DOI: 10.1002/2017JD026956
Scopus记录号: 2-s2.0-85040732017
论文题名: Entropy-Aided Evaluation of Meteorological Droughts Over China
作者: Sang Y.-F. ; Singh V.P. ; Hu Z. ; Xie P. ; Li X.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 2 起始页码: 740
结束页码: 749
语种: 英语
英文关键词: climate change
; drought
; information entropy
; precipitation
; statistical characteristics
Scopus关键词: climate change
; climate conditions
; drought
; entropy
; information
; magnitude
; potential evapotranspiration
; precipitation (climatology)
; regional climate
; skewness
; spatial distribution
; spatial variation
; statistical analysis
; temporal variation
; valuation
; China
英文摘要: Evaluation of drought and its spatial distribution is essential to develop mitigation measures. In this study, we employed the entropy index to investigate the spatiotemporal variability of meteorological droughts over China. Entropy values, with a reliable hydrological and geographical basis, are closely related to the months of precipitation deficit and its mean magnitude and can thus represent the physical formation of droughts. The value of entropy index can be roughly classified as <0.35, 0.36–0.90, and >0.90, reflecting high, middle, and low occurrence probabilities of droughts. The accumulated precipitation deficits, based on the standardized precipitation-evapotranspiration index at the 1, 3, 6, and 12 month scales, consistently increase with entropy decrease, no matter considering the moderately, severely, or extremely dry conditions. Therefore, Northwest China and North China, with smaller entropy values, have higher occurrence probability of droughts than South China, with a break at 38°N latitude. The aggravating droughts in North China and Southwest China over recent decades are represented by the increase in both the occurrence frequency and the magnitude. The entropy, determined by absolute magnitude of the difference between precipitation and potential evapotranspiration, as well as its scatter and skewness characteristics, is easily calculated and can be an effective index for evaluating drought and its spatial distribution. We therefore identified dominant thresholds for entropy values and statistical characteristics of precipitation deficit, which would help evaluate the occurrence probability of droughts worldwide. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114677
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Department of Biological and Agricultural Engineering and Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, United States; Department of Geography, Hong Kong Baptist University, Hong Kong; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China; University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Sang Y.-F.,Singh V.P.,Hu Z.,et al. Entropy-Aided Evaluation of Meteorological Droughts Over China[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)