Development of a TRMM/TMI Algorithm for Precipitation in the Tibetan Plateau by Considering Effects of Land Surface Emissivity

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概要

• 論文の詳細を見る

• This paper ploposes a new algorithm for precipitation over Iand by deriving the optical thickness from the brightness temperature of the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI). The effect of land surface controlled by soil moisture emissivity on radiation transfer is taken into account in thj5 algorithm This means that soil moisture can be estimated at the same time in addition to precitation. Based on a microwave radiative transfer equation, two indices, Index of Soil Wetness (lSW) and Polariation Index (PI) , which remove the effect of land surface physical temperature, are introduced into the algorithm. Surface roughness effects on land surface emmissivity are included by using the polarization mixiug ratio and the surface roughness. The application of the algorithm to the GAMB-Tibet meso-scale experimental field shows a good agreement with the spatial patterns of precipitation observed by the 3D Doppler radar. The estimated soil moisture shows good correspondence with the observed one. The relationship between the optical thickness and precipitation was also investigated

• 社団法人日本気象学会の論文
• 2001-03-25

著者

• KOIKE Toshio

  Department of Civil Engineering, The University of Tokyo

• Koike Toshio

  Department Of Civil Engineering The University Of Tokyo

• Koike Toshio

  Department Of Civil Engineering University Of Tokyo

• Fujii Hideyuki

  Japan Science And Technology Corporatian : Department Of Civil Engineering University Of Tokyo

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