| SAPEI-Based spatial and temporal variation characteristics of drought in Xinjiang |
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| DOI：10.7606/j.issn.1000-7601.2023.04.29 |
| Key Words: SAPEI drought spatial and temporal variation characteristics Xinjiang |
| Author Name | Affiliation | | YU Jialu | State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
University of Chinese Academy of Sciences, Beijing 100049, China | | ZHANG Jing | State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
University of Chinese Academy of Sciences, Beijing 100049, China | | ZHANG Min | State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
University of Chinese Academy of Sciences, Beijing 100049, China | | YU Ruide | State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
University of Chinese Academy of Sciences, Beijing 100049, China
School of Environmental and Material Engineering, Yantai University, Yantai, Shandong 264005, China |
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| Abstract: |
| Standardized antecedent precipitation evapotranspiration index (SAPEI) is a new daily scale drought index and has exhibited more robust ability in describing and monitoring drought. Comparing with SPEI, SAPEI not only considers the balance of precipitation and evapotranspiration, but also the effect of moisture condition from the previous period to the current day. This paper discusses the spatial and temporal variation characteristics of drought in Xinjiang based on SAPEI based on meteorological data of 42 meteorological stations from 2000-2019, using linear trend, M-K test and inverse distance interpolation. In particular, this study first analyzes the spatial and temporal variation characteristics of SAPEI in Xinjiang since the 21st century. Further, the drought intensity is examined by zoning and intergeneration based on SAPEI. In addition, the regional and extensive seasonal variation of drought occurrence in Xinjiang and the spatial distribution of the frequency of different drought classes are investigated. The results show that Xinjiang becomes wet overall, and the wet and dry differences have widened in recent years, with some relatively wet areas becoming significantly drier spatially. Xinjiang becomes dry in spring and wet in summer, autumn and winter, with diametrically opposite differences between wet and dry changes in time and space between summer and winter. The drought intensity has significantly reduced in whole Xinjiang and sub\|regions over the past 20 years, with high intensity in the northeast and low intensity in the central and southwest. The range of drought in Xinjiang is narrowing down, but the level of drought has increased in recent years. Moreover, the range of spring drought is expanding. In addition, the frequency of different drought classes in Xinjiang is spatially distinct. The southern, northeastern, and northwestern parts of Northern Xinjiang suffer mild, moderate and severe drought, respectively, while Southern Xinjiang mainly suffers moderate and mild drought. Besides, the level of drought in the western part of Eastern Xinjiang is mainly mild, while the level in the eastern part of Eastern Xinjiang is mainly severe. |
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