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Title: On the predominance of unstable atmospheric conditions in the marine boundary layer offshore of the U.S. northeastern coast: UNSTABLE CONDITIONS OFFSHORE EASTERN U.S.

Authors:
 [1];  [2];  [1];  [1];  [2]
  1. College of Earth, Ocean, and Environment, University of Delaware, Newark Delaware USA
  2. School of Marine and Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook New York USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1287748
Grant/Contract Number:
EE0005377
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 121; Journal Issue: 15; Related Information: CHORUS Timestamp: 2016-08-23 17:17:14; Journal ID: ISSN 2169-897X
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
United States
Language:
English

Citation Formats

Archer, Cristina L., Colle, Brian A., Veron, Dana L., Veron, Fabrice, and Sienkiewicz, Matthew J.. On the predominance of unstable atmospheric conditions in the marine boundary layer offshore of the U.S. northeastern coast: UNSTABLE CONDITIONS OFFSHORE EASTERN U.S.. United States: N. p., 2016. Web. doi:10.1002/2016JD024896.
Archer, Cristina L., Colle, Brian A., Veron, Dana L., Veron, Fabrice, & Sienkiewicz, Matthew J.. On the predominance of unstable atmospheric conditions in the marine boundary layer offshore of the U.S. northeastern coast: UNSTABLE CONDITIONS OFFSHORE EASTERN U.S.. United States. doi:10.1002/2016JD024896.
Archer, Cristina L., Colle, Brian A., Veron, Dana L., Veron, Fabrice, and Sienkiewicz, Matthew J.. 2016. "On the predominance of unstable atmospheric conditions in the marine boundary layer offshore of the U.S. northeastern coast: UNSTABLE CONDITIONS OFFSHORE EASTERN U.S.". United States. doi:10.1002/2016JD024896.
@article{osti_1287748,
title = {On the predominance of unstable atmospheric conditions in the marine boundary layer offshore of the U.S. northeastern coast: UNSTABLE CONDITIONS OFFSHORE EASTERN U.S.},
author = {Archer, Cristina L. and Colle, Brian A. and Veron, Dana L. and Veron, Fabrice and Sienkiewicz, Matthew J.},
abstractNote = {},
doi = {10.1002/2016JD024896},
journal = {Journal of Geophysical Research: Atmospheres},
number = 15,
volume = 121,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1002/2016JD024896

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  • Data collected on board an instrumented aircraft during the Marine Atmospheric Boundary Layer Experiments, West Coast (MABLES WC) field study are examined. The data were collected at several levels in the marine and inversion layers approximately 200 km west of the central California coast during August 1978. Composite soundings and cross sections of wind and temperature variables are presented to provide an overview of the mesoscale structure of the offshore marine and inversion layers at the time of MABLES WC. Under typical summertime synoptic conditions, which prevailed early in the study period (three flights examined), a strong inversion is found.more » Base heights and temperature increases across the inversion base are comparable to values observed in the San Francisco Bay area. The topography of the inversion base shows a slope downward toward the east during all three of these flights and also suggests the presence of convective activity, gravity-wave activity, or both, during two of the three flights. The inversion weakened later in the study period when atypical synoptic conditions prevailed. During typical conditions, wind-speed minima were found near the base of the inversion, and jets with speeds as high as 17-18 m s[sup [minus]1] were found within the inversion layer. These observations of the vertical wind profile agree with those made in the San Francisco Bay area. Further, in two of the three cases, a well-organized horizontal structure of the jet was apparent. Data gathered during a flight later in the study period ( atypical' synoptic conditions) are also presented and show a particularly good example of the jet in the offshore region. 34 refs., 10 figs., 1 tab.« less
  • The vertical turbulence structure in the marine atmosphere along a shoreline has been investigated using data from tower and aircraft measurements performed along the Baltic coast in the southeast of Sweden. Two properties make the Baltic Sea particularly interesting. It is surrounded by land in all directions within moderate advection distances, and it features a significant annual lag in sea surface temperature as compared with inland surface temperature. The present data were collected mostly during spring or early summer, when the water is cool, i.e., with a stably or neutrally stratified marine boundary layer usually capped by an inversion. Substantialmore » daytime heating over the land area results in a considerable horizontal thermal contrast. Measurements were made on a small island, on a tower with a good sea fetch, and with an airborne instrument package. The profile data from the aircraft is from 25 slant soundings performed in connection to low level boundary layer flights. The results from the profiles are extracted through filtering techniques on individual time (space) series (individual profiles), applying different normalization and finally averaging over all or over groups of profiles. The land-based data are from a low tower situated on the shoreline of a small island with a wide sector of unobstructed sea fetch. Several factors are found that add to the apparent complexity of the coastal marine environment: the state of the sea appears to have a major impact on the turbulence structure of the surface layer, jet-shaped wind speed profiles were very common at the top of the boundary layer (in about 50% of the cases) and distinct layers with increased turbulence were frequently found well above the boundary layer (in about 80% of the cases). The present paper will concentrate on a description of the experiment, the analysis methods, and a general description of the boundary layer turbulence structure over the Baltic Sea. 40 refs., 16 figs., 2 tabs.« less
  • A {open_quotes}thermostat{close_quotes} mechanism for cooling the Equatorial Pacific is being tested with data collected during the Central Equatorial Pacific Experiment. The Los Alamos National Laboratory participated by fielding two shipboard lidars that collected nearly continuous data over the Pacific from 10 to 21 March 1993 as the ship sailed from Guadalcanal to Christmas Island. A Raman lidar measured water vapor mixing ratio in the lower troposphere, especially in the marine atmosphere boundary layer (ABL), and an aerosol backscatter lidar measured height and thickness of clouds to an altitude of 20 km. The data collected from these two lidars were usedmore » to determine ocean-atmosphere phenomonology, which in turn, affects the climatology of the Central Pacific. Agreement between coincident radiosonde and the Raman water vapor lidar measurements was typically within {plus_minus} 0.25 g kg{sup {minus}1} of water. Divergence between the two instruments occurred at transitions between distinct layers in the lower marine atmosphere. Reasons for this divergence will be discussed. Above the ABL the lidar and radiosonde are in excellent agreement. A wealth of detail is apparent in the lidar-derived profiles. For example, there are large variations in water vapor mixing ratio-the expression of the inherent low-frequency, intermittent, atmospheric turbulence that produces spatially discrete features such as convective plumes. These features define the structure and extent of the ABL. Using the ABL structural characteristics, an analysis of the relationship between entrainment zone (EZ) height and observed sea surface temperature (SST) revealed counterintuitive behavior - that the height of the EZ decreases as SST increases in the range between 27{degrees} and 30{degrees}C. 56 refs., 14 figs.« less