Collaborative Research: Aerosol Impacts on the Regional and Global Environment

该项目将在2006年墨西哥城开展的“大城市对区域和全球环境的影响”(MIRAGE)活动以及洲际和大城市污染实验(IMPEX)期间，对NSF C-130飞机上的气溶胶粒子的光学和化学性质进行测量。该仪器套件包括一个凝聚核计数器(CNC)，一个用于测定黑碳质量、气溶胶大小和有机涂层的单颗粒烟尘光度计(SP-2)，一个用于测量气溶胶散射和吸收的光声吸收和散射光谱仪(PASS)，一个用于飞行后分析的气溶胶撞击收集器，用于使用傅立叶变换红外光谱(FT-IR)和电子显微镜进行分析，从而提供化学信息。此外，在MIRAGE项目期间，将在墨西哥城的一个下风向地面站点进行气溶胶测量，将使用获得的关于气溶胶性质的综合数据来观察大城市流出区的气溶胶的输送和转化，以及经过远距离输送跨越太平洋的气团。这些数据将用于验证化学运输模型。这将为污染物排放对区域和全球对流层组成的影响及其对气候的影响提供新的见解。该项目将加强美国和墨西哥多个机构的科学家之间的合作，并将为几名研究生提供教育机会。

This project will provide measurements of the optical and chemical properties of aerosol particles on the NSF C-130 aircraft during the 2006 Megacities Impacts on Regional and Global Environments (MIRAGE) Campaign to be conducted in Mexico City and the Intercontinental and Megacity Pollution Experiment (IMPEX). The instrument suite includes a Condensation Nuclei Counter (CNC), a Single Particle Soot Photometer (SP-2) to determine black carbon mass, aerosol size, and organic coatings, a Photoacoustic Absorption and Scattering Spectrometer (PASS) to measure aerosol scattering and absorption, an aerosol impaction collector for post-flight analysis using Fourier-Transform Infrared Spectroscopy (FT-IR) and electron microscopy, which will provide chemical information. In addition, during the MIRAGE project, aerosol measurements will be conducted at a ground-based site downwind of Mexico City.The comprehensive data obtained on aerosol properties will be used to observe the transport and transformation of the aerosols in the outflow region of a megacity, and air masses that have undergone long-range transport across the Pacific. The data will be used to validate chemical transport models. This will provide new insights on the effect of pollutant emissions on the regional and global tropospheric composition and its effect on climate.This project will enhance collaborations between U.S. and Mexican scientists from a number of institutions, and will provide educational opportunities for several graduate students.