Relationship between Aerosols, Hail Microphysics, and Z DR Columns

doi:10.1175/jas-d-17-0127.1

Title: Relationship between Aerosols, Hail Microphysics, and Z _DR Columns

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Abstract

Mechanisms of formation of differential reflectivity columns are investigated in simulations of a midlatitude summertime hailstorm with hailstones up to several centimeters in diameter. Simulations are performed using a new version of the Hebrew University Cloud Model (HUCM) with spectral bin microphysics. A polarimetric radar forward operator is used to calculate radar reflectivity and differential reflectivity ZDR. It is shown that ZDR columns are associated with raindrops and with hail particles growing in a wet growth regime within convective updrafts. The height and volume of ZDR columns increases with an increase in aerosol concentration. Small hail forming under clean conditions grows in updrafts largely in a dry growth regime corresponding to low ZDR. Characteristics of ZDR columns are highly correlated with vertical velocity, hail size, and aerosol concentration.

Authors:

Ilotoviz, E. ^[1]; Khain, A. ^[1]; Ryzhkov, Alexander V. ^[2]; Snyder, Jeffrey C. ^[2]

Hebrew Univ. of Jerusalem (Israel). Dept. of Atmospheric Sciences
National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States); Univ. of Oklahoma, Norman, OK (United States). Cooperative Inst. for Mesoscale Meteorological Studies

Publication Date:: 2018-05-17

Research Org.:: Univ. of Oklahoma, Norman, OK (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1541821

Grant/Contract Number:: SC0014295

Resource Type:: Accepted Manuscript

Journal Name:: Journal of the Atmospheric Sciences

Additional Journal Information:: Journal Volume: 75; Journal Issue: 6; Journal ID: ISSN 0022-4928

Publisher:: American Meteorological Society

Country of Publication:: United States

Language:: English

Subject:: Meteorology & Atmospheric Sciences

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                    Ilotoviz, E., Khain, A., Ryzhkov, Alexander V., and Snyder, Jeffrey C. Relationship between Aerosols, Hail Microphysics, and Z DR Columns.  United States: N. p., 2018. 
        Web.  doi:10.1175/jas-d-17-0127.1.

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                    Ilotoviz, E., Khain, A., Ryzhkov, Alexander V., & Snyder, Jeffrey C. Relationship between Aerosols, Hail Microphysics, and Z DR Columns.  United States.  doi:10.1175/jas-d-17-0127.1.

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                    Ilotoviz, E., Khain, A., Ryzhkov, Alexander V., and Snyder, Jeffrey C. Thu .  
        "Relationship between Aerosols, Hail Microphysics, and Z DR Columns".  United States.  doi:10.1175/jas-d-17-0127.1.  https://www.osti.gov/servlets/purl/1541821.

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@article{osti_1541821,

  title        = {Relationship between Aerosols, Hail Microphysics, and Z DR Columns},

  author       = {Ilotoviz, E. and Khain, A. and Ryzhkov, Alexander V. and Snyder, Jeffrey C.},

  abstractNote = {Mechanisms of formation of differential reflectivity columns are investigated in simulations of a midlatitude summertime hailstorm with hailstones up to several centimeters in diameter. Simulations are performed using a new version of the Hebrew University Cloud Model (HUCM) with spectral bin microphysics. A polarimetric radar forward operator is used to calculate radar reflectivity and differential reflectivity ZDR. It is shown that ZDR columns are associated with raindrops and with hail particles growing in a wet growth regime within convective updrafts. The height and volume of ZDR columns increases with an increase in aerosol concentration. Small hail forming under clean conditions grows in updrafts largely in a dry growth regime corresponding to low ZDR. Characteristics of ZDR columns are highly correlated with vertical velocity, hail size, and aerosol concentration.},

  doi          = {10.1175/jas-d-17-0127.1},

  journal      = {Journal of the Atmospheric Sciences},

  number       = 6,

  volume       = 75,

  place        = {United States},

  year         = {2018},

  month        = {5}

}

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DOI: 10.1175/jas-d-17-0127.1

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Title: Relationship between Aerosols, Hail Microphysics, and Z DR Columns

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Title: Relationship between Aerosols, Hail Microphysics, and Z _DR Columns