; David Barbary; Frank Roux; Philippe Arbogast

2013-08-01T23:59:59.000Z

439

Restratification of the Upper Ocean after the Passage of a Tropical Cyclone: A Numerical Study  

Science Conference Proceedings (OSTI)

The role of baroclinic instability in the restratification of the upper ocean after the passage of a tropical cyclone (TC) is determined by means of numerical simulations. Using a regional ocean model, the Regional Ocean Modeling System (ROMS), a ...

Wei Mei; Claudia Pasquero

2012-09-01T23:59:59.000Z

440

International Experiments to Study Tropical Cyclones in the Western North Pacific  

Science Conference Proceedings (OSTI)

Four separate (but coincident in time) field experiments to study tropical cyclones in the western North Pacific area will be carried out during August/September 1990 by the United States, the Economic and Social Commission for Asia and the ...

Russell L. Elsberry

1990-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

The Role of Mesoscale Features in a Wintertime Great Lakes Cyclone  

Science Conference Proceedings (OSTI)

An analysis documenting the role of synoptic and surface mesoscale features in a cyclone has been conducted to determine the physical processes responsible for a large snowfall observed over south-central Wisconsin on 25 January 1988. Synoptic ...

Steven R. Silberberg

1990-03-01T23:59:59.000Z

442

Tropical Cyclone Motion and Surrounding Flow Relationships: Searching for Beta Gyres in Omega Dropwindsonde Datasets  

Science Conference Proceedings (OSTI)

In 1982, the National Oceanic and Atmospheric Administration's Hurricane Research Division began a series of experiments to collect Omega dropwindsonde (ODW) observations within about 1000 km of the center of tropical cyclones. By 1992, 16 ODW ...

James L. Franklin; Steven E. Feuer; John Kaplan; Sim D. Aberson

1996-01-01T23:59:59.000Z

443

Toward improved tropical cyclone intensity forecasts : probabilistic prediction, predictability, and the role of verification  

E-Print Network (OSTI)

Over the past two decades, deterministic predictions of tropical cyclone (TC) intensity consistently scored poorly in mean absolute error (MAE) verification, despite the concurrent advancement of TC modeling and observing ...

Moskaitis, Jonathan Robert

2009-01-01T23:59:59.000Z

444

Seasonal Prediction of Tropical Cyclone Activity Near Taiwan Using the Bayesian Multivariate Regression Method  

Science Conference Proceedings (OSTI)

A Poisson generalized linear regression model cast within a Bayesian framework is applied to forecast the seasonal tropical cyclone (TC) counts in the vicinity of Taiwan. The TC season considered is June–November and the data period used for ...

Mong-Ming Lu; Pao-Shin Chu; Yun-Ching Lin

2010-12-01T23:59:59.000Z

445

Objective Debiasing for Improved Forecasting of Tropical Cyclone Intensity with a Global Circulation Model  

Science Conference Proceedings (OSTI)

The damage potential of a tropical cyclone is proportional to a power (generally greater than one) of intensity, which demands high accuracy in forecasting intensity for managing this natural disaster. However, the current skill in forecasting ...

P. Goswami; S. Mallick; K. C. Gouda

2011-08-01T23:59:59.000Z

446

The Kinetic Energy Budgets of Two Severe Storm Producing Extratropical Cyclones  

Science Conference Proceedings (OSTI)

Eulerian kinetic energy budgets for the synoptic-scale flow over North America were computed for two cases of cyclone development associated with severe prefrontal convection. Horizontal flux convergence constitutes the major energy source in ...

Franklin R. Robertson; Phillip J. Smith

1980-02-01T23:59:59.000Z

447

Tropical Indian Ocean Influence on Northwest Pacific Tropical Cyclones in Summer following Strong El Niño  

Science Conference Proceedings (OSTI)

In the summer following a strong El Niño, tropical cyclone (TC) number decreases over the Northwest (NW) Pacific despite little change in local sea surface temperature. The authors’ analysis suggests El Niño–induced tropical Indian Ocean (TIO) ...

