临夏地区霜冻特征分析

Analysis on Characteristics of Frost in Linxia Area

利用临夏州1971—2015年6个气象站霜冻(地面最低温度≤0℃)资料,系统分析了该区域霜冻的时空分布、强度和持续性等气候特征。结果表明:临夏州霜冻天气主要发生在东乡、和政等高海拔地区,全州年、年代霜冻日数总体呈减少趋势,出现的时间主要在4月、5月及9月的中下旬;各种强度的霜冻日数差别很大,随着霜冻强度的增强,霜冻日数逐渐减少,同时霜冻的强度逐年减弱的趋势明显;4月上旬及中旬的前半旬每日临夏全州至少有1个站点出现霜冻的概率达99%以上,而6月至9月中旬每日临夏全州至少有1个站点出现霜冻的概率在5%以内。

Based on frost data（the lowest ground temperature ≤0℃） of six meteorological stations in Linxia from 1971 to 2015 ,the climate feat- ure about space-time,intensity and continuous in Linxia were systematically analyzed.The results showed that frost mainly occurred in the areas of high elevation like Dongxiang and Hezheng.Meanwhile, frost days were decreasing.Frost mainly occurred in April and the middle of May or September.Frost days decreased gradually along with the frost intensity＇s enhancement.For frost intensity,there was a decreasing trend.By analyzing the probability distributions of frost,the result showed that at least one station whose probability was over 99% in the first half of early April and there was also at least one station whose probability bit under 5% between June and the middle of September.