摘要
大气水汽稳定同位素的变化不仅在长时间尺度上与气候因子相关,而且对于极端天气事件也十分敏感.本文通过分析青藏高原中部那曲地区大气水汽？18 O变化,发现2013年10月15~16日在印度洋台风＂费林＂暴发期间,大气水汽？18 O达极低值42.1‰,平均值低于一般值16.6‰.大气水汽同位素与同期气象观测结果对比分析表明该极低值与水汽来源相关.TRMM卫星日降水量分布及水汽反向追踪模型结果显示,该水汽来源于南部的孟加拉湾.这表明即使在季风结束期,印度洋水汽可以通过极端天气事件影响到青藏高原;这也表明极端天气事件有可能通过稳定同位素信号影响不同介质的稳定同位素记录.
Water vapor isotopes are not only related to climatic factors, but are also very sensitive to extreme synoptic conditions. This paper reports the analysis of the variations of vapor δ18 O at Nagqu on the central Tibetan Plateau during the period of Typhoon Phailin, October 15–16, 2013. We found the vapor δ18 O had an extremely low value of δ42.1‰, or 16.6‰ lower than the average value. We compared the vapor δ18 O with concurrent meteorological data and found the extremely low δ18 O value was linked to the moisture source. The spatial patterns of daily Tropical Rainfall Measuring Mission precipitation and modeled moisture trajectories show that the moisture with extremely low δ18 O originated in the Bay of Bengal. These findings reveal that even after the Indian Monsoon period, moisture from the Indian Ocean can affect the Tibetan Plateau through extreme synoptic events. Moreover, there is a hint that the stable isotopes during extreme synoptic events might be recorded in different archives.
出处
《科学通报》
EI
CAS
CSCD
北大核心
2014年第35期3526-3532,共7页
Chinese Science Bulletin
基金
国家自然科学基金(41025002,41371086,91437110)
中国科学院战略性先导科技专项(B类)(XDB03030100)资助