Yan Du; Lei Yang; Shang-Ping Xie

2011-01-01T23:59:59.000Z

448

The Effect of Internally Generated Inner-Core Asymmetries on Tropical Cyclone Potential Intensity  

Science Conference Proceedings (OSTI)

In a quiescent environment on an f plane, the internal dynamic processes of a tropical cyclone (TC) can generate axially asymmetric circulations (asymmetries) in its inner-core region. The present study investigates how these inner-core ...

Bo Yang; Yuqing Wang; Bin Wang

2007-04-01T23:59:59.000Z

449

Association Rule Data Mining Applications for Atlantic Tropical Cyclone Intensity Changes  

Science Conference Proceedings (OSTI)

This study applies a data mining technique called association rule mining to the analysis of intensity changes of North Atlantic tropical cyclones (TCs). The “best track” data from the National Hurricane Center and the Statistical Hurricane ...

Ruixin Yang; Jiang Tang; Donglian Sun

2011-06-01T23:59:59.000Z

450

Ensemble Forecasting of Tropical Cyclone Motion Using a Barotropic Model. Part II: Perturbations of the Vortex  

Science Conference Proceedings (OSTI)

In Part I of this study, the technique of ensemble forecasting is applied to the problem of tropical cyclone motion prediction by perturbing the environmental flow. In this part, the focus is shifted to perturbation of the vortex structure. The ...

Kevin K. W. Cheung; Johnny C. L. Chan

1999-11-01T23:59:59.000Z

451

Inactive Period of Western North Pacific Tropical Cyclone Activity in 1998–2011  

Science Conference Proceedings (OSTI)

Tropical cyclone (TC) activity over the western North Pacific (WNP) exhibits a significant interdecadal variation during 1960–2011, with two distinct active and inactive periods each. This study examines changes in TC activity and atmospheric ...

Kin Sik Liu; Johnny C. L. Chan

2013-04-01T23:59:59.000Z

452

The Experiment on Rapidly Intensifying cyclones over the Atlantic (ERICA) Field Study: Objectives and Plans  

Science Conference Proceedings (OSTI)

The Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA) field study is designed to determine physical mechanisms and processes, and their critical spatial and temporal combinations, which can account for the wintertime ...

Ron Hadlock; Carl W. Kreitzberg

1988-11-01T23:59:59.000Z

453

A pressure-based analysis of the historical western North Pacific tropical cyclone intensity record  

Science Conference Proceedings (OSTI)

The western North Pacific Ocean is the most active tropical cyclone (TC) basin. However, recent studies are not conclusive on whether the TC activity is increasing or decreasing, at least when calculations are based on maximum sustained winds. For ...

Kenneth R. Knapp; John A. Knaff; Charles R. Sampson; Gustavo M. Riggio; Adam D. Schnapp

454

Joint Typhoon Warning Center and the Challenges of Multibasin Tropical Cyclone Forecasting  

Science Conference Proceedings (OSTI)

The Joint Typhoon Warning Center (JTWC), a specialized component of the Naval Oceanography Command Center, Guam, is the busiest tropical cyclone warning center in the world. Its area of responsibility encompasses four broad oceanic areas of ...

Charles P. Guard; Lester E. Carr; Frank H. Wells; Richard A. Jeffries; Nicholas D. Gural; Dianne K. Edson

1992-06-01T23:59:59.000Z

455

Tropical Cyclone Formation Guidance Using Pregenesis Dvorak Climatology. Part I: Operational Forecasting and Predictive Potential  

Science Conference Proceedings (OSTI)

While there are a variety of modes for tropical cyclone (TC) development, there have been relatively few efforts to systematically catalog both nondeveloping and developing cases. This paper introduces an operationally derived climatology of ...

Joshua H. Cossuth; Richard D. Knabb; Daniel P. Brown; Robert E. Hart

2013-02-01T23:59:59.000Z

456

Satellite Observations of Variations in Tropical Cyclone Convection Caused by Upper-Tropospheric Troughs  

Science Conference Proceedings (OSTI)

The mutual adjustment between upper-tropospheric troughs and the structure of western Atlantic Tropical Cyclones Florence (1988) and Irene (1981) are analyzed using satellite and in situ data. Satellite-observed tracers (e.g., cirrus clouds, ...

