Impacts of moisture transport on extreme precipitation in the Central Plains Urban Agglomeration, China

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Global and Planetary Change Pub Date : 2024-09-12 DOI:10.1016/j.gloplacha.2024.104582
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Abstract

In recent decades, the Central Plains Urban Agglomeration of China (CPUA) has faced recurring extreme precipitation events (EPEs), leading to severe floods, endangering residents, and causing significant property damage. This study examines the spatiotemporal patterns of summer EPEs in the CPUA from 1961 to 2022. We used the Hybrid Single-Particle Lagrangian Integrated Trajectory model to trace the water vapor trajectories associated with these events, identifying atmospheric circulations linked to various moisture sources. Summer EPEs in the CPUA have become more frequent and intense. Urban regions typically experience stronger EPEs, while mountainous regions encounter more frequent but milder precipitation. The moisture contributing to these events comes from sources including Eurasia (9.94 %), the northern and southern Western North Pacific (48.39 %), and the Bay of Bengal and South China Sea (41.67 %). Notably, contributions from Eurasia and the northern Western North Pacific have increased, whereas those from the Bay of Bengal and the South China Sea have decreased. Events driven by Western North Pacific moisture have stronger impacts on urban areas, influenced by abnormal anticyclonic patterns and the development of the Huang-Huai cyclone, which triggers intense convective activity over the CPUA. The strengthening of the Western North Pacific subtropical high promotes the transport of warm air, which merges with colder inland air, leading to extreme precipitation.

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中国中原城市群水汽输送对极端降水的影响
近几十年来,中国中原城市群(CPUA)经常面临极端降水事件(EPEs),导致严重洪涝灾害,危及居民生命安全,造成重大财产损失。本研究探讨了 1961 年至 2022 年中央苏区夏季极端降水事件的时空格局。我们利用混合单粒子拉格朗日综合轨迹模式追踪了与这些事件相关的水汽轨迹,确定了与各种水汽源相关的大气环流。中央气象台的夏季 EPE 越来越频繁,强度也越来越大。城市地区通常会出现较强的 EPE,而山区则会出现更频繁但更温和的降水。造成这些事件的水汽来源包括欧亚大陆(9.94%)、北太平洋西部北部和南部(48.39%)以及孟加拉湾和中国南海(41.67%)。值得注意的是,欧亚大陆和北太平洋西部北部的降水量有所增加,而孟加拉湾和中国南海的降水量则有所减少。受异常反气旋模式和黄淮气旋发展的影响,由北太平洋西部水汽驱动的事件对城市地区的影响更大,黄淮气旋会引发中央气象台上空的强对流活动。北太平洋副热带高压的加强促进了暖空气的输送,暖空气与内陆冷空气汇合,导致极端降水。
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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