Water vapor isotopes indicating rapid shift among multiple moisture sources for the 2018–2019 winter extreme precipitation events in southeastern China
Water vapor isotopes indicating rapid shift among multiple moisture sources for the 2018–2019 winter extreme precipitation events in southeastern China
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DOI：
10.5194/hess-26-117-2022
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发表时间：
2022-01
影响因子：
6.3
通讯作者：
Tao Xu;H. Pang;Zhaojun Zhan;Wangbin Zhang;Huiwen Guo;Shuang‐ye Wu;S. Hou
中科院分区：
文献类型：
--
作者：
Tao Xu;H. Pang;Zhaojun Zhan;Wangbin Zhang;Huiwen Guo;Shuang‐ye Wu;S. Hou
抽象。在东亚季风区，冬季极端降水事件时有发生，并带来巨大的社会和经济损失。从2018年12月到2019年2月，中国东南部经历了创纪录的极端降水事件。本文分析了南京地区极端降水过程中水汽同位素的变化及其控制因素。结果表明，水汽同位素的变化与水汽来源的变化密切相关。利用水汽d-过量加权轨迹模型，我们确定了以下五个最重要的水汽源区：华南，东海，南海，孟加拉湾和大陆区（中国西北部和蒙古）。此外，在降水过程中的水汽d过剩的变化反映了快速移动的水汽源区。这些结果表明，多个水分来源之间的快速变化是维持冬季极端降水事件的重要条件。
Abstract. In the East Asian monsoon region, winter extreme precipitation events occasionally occur and bring great social and economic losses. From December 2018 to February 2019, southeastern China experienced a record-breaking number of extreme precipitation events. In this study, we analyzed the variation in water vapor isotopes and their controlling factors during the extreme precipitation events in Nanjing, southeastern China. The results show that the variations in water vapor isotopes are closely linked to the change in moisture sources. Using a water vapor d-excess-weighted trajectory model, we identified the following five most important moisture source regions: South China, the East China Sea, the South China Sea, the Bay of Bengal, and continental regions (northwestern China and Mongolia). Moreover, the variations in water vapor d excess during a precipitation event reflect rapid shifts in the moisture source regions. These results indicate that rapid shifts among multiple moisture sources are important conditions for sustaining wintertime extreme precipitation events over extended periods.