Collaborative Research: Investigation of Ozone Photochemistry in Lower Free Troposphere Continental Outflow Traveling Over the North Atlantic

合作研究：对流经北大西洋的低层自由对流层大陆流出物中的臭氧光化学进行调查

• 批准号: 0718316
• 负责人: Detlev Helmig
• 金额: $ 27.76万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0718316&HistoricalAwards=false
• 关键词: Collaborative; Research; Investigation; Ozone; Photochemistry

In this project, ozone (O3), NOx (NO+NO2), peroxyacetyl nitrate (PAN), non-methane hydrocarbons (NMHC), and carbon monoxide (CO) will be measured continuously over two full summers at the Pico mountain observatory in the Azores, in order to study transport events over a range of transport altitudes and pathways. To identify and attribute pollution transport events, FLEXPART particle dispersion model simulations of the transport of anthropogenic and boreal wildfire emissions to Pico will be conducted, and all events with observed anthropogenic impacts and minimal boreal fire impacts will be analyzed. Tropospheric O3, CO, and NO2 from the TES, OMI, and SCIAMACHY satellite sensors will be analyzed to assess the importance of the sampled events relative to the total column. Data will be analyzed in conjunction with GEOS-Chem chemical transport model (CTM) simulations to evaluate the ability of the CTM to simulate observed absolute and relative enhancements in measured species and to probe the consistency between observations and simulated photochemistry and mixing. New techniques will be used that combine high-resolution FLEXPART simulations with CTM output to obtain a semi-Lagrangian sampling of CTM simulations in pollution transport events. By analyzing multiple events over two summer seasons, the data will be used to quantify the contribution of such events to large-scale impacts of continental outflow on O3 and O3 precursors. This work will lead to reduced uncertainties in estimates of the impacts of anthropogenic and boreal fire emissions on tropospheric O3. It will provide new information on variability in remote lower free tropospheric O3 and PAN resulting from inter-annual variability in boreal fire activity. This project will contribute to teaching and training by providing a doctoral research topic for one graduate student as well as an undergraduate research project; through the sharing of research findings with high school teachers in the Azores; and through a web site. It will enhance research infrastructure by maintaining the Pico station during a period of transition to a permanent Global Atmosphere Watch (GAW) station. A Pico GAW station would be a valuable resource for the atmospheric science community for long-term monitoring of atmospheric composition and trans-Atlantic pollution transport, and as a base for research intensives.

在该项目中，将在亚速尔群岛的皮科山观测站连续两个夏天连续测量臭氧（O3）、氮氧化物（NO+NO2）、过氧乙酰硝酸盐（PAN）、非甲烷碳氢化合物（NMHC）和一氧化碳（CO），以研究一系列运输高度和路径上的运输事件。 为了识别和归因污染传输事件，将对人为和北方野火排放物向 Pico 的传输进行 FLEXPART 粒子扩散模型模拟，并对所有观察到的人为影响和北方火灾影响最小的事件进行分析。 将分析来自 TES、OMI 和 SCIAMACHY 卫星传感器的对流层 O3、CO 和 NO2，以评估采样事件相对于总柱的重要性。 数据将与 GEOS-Chem 化学输运模型 (CTM) 模拟结合进行分析，以评估 CTM 模拟所测量物种中观察到的绝对和相对增强的能力，并探讨观察结果与模拟光化学和混合之间的一致性。 将使用新技术，将高分辨率 FLEXPART 模拟与 CTM 输出相结合，以获得污染输送事件中 CTM 模拟的半拉格朗日采样。 通过分析两个夏季的多个事件，这些数据将用于量化这些事件对大陆流出物对 O3 和 O3 前体的大规模影响的贡献。 这项工作将减少人为和北方火灾排放对对流层 O3 影响估计的不确定性。 它将提供有关由北方火灾活动的年际变化引起的偏远低层自由对流层 O3 和 PAN 变化的新信息。 该项目将通过为一名研究生提供一个博士研究课题以及一个本科生研究项目来促进教学和培训；通过与亚速尔群岛的高中教师分享研究成果；并通过网站。 它将通过在向永久全球大气监视站（GAW）过渡期间维护皮科站来加强研究基础设施。 Pico GAW 站将成为大气科学界长期监测大气成分和跨大西洋污染传输的宝贵资源，并作为密集研究的基地。