Edward B. Rodgers; Simon W. Chang; John Stout; Joseph Steranka; Jainn-Jong Shi

1991-08-01T23:59:59.000Z

457

Reliability Analysis of Climate Change of Tropical Cyclone Activity over the Western North Pacific  

Science Conference Proceedings (OSTI)

Data homogeneity has become a significant issue in the study of tropical cyclones (TCs) and climate change. In this study, three historical datasets for the western North Pacific TCs from the Joint Typhoon Warning Center (JTWC), Japan ...

Fumin Ren; Jin Liang; Guoxiong Wu; Wenjie Dong; Xiuqun Yang

2011-11-01T23:59:59.000Z

458

Current Capability of Operational Numerical Models in Predicting Tropical Cyclone Intensity in the Western North Pacific  

Science Conference Proceedings (OSTI)

Forecasts of tropical cyclone (TC) intensity from six operational models (three global models and three regional models) during 2010 and 2011 are assessed to study the current capability of model guidance in the western North Pacific. The ...

Hui Yu; Peiyan Chen; Qingqing Li; Bi Tang

2013-04-01T23:59:59.000Z

459

Initial Condition Sensitivity and Predictability of a Severe Extratropical Cyclone Using a Moist Adjoint  

Science Conference Proceedings (OSTI)

The sensitivity and predictability of a rapidly-developing extratropical cyclone, ‘Xynthia’, that had a severe impact on Europe is explored using a high-resolution moist adjoint modeling system. The adjoint diagnostics indicate that the intensity ...

James D. Doyle; Clark Amerault; Carolyn A. Reynolds; P. Alex Reinecke

460

The Role of Antecedent Surface Vorticity Development as a Conditioning Process in Explosive Cyclone Intensification  

Science Conference Proceedings (OSTI)

We examine the idea that antecedent vorticity development, defined as the surface vorticity spinup in the period prior to a cyclone's maximum intensification, is an important dynamical conditioning process for explosive cyclogenesis. Previous ...

John R. Gyakum; Paul J. Roebber; Timothy A. Bullock

1992-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Self-Stratification of Tropical Cyclone Outflow. Part I: Implications for Storm Structure  

E-Print Network (OSTI)

Extant theoretical work on the steady-state structure and intensity of idealized axisymmetric tropical cyclones relies on the assumption that isentropic surfaces in the storm outflow match those of the unperturbed environment ...

Emanuel, Kerry Andrew

462

Use of a Genesis Potential Index to Diagnose ENSO Effects on Tropical Cyclone Genesis  

Science Conference Proceedings (OSTI)

ENSO (El Niño–Southern Oscillation) has a large influence on tropical cyclone activity. The authors examine how different environmental factors contribute to this influence, using a genesis potential index developed by Emanuel and Nolan. Four ...

Suzana J. Camargo; Kerry A. Emanuel; Adam H. Sobel

2007-10-01T23:59:59.000Z

463

Long-term rainfall risk from tropical cyclones in coastal areas  

E-Print Network (OSTI)

We develop a methodology for the frequency of extreme rainfall intensities caused by tropical cyclones (TCs) in coastal areas. The model does not account for landfall effects. This makes the developed framework best suited ...

Veneziano, Daniele

464

Environmental Dynamical Control of Tropical Cyclone Intensity—An Observational Study  

Science Conference Proceedings (OSTI)

The effects of two environmental dynamical factors, namely, the transitional speed and vertical wind shear, on tropical cyclone (TC) intensification, intensity, and lifetime peak intensity were analyzed based on observations in the western North ...

Zhihua Zeng; Yuqing Wang; Chun-Chieh Wu

2007-01-01T23:59:59.000Z

465

Sudden Tropical Cyclone Track Changes over the Western North Pacific: A Composite Study  

Science Conference Proceedings (OSTI)

Tropical cyclones (TCs) over the western North Pacific (WNP) are usually embedded in the multitime-scale summer monsoon circulation and occasionally experience sudden track changes, which are currently a challenge in TC forecasting. A composite ...

