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Search Results: 1 - 10 of 18677 matches for " GAO Shouting "
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The Instability of the Vortex Sheet along the Shear Line
Gao Shouting,

大气科学进展 , 2000,
Abstract: The traditional Kelvin-Helmholtz notion of studying the shear instability is not suitable for the case associated with shear line with the strong wind shear in the vortex sheet. Since then. the shear instability becomes the instability of the vortex sheet. If the velocity is induced by the vortex sheet. the inequalities (l - R_r + Ri_d )> 0 and U(v.t)> U(A(t)) become the criterion of the vortex sheet instability. This criterion indicates that 1) the disposition of environment field restrains the disturbance developing along the shear line. 2) There exist multi-scale interactions in the unstable process of the shear line. The calculation of the necessary condition for the instability is also presented in this paper.
An experiment study of lee vortex with large topography forcing
Shouting Gao,Fan Ping
Chinese Science Bulletin , 2005, DOI: 10.1007/BF02897535
Abstract: This paper, relates the lee vortex which is triggered when the rotating and stratified flow passes over the large obstacle by using towing tank and based on the similarity. The results show that Froude number Fr is the most important parameter, and, in the rotating case, the lee vortex is easily triggered, because the rotating may, on one hand, lead to downward flow, on the other hand, induce lee vortex through generating geostrophic vorticity. Even in the non-rotating case, the lee vortex can be still formed, as long as both Froude number Fr and stratification parameter N are appropriate. For the formation mechanism of the lee vortex, there are obvious differences in the rotating case compared with the non-rotating case. In the non-rotating case, the tilting term of the perturbation vorticity is a dominant factor of inducing the lee vortex. However, in the rotating case, effect and the convergence of perturbation vorticity are dominant factors.
On the parameterization scheme of gravity wave drag effect on the mean zonal flow of mesosphere
Shouting Gao,Lingkun Ran
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03184219
Abstract: Based on McFarlane’s parameterization scheme of gravity wave drag, a refined gravity-wave-drag scheme is presented. Both the drag effect of the momentum flux and the dissipation effect of gravity wave breaking on the mean zonal flow are included in the refined parameterization scheme. The dissipation effect can be formulated with the gravity wave numbers and the mean quantities. The refined parameterization scheme may represent a complete drag effect of stationary gravity wave breaking on the mean zonal flow.
A-B Hybrid Equation Method of Nonlinear Bifurcation in Wave-Flow Interaction

Gao Shouting,

大气科学进展 , 1991,
Abstract: In this paper, A-B hybrid equation method is given. This method is different not only from high truncated spec-tral method, but also from amplitude evolution method. Dynamic problem in the baroclinic atmosphere may be transferred into complex Lorenz system by means of the method. Therefore, this method is an effective tool for stud-ying nonlinear bifurcation in wave-flow interaction. Meanwhile, it is of advantage to use this method, because it can overcome a lot of difficulties existing in high truncated spectral method and amplitude evolution method.

Gao Shouting,

大气科学进展 , 1988,
Abstract: In this paper, a barotropic model is used to discuss the nonlinear Rossby wave induced by the large-scale topography. By using separate multi-scale perturbation method and matching boundary condition, the general-ized KDV equation is obtained. Especially, in consideration of the effect of the Tibetan Plateau, the distribu-tions of the disturbance stream function is given. It is proved that solitary wave induced by the large-scale topog-raphy exists indeed and it has direct influence on the weather of its lower reaches.
Streamwise Vorticity Equation
Gao Shouting,Lei Ting,
Gao Shouting
,Lei Ting

大气科学进展 , 2000,
Abstract: A streamwise vorticity equation is derived in generalized natural coordinates. This equation reveals that the total change and local change of the streamwise vorticity are mainly determined by the curvature of streamline, unsteady feature of streamline and magnitude of velocity. This equation enables the study of mesoscale or small-scale systems since the term associated with pressure gradient force in the original vorticity equation is replaced by terms associated with streamlines and wind speed. With this modification the wind field rather than the pressure field is used in the calculation considering that 1) the pressure field is to adapt wind field. 2) Smoother and more consecutive streamline pattern is easier to obtain either by data analysis or by the numerical simulation. From this sense, this present study suggests the application of this equation to studying the evolution of severe storm system as well as other simplified cases.
Impacts of Initial Conditions on Cloud-Resolving Model Simulations
GAO Shouting,Xiaofan LI,
GAO Shouting
,Xiaofan LI

