Collaborative Research: Investigating Secondary Organic Aerosol (SOA) Formation in Central Los Angeles for Research at the Nexus of Air Quality and Climate Change (CalNex 2010)

合作研究：调查洛杉矶中部二次有机气溶胶 (SOA) 的形成，以研究空气质量与气候变化的关系 (CalNex 2010)

• 批准号: 0931492
• 负责人: Rodney Weber
• 金额: $ 33.66万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0931492&HistoricalAwards=false
• 关键词: Collaborative; Research; Investigating; Secondary; Organic

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The objective of this project is to identify major sources and physico-chemical processes that produce secondary organic aerosol (SOA) in a polluted urban atmosphere. The principal investigators will investigate Los Angeles SOA through participation in the Research at the Nexus of Air Quality and Climate Change (CalNex) 2010 experiment. This project will support the deployment and application of advanced instrumentation and data analysis techniques for chemical characterization of organic trace gases and fine particle organic aerosol in central Los Angeles during a 6-week period in June and July 2010. Highly detailed in-situ chemical speciation of organic aerosol by automated Thermal-desorption Aerosol Gas Chromatograph, and radiocarbon analysis of elemental, organic, water-insoluble, and water-soluble carbon collected on integrated filters will provide unique data to identify sources of SOA precursors. Processes and factors affecting gas/particle partitioning will be explored with instruments capable of measuring both gas- and particle-phase components. A combination of Particle Into Liquid Sampler, Mist Chamber and Total Organic Carbon (TOC) analyzer (PILS/MC/TOC) will comprehensively measure water-soluble gas/particle partitioning. This will be augmented by chemically specific measurements of gas/particle organic acids (PILS/MC/Ion Chromatography), and volatile and semi-volatile organic compounds via high-resolution Proton-Transfer Reaction Time of Flight Mass Spectrometer equipped with a thermal-desorption inlet. These instruments will add to the measurement capabilities at the CalNex central Los Angeles ground site and provide a unique data set for addressing the scientific objective through in-depth data analysis following the experiment. This project will build upon the strong collaboration started in the Study of Organic Aerosols in Riverside (SOAR-2005) to continue investigation of SOA sources and transformation in the urban environment.Development of analytical methods and measurement capabilities, the operation of a wide range of instruments over extended periods, and analysis of the large data sets will require a range in technical ability and make the project well suited for research teams of undergraduate and graduate students, and post-doctoral researches, and promote interaction with researchers from diverse backgrounds and disciplinary areas. Knowledge and experience gained by these co-workers will be valuable to both the atmospheric chemistry and local air quality communities.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该项目的目标是确定在污染的城市大气中产生二次有机气溶胶（SOA）的主要来源和物理化学过程。 主要研究人员将通过参与2010年空气质量和气候变化关系研究（CalNex）实验来调查洛杉矶SOA。 该项目将支持在2010年6月和7月的6周期间部署和应用先进仪器和数据分析技术，对洛杉矶中部的有机痕量气体和细颗粒有机气溶胶进行化学表征。 通过自动热解吸气溶胶气相色谱仪对有机气溶胶进行高度详细的原位化学形态分析，并对集成过滤器上收集的元素，有机，水不溶性和水溶性碳进行放射性碳分析，将为确定SOA前体的来源提供独特的数据。 过程和影响气体/颗粒分区的因素将探讨与仪器能够测量气相和颗粒相成分。 颗粒液采样器、喷雾室和总有机碳（TOC）分析仪（PILS/MC/TOC）的组合将全面测量水溶性气体/颗粒的分配。 这将通过气体/颗粒有机酸（PILS/MC/离子色谱法）的化学特定测量以及通过配备热解吸入口的高分辨率质子转移反应飞行时间质谱仪的挥发性和半挥发性有机化合物来增强。 这些仪器将增加CalNex中心洛杉矶地面站点的测量能力，并提供独特的数据集，通过实验后的深入数据分析实现科学目标。 该项目将建立在滨江有机气溶胶研究中开始的强有力的合作基础上（SOAR-2005）继续调查城市环境中SOA的来源和变化，发展分析方法和测量能力，在较长时间内操作各种仪器，大型数据集的分析将需要一系列的技术能力，使该项目非常适合本科生和研究生的研究团队，以及博士后研究，并促进与来自不同背景和学科领域的研究人员的互动。 这些同事获得的知识和经验对大气化学和当地空气质量社区都很有价值。