内蒙古地区夏季高温事件的大气环流异常特征分析

The Atmospheric Circulation Anomaly Characteristics of Summer High Temperature Events in Inner Mongolia

利用1961—2019年内蒙古107个国家气象站逐日最高气温观测资料,分析了内蒙古地区夏季高温事件的时空变化特征和分区域特征,初步分析了夏季高温事件与大气环流异常的可能联系。结果表明:内蒙古地区高温事件频次从1997年开始大幅度增加,1999—2001年连续3年高温事件异常偏多;内蒙古区域高温事件异常偏多的年份有较大不同,中西部地区线性变化趋势最显著;中西部和东北部地区在2001—2010年高温事件最多,东南部地区在2011年之后最多,东北部地区高温事件出现时间较晚;高温事件异常偏多年和异常偏少年与500 hPa高度场和海平面气压场的环流异常有关。

Based on the daily maximum temperature observation data of 107 national meteorological stations in Inner Mongolia during the period of 1961—2019,the spatio-temporal variation and regional characteristics of summer high temperature events in Inner Mongolia were analyzed.Moreover,the possible relationship between summer high temperature events and atmospheric circulation anomalies was preliminarily analyzed.The results showed that the frequency of high temperature events in Inner Mongolia increased greatly from 1997,and the high temperature events were abnormally more for three consecutive years during 1999—2001.The variation of regional high temperature events in Inner Mongolia were significantly,especially in the Midwest regions,the trend of change was remarkable.The Midwest and Northeast regions had the highest number of high temperature events during 2001—2010,but the Southeast had the most since 2011.The high temperature event appeared later in Northeast.The abnormal high temperature events in Inner Mongolia were related to the abnormal circulation of 500 hPa height field and sea level pressure field.