Discussion on Water Vapor Source Based on Hysplit Model and Characteristics of the Isotopes in Precipitation in Yinchuan
Base on Hysplit model with Backwards Trajectory showed Yinchuan was dominated by westerly continental vapor throughout the year, and also was influenced by the maritime vapor in spring and summer. Owing to the high temperature, Yinchuan was remarkably effected by local evaporation of water vapor in spring and summer. By dint of isotopes data of the meteoric precipitation in Global Network of Isotopes of Yinchuan station, the changes characteristics of precipitation in Yinchuan were analyzed. The analysis of the relationship between δ 18O with precipitation and respectively implied that the weighted average of δ 18O took on a good temperature effect. At the same time, it showed a positive correlation between the weighted average of δ 18O and precipitation, which was related to the arid and semi-arid climate of Yinchuan. The slope and intercept of local meteorological water line (LMWL) of Yinchuan were lower than that of Global Meteorological Water Line ( GMWL) and Chinese precipitation line.