精细PBL模式及其诊断应用

周幂; 蒋维楣; 胡非

精细PBL模式及其诊断应用

1.
南京大学大气科学系, 江苏南京 210093
2.
中科院大气所大气边界层物理与大气化学实验室

基金项目: 国家重点基础研究项目G1999043400;中科院大气所LAPC“九五”项目KZ952－51－405

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出版历程
- 收稿日期: 1999-04-12
- 修回日期: 1999-07-12

AN IMPROVED PBL MODEL AND ITS DIAGNOSTIC APPLICATION

1.
Department of Atmospheric Sciences, Nanjing University, Nanjing, 210093, China
2.
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academic of Sciences

摘要

摘要: 在已建立的一种三维非静力细网格E-ε湍能闭合的动力学框架基础上,作了一些改进的技术处理和试验,包括:(1)利用GIS提供的地形资料,较精确地计算太阳辐射,进而诊断地面温度;(2)引进位势流概念,处理稳定层结条件下初始内插风场的风向变化;(3)引入动力学调整项G(α_obs-α).在此基础上,就地理信息系统(GIS)提供的一个 60km×48km区域作了边界层结构和湍流特征的数值模拟试验,并与实测作了比较,讨论了精细PBL模式的模拟效果,结果表明,新建的PBL模式能较好地模拟表征出复杂下垫面地域的陡峭地形和不规则海岸线对局地风场和湍流场的动力和热力学作用。
- 非静力 /
- E-ε /
- 湍流闭合 /
- 复杂地形 /
- PBL数值模拟
Abstract: Based on a 3-dimensional fine-mesh non-hydrostatic and energy closure (E-ε)scheme, the present study makes some modification and numerical tests, as follows: (1) making use of the terrain data from GIS (geography information system), the distribution of solar radiation is calculated more precisely, so that the surface temperature is diagnosed more exactly. (2) potential flow concept is introduced to the interpolation of l/r² scheme, for consideration of wind deflection under the stable stratification condition. (3) A dynamical adjustment term, G(α_obs-α), is applied. Numerical tests are made for the Hong Kong area (60km×48km) and PBL simulation are obtained with the data provided by GIS. It is shown that the improved PBL model can simulate more reasonably the effect of the abrupt terrain and irregular coasts. effects on local wind fields and turbulence field over complex terrain. It is also shown that the results obtained from this model better agree with observations.
- nonhydrostatic model /
- energy closure (E-ε /
- )scheme /
- complex terrain /
- PBL numerical simulation

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参考文献(6)

[1]	PIELKE R A,PEARCE R P.Mesoscale modeling of the atmosphere[J].Meteorological Monographs,1994,25(47):1～39.
[2]	WANG Wei-guo,JIANG Wei-mei.A 3-D nonhydrostatic dispersion modeling system for modeling of atmospheric transport and diffusion over coastal complex terrain in the Hong Kong-Shenzhen area [J].Meteorology and Atmospheric Physics,1998,68：23～34.
[3]	李占清,翁笃鸣.一个计算山地地形参数的计算机模式[J].地理学报,1987,42：269-278.
[4]	AKULA V,JOHN C W. Lectures on air pollution modeling. American Meteorological,Boston,1988.285.
[5]	MARTIN F,PALOMINO I,ACENA B.Evaluation of two wind field models for complex terrain.Computer Simulation.II:Air Pollution.Computational Mechanics Publications,1994,1：48～56.
[6]	JAMES E H,RICHARD A A.The initialization of numerical models by dynamic-initialization technique[J].Mon.Wea.Rev.,1976,104：1551～1556.