HR: 16:20h
AN: A24C-02    [Abstracts]
TI: Nighttime nitrogen oxide chemistry in the marine boundary layer on board the NOAA research vessel Ronald H. Brown during TexAQS/GoMACCS 2006
AU: * Osthoff, H D
EM: hosthoff@ucalgary.ca
AF: University of Calgary, Department of Chemistry 2500 University Drive NW, Calgary, AB T2N1N4, Canada
AU: * Osthoff, H D
EM: hosthoff@ucalgary.ca
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: * Osthoff, H D
EM: hosthoff@ucalgary.ca
AF: CIRES, 216 UCB University of Colorado, Boulder, CO 80309, United States
AU: Roberts, J M
EM: james.m.roberts@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Bates, T S
EM: Tim.Bates@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way NE, Seattle, WA 98115, United States
AU: Coffman, D
EM: Derek.Coffman@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way NE, Seattle, WA 98115, United States
AU: Quinn, P K
EM: Patricia.K.Quinn@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way NE, Seattle, WA 98115, United States
AU: Williams, E J
EM: eric.j.williams@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Williams, E J
EM: eric.j.williams@noaa.gov
AF: CIRES, 216 UCB University of Colorado, Boulder, CO 80309, United States
AU: Lerner, B M
EM: brian.lerner@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Lerner, B M
EM: brian.lerner@noaa.gov
AF: CIRES, 216 UCB University of Colorado, Boulder, CO 80309, United States
AU: Stark, H
EM: harald.stark@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Stark, H
EM: harald.stark@noaa.gov
AF: CIRES, 216 UCB University of Colorado, Boulder, CO 80309, United States
AU: Sommariva, R
EM: roberto.sommariva@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Sommariva, R
EM: roberto.sommariva@noaa.gov
AF: CIRES, 216 UCB University of Colorado, Boulder, CO 80309, United States
AU: Kuster, W C
EM: william.c.kuster@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Gilman, J
EM: jessica.gilman@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Gilman, J
EM: jessica.gilman@noaa.gov
AF: CIRES, 216 UCB University of Colorado, Boulder, CO 80309, United States
AU: Ravishankara, A R
EM: a.r.ravishankara@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AU: Ravishankara, A R
EM: a.r.ravishankara@noaa.gov
AF: University of Colorado, Department of Chemistry and Biochemistry, Boulder, CO 80309, United States
AU: Brown, S S
EM: steven.s.brown@noaa.gov
AF: NOAA ESRL CSD2, 325 Broadway, Boulder, CO 80305, United States
AB: The nitrate radical, NO₃, formed from reaction of NO₂ with O₃, and dinitrogen pentoxide, N₂O₅, formed from subsequent reaction of NO₃ with NO₂, drive several important nocturnal chemical processes, including oxidation of VOCs (by NO₃) and removal of NO_x (= NO + NO₂) by the heterogeneous reaction of N₂O₅ to form either nitric acid, HNO₃, and/or aerosol nitrate. Laboratory studies have shown that uptake of N₂O₅ on sea salt and chloride containing aerosol produces nitryl chloride, ClNO₂, which after sunrise may provide a source of Cl atoms, an important oxidant of VOCs in the marine boundary layer. We have measured NO₃ and N₂O₅, by cavity ring-down spectroscopy, on board the NOAA research vessel Ronald H. Brown during the Texas Air Quality Study - Gulf of Mexico Atmospheric Composition and Climate Study (TexAQS/GoMACCS) 2006. In this presentation, a few aspects of nighttime nitrogen oxide chemistry in the subtropical marine boundary layer are highlighted, including (1) NO₃ and N₂O₅ production and loss rates including uptake on aerosol in order to estimate nighttime HNO₃ production and NO_x loss, and (2) the impact of NO₃ and N₂O₅ heterogeneous uptake to produce labile halogen containing compounds at night.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting