The altitude effect of ^(18)δO in precipitation and river water in the Southern Himalayas  

作　　者：WEN Rong TIAN LiDe WENG YongBiao LIU ZhongFang ZHAO ZhongPing 

机构地区：[1]Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [3]State Key Laboratory of Cryosphere Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [4]Tianjin Key Laboratory of Water Environment and Water Resource, Tianjin Normal University, Tianjin 300387, China

出　　处：《Chinese Science Bulletin》2012年第14期1693-1698,共6页

基　　金：supported by the National Basic Research Program of China (2010CB951702);the National Natural Science Foundation of China (41025002);the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-Q09-03 and KZCX2-YW-GJ05)

摘　　要：The lapse rate of water isotopes is used in the study of the hydrologic cycle as well as in the estimation of uplift of the Tibetan Plateau.The greater elevation contrast in the Southern Himalayas allows for a detailed discussion about this lapse rate.We analyze variations of 18δO in precipitation and river water between 1320 m and 6700 m elevations in the Southern Himalayas,and calculate the specific lapse rate of water 18δO.The results show that the multi-year average lapse rate in precipitation over this region is 0.15‰/100 m.The one-year average lapse rate is 0.17‰/100 m from three sites along the Southern Himalayas.The two results agree,but are much lower than the global average of 0.28‰/100 m.This work also shows that there is a difference in precipitation 18δO lapse rate between the monsoon and non-monsoon seasons.The calculated precipitation lapse rate is much lower than that in surface water.The lapse rate of water isotopes is used in the study of the hydrologic cycle as well as in the estimation of uplift of the Tibetan Plateau. The greater elevation contrast in the Southern Himalayas allows for a detailed discussion about this lapse rate. We analyze variations of δ18O in precipitation and river water between 1320 m and 6700 m elevations in the Southern Himalayas, and calculate the specific lapse rate of water δ18O. The results show that the multi-year average lapse rate in precipitation over this region is 0.15‰100 m. The one-year average lapse rate is 0.17‰100 m from three sites along the Southern Himalayas. The two results agree, but are much lower than the global average of 0.28‰100 m. This work also shows that there is a difference in pre- cipitation δ18O lapse rate between the monsoon and non-monsoon seasons. The calculated precipitation lapse rate is much lower than that in surface water.

关 键 词：喜马拉雅山脉 降水率 河水 高程效应 青藏高原隆升 递减率 水文循环 同位素 

分 类 号：P542.1[天文地球—构造地质学] TV212[天文地球—地质学]