论文部分内容阅读
根据1998年夏季中日GAME/Tibet项目在青藏高原中部进行的降水中稳定同位素研究结果以及相关的气象观测资料,分析了青藏高原中部夏季降水中δ18O的变化规律。研究结果发现,青藏高原中部夏季降水中δ18O的波动与大规模天气活动有关,而不是地方性的气象条件。该地区降水中δ18O对水汽来源的变化以及水汽的输送过程十分敏感。夏季伴随西南季风进入高原南部的水汽形成的降水中δ18O较低,而且季风活动越强,降水中δ18O也越低。从青藏高原北部而来的水汽或地方蒸发水汽形成的降水,其δ18O值较高。
Based on the results of the stable isotope precipitation in the central Tibetan Plateau during the GAME / Tibet project in summer 1998 and the related meteorological data, the variation of δ18O in the summer precipitation in the central Tibetan Plateau was analyzed. The results show that the δ18O fluctuations in the summer precipitation in the central Tibetan Plateau are related to large-scale weather activities, not to the local meteorological conditions. Δ18O in precipitation in this area is very sensitive to the source of water vapor and the transport of water vapor. In summer, δ18O is lower in precipitation accompanied by the southwest monsoon entering the southern plateau, and the stronger the monsoon activity is, the lower δ18O in precipitation is. Δ18O values are higher for precipitation from water vapor or evapotranspiration from the northern part of the Tibetan Plateau.