论文部分内容阅读
青藏高原季节最大冻土深度变化特征是研究寒区陆面过程的重要方面.利用青藏高原地区35个地面站1961-1998年最大冻土深度的观测资料及5cm土壤温度资料,分析了青藏高原地区土壤季节最大冻结深度时空变化特征.结果显示:青藏高原土壤季节最大冻结深度度呈现明显的变化规律,20世纪60年代至80年代中期土壤季节最大冻结深度相对处于一个增大期,80年代中期至今土壤季节最大冻结深度在减小.冻结期间5cm土壤累积负温距平指标能够较好的描述土壤季节最大冻结深度变化特征,土壤季节最大冻结深度也是高原地区地面热源强度一个较好的表征参数.
The seasonal variation of the maximum frozen soil depth over the Tibetan Plateau is an important aspect to study the land surface processes in the cold regions.Using the observation data of the maximum frozen soil depth from 35 stations in the Qinghai-Tibet Plateau from 1961 to 1998 and the soil temperature data of 5 cm, The results showed that the maximum frozen depth degree of soil in Qinghai-Tibet Plateau showed a clear change rule. The maximum freeze depth of soil season in 1960’s to mid-1980s was in an increasing period. From the mid-1980s to the present The maximum freezing depth of soil season is decreasing.The negative temperature anomaly index of 5cm soil mass during frozen period can well characterize the maximum freezing depth change of soil season, and the maximum freezing depth of soil season is also a good characterization parameter of terrestrial heat source intensity in plateau area.