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Entropy-Aided Evaluation of Meteorological Droughts Over China
Sang, Yan-Fang1,2; Singh, Vijay P.3,4; Hu, Zengyun5; Xie, Ping6; Li, Xinxin1,7
2018-01-27
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
Volume123Issue:2Pages:740-749
Corresponding AuthorSang, Yan-Fang(sangyf@igsnrr.ac.cn)
AbstractEvaluation 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 12month 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 degrees 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.
Keywordinformation entropy drought precipitation statistical characteristics climate change
DOI10.1002/2017JD026956
WOS KeywordPRECIPITATION EVAPOTRANSPIRATION INDEX ; HYDROLOGICAL DROUGHTS ; UNITED-STATES ; INFORMATION ; TEMPERATURE ; SENSITIVITY ; IMPACTS ; EVENTS ; EUROPE ; HAZARD
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[91647110] ; National Natural Science Foundation of China[91547205] ; National Natural Science Foundation of China[11401569] ; National Natural Science Foundation of China[41330529] ; Program for the Bingwei Excellent Talents from the Institute of Geographic Sciences and Natural Resources Research, CAS ; Youth Innovation Promotion Association CAS[2017074] ; National Mountain Flood Disaster Investigation Project[SHZH-IWHR-57]
Funding OrganizationNational Natural Science Foundation of China ; Program for the Bingwei Excellent Talents from the Institute of Geographic Sciences and Natural Resources Research, CAS ; Youth Innovation Promotion Association CAS ; National Mountain Flood Disaster Investigation Project
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000425520200007
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/56981
Collection中国科学院地理科学与资源研究所
Corresponding AuthorSang, Yan-Fang
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing, Peoples R China
2.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA
3.Texas A&M Univ, Dept Biol & Agr Engn, College Stn, TX USA
4.Texas A&M Univ, Zachry Dept Civil Engn, College Stn, TX USA
5.Hong Kong Baptist Univ, Dept Geog, Hong Kong, Hong Kong, Peoples R China
6.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan, Hubei, Peoples R China
7.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Sang, Yan-Fang,Singh, Vijay P.,Hu, Zengyun,et al. Entropy-Aided Evaluation of Meteorological Droughts Over China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(2):740-749.
APA Sang, Yan-Fang,Singh, Vijay P.,Hu, Zengyun,Xie, Ping,&Li, Xinxin.(2018).Entropy-Aided Evaluation of Meteorological Droughts Over China.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(2),740-749.
MLA Sang, Yan-Fang,et al."Entropy-Aided Evaluation of Meteorological Droughts Over China".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.2(2018):740-749.
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