Abstract
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 δ 18 O变化, 发现2013年10月15~ 16日在印度洋台风“费林”爆发期间, 大气水汽 δ 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.
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