HR: 11:20h
AN: A22A-05    [Abstracts]
TI: Aircraft Observations of NO3 and N2O5 During NEAQS/ICARTT 2004
AU: * Brown, S S
EM: steven.s.brown@noaa.gov
AF: NOAA Aeronomy Lab, R/AL2, 325 Broadway, Boulder, CO 80305 United States
AU: * Brown, S S
EM: steven.s.brown@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Dube, W P
EM: william.p.dube@noaa.gov
AF: NOAA Aeronomy Lab, R/AL2, 325 Broadway, Boulder, CO 80305 United States
AU: Dube, W P
EM: william.p.dube@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Osthoff, H
EM: Hans.Osthoff@noaa.gov
AF: NOAA Aeronomy Lab, R/AL2, 325 Broadway, Boulder, CO 80305 United States
AU: Osthoff, H
EM: Hans.Osthoff@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Ravishankara, A R
EM: ravi@al.noaa.gov
AF: NOAA Aeronomy Lab, R/AL2, 325 Broadway, Boulder, CO 80305 United States
AU: Ravishankara, A R
EM: ravi@al.noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80309 United States
AU: Ravishankara, A R
EM: ravi@al.noaa.gov
AF: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309 United States
AB: We report the first observation of NO3 and N2O5 from an aircraft platform. The measurements were taken on the NOAA WP-3 during the ICARTT campaign in the summer of 2004. Preliminary scientific findings include the following. Concentrations of NO3 and N2O5 were often enhanced aloft relative to those made at the surface. In recently emitted NOx plumes of urban origin, for example, NO3 and N2O5 occurred at concentrations as large at 400 pptv and 3 ppbv, respectively, and in some cases constituted a significant fraction of nocturnal NOy. In other cases, rapid degradation of both compounds was observed, particularly in the presence of sulfate aerosol. Vertical profiles showed clear differences in the nocturnal nitrogen oxide chemistry between the surface layer and the free troposphere. The presentation will discuss the implications of these observations for nocturnal budgets of NOx and O3, as well as nocturnal VOC oxidation and aerosol processing.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0322 Constituent sources and sinks
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