Two Types of Flash Drought and Their Connections with Seasonal Drought

作     者：Linying WANG Xing YUAN 

作者机构：Key Laboratory of Regional Climate–Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2018年第35卷第12期

页      面：1478-1490页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the National Key R&D Program of China (2018YFA0606002) the National Natural Science Foundation of China (91547103) the China Special Fund for Meteorological Research in the Public Interest (Grant No. GYHY201506001) the General Financial Grant from the China Postdoctoral Science Foundation (2018M631553) 

主　　题：flash drought climate change soil moisture evapotranspiration seasonal drought 

摘      要：Flash drought is a rapidly intensifying drought with abnormally high temperature,which has greatly threatened crop yields and water supply,and aroused wide public concern in a warming ***,the preferable hydrometeorological conditions for flash drought and its association with conventional drought at longer time scales remain ***,we investigate two types of flash drought over China:one is high-temperature driven(Type Ⅰ),while the other is water-deficit driven(Type Ⅱ).Results show that the frequencies of the two types of flash drought averaged over China during the growing season are *** I flash drought tends to occur over southern China,where moisture supply is sufficient,while Type Ⅱ is more likely to occur over semi-arid regions such as northern *** types of flash drought increase significantly(p0.01)during 1979–2010,with a doubled rise in Type Ⅰ as compared with Type Ⅱ.Composite analysis shows that high temperature quickly increases evapotranspiration(ET)and reduces soil moisture from two pentads before the onset of Type Ⅰ flash *** contrast,there are larger soil moisture deficits two pentads before the onset of Type Ⅱ flash drought,leading to a decrease in ET and increase in *** flash drought associated with seasonal drought,there is a greater likelihood of occurrence during the onset and recovery phases of seasonal drought,suggesting perfect conditions for flash drought during transition *** study provides a basis for the early warning of flash drought by connecting multiscale drought phenomena.