摘要
以小于等于0℃最低气温作为霜冻指标,利用1961—2008年阿勒泰地区7个测站逐日最低气温资料,采用现代气候诊断分析方法,分析该区初、终霜日和无霜期的气候变化特征。结果表明:近48 a来阿勒泰大部分地区呈初霜迟、终霜结束早、无霜期延长的趋势,使作物生长季延长,其中哈巴河表现最为显著;极早初霜日发生频数为2—6次,以富蕴最多,极晚终霜日发生频数为1—4次。各站最迟、最早初霜日的差值和最早、最迟终霜日的差值均在30 d以上;哈巴河霜日发生了气候突变。
Frost index was defined by the minimum air temperature less than or equal 0 ℃ in this paper.Based on the daily minimum air temperature data from 7 weather stations in Aletai regions during 1961 to 2008,the characteristics of first/last front day and frost-free season were analyzed by modern climatology diagnosis method.The results indicate that the first frost day delays and the last frost day is ahead,and frost-free season extends in the recent 48 years in Aletai regions.Thus,growth seasons of crops are also prolonged obviously,especially in Habahe region.Frequency of the exceptional first frost day is 2-6-time and the most occurs in Fuyun,while that of the exceptional last frost day is 1-4-time.The differences between the earliest and the latest first frost day or between the earliest and the latest late frost day are more than 30 days.Furthermore,only in Habahe region the frost day has an abrupt change.
出处
《气象与环境学报》
2010年第5期25-29,共5页
Journal of Meteorology and Environment
基金
阿勒泰地区科技项目(2008003)资助
关键词
初终霜日
年代际变化
气候突变
阿勒泰
First/last frost day
Inter-decadal variation
Climate abrupt change
Aletai