Liguang Wu; Zhongping Ni; Jingjing Duan; Huijun Zong

2013-08-01T23:59:59.000Z

466

A Transition Mechanism for the Spontaneous Axisymmetric Intensification of Tropical Cyclones  

Science Conference Proceedings (OSTI)

A mechanism for the transition of tropical cyclones (TCs) to the spontaneous rapid intensification (RI) phase is proposed based on numerical results of a three-dimensional full-physics model. The intensification phase of the simulated TC is ...

Yoshiaki Miyamoto; Tetsuya Takemi

2013-01-01T23:59:59.000Z

467

Impact of the latitudinal distribution of tropical cyclones on ocean heat transport  

E-Print Network (OSTI)

The heavy winds associated with tropical cyclones generate strong upper ocean mixing. Recent studies suggest that this enhanced mixing significantly contributes to the ocean poleward heat transport, mainly due to a ...

Jansen, Malte Friedrich

468

Does It Make Sense To Modify Tropical Cyclones? A Decision-Analytic Assessment  

E-Print Network (OSTI)

Recent dramatic increases in damages caused by tropical cyclones (TCs) and improved understanding of TC physics have led DHS to fund research on intentional hurricane modification. We present a decision analytic assessment ...

Klima, Kelly

469

Investigating Global Tropical Cyclone Activity with a Hierarchy of AGCMs: The Role of Model Resolution  

Science Conference Proceedings (OSTI)

The ability to run general circulation models (GCMs) at ever-higher horizontal resolutions has meant that tropical cyclone simulations are increasingly credible. A hierarchy of atmosphere-only GCMs, based on the Hadley Centre Global Environmental ...

Jane Strachan; Pier Luigi Vidale; Kevin Hodges; Malcolm Roberts; Marie-Estelle Demory

2013-01-01T23:59:59.000Z

470

Validation of a Tropical Cyclone Steering Response Function with a Barotropic Adjoint Model  

Science Conference Proceedings (OSTI)

The steering of a tropical cyclone (TC) vortex is commonly understood as the advection of the TC vortex by an “environmental wind.” In past studies, the environmental steering wind vector has been defined by the horizontal and vertical averaging ...

Brett T. Hoover; Michael C. Morgan

2010-06-01T23:59:59.000Z

471

Verification of Ensemble-Based Uncertainty Circles around Tropical Cyclone Track Forecasts  

Science Conference Proceedings (OSTI)

Several tropical cyclone forecasting centers issue uncertainty information with regard to their official track forecasts, generally using the climatological distribution of position error. However, such methods are not able to convey information ...

Thierry Dupont; Matthieu Plu; Philippe Caroff; Ghislain Faure

2011-10-01T23:59:59.000Z

472

Tropical Cyclone Wind Retrievals from the Advanced Microwave Sounding Unit: Application to Surface Wind Analysis  

Science Conference Proceedings (OSTI)

Horizontal winds at 850 hPa from tropical cyclones retrieved using the nonlinear balance equation, where the mass field was determined from Advanced Microwave Sounding Unit (AMSU) temperature soundings, are compared with the surface wind fields ...

Kotaro Bessho; Mark DeMaria; John A. Knaff

2006-03-01T23:59:59.000Z

473

Tropical Cyclone Activity Downscaled from NOAA-CIRES Reanalysis, 1908-1958  

E-Print Network (OSTI)

A recently developed technique for deducing tropical cyclone activity from global reanalyses and climate models is applied to a reanalysis of the global atmosphere during the period 1908-1958. This reanalysis assimilates ...

Emanuel, Kerry Andrew

474

Interpretation of Tropical Cyclone Forecast Sensitivity from the Singular Vector Perspective  

Science Conference Proceedings (OSTI)

In this study, the leading singular vectors (SVs), which are the fastest-growing perturbations (in a linear sense) to a given forecast, are used to examine and classify the dynamic relationship between tropical cyclones (TCs) and synoptic-scale ...

Jan-Huey Chen; Melinda S. Peng; Carolyn A. Reynolds; Chun-Chieh Wu

2009-11-01T23:59:59.000Z

475

Size and Strength of Tropical Cyclones as Inferred from QuikSCAT Data  

Science Conference Proceedings (OSTI)

A comprehensive statistical climatology of the size and strength of the tropical cyclones (TCs) occurring over the western North Pacific (WNP; including the South China Sea) and the North Atlantic (NA; including the Gulf of Mexico and the ...

