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A Lagrangian Analysis of Water Vapor Sources and Pathways for Precipitation in East China in Different Stages of the East Asian Summer Monsoon

Journal of climate, 2020-02, Vol.33 (3), p.977-992 [Peer Reviewed Journal]

2020 American Meteorological Society ;Copyright American Meteorological Society Feb 2020 ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0894-8755 ;EISSN: 1520-0442 ;DOI: 10.1175/jcli-d-19-0089.1

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  • Title:
    A Lagrangian Analysis of Water Vapor Sources and Pathways for Precipitation in East China in Different Stages of the East Asian Summer Monsoon
  • Author: Shi, Yi ; Jiang, Zhihong ; Liu, Zhengyu ; Li, Laurent
  • Subjects: Air parcels ; Atmospheric precipitations ; East Asian monsoon ; Moisture ; Moisture content ; Monsoons ; Ocean, Atmosphere ; Oceans ; Pathways ; Peninsulas ; Precipitation ; Rain ; Rainfall ; River basins ; Rivers ; Sciences of the Universe ; Seasons ; Summer ; Summer monsoon ; Vapor sources ; Water analysis ; Water content ; Water vapor ; Water vapour ; Wind
  • Is Part Of: Journal of climate, 2020-02, Vol.33 (3), p.977-992
  • Description: The Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) platform is used to simulate Lagrangian trajectories of air parcels in East China during the summer monsoon. The investigation includes four distinct stages of the East Asian summer monsoon (EASM) during its seasonal migration from south to north. Correspondingly, the main water vapor channel migrates from the west Pacific Ocean (PO) for the premonsoon in South China (SC) to the Indian Ocean (IO) for the monsoon in SC and in the Yangtze–Huaihe River basin, and finally back to the PO for the terminal stage of monsoon in North China. Further calculations permit us to determine water vapor source regions and water vapor contribution to precipitation in East China. To a large extent, moisture leading to precipitation does not come from the strongest water vapor pathways. For example, the proportions of trajectories from the IO are larger than 25% all of the time, but moisture contributions to actual precipitation are smaller than 10%. This can be explained by the large amount of water vapor lost in the pathways across moisture-losing areas such as the Indian and Indochina Peninsulas. Local water vapor recycling inside East China (EC) contributes significantly to regional precipitation, with contributions mostly over 30%, although the trajectory proportions from subregions in EC are all under 10%. This contribution rate can even exceed 55% for the terminal stage of the monsoon in North China. Such a result provides important guidance to understand the role of land surface conditions in modulating rainfall in North China.
  • Publisher: Boston: American Meteorological Society
  • Language: English
  • Identifier: ISSN: 0894-8755
    EISSN: 1520-0442
    DOI: 10.1175/jcli-d-19-0089.1
  • Source: Hyper Article en Ligne (HAL) (Open Access)
    Alma/SFX Local Collection
    ProQuest Central

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