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Mesoscale Dynamics and Its Application in Torrential Rainfall Systems in China

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Advances in Atmospheric Sciences 2015年第2期32卷 192-205页

作者： GAO Shouting TAN Zhemin ZHAO Sixiong LUO Zhexian LU Hancheng WANG Donghai CUI Chunguang CUI Xiaopeng SUN Jianhua Laboratory of Cloud-precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of Sciences Department of Atmospheric Sciences Nanjing University Remote Sensing College Nanjing University of Information Science & Technology Meteorological College PLA University of Science and Technology Chinese Academy of Meteorological Sciences Institute of Heavy Rain China Meteorological Administration

Progress over the past decade in understanding moisture-driven dynamics and torrential rain storms in China is reviewed in this paper. First, advances in incorporating moisture effects more realistically into theory are described, including the development of a new parameter, generalized moist potential vorticity（GMPV） and an improved moist ageostrophic Q vector（Qum）. Advances in vorticity dynamics are also described, including the adoption of a ＂parcel dynamic＂ approach to investigate the development of the vertical vorticity of an air parcel; a novel theory of slantwise vorticity development, proposed because vorticity develops easily near steep isentropic surfaces; and the development of the convective vorticity vector（CVV）as an effective new tool. The significant progress in both frontal dynamics and wave dynamics is also summarized, including the geostrophic adjustment of initial unbalanced flow and the dual role of boundary layer friction in frontogenesis, as well as the interaction between topography and fronts, which indicate that topographic perturbations alter both frontogenesis and frontal structure. For atmospheric vortices, mixed wave/vortex dynamics has been extended to explain the propagation of spiral rainbands and the development of dynamical instability in tropical cyclones. Finally, we review wave and basic flow interaction in torrential rainfall, for which it was necessary to extend existing theory from large-scale flows to mesoscale fields, enriching our knowledge of mesoscale atmospheric dynamics.

关键词： mesoscale dynamics torrential rainfall moist atmosphere vorticity dynamics wave-flow interaction

Diagnostic Analysis of wave Action Density During Heavy Rainfall Caused by Landfalling Typhoon

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Journal of Tropical Meteorology 2022年第3期28卷 364-376页

作者： ZHOU Guan-bo JIAO Ya-yin XU Ying-long National Meteorological Center Beijing 100081 China Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province Hainan 570203 China Hebei Meteorological Disaster Prevention and Environmental Meteorology Center Hebei 050033 China

Based on prior investigation,this work defined a new thermodynamic shear advection parameter,which combines the vertical component of convective vorticity vector,horizontal divergence,and vertical gradient of generalized potential *** interaction between waves and fundamental states was computed for the heavyrainfall event generated by landfalling typhoon“Morakot”.The analysis data was produced by ADAS[ARPS(Advanced Regional Prediction System)Data Analysis System]combined with the NCEP/NCAR final analysis data(1°×1°,26 vertical pressure levels and 6-hour interval)with the routine observations of surface and *** it may describe the typical vertical structure of dynamical and thermodynamic fields,the result indicates that the parameter is intimately related to precipitation *** parameter’s positive high-value area closely matches the reported 6-hour accumulated surface *** the statistical analysis reveals a certain correspondence between the thermodynamic shear advection parameter and the observed 6-hour accumulated surface rainfall in the summer of *** implies that the parameter can predict and indicate the rainfall area,as well as the initiation and evolution of precipitation systems.

关键词： disturbance thermodynamic shear advection parameter wave action density generalized potential temperature wave-flow interaction

QBO-like Oscillations Induced by Local Thermal Forcing

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Advances in Atmospheric Sciences 1995年第2期12卷 245-254页

作者：张代洲秦瑜 Hiroshi Tanaka Institute for Hydrospheric-Atmospheric Sciences of Nagoya University Nagoya Japan Department of Geophysics Peking University Beijing

A zonalwetiCal two-dimensional equatorial model is used to study the PO￣ty that the long Period oSCillation of the zonal mean now occurring in the lower equatorial stratosphere(QBO) is cause by local thermal activihes at the tropiCal *** model sumesfully reproduces Q￣like o￣tions of the zonal mean now,suggeshng that the lOCal heating or cooling at the trOPical trOPOpose is Probably the main ￣n of QBO,s generahon. The analysis of the dependence of the oedllahon on the wave foeing iudicatw that the o￣hon is not areaible to the forCing *** model can reproduce QBO--like oscillahons with any forCing￣if the forcing Period and amplitude take appropriate valuex, proving that the inaneal cavity waves ge￣od by lOCal thermal sough take much important roles in QBO.

关键词： Quasi-biennial oscillation(QBO) Local thermal forcing Forced wave wave-flow interaction

Internal　Gravity　waves　Generated　by　a　Local　Thermal　Source　in　an　Irrotational　Zonal－Vertical　Plane：Numerical　Analysis

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Advances in Atmospheric Sciences 1996年第1期13卷 124-132页

作者：张代洲田中浩秦瑜 Center for Environmental Sciences Peking University Beijing Institute for Hydrospheric-Atmospheric Sciences Nagoya Japan Geophysics Department Peking University Beijing

The vertical and horizontal propagation of internal gravity waves forced by a local thermal source at the lowerboundary is examined using the irrotational two-dimensional model developed by Zhang et al. (1995).The sourcegenerates waves with the same absolute frequency 1/15 d-1 but different *** gravity waves withwide spreading frequencies and wavenumbers appear due to wave-wave interactions. The foreced waves iW (westward-propagating with wavenumber 1)and iE (eastward-propagating with wavenumber 1),whose absolute phasespeeds are 31 m s-1,are predominant. Other forced waves with smaller phase speeds are relatively *** interact with the zonal mean flow,causing the flow to alternate with easterly and westerly with a 32-month period. The absolute maximum wind speeds of easterly and westerly are 35 m s-l which is larger than the largest phasespeed of forced waves. The forced waves iE and iW may accelerate easterly and westerly up to i 31 m s',*** excessive accelerations are due to the self--acceleration of waves iE and iW or newly generated highfrequency waves iE and *** horizontal propagation of the waves are mainly affected by the forcing and wave--flow interactions whichlead to fast-slow variations of wave phase speed and amplitude.

关键词： QBO wave-flow interaction wave-wave interaction wave self-acceleration