Application of TRMM Precipitation Radar Data to Meso-Scale Model MM5

XU Zhi-fang;GE Wen-zhong;DANG Ren-qing;LANG Xu-xing;Toshio Iguchi

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Plateau Meteorology ›› 2004, Vol. 23 ›› Issue (5) : 635-642.

Application of TRMM Precipitation Radar Data to Meso-Scale Model MM5

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Abstract

Numerical simulations of two heavy rain cases in the Changjiang-Huaihe river basin have been carried out with TRMM/PR (Tropical Rainfall Measuring Mission/Precipitation Radar) data incorporating into the PSU/NCAR meso-scale model MM5.First, rainwater mixing ratio qr is obtained from different Z-qr relations variating with height.Then, while specific humidity q'v in the model is replace with qv, where q'v=qv+qr.Based on the above idea, TRMM/PR data is used to modify humidity obtained by conventional radiosound data.Simulation are performed and compared with the control run.The results show that both the heavy rainfall distribution and its heavy rain core amounts in sensitivity run are better than in control one.

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TRMM/PR / Numerical simulation / Rainwater mixing rat / Spcial humidity / Heavy rain core

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XU Zhi-fang , GE Wen-zhong , DANG Ren-qing , LANG Xu-xing , Toshio Iguchi. Application of TRMM Precipitation Radar Data to Meso-Scale Model MM5. Plateau Meteorology. 2004, 23(5): 635-642

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