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Temporal variations of δ^(18)O of atmospheric water vapor at Delingha

science china Earth sciences 2008年第7期51卷 966-975页

作者： yin changliang1, yao tandong2, tian lide2, liu dongnian3, yu wusheng2 & qu dongmei2 1 state key laboratory of cryoshperic science, cold and arid regions environmental and engineering research institute, chinese academy of sciences, lanzhou 730000, china 2 laboratory of Environment and Processes, institute of Tibetan Plateau research, chinese academy of sciences, Beijing 100085, china 3 Meteorological Observatory of Haixi Prefecture of Qinghai Province, Delingha 817000, china state key laboratory of cryoshperic science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China laboratory of Environment and Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China Meteorological Observatory of Haixi Prefecture of Qinghai Province Delingha China

Oxygen stable isotope of atmospheric water vapor is widely used to study the modern process of cli- mate. Atmospheric water vapor samples were collected at Dlingha, northeast of Tibetan Plateau during the period from July 2005 to February 2006. The variation of δ18O and the relationships between δ18O and both the temperature and specific humidity are analyzed in this paper. Results show that the sea- sonal variation of δ18O of atmospheric water vapor at Delingha is remarkable with higher δ18O in summer and lower δ18O in winter. The temporal variation of vapor δ18O shows obvious fluctuations, with magnitude of over 37‰. The daily variation of the δ18O is highly correlated with air temperature. The relationship between δ18O and atmospheric water vapor content is complex. Study shows that δ18O of atmospheric water vapor is positively correlated with specific humidity in winter in seasonal scale and inversely correlated with specific humidity in summer rainy period. The δ18O values of at- mospheric water vapor are lower than those of precipitation at Delingha, and the average difference is 10.7‰. Variations of δ18O of atmospheric water vapor is also found to be affected by precipitation events, The model results show that the precipitation effect could have caused the vapor δ18O in the raining season to lower by 7% in average in July and August.

关键词： Delingha δ18O atmospheric water vapor

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