HR: 14:10h
AN: A53D-03    [Abstracts]
TI: Large upper tropospheric ozone enhancements above mid-latitude North America during summer: In situ evidence from the IONS and MOZAIC ozone monitoring network
AU: Cooper, O
EM: owen.r.cooper@noaa.gov
AF: CIRES, U. of Colorado, 325 Broadway, Boulder, 80305
AU: Cooper, O
EM: owen.r.cooper@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, 80305
AU: Stohl, A
EM: ast@nilu.no
AF: Norwegian Institute for Air Research, PO Box 100, Kjeller, 2027
AU: * Trainer, M
EM: michael.k.trainer@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, 80305
AU: Thompson, A
EM: amt16@psu.edu
AF: Department of Meteorology, Penn State University, 503 Walker, U. Park, 16802
AU: Witte, J
EM: witte@gavial.gsfc.nasa.gov
AF: Science Systems and Applications, Inc., NASA/GSFC, Greenbelt, 20771
AU: Oltmans, S
EM: Samuel.J.Oltmans@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, 80305
AU: Johnson, B
EM: Bryan.J.Johnson@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, 80305
AU: Merrill, J
EM: jmerrill@gso.uri.edu
AF: Graduate School of Oceanography, U. of RI, Narragansett, 02882
AU: Moody, J
EM: moody@virginia.edu
AF: Dept of Env. Sciences, U. of Virginia, Charlottesville, 22904
AU: Morris, G
EM: Gary.Morris@valpo.edu
AF: Dept. of Physics & Astronomy, Valparaiso University, Valparaiso, 46383
AU: Tarasick, D
EM: david.tarasick@ec.gc.ca
AF: MSC/Environment Canada, 4905 Dufferin Street, Downsview, M3H 5T4
AU: Forbes, G
EM: gforbes@sabletrust.ns.ca
AF: MSC, Sable Island, Nova Scotia, B3J2L4
AU: Nedelec, P
EM: nedp@aero.obs-mip.fr
AF: Laboratoire d'Aerologie, 14 Av. E. Belin, Toulouse, 31400
AU: Fehsenfeld, F
EM: fcf@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, 80305
AU: Meagher, J
EM: jmeagher@al.noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, 80305
AU: Newchurch, M
EM: mike@nsstc.uah.edu
AF: Atmospheric Science Department, U.of Alabama, Huntsville, 35899
AU: Schmidlin, F
EM: fjs@osb.wff.nasa.gov
AF: NASA/Wallops Flight Facility, Code 972, Wallops Island, 23337
AU: Turquety, S
EM: turquety@fas.harvard.edu
AF: Division of Engineering and Applied Sciences Harvard University, Pierce Hall 109, Cambridge, 02138
AU: Crawford, J
EM: j.h.Crawford@larc.nasa.gov
AF: NASA Langley Research Center, 100 NASA Road, Hampton, 23681
AU: Pickering, K
EM: pickerin@atmos.umd.edu
AF: Dept of Meteorology, U. of Maryland, College Park, 20742
AU: Cohen, R
EM: cohen@cchem.berkeley.edu
AF: Dept. of Chemistry, U.of California, Berkeley, 94720
AU: Bertram, T
EM: tbertram@berkeley.edu
AF: Dept. of Chemistry, U.of California, Berkeley, 94720
AU: Wooldridge, P
EM: pjwool@Socrates.berkeley.edu
AF: Dept. of Chemistry, U.of California, Berkeley, 94720
AU: Brune, W
EM: whb2@psu.edu
AF: Department of Meteorology, Penn State University, 503 Walker, U. Park, 16802
AB: During the summer 2004 ICARTT study daily ozonesondes were launched from several sites across the eastern USA and Canada, from California to establish the baseline ozone entering the USA, and from northern Michigan to quantify ozone immediately upwind of the high emission regions in eastern North America. Additional ozone profiles across eastern North America were obtained from five instrumented commercial aircraft. The combined datasets provides the most detailed set of ozone measurements ever gathered across mid-latitude North America. To focus on purely tropospheric ozone the FLEXPART particle dispersion model was used to quantify and remove the stratospheric contribution to all profiles. Lowest ozone values in the upper troposphere were found above the west coast and north of 44 degrees. Higher values were found along the US east coast and the southeast USA with the highest values above Texas. FLEXPART was used to simulate the transport of passive NOx tracers from anthropogenic emissions in North America, intense biomass burning in Alaska and Canada, and from the locations of millions of actual lightning strikes across the continent. The upper tropospheric ozone enhancements were anti-correlated with the anthropogenic and biomass burning tracers (explained variance of 31% and 27%, respectively), but positively correlated with the lightning NOx tracer with an explained variance of 39%. While the correlations are not exceptionally strong they do imply that the excess upper tropospheric ozone above the southern USA is more likely linked to ozone production from lightning NOx rather than NOx emitted from biomass burning or anthropogenic sources
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005