Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 22 2007 10.5194/acp-7-5917-2007 http://www.atmos-chem-phys.net/7/5917/2007/ http://www.atmos-chem-phys.net/7/5917/2007/acp-7-5917-2007.html http://www.atmos-chem-phys.net/7/5917/2007/acp-7-5917-2007.pdf 5917 5936 2007-11-29 A UT/LS ozone climatology of the nineteen seventies deduced from the GASP aircraft measurement program C. Schnadt Poberaj christina.schnadt@env.ethz.ch J. Staehelin D. Brunner V. Thouret V. Mohnen Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland Laboratory for Air Pollution/Environmental Technology, Empa, Dübendorf, Switzerland Laboratoire d'Aérologie, UMR 5560, Université Paul Sabatier, Toulouse, France Atmospheric Sciences Research Center, State University of New York at Albany, Albany, New York, USA We present ozone measurements of the Global Atmospheric Sampling Program (GASP) performed from four commercial and one research aircraft in the late 1970s. The GASP quality assurance and control program was reviewed, and an ozone climatology of the upper troposphere and lower stratosphere (UT/LS) of the years 1975–1979 was built. The data set was estimated to have an overall uncertainty of 9% or 3 ppb whichever is greater for the first two years and 4% or 3 ppb for the remaining years, i.e. after implementation of silicone rubber membranes in the pumps. Two cases of nearly coincident flights of two GASP airliners along the same flight route, and the comparison with independent observations from the literature, including ozonesondes and aircraft campaigns, indicate that the ozone measurements are of high quality. The UT/LS climatology of the GASP data set is in general agreement with that derived from MOZAIC in the 1990s in regions covered by both programmes. GASP provides unique large-scale climatological information on UT/LS ozone above the northern hemisphere Pacific region, which is not covered by MOZAIC. 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