| Applicability analysis of four drought indices for meteorological drought monitoring in Northern China |
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| DOI：10.7606/j.issn.1000-7601.2019.01.36 |
| Key Words: drought indexes drought monitoning SPEI index applicability analysis Northern China |
| Author Name | Affiliation | | RONG Jin-meng | Meteorological Service Center of Qinghai, Xining, Qinghai 810001, China | | ZHOU Dan | Meteorological Service Center of Qinghai, Xining, Qinghai 810001, China | | LUO Jing | Qinghai Engineering Consulting Center, Xining, Qinghai 810001, China | | ZHU Hai-ling | Qinghai Engineering Consulting Center, Xining, Qinghai 810001, China | | GUO Guang | Meteorological Service Center of Qinghai, Xining, Qinghai 810001, China |
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| Abstract: |
| We used meteorological data from representative stations selected from 69 meteorological stations in Northern China to study meteorological drought in a timeframe of 1, 3, and 12 months using CI、SPEI、SPI and Z indexes. The consistency of the existing drought and calculated indexes were also compared. The results showed that: (1) The drought frequency calculated using the CI was 7%~14% higher than the actual events while the Z in certain areas for different seasons were 6%~12% lower and SPI for seasonal scale was 6% lower; (2) The best correlation between the four drought indices and actual statistics was SPEI, which expressed 57.41%, 60.78%, 57.06%, and 66.99% of all 4 indexes. The least correlations were with Z, which described 40.85%, 34.94%, 41.56%, and 38.24% of the 4 indexes in the four regions. Therefore, SPEI was most suitable for drought monitoring, mutation detection, drought intensity, levels of spatial and temporal distribution in Northern China. |
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