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The Mid-latitudinal influence on the formation of the monsoon gyre in August 1991

机译:1991年8月在季风景观中形成的中期影响

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摘要

This study investigates the formation of the monsoon gyre (MG) in August 1991. The results suggest the mid-latitudinal processes play an important role in the formation of the MG. The repeating upper-tropospheric Rossby wave breaking events took place in the exit region of midlatitude jet during the period of interest. The wave energy dispersed southeastward and downward from the jet exit region, exciting a low-level subtropical low. Furthermore, the Rossby wave breaking induced salient ageostrophic forcing by disturbing the upper-level PV fields. The Qvector analysis shows that the ageostrophic motion forced by the upper PV streamer favors the early development of the subtropical low. Thereafter, this system moved southwestward, and interacted with the tropical monsoon flows to induce a strong convective band to the southern and southeastern periphery. The enhanced convective heating further strengthened the cyclonic low through the Gill-type response. Furthermore, the asymmetric water vapor transport induced asymmetric convective structure. This pattern suppressed the scale contraction and maintained a large size, leading to the formation of a large-scale monsoon gyre eventually.
机译:本研究调查了1991年8月的季风Gyre(MG)的形成。结果表明中延例过程在MG的形成中起重要作用。在兴趣期间,重复上层对流层罗斯比波打破事件发生在中间射流的出口区。从喷射出口区域向东南和向下分散的波浪能量,激发低水平的亚热带低。此外,Rossby波破坏诱导突出的肺泡迫使上限PV场。 QVector分析表明,上层光伏撞击的肺精动率利用亚热带低的早期发展。此后,该系统向西南移动,并与热带季风流动互动,为南部和东南部和东南部诱发强烈的对流带。增强的对流加热通过鳃型反应进一步加强了旋风低。此外,不对称水蒸气传输诱导的不对称对流结构。这种模式抑制了比例收缩并保持了大尺寸,导致最终形成大规模的季风景观。

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  • 来源
    《Dynamics of Atmospheres and Oceans》 |2019年第6期|52-62|共11页
  • 作者

    Ge Xuyang; Shi Donglei;

  • 作者单位

    Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Forecast & Evaluat Meteoro Key Lab Meteorol Disaster Nanjing 210044 Jiangsu Peoples R China;

    Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Forecast & Evaluat Meteoro Key Lab Meteorol Disaster Nanjing 210044 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Monsoon gyre; Formation; Mid-latitudinal influence;

    机译:季风景观;形成;中纬度影响;

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