青藏高原冻土区活动层厚度分布模拟  

Simulated Distribution of Active Layer Depths in the Frozen Ground Regions of Tibetan Plateau

作　　者：庞强强[1] 李述训[1] 吴通华[1] 张文纲[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《冰川冻土》2006年第3期390-395,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40471026);国家自然科学基金"西部重大计划"项目(90302006)资助

摘　　要：活动层夏季融化、冬季冻结的近地表土(岩)层,是冻土地区热力动态最活跃的岩层,在冻土研究中有着重要意义.根据青藏高原地区80个气象观测台站1991—2000年的地面温度观测资料结合数字高程模型,计算出青藏高原冻土区的地面冻结指数和地面融化指数,然后应用斯蒂芬公式分别得到多年冻土区的季节融化深度和季节冻土区的季节冻结深度.Active layer is the near-surface layer of frozen soil, which thaws in summer while freezes in winter. In seasonally frozen ground regions as well as permafrost regions, active layer is the most active terrane in terms of thermodynamics. Active layer plays an important role, because almost all ecological, hydrological, pedological and biological activities take place within it. Ground surface freezing index and thawing index are simulated based on the ground surface temperature in the 1990s acquired from 80 meteorological stations on the Tibetan Plateau and nearby regions, together with digital elevation model. Taking the mean annual ground surface temperature isotherm of 0.8 ℃ as the boundary of permafrost and seasonally frozen ground, in consideration of thermal offset, the thawed depth in the permafrost areas and frozen depth in the seasonally frozen ground regions are worked out respectively through Stephen Formula.

关 键 词：青藏高原 冻土 活动层厚度 

分 类 号：P642.14[天文地球—工程地质学]