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Comparative Analysis of the Generalized Omega Equation and Generalized Vertical Motion Equation

Advances in Atmospheric Sciences 2023年第5期40卷 856-873页

作者： Baofeng JIAO Lingkun RAN Na LI Ren CAI Tao qU Yushu ZHOU Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Urumqi City Bureau of Meteorology Urumqi 830002China

Research on vertical motion in mesoscale systems is an extraordinarily challenging effort.Allowing for fewer assumptions,a new form of generalized vertical motion equation and a generalized Omega equation are derived in the Cartesian coordinate system(nonhydrostatic equilibrium)and the isobaric coordinate system(hydrostatic equilibrium),respectively.The terms on the right-hand side of the equations,which comprise the q vector,are composed of three factors:dynamic,thermodynamic,and mass.A heavy rain event that occurred from 18 to 19 July 2021 in southern Xinjiang was selected to analyze the characteristics of the diagnostic variable in the generalized vertical motion equation(qz)and the diagnostic variable in the generalized Omega equation(qp)using high-resolution model data.The results show that the horizontal distribution of the qz-vector divergence at 5.5 km is roughly similar to the distribution of the qp-vector divergence at 500 hPa,and that both relate well to the composite radar reflectivity,vertical motion,and hourly accumulated precipitation.The qz-vector divergence is more effective in indicating weak precipitation.In vertical cross sections,regions with alternating positive and negative large values that match the precipitation are mainly concentrated in the middle levels for both forms of q vectors.The temporal evolutions of vertically integrated qz-vector divergence and qp-vector divergence are generally similar.Both perform better than the classical quasigeostrophic q vector and nongeostrophic q vector in indicating the development of the precipitation system.

关键词： generalized Omega equation generalized vertical motion equation q vector heavy rain

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A　Diagnostic　Study　of　Explosive　Development　of　Extratropical　Cyclone　over　East　Asia　and　West　Pacific　Ocean

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Advances in Atmospheric Sciences 1994年第3期11卷 251-270页

作者：贾逸勤赵思雄 Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

In this paper, a diagnostic analysis is made for a kind of explosive cyclone ovcr East Asia and the West PacificOcean in cold season, using the level Ⅲ FGGE dataset. The cyclone started developing at 0000 UTC 30 March, 1979.q vector analysis shows that ageostrophic wind was obvious in cyclone region. The calculation of different kindsof frontogenetical functions indicates that the development of cyclone was closely related to baroclinicity, especially,at lower levels.Isentropic analysis revealed the three-dimensional structure of cyclone development, that is, ascent of southerlywarmer current and descent of northerly colder current existed around the cyclonic center during the developing process of the cyclone and is very favourable to the release of available potential energy and generation of eddy kineticenergy.Not only shear component, but also curvature component of upper level jet contributed to the explosive development of the cyclone.The computation of convergence of moisture flux demonstrated that the moisture probably came from the tropical ocean. The distribution of water vapor supply in this case was very advantageous to the deepening of cyclone, especially, during the well-developing period.Comparison between East Asia Pacific case and North America-Atlantic case (Ogura and Juang, 1990) hasbeen conducted. The common characteristics were that there existed strong baroclinicity in both cases. However, inthe latter case, the latent heat release was of secondary importance and in our case, moisture also played very important role in certain. stages of the cyclogenesis, especially, during well-developing stage when it moved over oceanicsurface.

关键词： Explosive cyclone Extratropical disturbance Frontogenesis Isentropi analysis q vector

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Diagnosis of a Severe Rainstorm Event Induced by Eastly Wave and Vortex in Off Southeast Coast of China

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高原气象 2009年第5期28卷 1058-1066页

作者： ZHENG Feng1-3(1.Chinese Academy of Meteorological Sciences,Beijing 100081,China 2.Nanjing University of Information Science & Technology,Nanjing 210044,China 3.Wenzhou Meteorological Bureau,Wenzhou 325027,China) Chinese Academy of Meteorological Sciences 北京 100081

Using the NCEP reanalysis at 1°×1° resolution in conjunction with satellite imagery,a study is undertaken of easterly wave related rainstorm events on August 3~4,2001 in seaboards between northern Fujian and southern Zhejiang,expounding the scheme for computing helicity,and exploring the rainstorm evolution and the genesis of the Yandang mountains-triggered a meso-vortex(Duan and Chen,2005) by means of helicity and q vector divergence.Besides,MM5V2 is employed to simulate the easterly wave caused meso-vorte...

关键词： Easterly wave Meso-vortex Helicity q vector MM5 modeling

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