Assessment of an Evapotranspiration Deficit Drought Index in Relation to Impacts on Ecosystems

查看全文 作　　者：Xia [1,2]ZHANG;Mingxing [1]LI;Zhuguo [1,2]MA;Qing [1]YANG;Meixia [1]LV;Robin [3]Clark

机构地区：[1]Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;[2]University of Chinese Academy of Sciences, Beijing 100049, China;[3]Met Office Hadley Centre, Exeter EX 1 3PB, UK

出　　处：《Advances in Atmospheric Sciences》索引2019年第36卷第11期,共15页

基　　金：sponsored by the National Key R&D Program of China (Grant No. 2018YFA0606002);the National Natural Science Foundation of China (Grant Nos. 41575087 and 41875082);the UK–China Research & Innovation Partnership Fund through the Met Office Climate Science for Service Partnership (CSSP) China as part of the Newton Fund 摘　　要：Ecosystems have increasingly been subject to the challenge of heavy drought under global warming. To quantitatively evaluate the impacts of drought on ecosystems, it is necessary to develop a drought index that can sensitively depict the response of vegetation to drought evolution at a biological time scale. For the ability of direct connection between climate and ecosystem by deficit of evapotranspiration, in the present study, a drought index was defined based on standardized evapotranspiration deficit (SEDI), according to the difference between actual and potential evapotranspiration, to meet the need for highlighting drought impacts on ecological processes. Comparisons with traditional indices show that SEDI can reasonably detect droughts and climatic dry and wet transitions, especially at a monthly time scale, and can also regenerate long-term trends. Moreover, SEDI can more sensitively capture the biological changes of ecosystems in response to the dynamics of drought intensity, compared with the indices of precipitation and temperature. SEDI is more practical than the precipitation and temperature indices to highlight signals of biological effects in climate droughts. Hence, it has potential for use in assessments of climate change and its impact on ecosystems. 关键词：EVAPOTRANSPIRATION DROUGHT INDEX vegetation ECOSYSTEM leaf area INDEX climate change

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Assessment of an Evapotranspiration Deficit Drought Index in Relation to Impacts on Ecosystems

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