Concentrations, Time Variations, Size Distributions, and Mass Spectra of Primary and Oxygenated Organic Aerosols at Multiple Urban, Rural, and Remote Locations

HR: 13:40h
AN: A53E-01 INVITED [Abstracts]
TI: Concentrations, Time Variations, Size Distributions, and Mass Spectra of Primary and Oxygenated Organic Aerosols at Multiple Urban, Rural, and Remote Locations
AU: * Jimenez, J L
EM: jose.jimenez@colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309 United States
AU: Zhang, Q
EM: zhangq@cires.colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309 United States
AU: Dzepina, K
EM: katja.dzepina@colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309 United States
AU: Dunlea, E
EM: edward.dunlea@colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309 United States
AU: Huffman, J A
EM: alex.huffman@colorado.edu
AF: University of Colorado, UCB 216, Boulder, CO 80309 United States
AU: Worsnop, D R
EM: worsnop@aerodyne.com
AF: Aerodyne Research, Inc., 45 Manning Rd., Billerica, MA 08201 United States
AU: Canagaratna, M R
EM: mrcana@aerodyne.com
AF: Aerodyne Research, Inc., 45 Manning Rd., Billerica, MA 08201 United States
AU: Onasch, T
EM: onasch@aerodyne.com
AF: Aerodyne Research, Inc., 45 Manning Rd., Billerica, MA 08201 United States
AU: Boudries, H
EM: hboudries@aerodyne.com
AF: Aerodyne Research, Inc., 45 Manning Rd., Billerica, MA 08201 United States
AU: Jayne, J T
EM: jayne@aerodyne.com
AF: Aerodyne Research, Inc., 45 Manning Rd., Billerica, MA 08201 United States
AU: Alfarra, R
EM: Rami.Alfarra@umist.ac.uk
AF: The University of Manchester, PO Box 88, Manchester, M60 1QD United Kingdom
AU: Allan, J
EM: james.allan@physics.org
AF: The University of Manchester, PO Box 88, Manchester, M60 1QD United Kingdom
AU: Coe, H
EM: Hugh.Coe@umist.ac.uk
AF: The University of Manchester, PO Box 88, Manchester, M60 1QD United Kingdom
AU: Bower, K
EM: K.Bower@umist.ac.uk
AF: The University of Manchester, PO Box 88, Manchester, M60 1QD United Kingdom
AU: Drewnick, F
EM: drewnick@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Joh.-Joachim-Becher-Weg 27 , Mainz, 55128 Germany
AU: Weimer, S
EM: weimer@asrc.cestm.albany.edu
AF: SUNY-Albany, 251 Fuller Rd, Albany, NY 12203 United States
AU: Demerjian, K
EM: kld@asrc.cestm.albany.edu
AF: SUNY-Albany, 251 Fuller Rd, Albany, NY 12203 United States
AB: We have recently developed a new procedure to estimate the mass concentrations and size distributions, and extract the mass spectra (MS) of primary and oxygenated organic aerosols (POA and OOA respectively) based on custom principal component analysis of Aerodyne AMS data (Zhang et al., this conference). Good correlation between AMS organic mass concentrations and OC from Thermal-Optical measurements has been observed at several locations (e.g. r2 = 0.88 in Pittsburgh). POA and OOA account for almost all the organic aerosol mass at most locations. OOA may comprise secondary organic aerosol (SOA) and also products of the oxidation of primary aerosol. In this presentation we will compare the mass concentrations and fractions, time variations, extracted MS, and size distributions, of POA and OOA in various urban, rural, and remote locations throughout the world. Urban locations include Pittsburgh, Mexico City, New York City, Houston, Boulder, Manchester and Edinburgh, UK, and Vancouver, Canada. Rural and remote locations include Storm Peak (Colorado), Duke Forest (North Carolina), Nova Scotia (Canada), Jungfraujoch (Switzerland), Trinidad Head (California), Jeju Island (Korea), Mace Head (Ireland), and Hyyti„l„ (Finland). Primary aerosols represent a significant fraction of the organic aerosol in cities, although OOA is often larger, especially in the summer. Freshly-emitted combustion POA appear as a distinct mode at small vacuum aerodynamic diameters at all urban locations due to their fractal morphology, which is confirmed by "chase" AMS sampling behind individual vehicles. POA diurnal profiles are to a first order determined by the interplay of emissions and boundary layer height. OOA is generally concentrated in the accumulation mode, even in cities, indicating that most SOA condensation occurs on regional rather than urban scales. At times OOA may appear in the ultrafine mode, likely due to condensation on traffic particles or on growing nucleation particles. Organic aerosols at rural and remote locations are almost always dominated by OOA. There is evidence for additional components at some locations. The MS and size distributions of primary and oxygenated aerosols extracted with this procedure at various locations will be compared. The diurnal profiles and size distributions of OOA suggest that at least a significant fraction of this component is SOA, which is often internally mixed with ammonium sulfate. The extracted spectra of primary aerosols in urban areas are remarkably similar to that of directly sampled vehicle exhaust, while that of OOA is qualitatively similar across locations, and also shows similarity with the spectra of fulvic acid- a humic-like substance that has been previously used as an analogue to represent polyacid components found in highly processed and oxidized atmospheric organic aerosols.
UR: http://cires.colorado.edu/jimenez/ams.html
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting