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    Sensitivity of 89–190-GHz Microwave Observations to Ice Particle Scattering

    Source: Journal of Applied Meteorology and Climatology:;2020:;volume( 59 ):;issue: 007::page 1195
    Author:
    Chen, Ruiyao;Bennartz, Ralf
    DOI: 10.1175/JAMC-D-19-0293.1
    Publisher: American Meteorological Society
    Abstract: The sensitivity of microwave brightness temperatures (TBs) to hydrometeors at frequencies between 89 and 190 GHz is investigated by comparing Fengyun-3C (FY-3C) Microwave Humidity Sounder-2 (MWHS-2) measurements with radar reflectivity profiles and retrieved products from the Global Precipitation Measurement mission’s Dual-Frequency Precipitation Radar (DPR). Scattering-induced TB depressions (ΔTBs), calculated by subtracting simulated cloud-free TBs from bias-corrected observed TBs for each channel, are compared with DPR-retrieved hydrometeor water path (HWP) and vertically integrated radar reflectivity ZINT. We also account for the number of hydrometeors actually visible in each MWHS-2 channel by weighting HWP with the channel’s cloud-free gas transmission profile and the observation slant path. We denote these transmission-weighted, slant-path-integrated quantities with a superscript asterisk (e.g., HWP*). The so-derived linear sensitivity of ΔTB with respect to HWP* increases with frequency roughly to the power of 1.78. A retrieved HWP* of 1 kg m−2 at 89 GHz on average corresponds to a decrease in observed TB, relative to a cloud-free background, of 11 K. At 183 GHz, the decrease is about 34–53 K. We perform a similar analysis using the vertically integrated, transmission-weighted slant-path radar reflectivity Z*INT and find that ΔTB also decreases approximately linearly with (Z*INT)0.58. The exponent of 0.58 corresponds to the one we find in the purely DPR-retrieval-based ZINT–HWP relation. The observed sensitivities of ΔTB with respect to Z*INT and HWP* allow for the validation of hydrometeor scattering models.
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      Sensitivity of 89–190-GHz Microwave Observations to Ice Particle Scattering

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    contributor authorChen, Ruiyao;Bennartz, Ralf
    date accessioned2022-01-30T17:48:58Z
    date available2022-01-30T17:48:58Z
    date copyright7/6/2020 12:00:00 AM
    date issued2020
    identifier issn1558-8424
    identifier otherjamcd190293.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263984
    description abstractThe sensitivity of microwave brightness temperatures (TBs) to hydrometeors at frequencies between 89 and 190 GHz is investigated by comparing Fengyun-3C (FY-3C) Microwave Humidity Sounder-2 (MWHS-2) measurements with radar reflectivity profiles and retrieved products from the Global Precipitation Measurement mission’s Dual-Frequency Precipitation Radar (DPR). Scattering-induced TB depressions (ΔTBs), calculated by subtracting simulated cloud-free TBs from bias-corrected observed TBs for each channel, are compared with DPR-retrieved hydrometeor water path (HWP) and vertically integrated radar reflectivity ZINT. We also account for the number of hydrometeors actually visible in each MWHS-2 channel by weighting HWP with the channel’s cloud-free gas transmission profile and the observation slant path. We denote these transmission-weighted, slant-path-integrated quantities with a superscript asterisk (e.g., HWP*). The so-derived linear sensitivity of ΔTB with respect to HWP* increases with frequency roughly to the power of 1.78. A retrieved HWP* of 1 kg m−2 at 89 GHz on average corresponds to a decrease in observed TB, relative to a cloud-free background, of 11 K. At 183 GHz, the decrease is about 34–53 K. We perform a similar analysis using the vertically integrated, transmission-weighted slant-path radar reflectivity Z*INT and find that ΔTB also decreases approximately linearly with (Z*INT)0.58. The exponent of 0.58 corresponds to the one we find in the purely DPR-retrieval-based ZINT–HWP relation. The observed sensitivities of ΔTB with respect to Z*INT and HWP* allow for the validation of hydrometeor scattering models.
    publisherAmerican Meteorological Society
    titleSensitivity of 89–190-GHz Microwave Observations to Ice Particle Scattering
    typeJournal Paper
    journal volume59
    journal issue7
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-19-0293.1
    journal fristpage1195
    journal lastpage1215
    treeJournal of Applied Meteorology and Climatology:;2020:;volume( 59 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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