Development of a high-resolution nested air pollution model - The numerical approach
Development of a high-resolution nested air pollution model - The numerical approach
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DOI：
10.1006/jcph.2002.7036
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发表时间：
2002-06-10
影响因子：
4.1
通讯作者：
Brandt, J
中科院分区：
文献类型：
--
作者：
Frohn, LM;Christensen, JH;Brandt, J
国家环境研究所（NERI）正在开发一个新的三维模型REGINA（区域高分辨率空气污染模型）。该模型基于NERI过去几十年开发的模型。目标是获得能够进行高分辨率操作的嵌套模型。为了达到这个目标，有必要实现足够精确的数值方法。该模型将用于研究丹麦的空气污染现象（监测、预报和情景）。在本文件中，概述了新的模式。描述了输运和化学的数值方法。模型中的水平输运采用精确的空间导数算法求解。这种方法传统上需要周期性的边界条件，这不适用于嵌套建模。因此，提出了一种计算非周期边界条件的新方法。该模型的化学部分的数值解是从两个现有的数值方法的一个新的组合的实施。本文给出了用Molenkamp-Crowley旋转试验对平流的数值解和平流与化学的耦合解进行广泛检验的结果。同样的试验也应用于有嵌套和无嵌套模式，结果表明，数值方法适用于模拟高分辨率的空气污染水平。(C)2002 Elsevier（美国）。
A new 3-D model REGINA (REGIonal high resolutioN Air pollution model) is under development at the National Environmental Research Institute (NERI). The model is based on models developed over the past decades at NERI. The goal is to obtain a nested model capable of high-resolution operation. To reach this goal it is necessary to implement sufficiently accurate numerical methods. The model will be applied to studying air pollution phenomena (monitoring, forecasting, and scenarios) over Denmark. In the present paper, the outline of the new model is presented. The numerical methods for transport and chemistry are described. The horizontal transport in the model is solved using an accurate space derivatives algorithm. This method traditionally requires periodic boundary conditions, which are not applicable for nested modeling. Therefore a new method for calculating nonperiodic boundary conditions has been developed. The numerical solution to the chemistry part of the model is obtained from an implementation of a new combination of two existing numerical methods. The results from extensive testing of the numerical solution of the advection and the coupling of the Solution of advection and chemistry in the model using Molenkamp-Crowley rotation tests are presented. The same tests have been applied to the model with and without nesting, The results show that the numerical methods are suitable for modeling air pollution levels at high resolution. (C) 2002 Elsevier (USA).