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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Jan 2019

Research article | 15 Jan 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

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

Ann M. Fridlind1, Marcus van Lier-Walqui1,2, Scott Collis3, Scott E. Giangrande4, Robert C. Jackson3, Xiaowen Li5,6, Toshihisa Matsui6,7, Richard Orville8, Mark H. Picel4, Daniel Rosenfeld9, Alexander Ryzhkov10, Richard Weitz8, and Pengfei Zhang10,11 Ann M. Fridlind et al.
  • 1NASA Goddard Institute for Space Studies, New York, NY, USA
  • 2Columbia University, New York, NY, USA
  • 3DOE Argonne National Laboratory, Argonne, IL, USA
  • 4DOE Brookhaven National Laboratory, Upton, NY, USA
  • 5GESTAR/Morgan State University, Baltimore, MD, USA
  • 6NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 7ESSIC/University of Maryland, College Park, MD, USA
  • 8Texas A&M University, College Station, TX, USA
  • 9The Hebrew University of Jerusalem, Jerusalem, Israel
  • 10Cooperative Institute for Mesoscale meteorological Studies, University of Oklahoma, Norman, OK, USA
  • 11NOAA/OAR National Severe Storms Laboratory, Norman, OK, USA

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 (KDP) above the melting level, which is related to the presence of supercooled 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 U.S., 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 three-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 fivefold 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 an hour, 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 ten 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.

Ann M. Fridlind et al.
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Status: open (until 15 Mar 2019)
Status: open (until 15 Mar 2019)
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Ann M. Fridlind et al.
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Publications Copernicus
Short summary
Weather radars are offering improved capabilities to investigate storm physics, which remain poorly understood. We investigate enhanced use of such data near Houston, Texas, where pollution sources often provide a convenient contrast between polluted and clean air. We conclude that Houston is a favorable location to conduct a future field campaign during June through September months because isolated storms are common and tend to last an hour, allowing frequent observations of a full life cycle.
Weather radars are offering improved capabilities to investigate storm physics, which remain...