Precipitation samples were collected at Nam Co Comprehensive Observation and Research Station,Tibet Plateau,during August to October of 2005.Relationships between δ18O in precipitation and moisture source are analyzed by using air mass backward trajectories.Difference of moisture source is the primary factor which influences variations of δ18O.While more negative δ18O values occur in precipitation which is caused by moisture originating mainly from Indian Ocean and transported by summer Southwest Monsoon,less negative δ18O values are associated with precipitation by local moistures and westerlies.According to the air mass backward trajectories,precipitation events are divided into two types: continental and marine precipitation.Positive correlations exist between δ18O and air temperature for both types of precipitation events,suggesting secondary affects of temperature on precipitation δ18O.
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