Kelvin T. F. Chan; Johnny C. L. Chan

2012-03-01T23:59:59.000Z

476

Self-Stratification of Tropical Cyclone Outflow. Part II: Implications for Storm Intensification  

E-Print Network (OSTI)

Tropical cyclones intensify and are maintained by surface enthalpy fluxes that result from the thermodynamics disequilibrium that exists between the tropical oceans and atmosphere. While this general result has been known ...

Emanuel, Kerry Andrew

477

Performance of the United Kingdom Meteorological Office Global Model in Predicting the Movement of Tropical Cyclones  

Science Conference Proceedings (OSTI)

A detailed evaluation of the performance of the United Kingdom Meteorological Office Global Model (UKMO) in predicting the movement of 15 tropical cyclones (TCs) that occurred over the western North Pacific during 1987 is presented. The ...

Johnny C. L. Chan; Wai-Kau Kay

1993-09-01T23:59:59.000Z

478

Consistent Tropical Cyclone Wind and Wave Forecasts for the U.S. Navy  

Science Conference Proceedings (OSTI)

A new algorithm to generate wave heights consistent with tropical cyclone official forecasts from the Joint Typhoon Warning Center (JTWC) has been developed. The process involves generating synthetic observations from the forecast track and the ...

Charles R. Sampson; Paul A. Wittmann; Hendrik L. Tolman

2010-08-01T23:59:59.000Z

479

Diagnosis of Upper-Level Processes Influencing an Unusually Intense Extratropical Cyclone over Southeast Australia  

Science Conference Proceedings (OSTI)

On 1 December 1987, an unusual midlatitude cyclone affected much of southeastern Australia. The storm was characterized by unforced rapid deepening to a near record low (locally) mean sea-level pressure, high winds, anomalously cold surface ...

Christopher S. Velden; Graham A. Mills

1990-09-01T23:59:59.000Z

480

A Simple Empirical Model for Predicting the Decay of Tropical Cyclone Winds after Landfall  

Science Conference Proceedings (OSTI)

An empirical model for predicting the maximum wind of landfalling tropical cyclones is developed. The model is based upon the observation that the wind speed decay rate after landfall is proportional to the wind speed. Observations also indicate ...

John Kaplan; Mark DeMaria

1995-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "medium cyclone optimizaton" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

A TRMM-Based Tropical Cyclone Cloud and Precipitation Feature Database  

Science Conference Proceedings (OSTI)

The Tropical Rainfall Measuring Mission (TRMM) satellite has provided invaluable data for tropical cyclone (TC) research since December 1997. The challenge, however, is how to analyze and efficiently utilize all of the information from several ...

Haiyan Jiang; Chuntao Liu; Edward J. Zipser

2011-06-01T23:59:59.000Z

482

On the Orientation of Grid Systems for the Statistical Prediction of Tropical Cyclone Motion  

Science Conference Proceedings (OSTI)

Statistical models for the prediction of tropical cyclone motion traditionally have been formulated in a coordinate system oriented with respect to zonal and meridional directions. An investigation is made here into the forecast error reducing ...

Lloyd J. Shapiro; Charles J. Neumann

1984-01-01T23:59:59.000Z

483

Attribution of Projected Future Changes in Tropical Cyclone Passage Frequency over the Western North Pacific  

Science Conference Proceedings (OSTI)

This paper performs an attribution analysis of future changes in the frequency of tropical cyclone (TC) passages over the western North Pacific basin projected by seven general circulation models. The models project increases in the passage ...

Satoru Yokoi; Yukari N. Takayabu; Hiroyuki Murakami

2013-06-01T23:59:59.000Z

484

The Impact of Anthropogenic Climate Change on North Atlantic Tropical Cyclone Tracks  

Science Conference Proceedings (OSTI)

The authors examine the change in tropical cyclone (TC) tracks that results from projected changes in the large-scale steering flow and genesis location from increasing greenhouse gases. Tracks are first simulated using a Beta and Advection Model (...

