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Title: Polarimetric Radar Characteristics of Simulated and Observed Intense Convective Cores for a Midlatitude Continental and Tropical Maritime Environment

Abstract

This study contrasts midlatitude continental and tropical maritime deep convective cores using polarimetric radar observables and retrievals from selected deep convection episodes during the MC3E and TWPICE field campaigns. The continental convective cores produce stronger radar reflectivities throughout the profiles, while maritime convective cores produce more positive differential reflectivity Z dr and larger specific differential phase K dp above the melting level. Hydrometeor identification retrievals revealed the presence of large fractions of rimed ice particles (snow aggregates) in the continental (maritime) convective cores, consistent with the Z dr and K dp observations. The regional cloud-resolving model simulations with bulk and size-resolved bin microphysics are conducted for the selected cases, and the simulation outputs are converted into polarimetric radar signals and retrievals identical to the observational composites. Both the bulk and the bin microphysics reproduce realistic land and ocean (L-O) contrasts in reflectivity, polarimetric variables of rain drops, and hydrometeor profiles, but there are still large uncertainties in describing Z dr and K dp of ice crystals associated with the ice particle shapes/orientation assumptions. Sensitivity experiments are conducted by swapping background aerosols between the continental and maritime environments, revealing that background aerosols play a role in shaping the distinct L-O contrastsmore » in radar reflectivity associated with raindrop sizes, in addition to the dominant role of background thermodynamics.« less

Authors:
 [1];  [2];  [1];  [2];  [3];  [4]
  1. NASA Goddard Space Flight Center, Greenbelt, Maryland, Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, Maryland
  2. Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado
  3. NASA Goddard Space Flight Center, Greenbelt, Maryland
  4. NASA Goddard Space Flight Center, Greenbelt, Maryland, Science Systems and Applications, Inc., Lanham, Maryland
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1606072
Grant/Contract Number:  
SC0014371; 80NSSC19K0724
Resource Type:
Published Article
Journal Name:
Journal of Hydrometeorology
Additional Journal Information:
Journal Name: Journal of Hydrometeorology Journal Volume: 21 Journal Issue: 3; Journal ID: ISSN 1525-755X
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English

Citation Formats

Matsui, Toshi, Dolan, Brenda, Iguchi, Takamichi, Rutledge, Steven A., Tao, Wei-Kuo, and Lang, Stephen. Polarimetric Radar Characteristics of Simulated and Observed Intense Convective Cores for a Midlatitude Continental and Tropical Maritime Environment. United States: N. p., 2020. Web. doi:10.1175/JHM-D-19-0185.1.
Matsui, Toshi, Dolan, Brenda, Iguchi, Takamichi, Rutledge, Steven A., Tao, Wei-Kuo, & Lang, Stephen. Polarimetric Radar Characteristics of Simulated and Observed Intense Convective Cores for a Midlatitude Continental and Tropical Maritime Environment. United States. doi:10.1175/JHM-D-19-0185.1.
Matsui, Toshi, Dolan, Brenda, Iguchi, Takamichi, Rutledge, Steven A., Tao, Wei-Kuo, and Lang, Stephen. Sun . "Polarimetric Radar Characteristics of Simulated and Observed Intense Convective Cores for a Midlatitude Continental and Tropical Maritime Environment". United States. doi:10.1175/JHM-D-19-0185.1.
@article{osti_1606072,
title = {Polarimetric Radar Characteristics of Simulated and Observed Intense Convective Cores for a Midlatitude Continental and Tropical Maritime Environment},
author = {Matsui, Toshi and Dolan, Brenda and Iguchi, Takamichi and Rutledge, Steven A. and Tao, Wei-Kuo and Lang, Stephen},
abstractNote = {This study contrasts midlatitude continental and tropical maritime deep convective cores using polarimetric radar observables and retrievals from selected deep convection episodes during the MC3E and TWPICE field campaigns. The continental convective cores produce stronger radar reflectivities throughout the profiles, while maritime convective cores produce more positive differential reflectivity Z dr and larger specific differential phase K dp above the melting level. Hydrometeor identification retrievals revealed the presence of large fractions of rimed ice particles (snow aggregates) in the continental (maritime) convective cores, consistent with the Z dr and K dp observations. The regional cloud-resolving model simulations with bulk and size-resolved bin microphysics are conducted for the selected cases, and the simulation outputs are converted into polarimetric radar signals and retrievals identical to the observational composites. Both the bulk and the bin microphysics reproduce realistic land and ocean (L-O) contrasts in reflectivity, polarimetric variables of rain drops, and hydrometeor profiles, but there are still large uncertainties in describing Z dr and K dp of ice crystals associated with the ice particle shapes/orientation assumptions. Sensitivity experiments are conducted by swapping background aerosols between the continental and maritime environments, revealing that background aerosols play a role in shaping the distinct L-O contrasts in radar reflectivity associated with raindrop sizes, in addition to the dominant role of background thermodynamics.},
doi = {10.1175/JHM-D-19-0185.1},
journal = {Journal of Hydrometeorology},
number = 3,
volume = 21,
place = {United States},
year = {2020},
month = {3}
}

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