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

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…

• NS
  National Science Foundation

  Awards: 0511803, 0511769, 0528227, CAREER, 0449815
• UD
  U.S. Department of Energy

  Awards: FG02-05ER63981, DE-FG02-, FG02-05ER64008, DE-FG02
• NA
  National Aeronautics and Space Administration

  Awards: NNG05GQ50H, NNG04GR06H
• NO
  National Oceanic and Atmospheric Administration
• PN
  Pacific Northwest National Laboratory