2022年夏季长江流域干旱的水循环模拟和分析
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国家重点研发计划项目(2022YFF0801603)


Simulation and analysis of the water cycle in the Yangtze River basin drought in summer 2022
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    摘要:

    基于WRF-WVT水汽追踪模式,对2022年6—8月长江流域极端干旱情况下的水循环进行模拟研究,分析了长江流域蒸散发对长江流域局地和非局地降水的影响。结果表明,2022年夏季干旱导致长江中下游陆地水储量在5—8月期间减少100~150 mm。6—8月长江流域约45%的蒸散发在当地和华北形成降水,其中6月长江流域蒸散发主要贡献当地降水,而7、8月对当地和华北降水的贡献大致相等。6—8月长江流域蒸散发贡献的当地降水逐月减少,总量为8.2×107 m3(长江流域平均91.2 mm),并且降水强度越高当地蒸散发贡献率越小,对当地降水贡献最大的区域为四川盆地附近(最大超过40%)。长江流域蒸散发为华北提供的降水在6—8月先增多后小幅度减少,总量为5.3×107 m3(华北平均58.4 mm),并且降水强度越高长江流域蒸散发贡献率越大。2022年夏季长江流域蒸散发对当地和华北地区暴雨的贡献率都为12%左右。

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    In summer 2022,an extreme drought event occurred in the Yangtze River basin.Based on the WRF-WVT water vapor tracking model,this study simulated the water cycle in the Yangtze River basin under the extreme drought conditions that occurred from June to August 2022,and analyzed the effects of evapotranspiration on local and non-local precipitation in the Yangtze River basin.The results show that the summer drought of 2022 led to a 100—150 mm reduction in land surface water storage in the middle and lower reaches of the Yangtze River from May to August that year.In general,about 45% of the evapotranspiration in the Yangtze River basin in June—August is formed in local and northern China precipitation,and the evapotranspiration from the Yangtze River basin mainly contributes to local precipitation in June,while the contribution to local and northern China precipitation is approximately equal in July and August.The total amount of local precipitation contributed by evapotranspiration in the Yangtze River basin decreases month by month to 8.2×107 m3 (average 91.2 mm throughout the basin),and the contribution of local evapotranspiration decreases with higher precipitation intensity,while the largest contribution to local precipitation occurs near the Sichuan basin(with the maximum exceeding 40%).The contribution of evapotranspiration from the Yangtze River basin to precipitation in North China increases from June to August,then decreases slightly,with a total of 5.3×107 m3 (with an average of 58.4 mm in North China),and the contribution of evapotranspiration from the Yangtze River basin increases with precipitation intensity.In summer 2022,the contribution of evapotranspiration from the Yangtze River basin to heavy rainfall both locally and in North China was about 12%.

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程浩秋,魏江峰,宋媛媛,单昱峰,2023.2022年夏季长江流域干旱的水循环模拟和分析[J].大气科学学报,46(6):813-824. CHENG Haoqiu, WEI Jiangfeng, SONG Yuanyuan, SHAN Yufeng,2023. Simulation and analysis of the water cycle in the Yangtze River basin drought in summer 2022[J]. Trans Atmos Sci,46(6):813-824. DOI:10.13878/j. cnki. dqkxxb.20230323001

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  • 收稿日期:2023-03-23
  • 最后修改日期:2023-05-25
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  • 在线发布日期: 2023-12-26
  • 出版日期: 2023-11-28

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