Ozone Photochemistry in China: Field Measurements and Modeling Analysis

该项目是一项努力的继续，目的是更好地了解导致臭氧形成的地面光化学，臭氧是一种对人类健康有不利影响的污染物。臭氧前体的测量将作为一项名为“特大城市-北京和华北平原空气污染研究运动”的国际研究的一部分。这是2007年8月的一次活动的后续活动，将包括来自法国、日本、德国、香港、美国以及中国的科学家。了解中国上空的臭氧光化学对了解全球光化学具有重要意义。将进行光化学和输运模拟，以分析现场的光化学和原位臭氧生成。与当地光化学有关的几个问题将进一步分析。这些研究包括对非均相生产亚硝酸盐的关键途径的研究，以及对气溶胶表面羟基自由基损失的研究。来自实地和卫星测量的数据将使用三维区域化学输送模型（REAM）进行分析。将进行光化学反应的模型模拟，受限于长寿命物质的浓度和中间物质如过氧乙酰硝酸盐、过氧硝酸和乙二醛的观察。这项工作的研究成果将用于更新模型中使用的一些光化学机制。

This project is a continuation of an effort to better understand the ground level photochemistry that causes the formation of ozone, a pollutant with adverse effects on human health. Measurements of ozone precursors will be made as part of an international study named The Campaigns of Air Pollution Research in Megacity - Beijing and the North China Plain. This is a follow-on campaign to one that took place in August 2007 and will include scientists from France, Japan, Germany, Hong Kong, and the USA, as well as from China. Understanding ozone photochemistry over China is important to understanding global photochemistry.Both photochemical and transport modeling will be conducted to analyze the photochemistry and in-situ production of ozone at the site. Several issues related to the local photochemistry will be further analyzed. These include the investigation of key pathways for heterogeneous production of nitrous acid and for the loss of hydroperoxyl radicals onto aerosol surfaces. Data from the in situ and satellite measurements will be analyzed using the 3-D Regional chEmical trAnsport Model (REAM). Model simulations of photochemical reactions will be conducted, constrained by the concentrations of long-lived species and observations of intermediate species such as peroxyacetyl nitrate, peroxynitric acid, and glyoxal. The research results of this effort will be used to update some of the photochemical mechanisms used in the model.