doi:  10.3878/j.issn.1006-9895.1906.18191
高原横切变线与高原低涡关系的初步研究

A Preliminary Study on the Relationship between the Plateau Transverse shear Line and the Plateau Vortex
摘要点击 95  全文点击 22  投稿时间:2018-07-09  修订日期:2019-04-11
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基金:  国家自然科学基金(41675057,41765003,41675042),国家重点研发计划项目 2018YFC1507200
中文关键词:  高原切变线  高原低涡  水汽辐合  非平衡项  生成
英文关键词:  Shear Line  Vortex  Vapor convergence  Unbalanced items  Formation
        
作者中文名作者英文名单位
杜梅Du mei成都信息工程大学
李国平Li Guoping成都信息工程大学
李山山Li shanshan成都信息工程大学
引用:杜梅,李国平,李山山.2020.高原横切变线与高原低涡关系的初步研究[J].大气科学
Citation:Du mei,Li Guoping,Li shanshan.2020.A Preliminary Study on the Relationship between the Plateau Transverse shear Line and the Plateau Vortex[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      摘要:基于大气运动方程组及散度方程,对高原横切变线上扰动稳定性问题以及切变线诱发高原低涡的动力学机制进行了理论分析并用欧洲中心(ECMWF)ERA-interim再分析资料对其进行验证。得出高原横切变线是高原低涡产生的重要背景场,切变线以南的水汽输送与辐合对于低涡的诱发作用是大气处于不平衡状态而引起散度场调整的结果,辐合增强区有利于高原低涡生成,低涡中心对应非平衡正值中心,低涡外围为非平衡项负值区。非平衡项负值大值与水汽辐合带的重叠区对降水落区有较好的指示意义。当高原南部的西南风带向东或东北方向移动或当低涡下游出现非平衡项负值中心时,低涡亦同向移动。若高原出现气旋式环流并且环流中心与非平衡项正值中心对应时,有利于低涡生成;进一步,当低涡中心与非平衡项正值中心对应且正值中心数值不断增大时,低涡趋于发展加强。
Abstract:
      Abstract: Based on the atmospheric motion equations and divergence equation, this paper analyze and discuss the stability of the disturbance involved with the transverse shear line (TSL) over the Tibetan Plateau (TP) and the dynamical mechanism of the Tibetan Plateau vortex (TPV) induced by the TSL then verify it by ERA-interim reanalysis data. It is concluded that the TSL is the important background field of TPV. The TPV induced by the transport of water vapor which located in the south of the TSL is associated with the adjustment of divergence field caused by the unbalanced of atmosphere, which is favorable for the formation of TPV in the position where the convergence is enhanced, the center of the TPV corresponds to the positive center of unbalanced items and the periphery of the TPV is negative area of unbalanced items. The area where the large negative value of unbalanced items coincides with the vapor convergence can indicate the location of precipitation. When the southwest winds increased and move toward the east or northeast, or when there is a negative center area of unbalanced item downstream of the TPV, the vortex moves to the same direction. If there is a cyclonic circulation in the TP and the center of the cyclonic circulation corresponds to the positive center of the unbalanced items, it is conducive to the formation of TPV; further, when the center of the vortex corresponds to the unbalanced positive center and the value of that increase continuously, it is also favorable for the development of the TPV.
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