Models for Photochemistry and Transport off the East Coast of North America: Impact of Mesoscale Dynamics, Aqueous Chemistry and Fog

北美东海岸的光化学和运输模型：中尺度动力学、水化学和雾的影响

• 批准号: 9526184
• 负责人: M. Sanford Sillman
• 金额: $ 11.6万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 1999-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526184&HistoricalAwards=false
• 关键词: Models; Photochemistry; Transport; off; East

9526184 Sillman Recent measurements of tropospheric trace species were performed as part of the North Atlantic Regional Experiment (NARE) at remote marine locations along the North Atlantic coast. These species include ozone; which impacts human health, agricultural crops and ecosyqtems; hydroxyl radical, which controls tropospheric lifetimes of a wide range of species, including methane and halogenated hydrocarbons; and nitrogen oxides. These measurements provide important information about the chemistry of polluted continental air masses exported to the Atlantic Ocean. Preliminary results suggest that significant removal of reactive nitrogen occurs as continental air travels over the ocean, possibly associated with fog events. This project will investigate the export of chemically reactive species using a combined continental- and urban/regional-scale model developed by the PI. The urban/regional-scale model represents the photochemical evolution of urban plumes transported over water and includes the impact of vertically stratified circulation over water. The model chemistry will be enhanced to include aqueous reactions, and representation of fog events. This project could identify conditions that lead to the removal of nitric acid and PAN and quantify removal rates for these reactive nitrogen-containing species. Comparison of the model results with the NARE measurement data will be performed to assess and refine the model's ability to simulate chemical processing and transport of polluted continental air masses as they travel over the Atlantic Ocean.

9526184 Sillman 最近对对流层痕量物种的测量是作为北大西洋区域实验 (NARE) 的一部分，在北大西洋沿岸的偏远海洋地点进行的。这些物种包括臭氧；影响人类健康、农作物和生态系统；羟基自由基，控制着多种物质的对流层寿命，包括甲烷和卤代烃；和氮氧化物。这些测量结果提供了有关输送到大西洋的受污染大陆气团的化学成分的重要信息。初步结果表明，当大陆空气经过海洋时，活性氮会被大量去除，这可能与雾事件有关。 该项目将使用 PI 开发的大陆和城市/区域规模相结合的模型来调查化学活性物质的出口。城市/区域尺度模型代表了城市羽流在水上传输的光化学演化，包括水上垂直分层循环的影响。模型化学将得到增强，包括水反应和雾事件的表示。该项目可以确定导致硝酸和 PAN 去除的条件，并量化这些活性含氮物质的去除率。将模型结果与 NARE 测量数据进行比较，以评估和完善模型模拟污染大陆气团在大西洋上空传播的化学处理和运输的能力。