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Circulation Configuration of Synoptic System and Radar Echo Characteristics of Shorttime Heavy Rainfall in Xinjiang
YANG Tao, YANG Lianmei, ZHANG Yunhui, ZHUANG Xiaocui, HUANG Yan
Journal of Arid Meteorology    2021, 39 (4): 631-640.  
Abstract336)      PDF(pc) (5514KB)(1619)       Save
Based on the hourly precipitation observation data of 105 national stations and 1240 regional stations and 8 Doppler weather radars data in Xinjiang from 2010 to 2018, from the perspective of operational forecasting, the definition of shortterm heavy precipitation process in Xinjiang was proposed and 468 shortterm heavy precipitation processes were selected, and circulation configuration of influence system and radar observation characteristics were analyzed. The results show that there were four kinds of influence systems including the central Asia trough (vortex), the west Siberian trough (vortex) and low level northwest jet stream. The convective storms resulting in shortterm heavy rainfall were combined enhancement type, train effect type and isolated convective cell type, and the combined enhancement type was 45.1%, isolated convective cell type was 34.8%, and the train effect type was 20.2%, respectively. The parameter thresholds of the maximum reflectivity factor intensity (Zmax), the maximum height of the strong echo (Dmax), the maximum height of the echo top (ET) and the maximum vertical accumulated liquid water content (VIL) observed by Doppler radar during shortterm heavy precipitation processes in southern Xinjiang were less than those in northern Xinjiang, and in Yili prefecture they were largest and in Aksu they were smallest. The shortterm heavy precipitation in Yili prefecture was dominated by low centroid echo, while in other regions it was dominated by low centroid and high centroid echo.



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