| Drought characteristics analysis of Henan Province based on standardized precipitation index in recent 45 years |
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| DOI：10.7606/j.issn.1000-7601.2021.04.21 |
| Key Words: drought grade drought intensity Henan Province standardized precipitation index |
| Author Name | Affiliation | | SHANG Dongyao | CMA/Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou, Henan 450003, China | | ZHANG Zhihong | CMA/Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou, Henan 450003, China | | YUE Yuan | Jilin Meteorological Observatory, Changchun, Jilin 130062, China | | HU Chengda | CMA/Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou, Henan 450003, China | | WANG Qi | Jilin Provincial Institute of Meteorological Science, Changchun, Jilin 130062, China |
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| Abstract: |
| This study was toanalyze temporal and spatial evolution law of drought intensity, influence range and occurrence frequency within Henan Province based on monthly precipitation data of 45 meteorological stations during the last 45 years in Henan Province. The standardized precipitation index was adopted as the drought index. The analysis results showed that: (1) In the past 45a, the drought in Henan Province had an obvious periodicity and an increasing trend in recent years. From the perspective of station order ratio, the annual drought station order ratio showed the change form of increasing first and then decreasing in stages.There were more regional and local droughts within the whole province, which were 11 a and 12 a respectively. In spring, summer and autumn, the sub\|ratios of drought stations showed a rising trend, with the rising rates being 1%·10a-1, 5.5%·10a-1 and 9.6%·10a-1, respectively. Of which summer drought was mostly locally, while spring and autumn were mostly dry in entire region, which were 13 a and 12 a respectively. (2) The average frequency of drought in the province was 9.83%, and the frequency of drought in autumn was 17.53%, which was higher than that of other three seasons. The Shangqiu area in the east and Sanmenxia area in the west of Henan Province were the areas with high incidence of annual and seasonal drought. The annual scale drought intensity and the drought station sub\|ratio were consistent in time, and both had 2\|6\|year periodicity. (3) The annual scale drought intensity showed an increasing trend, and the drought intensity value was the highest in the 1990s, and the drought intensity in different seasons showed an increasing trend. Therefore, the risk of regional drought in Henan Province in the future is still high. |
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