| 模式水平扩散参数化的数值分析与试验 |
| |
| 引用本文： | 葛孝贞,雷孝恩.模式水平扩散参数化的数值分析与试验[J].气象科学,1997,17(3):213-220. |
| |
| 作者姓名： | 葛孝贞 雷孝恩 |
| |
| 作者单位： | 南京大学大气科学系!南京,210093(葛孝贞),中国科学院大气物理研究所!北京,100029(雷孝恩) |
| |
| 基金项目： | 国家自然科学基金!49675266 |
| |
| 摘 要： | 为了研究整个对流层中水平扩散系数（Ｋｙ）随高度变化的参数化形式以及平流格式的数值扩攻对物质浓度分布的影响及二者对模式结果影响的相互关系,本文用“高分辨对流层物质交换模式”（ＥＭ３）对三咱不同ＫＹ参数化型能对行星边界层（ＰＢＬ）内受下垫面影响的高湍流ＰＢＬ以上整个对流层受水平风切变产生的切变湍流分层结构具有良好的描述能力;模式采用几乎无数值扩散二阶矩守恒的Ｐｒａｔｈｅｒ平流差分格式代替模式Ｓｍｏｌａ
|
| 关 键 词： | 水平扩散系数 切变湍流 污染物 数值分析 对流层 |
NUMERICAL ANALYSIS AND EXPERIMENT FOR THE MODEL HORIZONTAL DIFFUSION |
| |
| Ge Xiaozhen.NUMERICAL ANALYSIS AND EXPERIMENT FOR THE MODEL HORIZONTAL DIFFUSION[J].Scientia Meteorologica Sinica,1997,17(3):213-220. |
| |
| Authors: | Ge Xiaozhen |
| |
| Abstract: | In order to study effect of parameterization forms about variation of horlzontal eddy dif-fusivity (Ky or Kx) with height in the whole troposphere (TL) on species distribution, con-trastive numerical simulations for three kinds of Ky Patterns and two advection differencescheme are made with" A high resolution model for species exchange in TL: (EM3)". The re-sults show that layering structures on high frequency turbulence influenced by the relativemotion of the earth's surface in planetary boundary layer(PBL) and shear turbu1ence derivedfrom horizontal wind shear in TL 3bove PBL are very well described by JKy pattern; by sub-stituting Prather's scheme on conservation of second-order moments for Smolarkiewicz's pos-itive definite advection scheme,the numerical diffusion can decrease by one order of magni-tude,and horizontal mean motion of the species centers can very well described ; in the region-al pollutant motlel, comparing horizontal diffusion with both the horizontal advection and thenumerical diffusion,its role is not neglected,after Prather's scheme is introduced,the true at-mospheric Ky makes more important contribution to species transfer,especially in the upperhalf part of TL. |
| |
| Keywords: | horizontal diffusivity Numerical diffusion Em3 Shear turbulence PBL vertical structure |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《气象科学》浏览原始摘要信息 |
| 点击此处可从《气象科学》下载免费的PDF全文 |
|
