Abstract The performance of aerosol dry deposition schemes of the regionally adapted chemistry transport model CHIMERE2017 (version 2017r4) is evaluated. The model is simulated over the domain of Arabian Peninsula for a period of one year starting from November 2016 to October 2017 using two different dry deposition schemes, ( Wesely, 1989 ) and ( Zhang et al., 2001 ). The daily accumulations of the simulated total aerosol deposition fluxes are compared with the corresponding measurements carried out by means of a dust deposition gauge in Abu Dhabi, United Arab Emirates. The monthly mean aerosol deposition flux at the measurement site during the study period is 0.0112 kg m−2 month−1, which is in agreement with observations from other locations in the Middle East and North Africa. The simulated deposition flux over the Arabian Peninsula shows large spatiotemporal variability peaking in the south in summer and in the eastern and northeastern parts of the peninsula in spring. By contrast, winter and autumn are characterized by comparatively low deposition levels on the entire peninsula. Dry deposition is found to be the most effective removal mechanism of atmospheric aerosols in the region with several orders of magnitude higher flux levels than its wet counterpart. The results indicate that the size-resolved deposition scheme of Zhang et al., 2001 is the most suitable one on the Arabian Peninsula. The simulated yearly accumulated total deposition fluxes on the inlands and coastal regions of the peninsula are respectively in the range 0.1–0.5 kg m−2 year−1 and 0.01–0.1 kg m−2 year−1.

中文翻译：

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使用 CHIMERE-2017 模拟阿拉伯半岛上空的气溶胶沉积通量：对不同干沉积方案的敏感性

摘要 评估了区域适应性化学输运模型 CHIMERE2017（2017r4 版）的气溶胶干沉降方案的性能。该模型使用两种不同的干沉积方案，(Wesely, 1989) 和 ( Zhang et al., 2001 ) 在阿拉伯半岛区域模拟了一年时间，从 2016 年 11 月到 2017 年 10 月。模拟的总气溶胶沉积通量的每日累积量与在阿拉伯联合酋长国阿布扎比通过灰尘沉积计进行的相应测量进行了比较。研究期间测量地点的月平均气溶胶沉积通量为 0.0112 kg m-2 month-1，这与中东和北非其他地点的观测结果一致。阿拉伯半岛上的模拟沉积通量显示，夏季南部和春季东部和东北部地区出现大的时空变化。相比之下，冬季和秋季的特点是整个半岛的沉积量相对较低。发现干沉降是该地区大气气溶胶最有效的去除机制，其通量水平比湿沉降高几个数量级。结果表明，Zhang et al., 2001 的尺寸分辨沉积方案是最适合阿拉伯半岛的方案。半岛内陆和沿海地区的模拟年累积总沉积通量分别在0.1-0.5 kg m-2 year-1 和0.01-0.1 kg m-2 year-1 范围内。