In this study, dispersion and deposition of atmospheric mercury (Hg) in Tehran city was simulated using WRF-SMOKE-CMAQ models. The Weather Research and Forecasting (WRF) model was used to simulate the meteorological parameters. For validation of WRF results, the simulated wind speeds and temperatures were compared with the parameters measured at a meteorological station in Tehran city for 11 days (8 days in fall and 3 days in winter) in 2010–2011. The correlation coefficient ( r ) for temperature and wind speed was 0.94 and 0.49, respectively, indicating there was good agreement between measured and modeled results. An atmospheric mercury emission inventory was developed using the United Nations Environment Programme (UNEP), the United States Environmental Protection Agency AP-42 (US-EPA AP-42), and related papers. Sparse Matrix Operator Kernel Emissions (SMOKE) was used to allocate the atmospheric mercury emissions to the modeling domain, and the Community Multiscale Air Quality (CMAQ) model was used to simulate the concentration and deposition of atmospheric mercury. To validate the results of the CMAQ model, the simulated atmospheric particulate mercury (PHg) concentrations for 11 days were compared with the measured results at two different stations (Bagh Ferdows and Bahman Square) where it was measured by the Tehran Air Quality Control Company (AQCC). Comparison between the results from the modeled and measurements of PHg in fall was better than winter. Concentrations and dry depositions of the various forms of atmospheric mercury were higher in areas closer to mercury stationary emission sources.

中文翻译：

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德黑兰市大气汞扩散和沉积模拟

在这项研究中，使用 WRF-SMOKE-CMAQ 模型模拟了德黑兰市大气汞 (Hg) 的扩散和沉积。气象研究与预报（WRF）模型用于模拟气象参数。为了验证 WRF 结果，模拟的风速和温度与 2010-2011 年在德黑兰市气象站测量的参数进行了 11 天（秋季 8 天，冬季 3 天）的比较。温度和风速的相关系数 (r) 分别为 0.94 和 0.49，表明测量结果和模拟结果之间存在良好的一致性。大气汞排放清单是使用联合国环境规划署 (UNEP)、美国环境保护署 AP-42 (US-EPA AP-42) 和相关文件制定的。使用稀疏矩阵算子核排放 (SMOKE) 将大气汞排放分配到建模域，并使用社区多尺度空气质量 (CMAQ) 模型模拟大气汞的浓度和沉积。为了验证 CMAQ 模型的结果，将 11 天的模拟大气颗粒汞 (PHg) 浓度与德黑兰空气质量控制公司在两个不同站点（Bagh Ferdows 和 Bahman Square）测量的结果进行了比较（质检总局）。模拟结果与秋季 PHg 测量结果的比较优于冬季。在靠近汞固定排放源的地区，各种形式的大气汞的浓度和干沉降较高。