气候变化领域集成服务门户(CCPortal): Developing a hybrid drought index: Precipitation Evapotranspiration Difference Condition Index

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DOI	10.1016/j.crm.2020.100238
	Developing a hybrid drought index: Precipitation Evapotranspiration Difference Condition Index
	Tian L.; Leasor Z.T.; Quiring S.M.
发表日期	2020
ISSN	2212-0963
起始页码	2729
结束页码	2747
卷号	29
英文摘要	Drought indices are widely used for drought quantification. The objective of this study is to introduce a hybrid drought index, the Precipitation Evapotranspiration Difference Condition Index (PEDCI), and to compare its performance in Oklahoma to existing drought indices. The PEDCI is based on a simple water balance model, which accounts for the difference between water supply (precipitation) and water demand (potential evapotranspiration). While it is similar in this respect to the Standardized Precipitation and Evapotranspiration Index (SPEI) and the Palmer Drought Severity Index, it uses a different method to normalize the index in time and space which was inspired by Vegetation Condition Index. The performance of the PEDCI is evaluated quantitatively using SPEI, soil moisture data, and crop yield data. The performance of the PEDCI is also evaluated qualitatively using six criteria. Results show that the PEDCI is highly correlated with SPEI and that it can represent drought conditions in Oklahoma as effectively as the SPEI. Correlations between the PEDCI and soil moisture/crop yield also demonstrate good correspondence. The qualitative evaluation of PEDCI shows that there are two key strengths in comparison to the SPEI. First, it is simple to calculate and interpret. Second, the normalization method does not require any empirical parameters or fitting a probability distribution function. The PEDCI can be used to characterize drought conditions on a variety of timescales and it has utility for monitoring agricultural and meteorological drought, especially in a changing climate. © 2020 The Author(s)
英文关键词	Drought; Evapotranspiration; Soil moisture; Standardized precipitation evapotranspiration index
来源期刊	Climate Risk Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183176
作者单位	Climate Science Laboratory, Department of Geography, Texas A&M University, College Station, TX, United States; Atmospheric Sciences Program, Department of Geography, The Ohio State University, Columbus, OH, United States
推荐引用方式 GB/T 7714	Tian L.,Leasor Z.T.,Quiring S.M.. Developing a hybrid drought index: Precipitation Evapotranspiration Difference Condition Index[J],2020,29.
APA	Tian L.,Leasor Z.T.,&Quiring S.M..(2020).Developing a hybrid drought index: Precipitation Evapotranspiration Difference Condition Index.Climate Risk Management,29.
MLA	Tian L.,et al."Developing a hybrid drought index: Precipitation Evapotranspiration Difference Condition Index".Climate Risk Management 29(2020).