TRMM Observations of Polarization Difference in 85 GHz: Information about Hydrometeors and Rain Rate.

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書誌事項

公開日
2001
DOI
  • 10.2151/jmsj.79.701
公開者
公益社団法人 日本気象学会

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説明

Observations made by the Precipitation Radar (PR) and the Microwave Imager (TMI) radiometer on board the Tropical Rainfall Measuring Mission (TRMM) satellite help us to show the significance of the 85 GHz polarization difference, PD85, measured by TMI. Rain type, convective or stratiform, deduced from the PR allows us to infer that PD85 is generally positive in stratiform rain clouds, while PD85 can be markedly negative in deep convective rain clouds. Furthermore, PD85 increases in a gross manner as stratiform rain rate increases. On the contrary, in a crude fashion PD85 decreases as convective rain rate increases. From the observations of TMI and PR, we find that PD85 is a weak indicator of rain rate. Utilizing information from existing polarimetric radar studies, we infer that negative values of PD85 are likely associated with vertically-oriented small oblate or wet hail that are found in deep convective updrafts.

収録刊行物

  • 気象集誌. 第2輯

    気象集誌. 第2輯 79 (2), 701-707, 2001

    公益社団法人 日本気象学会

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