Scale of meteorological drought index suitable for characterizing agricultural drought: A case study of Hunan Province
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Abstract:
Standard Precipitation Evapotranspiration Index (SPEI) is one of the most w idely used meteorological drought indexes globally for drought monitoring. Determining the appropriate SPEI time scale is the premise of using SPEI for monitoring agri cultural drought. Taken the latest national soil moisture reanalysis products as a rference,the most suitable SPEI time scale for haracderizing agricult ural drought in Hunan Province is det ermined based on maximum correlation analysis and then the spatial and tem poral evolution characteristics of agriultural drought in H unan Province from 1960 to 2014 is analyzed.The results showed that: the most suitable timescale of SPEI to characterize agricultural drought is SPEI6 in the whole province; the agricultural drought characterized by SPEF-6 showed an insignificant decrease trend from 1960 to 2014 in the whole province,the frequency of moderate and severe droughts was 14. 4% on average, and the frequency of severe and extreme droughts was 4.9% on average; in terms of seasonal distribution, moderate and severe droughts have the highest frequency in winter, followed by autumn; severe and extreme droughts also have the highest frequency in winter, followed by spring; regarding interdecadal variations, the frequency of agricultural drought in the whole province was highest in the1960s and then continued to decrease, reaching the lowest value in the 1990s and rapidly increasing in the 2000s.
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