Abstract
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 in precipitation and air temperature, and discusses the effect of moisture transport on δ 18 O in precipitation. Results show that air temperature correlates positively with δ 18 O in precipitation, and the temperature effect controls the δ 18 O of precipitation in this area. The Muztagata region exhibits high δ 18 O 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 18 O in precipitation. The moisture origins and transport mechanisms also contribute to the variation of δ 18 O in precipitation at Muztagata.
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