摘要
根据甘肃河西1958-2003年17个气象站的土壤冻结上、下限记录和最长连续冻结的初、终日资料, 采用小波分析方法研究了甘肃河西季节冻结的年代际变化特征. 结果表明: 甘肃河西最大冻土冻结深度的变化存在8～10 a的周期振荡, 20世纪80年代中期是其变化的转折期, 反映了甘肃河西冬季气候自80年代中期以来变暖的事实. 气候成因分析说明, 气候变暖对河西季节冻结影响显著. 冬季最低气温与甘肃河西季节冻结深度和冻结时间关系密切,特别是冬季地气温差和气温日较差与其关系尤为密切.
Analyzing the upper and lower limits of seasonal frozen ground depth, its main frozen period and ending date from 1958 to 2003 of 17 representative meteorological stations in Hexi Corridor of Gansu Province demonstrates that the change of seasonal maximum frozen ground depth has an 8～10 a period; There was a shift of the frozen ground depth in the mid 1980s, showing a winter temperature warming in Hexi Corridor of Gansu Province since the mid 1980s. The minimum air temperature in winter controls the seasonal frozen ground depth and its main frozen period. The thaw of frozen ground depends on the ground temperature in winter, with a pronounced negative correlation. Especially, the difference among the 5 cm ground temperature and the 1.5 m air temperature above surface, as well as the daily range of temperature in winter is more correlative to the frozen ground depth in Heixi Corridor of Gansu Province.
出处
《冰川冻土》
CSCD
北大核心
2005年第4期503-508,共6页
Journal of Glaciology and Geocryology
基金
国家科技部攻关"西部开发科技行动"重大项目(2004BA901A16)
甘肃自然科技开发基金项目(3ZS041-A25-013)资助
关键词
甘肃河西
季节冻结
热力作用
年代际变化
Hexi Corridor of Gansu Province
seasonal frozen depth
thermal action
interdecadal variation
作者简介
郭慧（1968-），女，陕西兴平人，高级工程师，2004年在兰州大学获硕士学位，主要从事气候及其变化研究工作。E-mail：guoh_lz@sina.com。