大气科学进展 , 2008,
Abstract: Impacts of initial conditions on cloud-resolving model simulations are investigated using a series ofsensitivity experiments.Five experiments with perturbed initial temperature,moisture,and cloud conditionsare conducted and compared to the control experiment.The model is forced by the large-scale verticalvelocity and zonal wind observed and derived from NCEP/Global Data Assimilation System(GDAS).Theresults indieate that model predictions of rainfall are much more sensitive to the initial conditions than thoseof temperature and moisture.Further analyses of the surface rainfall equation and the moisture and cloudhydrometeor budgets reveal that the calculations of vapor condensation and deposition rates in the modelaccount for the large sensitivities in rainfall simulations.
Moisture Transport over the Arabian Sea Associated with Summer Rainfall over Pakistan in 1994 and 2002

Kalim ULLAH,GAO Shouting,

大气科学进展 , 2012,
Abstract: In this study, we aimed to elucidate the critical role of moisture transport affecting monsoon activity in two contrasting summers over the Arabian Sea during the years 1994, a relatively wet year, and 2002, a relatively dry year. A comprehensive diagnostic evaluation and comparisons of the moisture fields were conducted; we focused on the precipitation and evaporation as well as the moisture transport and its divergence or convergence in the atmosphere. Monthly mean reanalysis data were obtained from the National Centers for Environmental Prediction (NCEP-I and -II). A detailed evaluation of the moisture budgets over Pakistan during these two years was made by calculating the latent energy flux at the surface (E-P) from the divergence of the total moisture transport. Our results confirm the moisture supply over the Arabian Sea to be the major source of rainfall in Pakistan and neighboring regions. In 1994, Pakistan received more rainfall compared to 2002 during the summer monsoon. Moisture flow deepens and strengthens over Arabian Sea during the peak summer monsoon months of July and August. Our analysis shows that vertically integrated moisture transport flux have a significant role in supplying moisture to the convective centers over Pakistan and neighboring regions from the divergent regions of the Arabian Sea and the Bay of Bengal. Moreover, in 1994, a deeper vertically integrated moisture convergence progression occurred over Pakistan compared to that in 2002. Perhaps that deeper convergence resulted in a more intense moisture depression over Pakistan and also caused more rainfall in 1994 during the summer monsoon. Finally, from the water budget analysis, it has been surmised that the water budget was larger in 1994 than in 2002 during the summer monsoon.
Introduction of the Direct Method by Illustrating Schr?dinger Equation and Its Application to Wave-Wave Striking Interaction

Gao Shouting,Liu Kunru,

大气科学进展 , 1990,
Abstract: In this paper, both direct method and its application to wave-wave striking interaction are introduced by illus-trating Schr?dinger equation describing the amplitude evolution of some mesoscale systems.
Dependence of the Accuracy of Precipitation and Cloud Simulation on Temporal and Spatial Scales

GAO Shouting,Xiaofan LI,

大气科学进展 , 2009,
Abstract: Precipitation and associated cloud hydrometeors have large temporal and spatial variability, which makes accurate quantitative precipitation forecasting difficult. Thus, dependence of accurate precipitation and associated cloud simulation on temporal and spatial scales becomes an important issue. We report a cloud-resolving modeling analysis on this issue by comparing the control experiment with experiments perturbed by initial temperature, water vapor, and cloud conditions. The simulation is considered to be accurate only if the root-mean-squared difference between the perturbation experiments and the control experiment is smaller than the standard deviation. The analysis may suggest that accurate precipitation and cloud simulations cannot be obtained on both fine temporal and spatial scales simultaneously, which limits quantitative precipitation forecasting. The accurate simulation of water vapor convergence could lead to accurate precipitation and cloud simulations on daily time scales, but it may not be beneficial to precipitation and cloud simulations on hourly time scales due to the dominance of cloud processes.
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