Application of a Shape-Preserving Advection Scheme to the Moisture Equation in an E-grid Regional Forecast Model   总被引：20，自引：1，他引：20  

Yu Rucong 《大气科学进展》1995,12(1):13-19

This paper presents a methodology which is very useful to design shape-preserving advection finite difference scheme on general E-grid horizontal arrangement of variables through introducing a two-step shape-preserving positive definite advection scheme in the moisture equation of the LASG-REM (LASG regional E-grid eta-coordinate forecast model). By trial-forecasting six local heavy raincases, the efficiency of the shape-preserving advection scheme in practical application has been examined. The LASG-REM with the shape-preserving advection scheme has a good forecasting ability for local precipitation.  相似文献   

Study of Effects of Beta Term and Nonlinear Advection on the Structure of Tropical Cyclones     

Luo Zhexian 《大气科学进展》1994,11(4):391-398

The effects of the Beta term on the typhoon structure are examined within the linear framework in terms of an analytical method of 2-D Fourier representation and numerical experiments by a Beta-plane quasi-geostrophic barotropic model. Results show that the joint effects of the difference of Rossby phase velocities and the dispersion of typhoon energy keep the maximum wind velocity reasonably evolving rather than irrestrictively increasing. On the one hand, the nonlinear advection accelerates typhoon vortex damping, and on the other, the high pressure system formed downstream due to energy dispersion makes it easy to maintain.  相似文献   

A Two-Step Shape-Preserving Advection Scheme   总被引：29，自引：3，他引：29  

Yu Rucong 《大气科学进展》1994,11(4):479-490

This paper proposes a new two-step non-oscillatory shape-preserving positive definite finite difference advection transport scheme, which merges the advantages of small dispersion error in the simple first-order upstream scheme and small dissipation error in the simple second-order Lax-Wendroff scheme and is completely different from most of present positive definite advection schemes which are based on revising the upstream scheme results. The proposed scheme is much less time consuming than present shape-preserving or non-oscillatory advection transport schemes and produces results which are comparable to the results obtained from the present more complicated schemes. Elementary tests are also presented to examine the behavior of the scheme.  相似文献   

NUMERICAL STUDY ON FUNCTIONS AFFECTING TROPICAL CYCLONE STRUCTURE AND MOTION^*          下载免费PDF全文

Chen Lianshou  Luo Zhexian 《Acta Meteorologica Sinica》1998,12(4):504-512

By using a beta-plane quasigeostrophic barotropic model,four numerical experiments with integration time more than five days are performed.Results show that the vorticity advection term and beta term are two basic factors significantly affecting tropical cyclone structure and motion.  相似文献   

Advection of plumes in mantle flow: implications for hotspot motion, mantle viscosity and plume distribution   总被引：8，自引：0，他引：8  

Bernhard Steinberger  & Richard J. O'Connell 《Geophysical Journal International》1998,132(2):412-434

  相似文献   

不同下垫面湍流输送计算方法的研究   总被引：9，自引：0，他引：9       下载免费PDF全文

刘树华  刘和平 《应用气象学报》1996,7(2):229-237

文章应用三种不同下垫面近地面层风速和温度梯度资料，代入风速和温度廓线公式，迭代求得感热通量及热量交换系数。确定Kh /Kw与稳定参数ξ的关系式。分别利用空气动力学方法和波文比能量平衡法计算潜热通量，并进行了比较。  相似文献   

Studies　on　Non-interpolating　Semi-Lagrangian　Scheme　and　Numerical　Solution　to　KdV　Equation     

Chen Jiabin  Wang Jun 《大气科学进展》1996,13(2):265-268

A new non-interpolating semi-Lagrangian scheme has been proposed, which can eliminate any interpolation, and consequently numerical smoothing of forecast fields. Here the new scheme is applied to KdV equation and its performance is assessed by comparing the numerical results with those produced by Ritchie’s scheme (1986). The comparison shows that the non-interpolating semi-Lagrangian scheme appears to have efficiency advantages.  相似文献   

Multispectrum Method and the Computation of Vapor Equation     

Ji Zhongzhen  Wang Bin 《大气科学进展》1997,14(4):563-568

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一次爆发性气旋的发展与湿位涡关系的研究   总被引：13，自引：3，他引：13  

牛宝山  丁治英  王劲松 《南京气象学院学报》2003,26(1):8-16

通过对一次陆地爆发性气旋的数值模拟与湿位涡的诊断分析发现，气旋的爆发与湿位涡的平流关系密切，气旋的发展并不是在湿位涡中心位于气旋上空时才开始，而是当湿位涡中心位于气旋的后部，并在200hPa对下有明显的倒圆锥形下伸区时，才有利于气旋的发展。当湿位涡中心位于气旋上空时，气旋发展开始减慢。湿位涡局地变化的大小与水平方向位涡梯度的大小有关。湿斜压位涡负值区的上下贯通与气旋发展也有明显的关系。  相似文献   

咸阳机场两次能见度突变天气的对比分析     

高洁  刘仙婵 《沙漠与绿洲气象(新疆气象)》2003,26(2):17-18

对咸阳机场的两次能见度突然转差的天气进行分析比较，探讨该类形势下大雾的成因及周边地理环境对成雾的影响，并对此类天气的预报思路提出几点建议。  相似文献