HR: 16:00h
AN: A54C-01    [Abstracts]
TI: Reactive Nitrogen Distribution and Budgets in the North American Troposphere and Lowermost Stratosphere
AU: * Singh, H B
EM: Hanwant.B.Singh@nasa.gov
AF: NASA Ames Research Center, Mail Stop 245-5, Moffett Field, CA 94035 United States
AU: Czech, E
EM: eczech@mail.arc.nasa.gov
AF: NASA Ames Research Center, Mail Stop 245-5, Moffett Field, CA 94035 United States
AU: Avery, M
EM: m.a.avery@larc.nasa.gov
AF: NASA Langley Research Center, Atmospheric Sciences, Hampton, VA 23681 United States
AU: Crawford, J
EM: James.H.Crawford@nasa.gov
AF: NASA Langley Research Center, Atmospheric Sciences, Hampton, VA 23681 United States
AU: Sachse, G
EM: g.w.sachse@larc.nasa.gov
AF: NASA Langley Research Center, Atmospheric Sciences, Hampton, VA 23681 United States
AU: Blake, D
EM: dblake@orion.oac.uci.edu
AF: UC Irvine, Chemistry Department, Irvine, CA 92697 United States
AU: Cohen, R
EM: rccohen@berkeley.edu
AF: UC Berkeley, Chemistry Department, Berkeley, CA 94720 United States
AU: Dibb, J
EM: jack.dibb@unh.edu
AF: U. of New Hampshire, Morse Hall, Durham, NH 03824 United States
AU: Huey, G
EM: greg.huey@eas.gatech.edu
AF: Georgia Tech, School of Earth Sciences, Atlanta, GA 30332 United States
AU: Jacob, D
EM: djj@io.harvard.edu
AF: Harvard University, Dept of Earth and Planetary Sciences, Cambridge, MA 02138 United States
AU: Hudman, R
EM: hudman@fas.harvard.edu
AF: Harvard University, Dept of Earth and Planetary Sciences, Cambridge, MA 02138 United States
AU: Emmons, L
EM: emmons@ucar.edu
AF: NCAR, ACD, Boulder, CO 80307 United States
AU: Horowitz, L
EM: Larry.Horowitz@noaa.gov
AF: NCAR, ACD, Boulder, CO 80307 United States
AU: Carmichael, G
EM: gcarmich@engineering.uiowa.edu
AF: University of Iowa, Dept. of Engineering, Iowa City, IA 52242 United States
AB: A comprehensive group of reactive nitrogen species (PANs, HNO3, NO, NO2, HNO4, alkyl nitrates, and aerosol-NO3) were measured in the troposphere and lowermost stratosphere over North America and the Atlantic during July/August 2004 (INTEX-A) from the NASA DC-8 platform (0.1-12 km). Less reactive nitrogen species (HCN and CH3CN), that are also unique tracers of biomass combustion, were also measured along with a host of gaseous (CO, VOC, OVOC, halocarbon) and aerosol tracers. Clean background air as well as air with influences from biogenic emissions, anthropogenic pollution, biomass combustion, and stratosphere were sampled both over land and water (Atlantic and Pacific). The North America upper troposphere was found to be greatly contaminated by continental surface pollution lofted via convection and transported on intercontinental scales. As a result, PAN and ozone were found to be greatly elevated over much of the North American middle and upper troposphere. Plumes from Alaskan fires contained large amounts of PAN and very little enhancement in ozone. Lightning appeared to be a far greater contributor to NOx than previously believed. A first comparison of observed data with 3-D model simulations shows significant differences between observations and models as well as among models. There are indications of soil sinks of nitriles (e. g. HCN) that need further quantification. We investigate the partitioning and interplay of the reactive nitrogen species within characteristic air masses and further examine their role in ozone formation.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
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