Characteristics of Stable Isotopes in Precipitation over Northeast China and Its Water Vapor Sources
我国东北地区大气降水稳定同位素特征及其水汽来源

Based on the data of the hydrogen and oxygen stable isotopes in precipitation over Northeast China provided by the Global Network of Isotopes in Precipitation(GNIP) and the meteorological statistics,the spatial and temporal variations of stable isotopes in precipitation and their influencing factors were analyzed and the Local Meteoric Water Line(LMWL) was established.The results were as follows: δ18 O value was low in winter and high in summer;the spatial distribution showed that the weighted δ18 O value decreased from the south to the north;the linear relationship between δ18 O in precipitation and temperature was significant,but no linear relationship was found for the precipitation amount;δ18 O in precipitation can be evaluated quantitatively based on a multiple linear regression equation with δ18 O and related parameters(temperature,precipitation amount,elevation,longitude and latitude).The water vapor source of the sampling sites was tracked by HYSPLIT 4.9 model,and the modeled trajectory of vapor source indicated that there were two main paths,including the cold wet water vapor from the Atlantic Ocean and the Arctic Ocean via Westerlies,and the warm one from the Pacific Ocean.