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首页> 外文会议>Conference on Microwave Remote Sensing of the Atmosphere and Environment II, Oct 9-12, 2000, Sendai, Japan >Mesoscale Structures of Stratiform Precipitation on the Tibetan Plateau Using an X-band Doppler Radar and TRMM PR
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Mesoscale Structures of Stratiform Precipitation on the Tibetan Plateau Using an X-band Doppler Radar and TRMM PR

机译：X波段多普勒雷达和TRMM PR对青藏高原层状降水的中尺度结构

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摘要

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 had a low echo top.
机译：为了阐明降雨系统的演变和中尺度结构，1997年和1998年对青藏高原进行了首次多普勒雷达观测。 TRMM卫星还观测了1998年西藏地区的降雨。TRMM的降水雷达（PR）探测到了西藏的每日降水周期。白天的对流和晚上大雨区的层状降水都带来了很多降雨。进行了案例研究以阐明层状降雨的结构。 7月7日晚上，高原南部出现了一个天气收敛区。在降雨开始时，小型对流回波和层状回波共存于雷达范围内。在6 km ASL以上，西南风为主，但在6 km ASL以下，风向在降雨过程中是可变的。 7月8日，在雷达站点上发现了西南风和北风之间的冷锋。在距地面垂直剖面8km ASL以下，随着冷锋面的通过，观测到了从西风向西北的突然风向变化。额叶通道的降水呈层状，回波顶低。

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