Preprints
https://doi.org/10.5194/hess-2021-269
https://doi.org/10.5194/hess-2021-269

  12 Jul 2021

12 Jul 2021

Review status: this preprint is currently under review for the journal HESS.

Water vapor isotopes indicating rapid shift among multiple moisture sources for the 2018/2019 winter extreme precipitation events in Southeast China

Tao Xu1, Hongxi Pang1,2, Zhaojun Zhan1, Wangbin Zhang1, Huiwen Guo1, Shuangye Wu3, and Shugui Hou1,4 Tao Xu et al.
  • 1Key Laboratory of Coast and Island Development of Ministry of Education, School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
  • 2Collaborative Innovation Center of Climate Change, Jiangsu Province, Nanjing, 210023, China
  • 3Department of Geology, University of Dayton, Dayton, OH 45469, USA
  • 4School of Oceanography, Shanghai Jiao Tong University, Shanghai, 200240, China

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, Southeast China experienced a record-breaking number of extreme precipitation events. In this study, we analyzed the variation of water vapor isotopes and their controlling factors during the extreme precipitation events in Nanjing, Southeast China. The results show that the variations of water vapor isotopes are closely linked to the change of moisture sources. Using a water vapor d-excess weighted trajectory model, we identified five most important moisture source regions: South China, East China Sea, South China Sea, Bay of Bengal, and Continental regions (Northwest China and Mongolia). Moreover, the variations of water vapor d-excess during a precipitation event reflect rapid shifts of 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.

Tao Xu et al.

Status: open (until 06 Sep 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-269', Anonymous Referee #1, 28 Jul 2021 reply
  • RC2: 'Comment on hess-2021-269', Anonymous Referee #2, 28 Jul 2021 reply

Tao Xu et al.

Tao Xu et al.

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Short summary
In this study, we presented stable isotopes in atmospheric water vapor and precipitation for five extreme winter precipitation events in Nanjing, Southeast China, from December 2018 to February 2019. Our results imply that multiple moisture sources and the rapid shift among them are important conditions for sustaining extreme precipitation events, especially in the relatively cold and dry winter.