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### 基于SPEI指数的近53年河南省干旱时空变化特征

1. 1. 商丘师范学院环境与规划学院,商丘 476000
2. 商丘师范学院生命科学学院,商丘 476000
• 收稿日期:2014-12-19 修回日期:2015-04-24 出版日期:2015-08-25 发布日期:2015-08-20
• 作者简介:

作者简介：史本林（1967- ）,男,河南柘城人,教授,主要从事区域环境变化方面研究。E-mail: shibenlin@163.com

• 基金资助:
国家自然科学基金（41140019）;教育部人文社会科学研究青年基金项目（13YJCZH283）;河南省高校重点科研项目（15A180054,15A170011）

### Spatial and temporal variations of drought in Henan province over a 53-year period based on standardized precipitation evapotranspiration index

Benlin SHI1(), Xinyu ZHU1(), Yunchuan HU2, Yanyan YANG1

1. 1. College of Environment and Planning, Shangqiu Normal University, Shangqiu 476000, Henan, China
2. College of Life Sciences, Shangqiu Normal University, Shangqiu 476000, Henan, China
• Received:2014-12-19 Revised:2015-04-24 Online:2015-08-25 Published:2015-08-20

Abstract:

Drought, one of the most complex natural hazards, affects agriculture, water resources, natural ecosystems, and society. The negative societal consequences of drought include severe economic losses, famine, epidemics, and land degradation. However, there are few studies on the complexity of drought characteristics, both at multiple time scales and with variations in evapotranspiration. In this study, drought occurrences were quantified using a new drought index, the standardized precipitation evapotranspiration index (SPEI), based on observed meteorological data of monthly mean temperature and precipitation from 1961 to 2013 in Henan province, central China. This can help decision-makers improve their level of preparedness and adopt appropriate policies for agricultural management. Based on the SPEI values of each weather station in the study, the frequency and severity of meteorological droughts were computed, and the monthly, seasonal, and annual drought frequency and intensity over a 53-year period were analyzed. The spatial and temporal evolution, intensity, and the primary causes of drought occurrence in Henan were revealed. The results showed that the SPEI values effectively reflected the spatial and temporal pattern of drought occurrence. As the time scale decreased, the amplitude of the SPEI increased and droughts became more frequent. Since 1961, drought has occurred at the annual, seasonal, and monthly scales, and the occurrence of drought has increased. However, regional distribution has been uneven. The highest drought frequency, 35%, was observed in the Zhoukou region, while the lowest value, 26%, was measured in the central and western parts of Henan. The most severe seasonal droughts occurred in the spring and summer months, followed by autumn. Annually, wide-ranging droughts occurred in 1966-1968, 1998-2000, and 2011-2013. The drought intensity distribution showed higher values in northern and western Henan, and lower values in its east and south. The maximum drought intensity value was recorded in Anyang, and the minimum occurred in Zhumadian, at 22.18% and 16.60%, respectively. The factors with the greatest influence on drought occurrence are increasing temperatures, the Eurasian atmospheric circulation patterns, and the El Niño effect.