| Suitability assessment of four common meteorological drought indices in Xinjiang |
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| DOI：10.7606/j.issn.1000-7601.2025.03.26 |
| Key Words: meteorological drought index applicability analysis soil moisture river runoff terrestrial water storage Xinjiang region |
| Author Name | Affiliation | | CHEN Zhen | College of Computer and Information Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | CAI Chaochao | College of Computer and Information Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Xinjiang Agricultural Informatization Engineering Technology Research Center, Urumqi, Xinjiang 830052, China | | MA Nan | College of Computer and Information Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | DAI Shuo | College of Computer and Information Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | WANG Zhenlu | College of Computer and Information Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| Four commonly used meteorological drought indices (SPI, SPEI, PDSI, and SC-PDSI) were applied to Xinjiang from 2001 to 2022 to analyze their correlation with soil moisture, river runoff, and terrestrial water storage, as well as their responsiveness to historically significant drought periods. Additionally, the Mann-Kendall mutation test and trend analysis were employed to assess the spatial and temporal variations of the four indices and evaluate their suitability for drought monitoring in Xinjiang. The results showed that: (1) The PDSI index showed the strongest correlation with soil moisture and river runoff, and the correlation with the change of terrestrial water storage was second only to SC-PDSI. In the reflection of typical drought events, the PDSI index performed best. (2) Overall, Xinjiang was in a wet state. Over the time series, all four drought indices indicate a slight drying trend during the study period (with trend values around -0.01), and the timing and frequency of dry and wet mutation points varied. (3)On the whole, in terms of spatial distribution, the degree of drought in northern, central and south\|central Xinjiang was higher than that in western and eastern parts of Xinjiang. Compared with the PDSI, the SC-PDSI showed a wider range of trend rate changes (from -0.3054 to 0.3237) than the other three drought indices. Its representation of dry and wet conditions was overly exaggerated, whereas the SPI tended to understate these changes. The SPEI showed a similar pattern to the PDSI. Overall, the PDSI proved to be more suitable for assessing drought conditions in Xinjiang than the other three indices. |
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