HR: 0800h
AN: A51C-0069    [Abstracts]
TI: Vertical Profiles in NO3 and N2O5
AU: * Brown, S S
EM: steven.s.brown@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305 United States
AU: Osthoff, H D
EM: hans.d.osthoff@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305 United States
AU: Osthoff, H D
EM: hans.d.osthoff@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80305 United States
AU: Dube, W P
EM: william.p.dube@noaa.gov
AF: NOAA Aeronomy Lab, 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 80305 United States
AU: Ryerson, T B
EM: thomas.b.ryerson@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305 United States
AU: de Gouw, J A
EM: joost.degouw@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305 United States
AU: de Gouw, J A
EM: joost.degouw@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80305 United States
AU: Warneke, C
EM: carsten.warneke@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305 United States
AU: Warneke, C
EM: carsten.warneke@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80305 United States
AU: Stutz, J
EM: jochen@atmos.ucla.edu
AF: Department of Oceanic and Atmospheric Sciences, University of California Los Angeles, Los Angeles, CA 90095
AU: Fehsenfeld, F C
EM: fred.fehsenfeld@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305 United States
AU: Ravishankara, A R
EM: a.r.ravishankara@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305 United States
AU: Ravishankara, A R
EM: a.r.ravishankara@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO 80305 United States
AU: Ravishankara, A R
EM: a.r.ravishankara@noaa.gov
AF: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80305 United States
AB: The nocturnal formation and subsequent reactions of NO3 (the nitrate radical) and N2O5 (dinitrogen pentoxide) are an important component of atmospheric nitrogen oxide chemistry. However, relatively little is known about their spatial distribution and variability, mainly because in-situ instruments for measurement of their ambient concentrations have only recently become available. This presentation will show the vertical distributions of NO3 and N2O5 (and related compounds) from two recent field campaigns; measurements from the NOAA P3 aircraft over the Northeast United States and the North Atlantic during the summer of 2004, and from a tower site near Boulder, CO in the fall of 2004. The aircraft data show vertical distributions from 0-3.5 km, while those from the tower site cover the range from 0-300 m with high vertical resolution (< 1 m). A common feature in both data sets is the large increase in NO3 and N2O5 mixing ratios measured aloft compared those at the surface, even in the absence of similar vertical variations in NOx and ozone. While there are varying reasons for these gradients, it is clear that nocturnal nitrogen oxide chemistry aloft leads to different evolution of NOx and VOC than that at the surface, an observation that will influence the understanding of the lifetime, transport and distribution of atmospheric NOx.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005