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Proceedings Paper

Mesoscale structures of stratiform precipitation on the Tibetan Plateau using an X-band Doppler radar and TRMM PR
Author(s): Shuji Shimizu
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Paper Abstract

The first Doppler radar observation on the Tibetan Plateau was conducted for the GEWEX/GAME-Tibet project in 1997 and 1998 in order to clarify the evolution and mesoscale structure of the rainfall system. The TRMM satellite also observed the rainfall in the Tibetan area in 1998. TRMM's precipitation radar (PR) detected a diurnal cycle of rainfall in Tibet. Much rainfall was brought both by convection in the daytime and by stratiform precipitation over a wide rain area in the evening. A case study was conducted to clarify the structure of stratiform rainfall. On 7 July, a synoptic convergence area developed in the southern part of the Plateau in the evening. Small convective echoes and stratiform echoes coexisted in the radar coverage at the beginning of the rainfall. Southwesterly wind dominated above the 6km ASL, but the wind direction below 6km ASL was variable during the rainfall. On 8 July, a cold front between southwesterly wind and northerly wind was detected over the radar site. A sudden wind direction change from westerly to northwesterly was observed below 8km ASL from the vertical profiles at the radar site with the passage of the cold frontal surface. The precipitation with the frontal passage was stratiform and has a low echo top.

Paper Details

Date Published: 21 December 2000
PDF: 9 pages
Proc. SPIE 4152, Microwave Remote Sensing of the Atmosphere and Environment II, (21 December 2000); doi: 10.1117/12.410617
Show Author Affiliations
Shuji Shimizu, National Space Development Agency of Japan (Japan)

Published in SPIE Proceedings Vol. 4152:
Microwave Remote Sensing of the Atmosphere and Environment II
Thomas T. Wilheit; Harunobu Masuko; Hiroyuki Wakabayashi, Editor(s)

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