长治市气候与冻土的变化特征分析

摘要

Using data from 11 meteo-rological stations in Changzhi City in re-cent 40 years (1971—2010), such as mean temperature, mean depth of frozen soil, maximum depth of frozen soil, and shallow soil thawing (5-20 cm), and ap-plying statistical comparison and cluster method, climatic warming and frozen soil changes in the city were analyzed. The results showed that Changzhi City wit-nessed obvious climatic warming in the past decades, the annual linear tempera-ture increase rate is 0.30℃/10 a. With the warming winter, mean depth of frozen soil and maximum depth of frozen soil have reduced. With the warming transitional period between winter and spring, autumn and winter, mean final and first frozen date of the shallow soil layer came in advance and delayed re-spectively, i.e., frozen period of shallow soil shortened.%应用长治市11个气象观测站近40年（1971—2010年）气温、平均冻土深度、最大冻土深度、浅层（5~20 cm）冻土封解冻资料，采用统计对比聚类法分析气候变暖与冻土的气候变化特征。结果表明，长治气候变暖较为明显，年际线性趋势增温率为0.30℃/10 a。随着冬季气候的变暖，平均冻土深度与最大冻土深度均趋向变浅。在冬春、秋冬2个转换期气候变暖的前提下，浅层冻土的平均冻结终日与始日分别显现出提前和推后，意味着浅层土壤封冻期的缩短。