Angela J. Colbert; Brian J. Soden; Gabriel A. Vecchi; Ben P. Kirtman

2013-06-01T23:59:59.000Z

485

The Ability of CMIP5 Models to Simulate North Atlantic Extratropical Cyclones  

Science Conference Proceedings (OSTI)

The ability of the climate models participating in phase 5 of the Coupled Model Intercomparison Project (CMIP5) to simulate North Atlantic extratropical cyclones in winter [December–February (DJF)] and summer [June–August (JJA)] is investigated in ...

Giuseppe Zappa; Len C. Shaffrey; Kevin I. Hodges

2013-08-01T23:59:59.000Z

486

An Evaluation of the Impact of Horizontal Resolution on Tropical Cyclone Predictions using COAMPS-TC  

Science Conference Proceedings (OSTI)

A series of experiments have been conducted using the Coupled Ocean/Atmosphere Mesoscale Prediction System – Tropical Cyclone (COAMPS-TC) to assess the impact of horizontal resolution on hurricane intensity prediction for ten Atlantic storms from ...

Hao Jin; Melinda S. Peng; Yi Jin; James D. Doyle

487

An Evaluation of Tropical Cyclone Genesis Forecasts from Global Numerical Models  

Science Conference Proceedings (OSTI)

Tropical cyclone (TC) forecasts rely heavily on output from global numerical models. While considerable research has investigated the skill of various models with respect to track and intensity, few studies have considered how well global models ...

Daniel J. Halperin; Henry E. Fuelberg; Robert E. Hart; Joshua H. Cossuth; Philip Sura; Richard J. Pasch

2013-12-01T23:59:59.000Z

488

Tropical Cyclone Data Impact Studies: Influence of Model Bias and Synthetic Observations  

Science Conference Proceedings (OSTI)

The impacts of assimilating dropwindsonde data and enhanced atmospheric motion vectors (AMVs) on tropical cyclone track forecasts are examined using the Navy global data assimilation and forecasting systems. Enhanced AMVs have the largest impact ...

Carolyn A. Reynolds; Rolf Langland; Patricia M. Pauley; Christopher Velden

2013-12-01T23:59:59.000Z

489

North American tropical cyclone landfall and SST: a statistical model study  

Science Conference Proceedings (OSTI)

A statistical-stochastic model of the complete lifecycle of North Atlantic (NA) tropical cyclones (TCs) is used to examine the relationship between climate and landfall rates along the North-American Atlantic and Gulf coasts. The model draws on ...

Timothy Hall; Emmi Yonekura

490

Satellite Analysis of Tropical Cyclones Using the Advanced Microwave Sounding Unit (AMSU)  

Science Conference Proceedings (OSTI)

The first Advanced Microwave Sounding Unit (AMSU) was launched aboard the NOAA—15 satellite on 13 May 1998. The AMSU is well suited for the observation of tropical cyclones because its measurements are not significantly affected by the ice clouds ...

Stanley Q. Kidder; Mitchell D. Goldberg; Raymond M. Zehr; Mark DeMaria; James F. W. Purdom; Christopher S. Velden; Norman C. Grody; Sheldon J. Kusselson

2000-06-01T23:59:59.000Z

491

A Preliminary Computer Pattern Analysis of Satellite Images of Mature Extratropical Cyclones  

Science Conference Proceedings (OSTI)

This study has applied computerized pattern analysis techniques to the location and classification of feature of several mature extratropical cyclones that were depicted in GOES satellite images. These features include the location of the center ...

Craig R. Burfeind; James A. Weinman; Bruce R. Barkstrom

1987-02-01T23:59:59.000Z

492

The Denver Cyclone. Part I: Generation in Low Froude Number Flow  

Science Conference Proceedings (OSTI)

A numerical model is used to study the “Denver Cyclone,” a mesoscale vortex that develops in eastern Colorado under southerly to southeasterly flow. Diurnal effects (e.g., surface heating/cooling) have been excluded from these simulations, but ...

