HR: 0830h
AN: A51E-0723    [PDF]
TI: The influence of the nitrate radical on the dimethylsulfide oxidation derived from field measurements during NEAQS (New England Air Quality Study)
AU: * Stark, H
EM: harald.stark@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: * Stark, H
EM: harald.stark@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Goldan, P D
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Brown, S S
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Brown, S S
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Aldener, M
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Aldener, M
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Kuster, W C
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Williams, E J
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Williams, E J
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Lerner, B M
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Lerner, B M
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: deGouw, J A
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: deGouw, J A
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Warneke, C
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Warneke, C
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Fehsenfeld, F C
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Fehsenfeld, F C
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Ravishankara, A R
AF: NOAA Aeronomy Lab, 325 Broadway R/AL2, Boulder, CO 80305 United States
AU: Ravishankara, A R
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Ravishankara, A R
AF: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309 United States
AB: We present simultaneous measurements of nitrate radical (NO$_{3}$) and dimethylsulfide (DMS) from NEAQS (New England Air Quality Study). DMS is emitted from the ocean surface as a result of phytoplankton activity, whereas NO$_{3}$ is produced by reaction of ozone (O$_{3}$) and nitrogen dioxide (NO$_{2}$) in polluted air. Photolysis by visible light and rapid reaction with NO during daytime prevent NO$_{3}$ from building to significant concentration, except at night. The rapid reaction between NO$_{3}$ and DMS constitutes an important sink for the latter in the polluted marine boundary layer. We will show nocturnal profiles of both compounds as well as the anticorrelations between them. These data indicate that nighttime DMS oxidation by NO$_{3}$ under polluted conditions with high NO$_{3}$ concentrations in the north-east coastal region of the US and daytime oxidation by OH are comparable. We will discuss the influence of transport and mixing of fresh emissions into marine air on the observed anticorrelations based on trajectory calculations and tracer measurements to distinguish between transport effects and reactions.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0312 Air/sea constituent fluxes (3339, 4504)
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