Relationships between δ ^(18)O in summer precipitation and temperature and moisture trajectories at Muztagata, western China  

作　　者：YU Wusheng1,2, YAO Tandong1,2, TIAN Lide1,2, LI Zhen2, SUN Weizhen2 & WANG Yu2 1. Laboratory of Environment and Process on Tibetan Plateau, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China 2. Key Laboratory of Cryosphere and Environment, Jointly Established by Cold and Arid Regions Environmental and Engi-neering Research Institute and Institute of Tibetan Plateau Research, Chinese Academy of Sciences and Chinese Academy of Meteorological Sciences, China Meteorological Administration, CAS, Lanzhou 730000, China 

出　　处：《Science China Earth Sciences》2006年第1期27-35,共9页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.40121101,40571039);the Chinese Academy of Sciences(Grant No.KZCX3-SW-339);the Ministry of Science and Technology of the People's Republic of China(Grant No.2005CB422004);the National Natural Science Foundation of China(Grant No.40271025).

摘　　要：Based on summer observations of stable isotope of precipitation at Muztagata, western China, during 2002―2003, this paper presents the relationship between δ 18O in precipitation and air temperature, and discusses the effect of moisture transport on δ 18O in precipitation. Results show that air temperature correlates positively with δ 18O in precipitation, and the temperature effect controls the δ 18O of precipitation in this area. The Muztagata region exhibits high δ 18O values in summer precipi-tation, similar to those shown at stations in adjacent regions. According to the results of our model set up to trace the moisture trajectories, the westerlies and local moisture circulation contribute to varia-tions of oxygen isotopes in precipitation. In addition, the impacts of the moisture transport distance, the moisture transport level, and the incursion of the polar air mass also influence the variations of δ 18O in precipitation. The moisture origins and transport mechanisms also contribute to the variation of δ 18O in precipitation at Muztagata.Based on summer observations of stable isotope of precipitation at Muztagata,western China, during 2002—2003, this paper presents the relationship between δ^(18)O inprecipitation and air temperature, and discusses the effect of moisture transport on δ^(18)O inprecipitation. Results show that air temperature correlates positively with δ^(18)O inprecipitation, and the temperature effect controls the δ^(18)O of precipitation in this area. TheMuztagata region exhibits high δ^(18)O values in summer precipitation, similar to those shown atstations in adjacent regions. According to the results of our model set up to trace the moisturetrajectories, the westerlies and local moisture circulation contribute to variations of oxygenisotopes in precipitation. In addition, the impacts of the moisture transport distance, the moisturetransport level, and the incursion of the polar air mass also influence the variations of δ^(18)Oin precipitation. The moisture origins and transport mechanisms also contribute to the variation ofδ^(18)O in precipitation at Muztagata.

关 键 词：Muztagata  δ18O  precipitation  temperature  MOISTURE transport. 

分 类 号：P468.021[天文地球—大气科学及气象学]