1960—2010年河南省极端气候事件变化趋势

Change Trend of Extreme Climate Events in Henan Province During 1960-2010

根据1960—2010年河南省18个气象观测站的逐日平均气温、最低气温、最高气温及降水资料,采用国际气候诊断与指数小组所定义的极端气候指标,通过MannKendall检测、线性趋势法等方法对河南省极端气候的变化趋势进行了分析。结果表明:1河南省冷夜、冷日均呈减小趋势,暖夜、暖日均呈增大趋势,年湿期降水总量、重湿日数和简单降水强度指数均呈增大趋势;220世纪80年代后极端降水事件呈明显增加趋势;3大多数站点在20世纪80年代后年最高气温和年最低气温均显著升高。

Based on the daily precipitation, maximum temperature and minimum temperature data of 18 meteorological stations in Henanduring the period of 1960-2010, the extreme precipitation indices were determined for different stations by the ETCDDMI, and then,extreme climate indices were counted and their spatial characteristics and temporary trends were analyzed. The results show that a） theextreme precipitation and temperature indices indicate the remarkable climate regional difference. Annual frequency of cool nights （days） hasdecreased, whereas the frequency of warm nights （days）, consecutive dry days, wet day precipitation and simple daily intensity index havebeen increased; b） the Mann-Kendall （MK） trend test and simple linear regression are utilized to detect the monotonic trends in annualextreme precipitation. It shows that the annual extreme precipitation indices show a potential regime shift starting from the middle of 1980sand ; c） after 1980s, the annual maximum temperature and the annual minimum temperature have been significantly increased in HenanProvince.