Contribution of HONO sources to the NO_x/HO_x/O₃ chemistry in the polluted boundary layer

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• 作者：Aumont ; Bernard ; Chervier ; Fr&eacute ; d&eacute ; ric ; Laval ; Sophie
• 关键词：Nitrous acid ; Photochemical pollution ; Pollution model
• 刊名：Atmospheric Environment
• 出版年：2003
• 期刊代码：11_13522310
• 类别：env
• 出版时间：February, 2003
• 卷：37
• 期：4
• 页码：487-498
• 文件大小：231 K

摘要

The contribution of HONO photolysis to the primary production of OH radicals and the impact of HONO sources to the O₃ and NO_x budgets has been investigated using a two-layer box model. Three sources of HONO were considered: direct emissions, heterogeneous production on the ground surface and heterogeneous production on the aerosol surface. We considered two scenarios representing typical urban and polluted rural area and simulations were conducted for both summer and winter conditions. For summertime conditions, HONO sources were found to have a slight impact on the NO_x/HO_x/O₃ concentration profiles, except for conditions favoring the formation of photochemical pollution episodes where it becomes significant. For wintertime conditions, HONO sources were found to be major contributors to the primary OH production, leading to major changes in the HO_x and NO_x budget all day long.