摘要
利用内蒙古锡林浩特市气象站1953-2006年的逐日气象资料,通过计算降水量的距平百分率,按不同的时间尺度划分不同的干旱等级,对锡林浩特市的干旱情况进行了分析.结果表明,该地区约十年六旱,年干旱程度有加剧趋势;季干旱发生频率约为37%,冬季特旱和重旱出现频率居各季之首,春季次之,除了冬季,其他季节的干旱程度均呈加剧趋势;春-夏和秋-冬连旱频数较其他两季连旱频数高;11月特旱频率居各月之首,3、10、11月重特旱频率达到20%,全年干旱出现最少的月份为6、7月,干旱出现频率为24%,8月份对夏季干旱的加剧有显著的影响.总体上,研究区干旱频发,干旱程度有加剧趋势.
The characteristics of drought in Xilinhot were analyzed by using the observed weather data from 1953 to 2006 of Xilinhot weather station to calculate the precipitation anomaly percentage and to accord different time scales to divided different levels of drought. The results showed that drought occurred in eight years every decade at Xilinhot city; yearly scale drought levels exist an exacerbating trend; the frequency of seasonal droughts is about 37%. Frequency of very severe and severe droughts in winter is the first of the four seasons, spring is second quarter. Except winter, the drought degree in other seasons become serious;the frequency of sustained drought events in the two-season period of spring to summer and autumn to winter are more than in the other two-season periods. The frequency of very severe drought appears in November is the first of 12 months,and that in March, October, November is reached to 20%. June and July have the minimum frequency of drought ,which is 24%. August has a significant impact on the drought in Summer. In sum, droughts is frequently occurred and exist an exacerbating trend in study area.
出处
《内蒙古师范大学学报（自然科学汉文版）》
CAS
2010年第3期269-274,共6页
Journal of Inner Mongolia Normal University(Natural Science Edition)
基金
国家科技支撑计划项目(2006BAC08B0504-01)
关键词
锡林浩特
干旱指数
干旱等级
干旱特征
Xilinhot
drought index
drought levels
drought characteristics
