%0 Journal Article %A WANG Jianjiang %A MA Hao %A YU Liping %A GONG Liqing %A WANG Chen %T Analysis of Atmospheric Circulation Characteristics Associated with Autumn Drought over Zhejiang Province in 2019 %D 2021 %R %J Journal of Arid Meteorology %P 1-7 %V 39 %N 1 %X A provincial drought situation occurred in autumn 2019 in Zhejiang, especially in the central and western part of Zhejiang Province. Precipitation in autumn 2019 broke the least record in history, and the temperature anomaly was 1.5 ℃ at most of stations. Based on observation data of precipitation and temperature from 67 normal stations in Zhejiang Province and the NCEP-NCAR reanalysis data, the drought causes over Zhejiang Province in 2019 were analyzed systemically. Such severe autumn drought was directly caused by continuous less precipitation and high temperature. The main part of the polar vortex on 500 hPa was located in the Western Hemisphere, thus cold air intensity over Asia was relatively weak, furthermore, the East Asia trough position was eastward and northward, which was hard to cause the cold air to affect Zhejiang. The more intensive of western Pacific subtropical high (WPSH) and associated northward location of the ridge line and westward advance of the westward ridge point, the abnormal high pressure over South Asia, distinct downdraft over Zhejiang, the narrower-span and slower updraft of Hadley Cell and subsequent weaker northward transport of weaker vapor, stronger moisture divergence in the mid-lower troposphere worked together to bring about the typical drought climate in Zhejiang in autumn 2019.
Key words: drought; atmospheric circulation; western Pacific subtropical high; cause

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