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首页> 外文期刊>Atmospheric environment >Impact of sea-salt emissions on the model performance and aerosol chemical composition and deposition in the East Mediterranean coastal regions
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Impact of sea-salt emissions on the model performance and aerosol chemical composition and deposition in the East Mediterranean coastal regions

机译：海盐排放对东地中海沿海地区模型性能以及气溶胶化学成分和沉积的影响

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摘要

East Mediterranean region is often exposed to significant levels of paniculate matter (PM), partly due to the natural emission sources surrounding the area. The complex coastal geography together with the high water coverage of the area implies important contribution of sea-salt aerosols (SSA) to the PM levels and composition. WRF-CMAQ air quality modeling system has been employed to simulate and quantify the impacts of SSA emissions on the model performance in the region. The results show up to one order of magnitude higher SSA emissions when surf-zone emissions are added. 10-20% improvements are calculated in terms of model discrepancies of PM_(10) mass with regards to the observations. SSA related particles (sodium (Na~+) and chloride (Cl~-)) are more realistically represented. The total nitrate (NO_3) partitioning ratio increases substantially up to 0.5 on average when SSA emissions are inserted to the model, leading to nitric acid (HNO_3) levels decrease by more than 40% and total NO_3 aerosols increase by more than an order of magnitude over the source areas. Adding surf-zone emissions over those from open-ocean increase PM_(10) deposition by up to 11% and wet deposition by around 1%. The results suggest that coastal areas are important sources of SSA emissions and can significantly alter the PM levels and composition in their vicinities.
机译：东地中海地区经常暴露于大量的颗粒物（PM）中，部分原因是该地区周围的自然排放源。复杂的沿海地理环境以及该地区的高水覆盖率意味着海盐气溶胶（SSA）对PM水平和成分的重要贡献。 WRF-CMAQ空气质量建模系统已被用来模拟和量化SSA排放对该地区模型性能的影响。结果表明，添加冲浪区排放量后，SSA排放量最多增加一个数量级。根据PM_（10）质量相对于观测值的模型差异计算得出10-20％的改进。与SSA有关的颗粒（钠（Na〜+）和氯化物（Cl〜-））更真实地表示出来。将SSA排放物插入模型后，总硝酸盐（NO_3）分配比平均增加到平均最高0.5，导致硝酸（HNO_3）含量降低超过40％，总NO_3气溶胶增加超过一个数量级。在源区域上。与开放海域的排放相比，增加海浪排放可将PM_（10）沉积增加多达11％，将湿式沉积增加约1％。结果表明，沿海地区是SSA排放的重要来源，并且可以显着改变其附近的PM水平和组成。

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