Aerosol Analysis with the High Resolution Time-of-Flight Aerosol Mass Spectrometer at the Urban SuperSite (T0) in Mexico City during MILAGRO

HR: 1340h
AN: A23C-1467 [Abstracts]
TI: Aerosol Analysis with the High Resolution Time-of-Flight Aerosol Mass Spectrometer at the Urban SuperSite (T0) in Mexico City during MILAGRO
AU: * Aiken, A C
EM: allison.aiken@colorado.edu
AF: Dept. of Chemistry, University of Colorado, 215 UCB, Boulder, CO 80309, United States
AU: * Aiken, A C
EM: allison.aiken@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AU: Salcedo, D
EM: dara@ciq.uaem.mx
AF: Centro de Investigaciones Quimicas, U. Autonoma del Estado de Morelos, Cuernavaca, 62209, Mexico
AU: Huffman, J A
EM: alex.huffman@colorado.edu
AF: Dept. of Chemistry, University of Colorado, 215 UCB, Boulder, CO 80309, United States
AU: Huffman, J A
EM: alex.huffman@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AU: Ulbrich, I
EM: ingrid.ulbrich@colorado.edu
AF: Dept. of Chemistry, University of Colorado, 215 UCB, Boulder, CO 80309, United States
AU: Ulbrich, I
EM: ingrid.ulbrich@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AU: DeCarlo, P F
EM: peter.decarlo@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AU: DeCarlo, P F
EM: peter.decarlo@colorado.edu
AF: ATOC, CU-Boulder, 311 UCB, Boulder, CO 80309, United States
AU: Cubison, M
EM: michael.cubison@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AU: Docherty, K
EM: kenneth.docherty@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AU: Sueper, D
EM: donna.sueper@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AU: Sueper, D
EM: donna.sueper@colorado.edu
AF: Aerodyne Research, 45 Manning Rd., Billerica, MA 01821, United States
AU: Worsnop, D R
EM: worsnop@aerodyne.com
AF: Aerodyne Research, 45 Manning Rd., Billerica, MA 01821, United States
AU: Trimborn, A
EM: trimborn@aerodyne.com
AF: Aerodyne Research, 45 Manning Rd., Billerica, MA 01821, United States
AU: Northway, M
EM: mnorthway@aerodyne.com
AF: Aerodyne Research, 45 Manning Rd., Billerica, MA 01821, United States
AU: Prevot, A
EM: andre.prevot@psi.ch
AF: Paul Scherrer Institut, 5232 Villigen, PSI, 0000, Switzerland
AU: Szidat, S
EM: soenke.szidat@iac.unibe.ch
AF: Paul Scherrer Institut, 5232 Villigen, PSI, 0000, Switzerland
AU: Szidat, S
EM: soenke.szidat@iac.unibe.ch
AF: U. of Bern, 3012, Bern, 0000, Switzerland
AU: Wehrli, M N
AF: U. of Bern, 3012, Bern, 0000, Switzerland
AU: Wiedinmyer, C
EM: christin@ucar.edu
AF: NCAR, P.O. Box 3000, Boulder, CO 80307, United States
AU: Wang, J
EM: jian@bnl.gov
AF: BNL, P.O. Box 5000, Upton, NY 11973, United States
AU: Zheng, J
EM: junzheng@ariel.met.tamu.edu
AF: Texas A&M, 3150 TAMU, College Station, TX 77843, United States
AU: Fortner, E
EM: edfornter@tamu.edu
AF: Texas A&M, 3150 TAMU, College Station, TX 77843, United States
AU: Zhang, R
EM: zhang@ariel.met.tamu.edu
AF: Texas A&M, 3150 TAMU, College Station, TX 77843, United States
AU: Gaffney, J S
EM: jsgaffney@ualr.edu
AF: U. Arkansas, 2801 S. University Avenue, Little Rock, AR 72204, United States
AU: Marley, N A
EM: namarley@ualr.edu
AF: U. Arkansas, 2801 S. University Avenue, Little Rock, AR 72204, United States
AU: Sosa Iglesias, G E
EM: gsosa@imp.mx
AF: IMP, Eje Central Norte Lazaro Cardenas 152, Mexico City, D.F 07730, Mexico
AU: Jimenez, J L
EM: jose.jimenez@colorado.edu
AF: Dept. of Chemistry, University of Colorado, 215 UCB, Boulder, CO 80309, United States
AU: Jimenez, J L
EM: jose.jimenez@colorado.edu
AF: CIRES, CU-Boulder, 216 UCB, Boulder, CO 80309, United States
AB: Non-refractory submicron (approx. PM1) ambient aerosol was analyzed from March 10 - 30, 2006 in Mexico City at the T0 (IMP) urban supersite with the High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS, DeCarlo et al., 2006). The HR-ToF-AMS can resolve the elemental composition of most mass fragments, especially for the low m/z (below 100) where the majority of the signal occurs in the AMS when using electron ionization (EI). Mass concentrations and size distributions of inorganic species (Ammonium, Chloride, Nitrate, Sulfate) are similar to results from MCMA-2003 (Salcedo et al., 2006). Positive Matrix Factorization (PMF) analysis of the Organic mass indicates that primary emissions and urban SOA formation are important for this dataset, while the impact of large biomass burning plumes is more episodic and correlates with satellite fire counts. A regional highly oxygenated organic aerosol is also observed. C-14 filter analysis results are generally consistent with the PMF results. Organic amines are detected in the aerosol during some mornings. Lead is also detected and correlates well with measurements from other techniques. The chemically-resolved aerosol volatility is characterized using a thermal denuder in front of the AMS. A new organic elemental analysis technique developed by our group is also applied to the organic aerosol (Aiken et al., 2007) to determine the oxygen-to-carbon (O/C) and organic mass to organic carbon (OM/OC) ratios.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 3300 ATMOSPHERIC PROCESSES
DE: 3311 Clouds and aerosols
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting