Multi-scale assessments of droughts: A case study in Xinjiang, China

The Science of the Total Environment
Junqiang YaoRuibo Zhang

Abstract

Understanding the multi-scale variation of drought is essentially important in drought assessment. Now, a comprehensive assessment is still lacking on the meteorological, ecological and hydrological drought perspectives. In order to better investigate multi-scale droughts, we carried out a comprehensive analysis of their long-term variation based on the two drought indices and observation data in Xinjiang, China, from 1961 to 2015. The two indices are the Standardized Precipitation Index (SPI) and the Standardized Precipitation Evapotranspiration Index (SPEI). The results show that the SPI and SPEI are highly consistent for most stations and time scales in Xinjiang. Based on multi-scale and considered evaporative demand, the SPEI from 1961 to 2015 showed a wetting trend followed by a drying trend (as of 1997), giving an overall slight drying trend (-0.0122±0.0043 per year) for the 54-year period. We assessed the sensitivity of the two drought indices to precipitation (P) and potential evapotranspiration (PET) and found that the SPEI shows different sensitivity to P and PET. In arid regions characterized by high PET, drought severity is mostly determined by changes in PET. The intensified warming and diminished precipitation in ...Continue Reading

Citations

Aug 15, 2019·Environmental Monitoring and Assessment·Xingming HaoYing Zhang
Jul 10, 2020·International Journal of Environmental Research and Public Health·Haochen YuFu Chen
Apr 23, 2021·Environmental Science and Pollution Research International·Yuanhe YuHuan Deng
Aug 18, 2021·Environmental Science and Pollution Research International·Dehe XuDe Zhang

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