Tower mast of precipitation over the central Tibetan Plateau summer
Tower mast of precipitation over the central Tibetan Plateau summer
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DOI：
10.1029/2005gl024713
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发表时间：
2006-03-04
影响因子：
5.2
通讯作者：
Liu, Q
中科院分区：
文献类型：
--
作者：
Fu, YF;Liu, GS;Liu, Q
在青藏高原上空，太阳加热经常在大气中产生强对流不稳定。利用1998-2000年的TRMM降水雷达资料，研究发现高原降水在高度-经度和高度-纬度剖面上均呈塔桅形。高原高雨率中心位于6 km以上，与附近背景相比，高原高雨率中心呈塔状伸入对流层中层，这意味着高原有一个独特的潜热热源直接注入中层大气。结果表明，高原地区孤立雨胞比邻近地区多，高原地区降水日变化最强，峰值出现在当地时间1600左右，谷值出现在当地时间0500左右，表明高原地区的对流云主要是由太阳加热引起的。同时也发现TRMM演算法可能将弱对流错误地归类为层状雨。
Over the Tibetan Plateau, solar heating often produces strong convective instability in the atmosphere. Using 3 years (1998-2000) of Tropical Rainfall Measuring Mission (TRMM) precipitation radar data, our investigations revealed a tower mast shape of precipitation over the Plateau in both height-longitude and height-latitude cross-sections. High rain rate center over the Plateau is located above 6km as a tower penetrating into the mid-troposphere against the nearby background, implying a unique latent heating source injecting directly to the middle atmosphere. Results indicate that there are more isolated rain cells over the Plateau than its nearby regions, and the strongest diurnal cycle of rainfall existing over the Plateau with a peak around 1600 and a valley around 0500 local time, indicating the dominance of convective clouds caused by solar heating. It is also found that the TRMM algorithm might have misclassified weak convections as stratiform rains.