A comparative study between Mie and Rayleigh scattering assumption based estimation of Z-R relation and rainfall rate with TRMM/PR data

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  • ミー散乱およびレイリー散乱仮定に基づくＴＲＭＭ／ＰＲデータにおけるＺ‐Ｒ関係および降雨強度の比較
  • ミー散乱およびレイリー散乱仮定に基づくTRMM/PRデータにおけるZ-R関係および降雨強度の比較
  • ミー サンラン オヨビ レイリー サンラン カテイ ニ モトズク TRMM PR データ ニ オケル Z R カンケイ オヨビ コウウ キョウド ノ ヒカク

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A comparison of the rain rate estimated with the assumptions of Rayleigh and Mie scattering is made. We analyzed the different relationships between the radar reflective factor and rain rate (so-called Z-R relationship) with both scattering models for different DSD (droplet size distribution) and rainfall types as the wavelength is 2.2cm which is in accord with the band of TRMM/PR. Meanwhile we introduced a discrete ordinates method to retrieve the Z-R relationship for Mie scattering assumption. It is found that the retrieval result can be represented as the sum of some simple Z-R relationships. By the analysis of the Z-R relationships estimated from Rayleigh and Mie scattering assumptions in the rain types, we found that the difference of Z-R relationships between Rayleigh and Mie scattering in the thunderstorm that represents the larger raindrop size is larger than that in the drizzle that represent the smaller raindrop size.

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