青藏高原夏季局地陆气相互作用及其对午后对流触发的影响研究综述

A review of studies on local land-atmosphere interactions and their impacts on afternoon convection triggering over the Tibetan Plateau in summer

  • 摘要: 陆地与大气之间的相互作用和反馈非常复杂,需要从多个尺度进行定量、综合和过程层面的理解。局地陆气相互作用是指在弱天气背景下,通过局地尺度上研究陆地表面和大气(即行星边界层)之间的联系,进而理解其对天气气候的影响。因此局地陆气相互作用采用过程链范式,研究比如从干湿土壤到对流触发或者深对流形成之间的联系和链条。青藏高原陆面过程通过调控大尺度环流进而对我国乃至全球气候的影响在过去几十年取得了长足进展,但是局地陆气相互作用对高原午后对流触发影响的研究则相对滞后。本文梳理了针对青藏高原局地陆气相互作用过程及其对午后对流触发影响的观测事实、影响强度及其空间差异和机理,最后总结了当前研究的难点及未来的发展方向。

     

    Abstract: Land-atmosphere interactions and feedback mechanisms are inherently complex, necessitating a quantitative, integrative, and process-oriented understanding across multiple scales. Local land-atmosphere interactions pertain to the examination of the relationship between the land surface and the atmosphere, particularly within the planetary boundary layer (PBL), at a localized scale under weak synoptic background. This is crucial for assessing the implications of these interactions on weather and climate, and it employs a process chain paradigm to investigate various connections such as that between soil moisture and precipitation. While significant advancements have been made in understanding large scale land-atmosphere interactions on the Tibetan Plateau (TP) and their effects over recent decades, research on local land-atmosphere interactions and their impacts on convection initiation over the TP remains comparatively underdeveloped. This paper aims to systematically review observational evidence regarding local land-atmosphere interactions on the Tibetan Plateau (TP), analyze the strengths of the interactions and their spatial variations, explore the underlying causes and mechanisms of such variations, and ultimately reveal current research challenges and propose future directions in this field.

     

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