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REMOTE SENSING OF MICROPHYSICAL AND RADIATIVE PROPERTIES OF ICE CLOUDS

Research Project

Project/Area Number 13440136
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

ASANO Shoji  Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (00089781)

Co-Investigator(Kenkyū-buntansha) OKAMOTO Hajime  Tohoku University, Graduate School of Science, Associate Prof., 大学院・理学研究科, 助教授 (10333783)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 2003: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2002: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2001: ¥7,100,000 (Direct Cost: ¥7,100,000)
KeywordsIce clouds / Remote sensing / Cloud Radar / Lidar / Cloud-physical properties / Radiative properties / Scattering by nonspherical particles / spectroscopic measurements / 95GHz雲レーダ / ライダー / 非球形粒子光散乱 / 分光日射計
Research Abstract

The major purpose of the present study is to develop a synergy observational technique to retrieve microphysical and radiative properties of ice clouds by combining the ground-based active and passive remote sensing, and to validate its effectiveness for the planed satellite-borne cloud radar and lidar for measuring ice clouds from space. We have developed the transfer computation scheme of shortwave (solar) and longwave (infrared) radiation for cloudy atmospheres with ice clouds. By using the computation scheme, we have simulated the observed radiative properties for mixed-phase clouds and mid-latitude cirrostratus clouds and studied the relationship between the microphysical properties and radiative properties of the clouds containing ice particles. A sensitivity study suggested that microphysical properties of mixed-phase clouds can be retrieved by using cloud radars with dual frequencies at 35-GHz and 95-GHz. Further, we have developed a quasi-analytic solution of the three-dimensi … More onal radiative transfer equation for inhomogeneous atmospheres. The preliminary computation showed cloud in homogeneity substantially affects the radiation fields, especially, of the transmitted radiances ; this suggests that remote sensing of cloud properties from the transmitted solar radiance measurements is not-practical.
We have developed a new forward algorithm for the retrieval of effective size and ice water content of ice clouds by using a 95-GHz cloud radar collocated with an optical lidar of wavelength at 0.532 μm. The algorithm enables us to estimate vertical profiles of the ice cloud microphysical properties. We have tested the performance of the algorithm through numerical simulations for potential sources of such errors as ice crystal orientation, shapes of size distribution, multiple scattering effects to lidar signals, and observational biases in the radar and lidar signals. We applied the retrieval algorithm to the ground-based and shipboard observation data for cirrus clouds, and found a close correlation between effective size and fall velocity of ice crystals. The results from the present study will be useful for improving ice cloud remote sensing and cloud-radiation schemes in climate models. Less

