Drought across Northwest China in late spring has exerted a vital effect on the local climate and agricultural production,and has been alleviated during the past decades.This study explored the influence of the preced-ing Arctic sea ice on the May drought in Northwest China caused by the precipitation deficit.Further analysis indicated that when the Greenland Sea ice concentration is abnormally high during February to April,the dry conditions in Northwest China tend to be alleviated.The increase of sea ice in the Greenland Sea can excite a meridional circulation,which causes sea surface temperature(SST)anomalies in the North Atlantic via the sea-air interaction,manifested as significant warm SST anomalies over the south of Greenland and the subtropical North Atlantic,but negative SST anomalies over the west of the Azores.This abnormal SST pattern maintains to May and triggers a zonal wave train from the North Atlantic through Scandinavia and Central Asia to Northwest China,leading to abnormal cyclones in Northwest China.Consequently,Northwest China experiences a more humid climate than usual.
Arctic sea iceGreenland SeaNorth Atlantic SSTDroughtNorthwest China
Yang Liu、Huopo Chen
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Nansen-Zhu International Research Centre,Institute of Atmospheric Physics Chinese Academy of Sciences,Beijing,China
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University for Information Science and Technology,Nanjing,China
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