Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 18 2009 10.5194/acp-9-6849-2009 http://www.atmos-chem-phys.net/9/6849/2009/ http://www.atmos-chem-phys.net/9/6849/2009/acp-9-6849-2009.html http://www.atmos-chem-phys.net/9/6849/2009/acp-9-6849-2009.pdf 6849 6863 2009-09-21 Oxygenated organic functional groups and their sources in single and submicron organic particles in MILAGRO 2006 campaign S. Liu S. Takahama L. M. Russell lmrussell@ucsd.edu S. Gilardoni D. Baumgardner Scripps Institution of Oceanography, Univ. of California, San Diego, La Jolla, California, USA Joint Research Centre, European Commission, Ispra, Italy Centro de Ciencias de la Atmósfera, Univ. Nacional Autónoma de México, México City,~México Fourier Transform Infrared (FTIR) and X-ray Fluorescence (XRF) were used to measure organic functional groups and elements of submicron particles collected during MILAGRO in March 2006 on three platforms: the Mexico City urban area (SIMAT), the high altitude site at 4010 m (Altzomoni), and the NCAR C130 aircraft. Scanning Transmission X-ray Microscopy (STXM) and Near-Edge X-ray Absorption Fine Structure (NEXAFS) were applied to single particle organic functional group abundance analysis of particles simultaneously collected at SIMAT and C130. Correlations of elemental concentrations showed different groups of source-related elements at SIMAT, Altzomoni, and C130, suggesting different processes affecting the air masses sampled at the three platforms. Cluster analysis resulted in seven distinct clusters of FTIR spectra, with the last three clusters consisting of spectra collected almost exclusively on the C130 platform, reflecting the variety of sources contributing to C130 samples. Positive Matrix Factorization (PMF) of STXM-NEXAFS spectra identified three main factors representing soot, secondary, and biomass burning type spectra. PMF of FTIR spectra resulted in two fossil fuel combustion factors and one biomass burning factor, the former representative of source regions to the northeast and southwest of SIMAT. Alkane, carboxylic acid, amine, and alcohol functional groups were mainly associated with combustion related sources, while non-acid carbonyl groups were likely from biomass burning events. The majority of OM and O/C was attributed to combustion sources, although no distinction between direct emissions and atmospherically processed OM could be identified. Ade, H. and Urquhart, S. 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