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Title: Use of polarimetric radar measurements to constrain simulated convective cell evolution: a pilot study with Lagrangian tracking

Abstract

To probe the potential value of a radar-driven field campaign to constrain simulation of isolated convection subject to a strong aerosol perturbation, convective cells observed by the operational KHGX weather radar in the vicinity of Houston, Texas, are examined individually and statistically. Cells observed in a single case study of onshore flow conditions during July 2013 are first examined and compared with cells in a regional model simulation. Observed and simulated cells are objectively identified and tracked from observed or calculated positive specific differential phase ( K DP) above the melting level, which isrelated to the presence of super cooled liquid water. Several observed and simulated cells are subjectively selected for further examination. Below the melting level, we compare sequential cross sections of retrieved and simulated raindrop size distribution parameters. Above the melting level, we examine time series of K DP and radar differential reflectivity ( Z DR) statistics from observations and calculated from simulated supercooled rain properties, alongside simulated vertical wind and supercooled rain mixing ratio statistics. Results indicate that the operational weather radar measurements offer multiple constraints on the properties of simulated convective cells, with substantial value added from derived K DP and retrieved rain properties. The value ofmore » collocated three-dimensional lightning mapping array measurements, which are relatively rare in the continental US, supports the choice of Houston as a suitable location for future field studies to improve the simulation and understanding of convective updraft physics. However, rapid evolution of cells between routine volume scans motivates consideration of adaptive scan strategies or radar imaging technologies to amend operational weather radar capabilities. A 3-year climatology of isolated cell tracks, prepared using a more efficient algorithm, yields additional relevant information.Isolated cells are found within the KHGX domain on roughly 40 % of days year-round, with greatest concentration in the northwest quadrant, but roughly 5-fold more cells occur during June through September. During this enhanced occurrence period, the cells initiate following a strong diurnal cycle that peaks in the early afternoon, typically follow a south-to-north flow, and dissipate within 1 h, consistent with the case study examples.Statistics indicate that ~ 150 isolated cells initiate and dissipate within 70 km of the KHGX radar during the enhanced occurrence period annually, and roughly 10 times as many within 200 km, suitable for multi-instrument Lagrangian observation strategies. In addition to ancillary meteorological and aerosol measurements, robust vertical wind speed retrievals would add substantial value to a radar-driven field campaign.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [3];  [5];  [6];  [7];  [4];  [8];  [9];  [7];  [10]
  1. NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
  2. NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States); Columbia Univ., New York, NY (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Morgan State University, Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
  7. Texas A & M Univ., College Station, TX (United States)
  8. Hebrew Univ. of Jerusalem (Israel)
  9. National Weather Center, Norman, OK (United States)
  10. National Weather Center, Norman, OK (United States); NOAA/OAR National Severe Storms Laboratory, Norman, OK (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1529067
Report Number(s):
BNL-211797-2019-JAAM
Journal ID: ISSN 1867-8548
Grant/Contract Number:  
SC0012704; SC0006988; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Volume: 12; Journal Issue: 6; Journal ID: ISSN 1867-8548
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Fridlind, Ann M., van Lier-Walqui, Marcus, Collis, Scott, Giangrande, Scott E., Jackson, Robert C., Li, Xiaowen, Matsui, Toshihisa, Orville, Richard, Picel, Mark H., Rosenfeld, Daniel, Ryzhkov, Alexander, Weitz, Richard, and Zhang, Pengfei. Use of polarimetric radar measurements to constrain simulated convective cell evolution: a pilot study with Lagrangian tracking. United States: N. p., 2019. Web. doi:10.5194/amt-12-2979-2019.
Fridlind, Ann M., van Lier-Walqui, Marcus, Collis, Scott, Giangrande, Scott E., Jackson, Robert C., Li, Xiaowen, Matsui, Toshihisa, Orville, Richard, Picel, Mark H., Rosenfeld, Daniel, Ryzhkov, Alexander, Weitz, Richard, & Zhang, Pengfei. Use of polarimetric radar measurements to constrain simulated convective cell evolution: a pilot study with Lagrangian tracking. United States. doi:10.5194/amt-12-2979-2019.
Fridlind, Ann M., van Lier-Walqui, Marcus, Collis, Scott, Giangrande, Scott E., Jackson, Robert C., Li, Xiaowen, Matsui, Toshihisa, Orville, Richard, Picel, Mark H., Rosenfeld, Daniel, Ryzhkov, Alexander, Weitz, Richard, and Zhang, Pengfei. Mon . "Use of polarimetric radar measurements to constrain simulated convective cell evolution: a pilot study with Lagrangian tracking". United States. doi:10.5194/amt-12-2979-2019. https://www.osti.gov/servlets/purl/1529067.
@article{osti_1529067,
title = {Use of polarimetric radar measurements to constrain simulated convective cell evolution: a pilot study with Lagrangian tracking},
author = {Fridlind, Ann M. and van Lier-Walqui, Marcus and Collis, Scott and Giangrande, Scott E. and Jackson, Robert C. and Li, Xiaowen and Matsui, Toshihisa and Orville, Richard and Picel, Mark H. and Rosenfeld, Daniel and Ryzhkov, Alexander and Weitz, Richard and Zhang, Pengfei},
abstractNote = {To probe the potential value of a radar-driven field campaign to constrain simulation of isolated convection subject to a strong aerosol perturbation, convective cells observed by the operational KHGX weather radar in the vicinity of Houston, Texas, are examined individually and statistically. Cells observed in a single case study of onshore flow conditions during July 2013 are first examined and compared with cells in a regional model simulation. Observed and simulated cells are objectively identified and tracked from observed or calculated positive specific differential phase (KDP) above the melting level, which isrelated to the presence of super cooled liquid water. Several observed and simulated cells are subjectively selected for further examination. Below the melting level, we compare sequential cross sections of retrieved and simulated raindrop size distribution parameters. Above the melting level, we examine time series of KDP and radar differential reflectivity (ZDR) statistics from observations and calculated from simulated supercooled rain properties, alongside simulated vertical wind and supercooled rain mixing ratio statistics. Results indicate that the operational weather radar measurements offer multiple constraints on the properties of simulated convective cells, with substantial value added from derived KDP and retrieved rain properties. The value of collocated three-dimensional lightning mapping array measurements, which are relatively rare in the continental US, supports the choice of Houston as a suitable location for future field studies to improve the simulation and understanding of convective updraft physics. However, rapid evolution of cells between routine volume scans motivates consideration of adaptive scan strategies or radar imaging technologies to amend operational weather radar capabilities. A 3-year climatology of isolated cell tracks, prepared using a more efficient algorithm, yields additional relevant information.Isolated cells are found within the KHGX domain on roughly 40 % of days year-round, with greatest concentration in the northwest quadrant, but roughly 5-fold more cells occur during June through September. During this enhanced occurrence period, the cells initiate following a strong diurnal cycle that peaks in the early afternoon, typically follow a south-to-north flow, and dissipate within 1 h, consistent with the case study examples.Statistics indicate that ~ 150 isolated cells initiate and dissipate within 70 km of the KHGX radar during the enhanced occurrence period annually, and roughly 10 times as many within 200 km, suitable for multi-instrument Lagrangian observation strategies. In addition to ancillary meteorological and aerosol measurements, robust vertical wind speed retrievals would add substantial value to a radar-driven field campaign.},
doi = {10.5194/amt-12-2979-2019},
journal = {Atmospheric Measurement Techniques (Online)},
issn = {1867-8548},
number = 6,
volume = 12,
place = {United States},
year = {2019},
month = {6}
}

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