HR: 14:20h
AN: A43F-03    [Abstracts]
TI: Nighttime nitrogen oxide chemistry in the marine boundary layer as observed on board the NOAA research vessel Ronald H. Brown during NEAQS-ITCT 2004
AU: * Osthoff, H D
EM: hosthoff@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: * Osthoff, H D
EM: hosthoff@al.noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Brown, S S
EM: steven.s.brown@noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Williams, E J
EM: eric.j.williams@noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Williams, E J
EM: eric.j.williams@noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Lerner, B M
EM: blerner@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Lerner, B M
EM: blerner@al.noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Kuster, W
A43F-03 AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Kuster, W
A43F-03 AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Goldan, P
EM: pgoldan@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Goldan, P
EM: pgoldan@al.noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Bates, T S
EM: tim.bates@noaa.gov
AF: NOAA Pacific Marine Environment Laboratory, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AU: Coffmann, D
A43F-03 AF: NOAA Pacific Marine Environment Laboratory, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AU: Johnson, J E
EM: james.e.johnson@noaa.gov
AF: NOAA Pacific Marine Environment Laboratory, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AU: Sommariva, R
EM: roberto.sommariva@noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Sommariva, R
EM: roberto.sommariva@noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Pettersson, A
EM: anders.pettersson@foi.se
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Pettersson, A
EM: anders.pettersson@foi.se
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Baynard, T
EM: tbaynard@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Baynard, T
EM: tbaynard@al.noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Dube, W P
EM: bdube@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Dube, W P
EM: bdube@al.noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Ravishankara, A R
EM: ravi@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL 2 325 Broadway, Boulder, CO 80305 United States
AU: Ravishankara, A R
EM: ravi@al.noaa.gov
AF: CIRES, 216 UCB, Boulder, CO 80309 United States
AU: Ravishankara, A R
EM: ravi@al.noaa.gov
AF: University of Colorado, Department of Chemistry and Biochemistry, Boulder, CO 80309 United States
AB: Nitrogen oxides play key roles in regional air quality, for example through the catalytic photochemical production of O₃ involving NO_x (=NO+NO₂). At night, a large fraction of NO_x is converted to the nitrate radical, NO₃, which is formed by reaction of NO₂ with O₃, and dinitrogen pentoxide, N₂O₅, which is formed via addition of NO₂ to NO₃. The formation of NO₃ and N₂O₅ is effectively suppressed during the day by NO₃ photolysis and reaction with NO. The nocturnal nitrogen oxides drive several important chemical processes. NO₃ has been identified as a primary nighttime oxidant, for example of VOCs such as terpenes and isoprene. Hydrolysis of N₂O₅ on particles and surfaces is believed to be a major nighttime NO_x loss mechanism. We have measured NO₃, N₂O₅, and NO₂ by cavity ring-down spectroscopy on board the NOAA research vessel Ronald H. Brown during the New England Air Quality Study (NEAQS-ITCT) 2004. In this presentation, we highlight a few aspects of the following nighttime nitrogen oxide chemistry in the marine boundary layer off the coast of New England: (1) NO₃ and N₂O₅ production and loss rates including uptake on aerosol and fog in order to estimate nighttime HNO₃ production and NO_x loss, (2) the impact of NO₃ and N₂O₅ uptake on sea salt to produce labile halogen containing compounds at night, (3) the impact of OH and NO₃ oxidation on VOCs such as dimethyl sulfide (DMS) and terrestrially emitted biogenic compounds, and (4) the consistency of DMS lifetimes with observed levels of NO₃.
DE: 0322 Constituent sources and sinks
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: Fall Meeting 2005