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Processes Affecting Tropospheric Ozone Inferred from Ozonesonde and Other Tracer Data from the R/V R H Brown Atlantic Cruise (37N-34S) in January-February 1999During the Aerosols-99 trans-Atlantic cruise from Norfolk, VA, to Cape Town, South Africa, 22 ozonesondes were launched from the NOAA R/V R H Brown between 17 Jan and 6 Feb 1999, with all sondes but one reaching 30 km. A composite of ozone profiles along the transect shows high free tropospheric ozone (up to 100 ppbv at 9 km) between 5N and 20S, a coherent feature straddling either side of the ITCZ. Latitudinal variations of tropospheric ozone are interpreted using correlative measurements of surface ozone, CO, water vapor, and aerosol optical thickness (column absorbance) measured from the ship. Elevated ozone in the lower troposphere results from photochemical reactions of precursors emitted by biomass burning north of the ITCZ. However, the greatest ozone mixing ratios are in the mid-troposphere south of the ITCZ, which gives evidence of interhemispheric transport. Column-integrated tropospheric ozone, 35 DU from 0-16 km, agrees with that derived from the TOMS satellite by the modified-residual method [Thompson and Hudson, 1999]. NCEP wind fields, ship-launched radiosondes and back trajectories are consistent with a picture of recirculating air parcels centered in the tropical Atlantic region which is identified with the maximum wave-one amplitude in total ozone seen in sondes and by satellite.
Document ID
20000013620
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Thompson, Anne M.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Doddridge, B. G.
(Maryland Univ. College Park, MD United States)
Luke, W. T.
(National Oceanic and Atmospheric Administration Silver Spring, MD United States)
Johnson, J. E.
(Washington Univ. Seattle, WA United States)
Witte, J. C.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Reynolds, R. M.
(Brookhaven National Lab. Upton, NY United States)
Johnson, B.
(National Oceanic and Atmospheric Administration Boulder, CO United States)
Oltmans, S. J.
(National Oceanic and Atmospheric Administration Boulder, CO United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Environment Pollution
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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