1968要2015年临夏州寒潮时空分布特征

摘要

According to the local cold wave standard of Linxia region,the frequency change of cold wave was statistical studied,using daily mean temperature and minimum temperature data of six observation stations from 1968 to 2015.The results showed that there was 212 times of cold wave in Linxia during the past 48 years.Decadal change showed a trend of reduced first and then increased;in April,cold wave occurred more than other months,and reached a total of 104 times,the monthly variation is significantly different;among the seasonal variations,the frequency of cold wave occurrence is most in spring,then in winter,and the least in autumn;sptial distribution of Linxia cold wave is very uneven,and it's closely related with altitude,the highest elevation of Dongxiang occured most frequently,accounted for 44.8%,cold wave frequency of other sites were between 10.4%and 11.8%.%利用甘肃省临夏州6个地面气象观测站1968-2015年逐日平均气温和日最低气温数据资料，根据临夏州地区寒潮标准，统计研究各个气象站历年寒潮频次变化。研究结果表明：在近48年中，临夏州共发生寒潮212次，年代际间呈先减少后增加的趋势；临夏寒潮出现最多的月份是在4月，共104次，月变化差异明显；季节变化为春季最多，秋季次之，冬季最少；临夏州寒潮次数空间分布非常不均且与海拔高度密切相关，州内海拔最高的东乡发生次数最多，占比44.8%，其他站点寒潮频次在10.4%~11.8%之间。