Abstract

The problem of air pollution in Almaty city in stagnant weather conditions is considered. Such conditions are so frequent, because the city is located at the foothills of the mountain range of Ile Alatau. The WRF-Chem complex model is used for the analysis and allows a high-detail simulation both of the atmospheric circulation and the transport of various pollutants, taking into account their chemical transformations. The results of modeling meteorological processes are compared with observational data. The main attention is paid to the calculation of the sulfur dioxide plume emitted by the pipes of the coal-fired CHP-2. The simulations showed that regional latitudinal wind, whose direction regularly changes to the opposite one, dominates in the northern part of the city atmosphere. During such periods and under unstable atmosphere stratification conditions, the plume dissipates and pollutants penetrate into the surface layer. In some areas, the concentration of SO₂ significantly exceeds sanitary standards.

中文翻译：

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恶劣天气条件下阿拉木图市空气污染模拟

摘要

考虑了阿拉木图市在停滞的天气条件下的空气污染问题。这种情况如此频繁，因为这座城市位于 Ile Alatau 山脉的山脚下。WRF-Chem 复杂模型用于分析，并允许对大气环流和各种污染物的传输进行高细节模拟，同时考虑到它们的化学转化。将气象过程建模的结果与观测数据进行比较。主要关注燃煤CHP-2管道排放的二氧化硫羽流的计算。模拟结果表明，区域性纬向风在城市大气的北部占主导地位，其方向有规律地改变为相反的方向。在此期间，在不稳定的大气分层条件下，羽流消散，污染物渗透到表层。部分地区 SO 浓度₂显着超过卫生标准。