Summer heat waves over Eastern China: dynamical processes and trend attribution

被引:89
作者
Freychet, Nicolas [1 ]
Tett, Simon [1 ]
Wang, Jun [2 ]
Hegerl, Gabriele [1 ]
机构
[1] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland
[2] Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China
关键词
heat waves; China; attribution; extreme weather events; TEMPERATURE EXTREMES; CLIMATE; INCREASE;
D O I
10.1088/1748-9326/aa5ba3
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Recent trends in summer heat waves (HW) over Central-Eastern China and their atmospheric drivers are investigated using the ERA Interim re-analysis. A composite analysis shows that these events are preceded by an increase in 500 hPa geopotential height. Consequently, a subsidence anomaly develops over the region and surface solar radiation increases. An increase in the northward moisture transport from the tropical region is also found to increase specific humidity, leading to warmer night-time temperatures. Feedback effects are also important: decrease of precipitation and enhanced evaporation also increases the specific humidity and North-Westerlies due to the low pressure lead to more heat convergence. HW occurrence increases, especially during the last decade, and is largely due to an increase in the mean temperature rather than to a change in dynamics, suggesting a human influence.
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页数:9
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