A method for estimating the contribution of evaporative vapor from Nam Co to local atmospheric vapor based on stable isotopes of water bodies  

作　　者：XU YanWei KANG ShiChang ZHANG YuLan ZHANG YongJun 

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]State Key Laboratory of Cryosphere and Environment, Lanzhou 730000, China

出　　处：《Chinese Science Bulletin》2011年第14期1511-1517,共7页

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-145);the Global Change Research Program of China (2010CB951401);the National Natural Science Foundation of China (40830743)

摘　　要：During the summer monsoon season,the moisture of precipitation events in southern and central regions of the Tibetan Plateau is mainly moisture from the Indian Ocean transported by the Indian monsoon and terrestrial vapor derived from the surface of the Tibetan Plateau.However,the respective contributions of these two types of moisture are not clear.From June to September,the excess deuterium values of precipitation and river water in the Nam Co basin are higher than those for the southern Tibetan Plateau.This reflects the mixing of evaporation from Nam Co and local atmospheric vapor.On the basis of theory for estimating the contribution of evaporative vapor from surface water bodies to atmospheric vapor and relative stable isotopes in water bodies (precipitation,river water,atmospheric moisture and lake water),this study preliminarily estimates that the average contribution of evaporation from the Lake Nam Co to local atmospheric vapor has varied from 28.4% to 31.1% during the summer monsoon season in recent years.During the summer monsoon season, the moisture of precipitation events in southern and central regions of the Tibetan Plateau is mainly moisture from the Indian Ocean transported by the Indian monsoon and terrestrial vapor derived from the surface of the Tibetan Plateau. However, the respective contributions of these two types of moisture are not clear. From June to September, the excess deuterium values of precipitation and river water in the Nam Co basin are higher than those for the southern Tibetan Plateau. This reflects the mixing of evaporation from Nam Co and local atmospheric vapor. On the basis of theory for estimating the contribution of evaporative vapor from surface water bodies to atmospheric vapor and relative stable isotopes in water bodies （precipitation, fiver water, atmospheric moisture and lake water）, this study preliminarily estimates that the average contribution of evaporation from the Lake Nam Co to local atmospheric vapor has varied from 28.4% to 31.1% during the summer monsoon season in recent years.

关 键 词：稳定同位素方法 大气水汽 地表水体 纳木错 蒸发 青藏高原南部 蒸汽 估算 

分 类 号：P597.2[天文地球—地球化学]