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] H.Okamoto, S.Iwasaki, M.Yasui, H.Horie, H.Kuroiwa, H.Kumagai: "An algorithm for retrieval of cloud microphysics using 95-GHz cloud radar and lidar."Journal of Geophysical Research. 108・D7 4226. doi:10.1029/2001JD001225 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Okamoto: "Information content of the 95GHz cloud radar siganls : Theoretical assessment of non-sphericity and error evaluation of the discrete dipole approximation"Journal of Geophysical Research. 107・D22 4628. doi:10.1029/2001JD001386 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Yoshida, S.Asano, A.Yamamoto, N.Orikasa, A.Yamazaki: "Radiative properties of mid-latitude ice-clouds observed by the shortwave and longwave radiometer-sondes."Journal of the Meteorological Society of Japan. 82・2. 639-656 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Asano, Y.Yoshida, Y.Miyake, K.Nakamura: "Development of a radiometer-sonde for simultaneously measuring the downward acid upward broadband fluxes of shortwave and longwave radiation."Journal of the Meteorological Society of Japan. 82・2. 623-637 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Asano, A.Uchiyama, A.Yamazaki, J.-F.Gayet, M.Tanizono: "Two case studies of winter continental-type water and mixed-phased stratocumuli over the sea. II : Absorption of solar radiation"Journal of Geophysical Research. 107・D21 4570. doi:10.1029/2001JD001108 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Nishizawa, S.Asano, A.Uchiyama, A.Yamazaki: "Seasonal variation of aerosol direct radiative forcing and optical properties estimated from ground-based solar radiation measurements."Journal of the Atmospheric Sciences. 61・1. 57-72 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 新田, 伊藤, 木村, 住, 安成(編集), 浅野(分担執筆): "キーワード 気象の事典"朝倉書店. 520 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Asano, S., A.Uchiyama, A.Yamazaki, J.-F.Gayet, M.Tanizono: "Two case studies of winter continental-type water and mixed-phased stratocumuli over the sea. II : Absorption of solar radiation"J.Geophys.Res.. 107(D21). 4570,doi:10.1029/2001JD001108 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Asano, S., Y.Yoshida, Y.Miyake, K.Nakamura: "Development of a radiometer-sonde for simultaneously measuring the downward and upward broadband fluxes of shortwave and longwave radiation."J.Meterol.Soc.Jpn.. 82. 623-637 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Nishizawa, T., S.Asano, A.Uchiyama, A.Yamazaki: "Seasonal variation of the aerosol direct radiative forcing and optical properties estimated from the ground-based solar radiation measurements."J.Atmos.Sci.. 61-1. 57-72 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Okamoto, H.: "Information content of the 95GHz cloud radar signals : Theoretical assessment of non-sphericity and error evaluation of the discrete dipole approximation"J.Geophys.Res.. 108(D22). 4628,doi:10.1029/2001JD001386 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Okamoto, H., S.Iwasaki, M.Yasui, H.Horie, H.Kuroiwa, H.Kumagai: "An algorithm for retrieval of cloud microphysics using 95-GHz cloud radar and lidar"J.Geophys.Res.. 108(D7). 4226,doi:10.1029/2001JD0001225 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshida, Y., S.Asano, A.Yamamoto, N.Orikasa, A.Yamazaki: "Radiative properties of mid-latitude frontal ice-clouds observed by the shortwave and longwave radiometer-sondes"J.Meterol.Soc.Jpn.. 82. 639-656 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Asano, S.: "Items on Atmospheric Optics (Key Word Encyclopedia of Meteorology (Ed., T.Nitta, T.Ito, R.Kimura, A.Sumi, and T.Yasunari))(in Japanese)"Asakurasyoten. 520 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Yoshida: "Radiative properties of mid-latitude ice-clouds observed by the shortwave and longwave radiometer-sondes"Journal of the Meteorological Society of Japan. 82・2(in print). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Asano: "Development of a radiometer-sonde for simultaneously measuring the downward and upward broadband fluxes of shortwave and longwave radiation"Journal of the Meteorological Society of Japan. 82・2(in print). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Nishizawa: "Seasonal variation of aerosol direct radiative forcing and optical properties estimated from ground-based solar radiation measurements"Journal of the Atmospheric Sciences. 61・1. 57-72 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Okamoto: "An algorithm for retrieval of cloud microphysics using 95-GHz cloud rader and lidar"Journal of Geophysical Research. 107・D22. AAC4.1-AAC4.16 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Michalsky: "Broadband shortwave calibration results from the Atmospheric Radiation Measurement Enhanced Shortwave Experiment II"Journal of Geophysical Research. 107・D16. AAC3-1-AAC3-13 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.-F.Gayet: "Two case studies of winter continental-type and mixed-phased stratocumuli over the sea. I : Microphysical and optical properties"Journal of Geophysical Research. 107・D21. AAC11-1-AAC11-15 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Asano: "Two case studies of winter continental-type and mixed-phased stratocumuli over the sea"Journal of Geophysical Research. 107・D21. AAC12-1-AAC12-15 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Okamoto: "Information content of the 95-GHz cloud radar signals : Theoretical assessment of effects of nonsphericity and error evolution of the discrete dipole approximation"Journal of Geophysical Research. 107・D22. AAC4-1-AAC4-16 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Okamoto: "An algorithm for retrieval of cloud microphysics using 95-GHz cloud radar and Lidar"Journal of Geophysical Research. 108・D(in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 浅野 正二: "大気の日射吸収をめぐる話題:「異常吸収」は無い"天気. 49・1. 83-89 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 新田 尚: "キーワード 気象の事典"朝倉書店. 520 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Asano: "Two case studies of winter continental-type and mixed-phased stratocumuli over the sea II : Absorption of solar radiation"Journal of Geophysical Research. 107・in print. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] J.F.Gayet: "Two case studies of winter continental-type and mixed-phased stratocumuli over the sea I : Microphysical and optical properties"Journal of Geophysical Research. 107・in print. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Iwasaki: "Analysis of the enhancement of backscattering by nonspherical particles with flat surfaces"Apples Optics. 40. 6121-6129 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Okamoto: "Observation of clouds by 95 GHz-radar and systems : radius versus fall velocity"IRS 2000 : Current Problems in Atmospheric Radiation (Ed. W. L. Smith and Yu. M. Timofeyev), A. Deepak Publishing. 981-984 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Iwasaki: "Analysis of lidar returns from rectangles and hexagonal ice crystals"IRS 2000 : Current Problems in Atmospheric Radiation (Ed. W. L. Smith and Yu. M. Timofeyev), A. Deepak Publishing. 999-1002 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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