HR: 10:35h
AN: A41F-02    [PDF]
TI: Non-Refractory Submicron Aerosol Mass Loadings during NEAQS
AU: * Middlebrook, A M
EM: amiddlebrook@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Matthew, B M
EM: bmatthew@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Matthew, B M
EM: bmatthew@al.noaa.gov
AF: University of Colorado, CIRES, Boulder, CO 80309 United States
AU: Canagaratna, M R
EM: mrcana@aerodyne.com
AF: Aerodyne Research Inc, 45 Manning Rd, Billerica, MA 01821 United States
AU: Worsnop, D R
EM: worsnop@aerodyne.com
AF: Aerodyne Research Inc, 45 Manning Rd, Billerica, MA 01821 United States
AU: Quinn, P K
EM: patricia.k.quinn@noaa.gov
AF: NOAA Pacific Marine Environmental Laboratory, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AU: DeGouw, J A
EM: jdegouw@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: DeGouw, J A
EM: jdegouw@al.noaa.gov
AF: University of Colorado, CIRES, Boulder, CO 80309 United States
AU: Warneke, C
EM: cwarneke@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Warneke, C
EM: cwarneke@al.noaa.gov
AF: University of Colorado, CIRES, Boulder, CO 80309 United States
AU: Goldan, P D
EM: pgoldan@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Kuster, W C
EM: bkuster@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Williams, E J
EM: ewilliams@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: McKeen, S A
EM: smckeen@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AB: During the New England Air Quality Study (NEAQS) in July-August 2002, an Aerosol Mass Spectrometer (AMS) was deployed aboard the NOAA ship RONALD H. BROWN and collected 2-minute averaged data. The AMS, which measures non-refractory components of aerosol particles with aerodynamic diameters between roughly 40 and 1500 nm, produced particle mass spectra as well as aerosol organic, sulfate, ammonium, and nitrate mass distributions. A wide variety of air masses were sampled, including clean marine, clean continental, and polluted continental air masses. In general, the volatile particle composition was mostly organic and sulfate with lesser amounts of ammonium and nitrate and the mass loadings typically peaked around 400-600 nm in vacuum aerodynamic diameter. Although the AMS sulfate and ammonium concentrations were highly correlated with the sulfate and ammonium concentrations from the Particle into Liquid (PILS) instrument also deployed on the ship, the AMS and PILS nitrate concentrations were not correlated and at times anti-correlated. In contrast, the AMS nitrate and organic concentrations as well as the AMS nitrate and gas phase alkyl nitrate concentrations were highly correlated. These results suggest that organic nitrate was present in the submicron aerosol phase. The AMS organic concentrations were generally higher than the AMS sulfate concentrations, consistent with other shipboard measurements. Whenever the sulfate concentration increased, the organic concentration also increased, indicating that sulfate and organic aerosol growth are influenced by the same processes or that sulfate may play a role in organic aerosol growth. The exception to this pattern occurred during a sea fog event where the sulfate concentration increased and the organic concentration decreased, probably due to rapid aqueous phase sulfur oxidation and relatively less oxidation of organic compounds. Furthermore, the organic concentration often increased without concurrent increases in sulfate mass, indicating that organic and sulfate aerosol mass have different sources or that the processes involved in increasing organic concentrations can be independent of sulfur oxidation.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting