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A SEMI-CIRCLE THEOREM FOR UNSTABLE PERTURBATION IN TROPICAL CYCLONE-SCALE VORTICLES

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Journal of Hydrodynamics 2009年第4期21卷 473-481页

作者： HUANG Hong ZHANG Ming XU Ming institute of Meteorology PLA University of Science and Technology Nanjing 211101 China shanghai typhoon institute China Meteorological Administration Shanghai 200030 China Laboratory of typhoon Forecast Technique/CMA Shanghai 200030 China

In this paper, we discusses the spectrum distribution of baroclinic disturbances in tropical cyclone-scale vortices with the assumption that the basic flow does not vary with height. The semi-circle theorem for the unstable perturbation is obtained and the upper bound of growth rate can be estimated. The upper bound of instability growth rate increases with the increase of the maximum basic-state tangential wind speed, angular speed, inertial parameter, absolute vorticity, radial gradient of absolute vorticity and static stability. The upper bound of instability growth rate is greater for vortices of larger horizontal scale and smaller vertical scale and lower wave-number disturbances.

关键词： tropical cyclone-scale vortex spiral bands instability semi-circle theorem

Quantitative analysis of torrential rainfall associated with typhoon landfall:A case study of typhoon Haitang(2005)

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Progress in Natural Science:Materials International 2009年第1期19卷 55-63页

作者： Caijun Yue a,b,a shanghai typhoon institute,the china Meterological Administration shanghai 2.0030,china b Laboratory of typhoon Forecast Technique/china Meterological Administration,Shangai 2.0030,china [a]shanghai typhoon institute the china Meterological Administration Shanghai 200030 China [b]Laboratory of Typhoon Forecast Technique/China Meterological Administration Shangai 200030 China

A quantitative analysis of torrential rainfall associated with typhoon Haitang(2005) is carried out using a modified moist ageostrophic Q vector and data from Weather Research and Forecasting(WRF) model *** major factors determining the ascending motion associated with torrential rainfall have been studied:large-scale and convective condensational heating,topographic lifting and *** results show that the convective condensational heating plays a major role in the torrential rainfall process,and the large-scale condensational heating is secondary before the landfall of typhoon Haitang,and vice versa after the *** topographic lifting affects the formation of rainfall,whereas the topographic friction has important impacts on torrential rainfall after the *** rainfall amounts forced by the topographic friction and lifting have similar horizontal distributions,but the magnitudes of the former are 2-3 times larger than those of the *** rainfall amounts forced by topography(lifting and friction) and modified moist ageostrophic Q vector have different horizontal distributions,and the magnitudes of the former are 2-5 times larger than those of the *** analysis shows that the typhoon rainfall may be motivated by modified moist ageostrophic Q vector and enhanced further by the topographic effects.

关键词： Torrential rainfall typhoon landfall Modi?ed moist ageostrophic Q vector Topography Condensational heating Quantitative analysis

The computation of maximum wind speeds of typhoon

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Acta Oceanologica Sinica 1990年第1期9卷 69-79页

作者： Chen Kongmo and Qin Zenghao Third institute of Oceanography, State Oceanic Administration, Xiamen, china shanghai typhoon institute, shanghai, china

-At present, it is still difficult to obtain an accurate maximum wind speed of typhoon with modern means,such as satellite survey , radar tracing and airplane reconnaissance. The performance of statistical equation established with observational maximum wind speed and the central pressure of typhoon is unstable ,and it is unreliable in operational use. Therefore a general pressure field model of typhoon is introduced in this paper based on atmospheric motion equations and formulas are derived for computing the maximum wind speed around typhoon center over sea surface . The theoretical curves derived from these formulas are in good agreement with those using the statistic empirical curves of typhoon pressure-wind relations over the western Pacific. Tests were conducted for typhoons which occurred in 1973 and in 1983 and the strongest typhoons selected each year during 1970 and 1978,the results were satisfactory. Meanwhile the analyses of computing results showed that the effect of Coriolis force could be negligible and the eccentric-elliptical pressure structure of typhoon could be treated as circular symmetric.

关键词： over

Dynamics of air-sea planetary boundary layer under the geostrophic momentum approximation condition

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Acta Oceanologica Sinica 1988年第2期7卷 203-213页

作者： Wang Chunzai and Qin Zenghao Shandong College of Oceanography, Qingdao, china shanghai typhoon institute, shanghai, china Shandong College of Oceanography Qinqdao China China

In this paper, the air-sea planetary boundary is divided into three layers. With the aid of geostrophic momentum approximation, wind and current profiles, surface wind, surface wind stress and Ekman pumpinii in the atmosphere as well as in the ocean affected by the atmospheric baroclini-city, stratification and nonlinear effects are investigated systematically for an ocean of infinite depth. Meanwhile, the characteristics of the air-sea interaction is analyzed.

关键词： planetary ocean momentum Ekman stratification systematically viscosity currents infinite trough

Nolinear waves and their barotropic stability in the tropical ocean and atmosphere

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Acta Oceanologica Sinica 1990年第3期9卷 363-371页

作者： Liu Qinyu and Qin Zenghao Ocean University of Qingdao, Qingdao, china shanghai typhoon institute, shanghai, china

In this paper, the nonlinear waves and their barotropic stability in the tropical ocean and atmosphere are studied with the qualitative theory of the ordinary differential equation. The relationship is derived between the stability of nonlinear waves with different frequencies and the basic currents and their horizontal shear in the tropical ocean and atmosphere.

关键词： Nolinear waves and their barotropic stability in the tropical ocean and atmosphere

Influence of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific on the inter-decadal variations of the stratosphere-troposphere exchange of water vapor

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Science china Earth Sciences 2008年第8期51卷 1179-1193页

作者： ZHAN RuiFen1,2&LI JianPing2 1shanghai typhoon institute of china Meteorological Administration,shanghai 2.0030,china 2State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,china 1. shanghai typhoon institute of china Meteorological Administration Shanghai 200030 China 2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

This study investigates the Stratosphere-Troposphere Exchange(STE) of water vapor,emphasizes its interdecadal variations over Asia in boreal summer,and discusses the influences of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific(WNP) on them by using the Wei method with reanalysis data from the European Centre for Medium-Range Weather Forecasts(ECMWF) for the years of *** climatology shows that the upward transport of water vapor across the tropopause in boreal summer is the most robust over the joining area of the South Asian Peninsula and Indian-Pacific Oceans(defined as AIPO).The upward transport over there can persistently convey the abundant water vapor into the stratosphere and then influence the distribution and variation of the stratospheric water *** analysis shows that interdecadal variations of the water vapor exchange over the AIPO are significant,and its abrupt change occurred in the mid-1970s and the early *** these three periods,as important channels of the water vapor exchange,the effect of Bay of Bengal-East Asia as well as South china Sea was gradually weakening,while the role of the WNP becomes more and more *** studies show that atmospheric heat sources over the Tibetan Plateau and the WNP are two main factors in determining the interdecadal variations of water vapor *** thermal influences over the Tibetan Plateau and the WNP have been greatly adjusted over the pass 44 *** synthesis influences the interdecadal variations of the water vapor exchange by changing the Asian summer monsoon,but their roles vary with time and *** after 1992,the influence of heat source over the Tibetan Plateau remarkably weakens,while the heat source over the WNP dominates the across-tropopause water vapor *** have important implications for understanding the transport of other components in the atmosphere and estimating the impact of human activities(

关键词： Tibetan Plateau tropical western North Pacific atmospheric heat source STE inter-decadal variations

Three-dimensional decomposition method of global atmospheric circulation

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Science china Earth Sciences 2008年第3期51卷 386-402页

作者： LIU HaiTao1,2,3, HU ShuJuan4, XU Ming5 & CHOU JiFan6,7 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, china 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, china 3 Beijing Climate Center, Beijing 100089, china 4 Department of Mathematics, Lanzhou University, Lanzhou 730000, china 5 shanghai typhoon institute, shanghai 2.0030, china 6 Department of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, china 7 china Meteorological Administration Training Center, Beijing 100089, china 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Graduate University of Chinese Academy of Sciences Beijing 100049 China 3. Beijing Climate Center Beijing 100089 China 4. Department of Mathematics Lanzhou University Lanzhou 730000 China 5. shanghai typhoon institute Shanghai 200030 China 6. Department of Atmospheric Sciences Lanzhou University Lanzhou 730000 China 7. china Meteorological Administration Training Center Beijing 100089 China

By adopting the idea of three-dimensional Walker, Hadley and Rossby stream functions, the global atmospheric circulation can be considered as the sum of three stream functions from a global perspective. Therefore, a m... 详细信息

关键词： three-dimensional decomposition of the global atmospheric circulation generalized Walker Hadley and Rossby stream functions existence and uniqueness vertical motion

A statistical analysis of typhoon frequency and application in design wave height

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Acta Oceanologica Sinica 2011年第4期30卷 24-32页

作者： WANG Liping ZHANG Jianfang LI Yongping ZHANG Yufang College of Mathematical Science Ocean University of China Qingdao 266071 China shanghai typhoon institute Shanghai 200030 China

A typhoon leading is an important natural disaster to many disasters to china. A giant wave caused by it has brought large threat for an offshore project. Based on the maximum entropy principle,one new model which has 4 undetermined parameters is constructed,which is called the discrete maximum entropy probabilistic model. In practical applications,the design wave height is considered as soon as possible in a typhoon affected sea areas,the result fits the observed data well. Further more this model does not have the priority compared with other distributions as Poisson distribution. The model provides a theoretical basis for the engineering design more reasonable when considering typhoon factors comprehensively.

关键词： discrete maximum entropy compound extreme values typhoon wave heights

The Nomogram for numerical predicting landfalling typhoon surges along the east coasts of Zhejiang and Jiangsu Provinces

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Acta Oceanologica Sinica 1988年第S1期 14-22页

作者： Liu Qinyu and Qin Zenghao institute of Physical Oceanography, Shandong College of Oceanography, Qingdao, china shanghai typhoon institute, SMA, shanghai, china

A Nomogram method for predicting typhoon surges is introduced in this paper. Based on the results obtained through numerical computation, in which 576 typhoons were taken into account, the Nomograms were plotted by using a revised method proposed by Chen and Qin. Having informed the parameters about the approaching typhoon the forecasters using the Nomograms and their own experiences can predict the peak surge, the time when the peak surge occurs and the time variation of the surge, which is caused by typhoon along the coasts of Zhejiang and Jiangsu Provinces, 24 hours before the typhoons reach these areas. The hindcast of the historical typhoon surge and forecast of typhoon surge in 1987 we have done indicate that the method is satisfactory.

关键词： The Nomogram for numerical predicting landfalling typhoon surges along the east coasts of Zhejiang and Jiangsu Provinces