HR: 17:00h
AN: A44C-04 [Abstracts]
TI: Evidence for a recurring eastern North America upper tropospheric ozone maximum during summer
AU: * Cooper, O R
EM: owen.r.cooper@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, 325
Broadway CSD04, Boulder, 80305, United States
AU: * Cooper, O R
EM: owen.r.cooper@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Trainer, M
EM: Michael.K.Trainer@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Thompson, A
EM: amt16@psu.edu
AF: Department of Meteorology, Pennsylvania State University, 0503 WALKER BLDG, University
Park, 16802, United States
AU: Oltmans, S J
EM: Samuel.J.Oltmans@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Tarasick, D W
EM: david.tarasick@ec.gc.ca
AF: Experimental Studies Research Division, MSC/Environment Canada, 4905 Dufferin Street,
Downsview, M3H 5T4, Canada
AU: Witte, J
EM: witte@gavial.gsfc.nasa.gov
AF: Science Systems and Applications, Inc., NASA Goddard Space Flight Center
916, Greenbelt, 0771, United States
AU: Stohl, A
EM: ast@nilu.no
AF: Norwegian Institute for Air Research, P.O. Box 100, Kjeller, N-2027, Norway
AU: Eckhardt, S
EM: sec@nilu.no
AF: Norwegian Institute for Air Research, P.O. Box 100, Kjeller, N-2027, Norway
AU: Lelieveld, J
EM: lelieveld@mpch-mainz.mpg.de
AF: Max Plank Institute for Chemistry, P.O.Box 3060, Mainz, D-55128, Germany
AU: Portmann, R
EM: Robert.W.Portmann@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Johnson, B
EM: Bryan.Johnson@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Kalnajs, L
AF: University of Colorado, 1234 Innovation Dr, Boulder, 80309, United States
AU: Newchurch, M
EM: mike@nsstc.uah.edu
AF: Atmospheric Science Department, University of Alabama in Huntsville, University of
Alabama in Huntsville, Huntsville, 35899, United States
AU: Dubey, M
EM: dubey@lanl.gov
AF: Los Alamos National Laboratory, Mail Stop D462, Los Alamos, 87545, United States
AU: Meagher, J
EM: James.F.Meagher@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Leblanc, T
EM: leblanc@tmf.jpl.nasa.gov
AF: Table Mountain Facility, Jet Propulsion Laboratory, Table Mountain Observatory
24490 Table Mountain Rd, Wrightwood, 92397-0367, United States
AU: McDermid, I S
EM: mcdermid@tmf.jpl.nasa.gov
AF: Table Mountain Facility, Jet Propulsion Laboratory, Table Mountain Observatory
24490 Table Mountain Rd, Wrightwood, 92397-0367, United States
AU: Forbes, G
EM: Gerry.Forbes@ec.gc.ca
AF: Meteorological Service of Canada, Environment Canada - Sable Sable Island
45 Alderney Drive, Dartmouth, B2Y 2N6, Canada
AU: Carey-Smith, T
EM: tcareysm@uwo.ca
AF: Environment Canada/National Institute of Water and Atmospheric Research Ltd, Private
Bag 14901, Kilbirnie, Wellington, 14901,
AU: Wolfe, D
EM: Daniel.Wolfe@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Fehsenfeld, F
EM: Fred.C.Fehsenfeld@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, 80305, United States
AU: Morris, G
EM: Gary.Morris@valpo.edu
AF: Department of Physics & Astronomy, Valparaiso University, Valparaiso University,
Valparaiso, 46383, United States
AU: Lefer, B
EM: blefer@uh.edu
AF: Geosciences Department, University of Houston, University of Houston, Houston, 77204-
5007, United States
AU: Rappenglück, B
EM: brappenglueck@uh.edu
AF: Geosciences Department, University of Houston, University of Houston, Houston, 77204-
5007, United States
AU: Keating, T
EM: keating.terry@epa.gov
AF: United States Environmental Protection Agency, 1200 Pennsylvania Ave. NW, Washington
DC, 20460, United States
AU: Joseph, E
EM: ejoseph@howard.edu
AF: Department of Physics and Astronomy, Howard University, 2400 Sixth Street, NW,
Washington DC, 20059, United States
AU: Minschwaner, K
EM: krm@kestrel.nmt.edu
AF: Department of Physics, New Mexico Institute of Mining and Technology, New Mexico
Institute of Mining and Technology, Socorro, 87801, United States
AU: Schmidlin, F
EM: fjs@osb.wff.nasa.gov
AF: NASA/GSFC/Wallops Flight Facility, Code 972
NASA/GSFC/Wallops Flight Facility, Wallops Island, 23337, United States
AU: VanCuren, R
EM: rvancure@arb.ca.gov
AF: California Air Resources Board, 1001 I St, Sacramento, 95812, United States
AB:
Daily ozonesondes were launched from 14 N. American sites during August 2006, providing the best set of free
tropospheric ozone measurements ever gathered across the continent in a single season. The data reveal that
the strongest regional-scale ozone enhancement is not in the lower troposphere, but in the upper troposphere
above eastern North America, and centered over the southeastern USA. Recurring each year, the location and
strength of the ozone maximum is influenced by the summertime upper tropospheric anticyclone that traps
convectively lofted ozone and ozone precursors from anthropogenic sources, as well as ozone produced from
lightning NOx, above the southeastern USA. The North American summer monsoon that flows northwards along
the Rocky Mountains is embedded within the western side of the anticyclone and also marks the westernmost
extent of the ozone maximum. Removing the influence from stratospheric intrusions, median ozone mixing ratios
(78 ppbv) in the upper troposphere (> 6 km) above Alabama, near the center of the anticyclone, were nearly twice
the level above the US west coast. Model simulations indicate lightning NOx emissions led to the production of
25-30 ppbv of ozone at 250 hPa above the southern USA during the study period.
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting