The Impact of Iodide-Mediated Ozone Deposition and Halogen Chemistry on Surface Ozone Concentrations Across the Continental United States
The Impact of Iodide-Mediated Ozone Deposition and Halogen Chemistry on Surface Ozone Concentrations Across the Continental United States
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DOI：
10.1021/acs.est.6b03556
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发表时间：
2017-02-07
影响因子：
11.4
通讯作者：
Saiz-Lopez, Alfonso
中科院分区：
文献类型：
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作者：
Gantt, Brett;Sarwar, Golam;Saiz-Lopez, Alfonso
美国许多大型沿海地区的空气质量受到城市污染和相对清洁的海洋气团汇合的影响，每个气团都有不同的大气化学成分。在这一背景下，利用社区多尺度空气质量(CMAQ)模式，研究了在侧边界条件和美国大陆周围沿海水域中，碘介导的臭氧(O-3)沉积在海水和海洋卤素化学中的作用。进行了几个嵌套模拟，其中这些卤素过程分别在美国大陆和半球CMAQ域中实施，后者为前者提供了侧边界条件。总体而言，正是在美国大陆范围内和来自横向边界条件的这些过程的结合，导致了模拟的地表O-3浓度的最大减少。地表O-3浓度的预测减少主要发生在CMAQ通常有很大高估的沿海地区。这些结果表明，对海洋区域卤素过程的真实描述可以改进对海岸附近O-3浓度的模式预测。
The air quality of many large coastal areas in the United States is affected by the confluence of polluted urban and relatively clean marine airmasses, each with distinct atmospheric chemistry. In this context, the role of iodide-mediated ozone (O-3) deposition over seawater and marine halogen chemistry accounted for in both the lateral boundary conditions and coastal waters surrounding the continental U.S. is examined using the Community Multiscale Air Quality (CMAQ) model. Several nested simulations are conducted in which these halogen processes are implemented separately in the continental U.S. and hemispheric CMAQ domains, the latter providing lateral boundary conditions for the former. Overall, it is the combination of these processes within both the continental U.S. domain and from lateral boundary conditions that lead to the largest reductions in modeled surface O-3 concentrations. Predicted reductions in surface O-3 concentrations occur mainly along the coast where CMAQ typically has large overpredictions. These results suggest that a realistic representation of halogen processes in marine regions can improve model prediction of O-3 concentrations near the coast.