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INVESTIGATION ON GEOSTROPHIC ADJUSTMENT,frontogenesis AND OSCILLATIONS

Acta meteorologica Sinica 2001年第3期15卷 346-355页

作者： PAN Yinong(潘益农) WU Rongsheng(伍荣生) The Key Laboratory of Mesosacle Severe Weather Department of Atmospheric SciencesNanjing University Nanjing 210093 The Key Laboratory of Mesosacle Severe Weather Department of Atmospheric SciencesNanjing University Nanjing 210093

Geostrophic adjustment and frontogenesis are examined by means of the 2-D ARPS model. The simulation shows *** the large-scale forcing,both the frontogenesis and frontolysis are observed during the geostrophic adjustment process and the intensity of the front oscillates in the case of no *** convergence (divergence) induced by the secondary circulation is the most important factor for frontogenesis (frontolysis) at the top and bottom *** amplitude and period of oscillation are dependent on the initial atmospheric stratification and the Coriolis frequency,and they are related to the inertio-gravity wave.

关键词： geostrophic adjustment frontogenesis and frontolysis inertio-gravity oscillation

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Structural Characteristics of the Spring Transverse Shear Line over the Qinghai-Tibet Plateau and the Influence Mechanism of the Upper-level Jet on Its Evolution

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Meteorological and Environmental Research 2022年第2期13卷 28-37,40页

作者： Qin GUAN Xiaoyan SHEN Qingping LI Qinghai Provincial Meteorological Observatory Xining 810001China Qinghai Institute of Meteorological Science Xining 810001China Huangnanzhou Meteorological Office of Qinghai Province Tongren 811300China

Based on the four-times-daily ERA-Interim data with the resolution of 0.75°×0.75°,the structure and evolution characteristics of a transverse shear line(TSL)over the Qinghai-Tibet Plateau in April 2017 were analyzed,and the influence mechanism of the frontogenesis and frontolysis caused by the upper-level jet on its evolution was also *** results show that the TSL was mainly located near the axis of the positive vorticity zone,which was a low-value area of the wind *** was a shallow baroclinic system with weak ascending *** the vertical direction,the TSL extended to the lowest height at 00:00 and the highest at 18:*** the horizontal direction,the length of the TSL in the east-west direction was relatively shorter during 00:00-06:00 and relatively longer during 12:00-18:***,the position of the TSL was slightly northward at 06:00 and slightly southward at 18:*** moving direction of the TSL was generally consistent with that of the upper-level *** addition,the vertical stretching height of the TSL and the near-surface wind speed were positively correlated with the intensity of the upper-level *** calculation by frontogenesis function indicates that the frontogenesis(frontolysis)was conducive to the formation(weakening)and strengthening(dissipation)of the *** horizontal deformation-induced and diabatic heating-induced frontogenesis were favorable for the formation of the TSL,while the middle-level horizontal convergence-induced and diabatic heating-induced frontogenesis were beneficial to its ***,the moving direction and baroclinicity of the TSL over the Qinghai-Tibet Plateau were determined by the horizontal deformation-induced *** the frontogenesis function,the terms of horizontal deformation and horizontal convergence together determined the position of the TSL,and the diabatic heating term was conducive to the upward extension of the TSL.

关键词： Plateau transverse shear line Structure Evolution frontogenesis and frontolysis

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