摘要
利用1962-2007年伊犁河谷气象站冻土资料,分析了46a伊犁河谷季节性冻土变化情况。伊犁河谷冻土开始日期逐渐延后,各站的平均开始日期从10月29日延后到11月19日,推迟了20d。冻土结束日期提前,冻土持续时间缩短21d。平均冻土深度和最大冻土深度均减小,其中最大冻土深度从62.47cm减少到51.93cm。
Variations of seasonal frozen soil in Yili Valley during 1962-2007 were analyzed by the use of the frozen soil observational data of meteorological stations in Yili Valley. The starting date of frozen soil of Yili Valley gradually delayed, the average of several stations delayed 20 days from Oct. 29 until Nov. 19. The end date of frozen soil went ahead, as a result, the average duration of frozen soil reduced about 21 days. Both the average depth and the maximum depth of frozen soil become shallower, the maximum depth of frozen soit reduces from 62.47 cm to 51.93 cm with the reduction rate of 16.9%.
出处
《沙漠与绿洲气象》
2009年第6期34-36,共3页
Desert and Oasis Meteorology
关键词
季节性冻土
最大冻土深度
平均气温
seasonal frozen soil
maximum depth of frozen soil
average temperature
