Mexico City aerosol analysis during MILAGRO using high resolution aerosol mass spectrometry at the urban supersite (T0) – Part 1: Fine particle composition and organic source apportionment
Allison C. Aiken,Allison C. Aiken,D. Salcedo,Michael J. Cubison,J. A. Huffman,Peter F. DeCarlo,Peter F. DeCarlo,Ingrid M. Ulbrich,Kenneth S. Docherty,Donna Sueper,Joel R. Kimmel,Douglas R. Worsnop,A. Trimborn,M. J. Northway,Elizabeth A. Stone,James J. Schauer,Rainer Volkamer,Edward C. Fortner,Edward C. Fortner,B. de Foy,Jian Wang,Alexander Laskin,Vaithiyalingam Shutthanandan,Junsheng Zheng,Renyi Zhang,Jeffrey S. Gaffney,Nancy A. Marley,G. Paredes-Miranda,W. P. Arnott,Luisa T. Molina,G. Sosa,Jose L. Jimenez +31 more
TLDR
In this article, an analysis of high resolution OA spectra was performed at the T0 urban supersite in Mexico City with a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and complementary instrumentation.Abstract:
. Submicron aerosol was analyzed during the MILAGRO field campaign in March 2006 at the T0 urban supersite in Mexico City with a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) and complementary instrumentation. Mass concentrations, diurnal cycles, and size distributions of inorganic and organic species are similar to results from the CENICA supersite in April 2003 with organic aerosol (OA) comprising about half of the fine PM mass. Positive Matrix Factorization (PMF) analysis of the high resolution OA spectra identified three major components: chemically-reduced urban primary emissions (hydrocarbon-like OA, HOA), oxygenated OA (OOA, mostly secondary OA or SOA), and biomass burning OA (BBOA) that correlates with levoglucosan and acetonitrile. BBOA includes several very large plumes from regional fires and likely also some refuse burning. A fourth OA component is a small local nitrogen-containing reduced OA component (LOA) which accounts for 9% of the OA mass but one third of the organic nitrogen, likely as amines. OOA accounts for almost half of the OA on average, consistent with previous observations. OA apportionment results from PMF-AMS are compared to the PM2.5 chemical mass balance of organic molecular markers (CMB-OMM, from GC/MS analysis of filters). Results from both methods are overall consistent. Both assign the major components of OA to primary urban, biomass burning/woodsmoke, and secondary sources at similar magnitudes. The 2006 Mexico City emissions inventory underestimates the urban primary PM2.5 emissions by a factor of ~4, and it is ~16 times lower than afternoon concentrations when secondary species are included. Additionally, the forest fire contribution is at least an order-of-magnitude larger than in the inventory.read more
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Elucidating severe urban haze formation in China
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Interpretation of organic components from Positive Matrix Factorization of aerosol mass spectrometric data
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Organic aerosol components observed in Northern Hemispheric datasets from Aerosol Mass Spectrometry
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TL;DR: In this article, the authors present results from the factor analysis of 43 AMS datasets (27 of the datasets are reanalyzed in this work) and provide a holistic overview of Northern Hemisphere organic aerosol (OA) and its evolution in the atmosphere.
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