1960—2018年阿拉善右旗大风气候特征分析

Analysis of windy Climate Characteristics in Alxa Right Banner Area 1960 to 2018

选取阿拉善右旗境内2个国家级气象观测站1960-2018年共59a气象观测资料,分析了阿拉善右旗大风时空分布特征,包括年际和年代际变化、月变化和日变化等。结果表明:阿拉善右旗大风日数具有明显的年际变化特征,总体呈减少趋势;20世纪60-70年代大风日数最多,阿拉善右旗气象站2010-2018年大风日数最少,雅布赖气象站2000-2009年大风日数最少;大风日季节变化明显,4月最多,10月最少,春季最多,秋季最少。一天中03-04时和13-14时,大风出现频率最高。大风风向以ESE为最多,SE次多,两个风向的大风频率占51%。

The 59 a meteorological observation data of two national observation stations in Alxa Right Banner from 1960 to 2018 were selected to analyze the spatial and temporal distribution characteristics of gale in Alxa Right Banner,including interannual and interdecadal variations,monthly variations and diurnal variations.The results show that the number of windy days in Alxa Right Banner has an obvious interannual variation,which is decreasing generally.In the 1960 s and 1970 s,the number of windy days was the highest,and it was the lowest in ayuqi station in 2010 and 2018,and the number of windy days in Yabrai station was the lowest in 2000 and 2009.The seasonal changes of windy days are obvious,it’s the most in April and the least in October,it’s the most in spring and the least in autumn.High winds are most frequent at 3—4 and 13—14 hours of the day.ESE is the largest wind direction,and SE is the most frequent.The frequency of wind from two directions accounts for 51%.