N. Andrew Crook; Terry L. Clark; Mitchell W. Moncrieff

1990-12-01T23:59:59.000Z

493

Intercomparison of Targeted Observation Guidance for Tropical Cyclones in the Northwestern Pacific  

Science Conference Proceedings (OSTI)

This study compares six different guidance products for targeted observations over the northwest Pacific Ocean for 84 cases of 2-day forecasts in 2006 and highlights the unique dynamical features affecting the tropical cyclone (TC) tracks in this ...

Chun-Chieh Wu; Jan-Huey Chen; Sharanya J. Majumdar; Melinda S. Peng; Carolyn A. Reynolds; Sim D. Aberson; Roberto Buizza; Munehiko Yamaguchi; Shin-Gan Chen; Tetsuo Nakazawa; Kun-Hsuan Chou

2009-08-01T23:59:59.000Z

494

Annual Volume and Area Variations in Tropical Cyclone Rainfall over the Eastern United States  

Science Conference Proceedings (OSTI)

This paper examines tropical cyclone (TC) rainfall in the eastern United States from the perspective of documenting accumulated annual water volumes and areas of the precipitation. Volume is a value that merges both rainfall depth and rainfall ...

Ricardo C. Nogueira; Barry D. Keim

2010-08-01T23:59:59.000Z

495

Vertical Structure of Tropical Cyclones with Concentric Eyewalls as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Ten years of data from the Tropical Rainfall Measurement Mission satellite’s Precipitation Radar are analyzed to determine the typical vertical structure of the concentric eyewalls of tropical cyclones undergoing eyewall replacement. The vertical ...

Deanna A. Hence; Robert A. Houze Jr.

2012-03-01T23:59:59.000Z

496

Observed versus GCM-Generated Local Tropical Cyclone Frequency: Comparisons Using a Spatial Lattice  

Science Conference Proceedings (OSTI)

Of broad scientific and public interest is the reliability of global climate models (GCMs) to simulate future regional and local tropical cyclone (TC) occurrences. Atmospheric GCMs are now able to generate vortices resembling actual TCs, but ...

Sarah Strazzo; James B. Elsner; Timothy LaRow; Daniel J. Halperin; Ming Zhao

2013-11-01T23:59:59.000Z

497

Recent Changes in Explosively Developing Extratropical Cyclones over the Winter Northwestern Pacific  

Science Conference Proceedings (OSTI)

This study investigated recent changes in the characteristics of explosively developing extratropical cyclones over the northwestern Pacific region in winter from 1979/80 to 2010/11 by using reanalysis data from the Japanese 25-yr Reanalysis/Japan ...

Koki Iwao; Masaru Inatsu; Masahide Kimoto

2012-10-01T23:59:59.000Z

498

Objective Estimation of Tropical Cyclone Wind Structure from Infrared Satellite Data  

Science Conference Proceedings (OSTI)

Geostationary infrared (IR) satellite data are used to provide estimates of the symmetric and total low-level wind fields in tropical cyclones, constructed from estimations of an azimuthally averaged radius of maximum wind (RMAX), a symmetric ...

Kimberly J. Mueller; Mark DeMaria; John Knaff; James P. Kossin; Thomas H. Vonder Haar

2006-12-01T23:59:59.000Z

499

Evaluation of the National Hurricane Center’s Tropical Cyclone Wind Speed Probability Forecast Product  

Science Conference Proceedings (OSTI)

A tropical cyclone (TC) wind speed probability forecast product developed at the Cooperative Institute for Research in the Atmosphere (CIRA) and adopted by the National Hurricane Center (NHC) is evaluated for U.S. land-threatening and landfalling ...

Michael E. Splitt; Jaclyn A. Shafer; Steven M. Lazarus; William P. Roeder

2010-04-01T23:59:59.000Z

500

Influences of ENSO on Western North Pacific Tropical Cyclone Kinetic Energy and Its Meridional Transport  

Science Conference Proceedings (OSTI)

This study investigates the influences of ENSO on tropical cyclone (TC) kinetic energy and its meridional transport in the western North Pacific (WNP) using the TC wind field obtained after a method for removing TC vortices from reanalysis data is ...

Yao Ha; Zhong Zhong; Yijia Hu; Xiuqun Yang

2013-01-01T23:59:59.000Z