Diurnal freeze/thaw cycles of the ground surface on the Tibetan Plateau  

作　　者：YANG MeiXue YAO TanDong GOU XiaoHua HIROSE Nozomu FUJII Hide Yuki HAO LiSheng D. F. LEVIA 

机构地区：[1]Key Laboratory of Cryosphere and Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [2]Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China [3]Key Laboratory of Western China's Environment System MOE, Lanzhou University, Lanzhou 730000, China [4]University of Tokyo, Tokyo, Japan [5]Hengshui Meteorological Bureau, Hengshui 053000, China [6]Center for Climatic Research and Department of Geography, University of Delaware, DE 19716, USA

出　　处：《Chinese Science Bulletin》2007年第1期136-139,共4页

基　　金：Supported by the National Key Basic Research Program (Grant No. 2005CB422004);the National Natural Science Foundation of China (Grant No. 40571036);the Cen-tury Program of CAS (Grant No. 2004401);the Talent Program of CAREERI, CAS

摘　　要：The exchange of energy and water between the lithosphere and atmosphere mainly takes place at the ground surface. Therefore, freeze/thaw condition at the ground surface is an important factor in ex- amining the interactions between the land surface and atmosphere. Based on the observation data obtained by CEOP/CAMP-Tibet, the diurnal freeze/thaw cycles of the ground surface near Naqu, central Tibetan Plateau was preliminarily analyzed. The results show that the surface layer was completely frozen for approximately one month. However, the time that the ground surface experienced diurnal freeze/thaw cycles was about 6 months. The high frequency of freeze/thaw cycles at the ground surface significantly influences water and energy exchanges between ground and atmosphere over half a year. The interaction processes between the ground and atmosphere under different soil conditions (such as complete thaw, complete freeze and diurnal freeze/thaw cycles) are issues worthy of further examina- tion.The exchange of energy and water between the lithosphere and atmosphere mainly takes place at the ground surface. Therefore, freeze/thaw condition at the ground surface is an important factor in examining the interactions between the land surface and atmosphere. Based on the observation data obtained by CEOPICAMP-Tibet, the diurnal freeze/thaw cycles of the ground surface near Naqu, central Tibetan Plateau was preliminarily analyzed. The results show that the surface layer was completely frozen for approximately one month. However, the time that the ground surface experienced diurnal freeze/thaw cycles was about 6 months. The high frequency of freeze/thaw cycles at the ground surface significantly Influences water and energy exchanges between ground and atmosphere over half a year. The Interaction processes between the ground and atmosphere under different soil conditions （such as complete thaw, complete freeze and diurnal freeze/thaw cycles） are issues worthy of further examination.

关 键 词：西藏 高原 地貌 冻结层 解冻层 

分 类 号：P5[天文地球—地质学]