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Title: Identification and Characterization of Persistent Cold Pool Events from Temperature and Wind Profilers in the Columbia River Basin

Abstract

Cold pool events occur when deep layers of stable, cold air remain trapped in a valley or basin for multiple days, without mixing out from daytime heating. With large impacts on air quality, freezing events, and especially on wind energy production, they are often poorly forecast by modern mesoscale numerical weather prediction (NWP) models. Understanding the characteristics of cold pools is, therefore, important to provide more accurate forecasts. This study analyzes cold pool characteristics with data collected during the Second Wind Forecast Improvement Project (WFIP2), which took place in the Columbia River basin and Gorge of Oregon and Washington from fall 2015 until spring 2017. A subset of the instrumentation included three microwave radiometer profilers, six radar wind profilers with radio acoustic sounding systems, and seven sodars, which together provided seven sites with collocated vertical profiles of temperature, humidity, wind speed, and wind direction. Using these collocated observations, we developed a set of criteria to determine if a cold pool was present based on stability, wind speed, direction, and temporal continuity, and then developed an automated algorithm based on these criteria to identify all cold pool events over the 18 months of the field project. Characteristics of these events aremore » described, including statistics of the wind speed distributions and profiles, stability conditions, cold pool depths, and descent rates of the cold pool top. The goal of this study is a better understanding of these characteristics and their processes to ultimately lead to improved physical parameterizations in NWP models, and consequently improve forecasts of cold pool events in the study region as well at other locations that experiences similar events.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [8];  [9];  [10]
  1. S&P Global Market Intelligence, Boulder, Colorado, Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, Colorado, CIRES, University of Colorado Boulder, Boulder, Colorado
  2. Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, Colorado
  3. Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, Colorado, CIRES, University of Colorado Boulder, Boulder, Colorado
  4. Vaisala, Seattle, Washington
  5. Sharply Focused, Portland, Oregon
  6. Chemical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, Colorado
  7. Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, Colorado
  8. University of Notre Dame, South Bend, Indiana
  9. University of Notre Dame, South Bend, Indiana, Department of Physics and Astronomy, University of Bologna, Bologna, Italy
  10. Argonne National Laboratory, U.S. Department of Energy, Argonne, Illinois
Publication Date:
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind Energy Technologies Office (EE-4WE)
OSTI Identifier:
1575825
Grant/Contract Number:  
EE0006898; AC02-05CH11231; DOE-WFIP2-CU-001; DOE-WFIFP2-SUB-001; DOE-WFIP2-SUB-001; NA
Resource Type:
Published Article
Journal Name:
Journal of Applied Meteorology and Climatology
Additional Journal Information:
Journal Name: Journal of Applied Meteorology and Climatology Journal Volume: 58 Journal Issue: 12; Journal ID: ISSN 1558-8424
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English

Citation Formats

McCaffrey, Katherine, Wilczak, James M., Bianco, Laura, Grimit, Eric, Sharp, Justin, Banta, Robert, Friedrich, Katja, Fernando, H. J. S., Krishnamurthy, Raghavendra, Leo, Laura S., and Muradyan, Paytsar. Identification and Characterization of Persistent Cold Pool Events from Temperature and Wind Profilers in the Columbia River Basin. United States: N. p., 2019. Web. doi:10.1175/JAMC-D-19-0046.1.
McCaffrey, Katherine, Wilczak, James M., Bianco, Laura, Grimit, Eric, Sharp, Justin, Banta, Robert, Friedrich, Katja, Fernando, H. J. S., Krishnamurthy, Raghavendra, Leo, Laura S., & Muradyan, Paytsar. Identification and Characterization of Persistent Cold Pool Events from Temperature and Wind Profilers in the Columbia River Basin. United States. doi:10.1175/JAMC-D-19-0046.1.
McCaffrey, Katherine, Wilczak, James M., Bianco, Laura, Grimit, Eric, Sharp, Justin, Banta, Robert, Friedrich, Katja, Fernando, H. J. S., Krishnamurthy, Raghavendra, Leo, Laura S., and Muradyan, Paytsar. Sun . "Identification and Characterization of Persistent Cold Pool Events from Temperature and Wind Profilers in the Columbia River Basin". United States. doi:10.1175/JAMC-D-19-0046.1.
@article{osti_1575825,
title = {Identification and Characterization of Persistent Cold Pool Events from Temperature and Wind Profilers in the Columbia River Basin},
author = {McCaffrey, Katherine and Wilczak, James M. and Bianco, Laura and Grimit, Eric and Sharp, Justin and Banta, Robert and Friedrich, Katja and Fernando, H. J. S. and Krishnamurthy, Raghavendra and Leo, Laura S. and Muradyan, Paytsar},
abstractNote = {Cold pool events occur when deep layers of stable, cold air remain trapped in a valley or basin for multiple days, without mixing out from daytime heating. With large impacts on air quality, freezing events, and especially on wind energy production, they are often poorly forecast by modern mesoscale numerical weather prediction (NWP) models. Understanding the characteristics of cold pools is, therefore, important to provide more accurate forecasts. This study analyzes cold pool characteristics with data collected during the Second Wind Forecast Improvement Project (WFIP2), which took place in the Columbia River basin and Gorge of Oregon and Washington from fall 2015 until spring 2017. A subset of the instrumentation included three microwave radiometer profilers, six radar wind profilers with radio acoustic sounding systems, and seven sodars, which together provided seven sites with collocated vertical profiles of temperature, humidity, wind speed, and wind direction. Using these collocated observations, we developed a set of criteria to determine if a cold pool was present based on stability, wind speed, direction, and temporal continuity, and then developed an automated algorithm based on these criteria to identify all cold pool events over the 18 months of the field project. Characteristics of these events are described, including statistics of the wind speed distributions and profiles, stability conditions, cold pool depths, and descent rates of the cold pool top. The goal of this study is a better understanding of these characteristics and their processes to ultimately lead to improved physical parameterizations in NWP models, and consequently improve forecasts of cold pool events in the study region as well at other locations that experiences similar events.},
doi = {10.1175/JAMC-D-19-0046.1},
journal = {Journal of Applied Meteorology and Climatology},
number = 12,
volume = 58,
place = {United States},
year = {2019},
month = {12}
}

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