Southern Hemisphere Additional Ozonesondes (SHADOZ) 1998–2000 tropical ozone climatology 1. Comparison with Total Ozone Mapping Spectrometer (TOMS) and ground-based measurements

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Read Full Article (file size: 1194560 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D2, 8238, doi:10.1029/2001JD000967, 2003 Southern Hemisphere Additional Ozonesondes (SHADOZ) 1998–2000 tropical ozone climatology 1. Comparison with Total Ozone Mapping Spectrometer (TOMS) and ground-based measurements Anne M. Thompson NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Jacquelyn C. Witte NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Richard D. McPeters NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Samuel J. Oltmans NOAA Climate Monitoring and Diagnostics Laboratory, Boulder, Colorado, USA Francis J. Schmidlin NASA Wallops Flight Facility, Wallops Island, Virginia, USA Jennifer A. Logan Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts, USA Masatomo Fujiwara Radio Science Center for Space and Atmosphere, Kyoto University, Kyoto, Japan Volker W. J. H. Kirchhoff INPE Laboratorio Ozonio, São José dos Campos, Brazil Françoise Posny Université de la Réunion, St.-Denis, Réunion, France Gert J. R. Coetzee South African Weather Service, Pretoria, South Africa Bruno Hoegger Swiss Aerological Observatory, Payerne, Switzerland Shuji Kawakami NASDA Earth Observations Research Center, Tokyo, Japan Toshihiro Ogawa NASDA Earth Observations Research Center, Tokyo, Japan Bryan J. Johnson NOAA Climate Monitoring and Diagnostics Laboratory, Boulder, Colorado, USA Holger Vömel NOAA Climate Monitoring and Diagnostics Laboratory, Boulder, Colorado, USA Gordon Labow NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Abstract A network of 10 southern hemisphere tropical and subtropical stations, designated the Southern Hemisphere Additional Ozonesondes (SHADOZ) project and established from operational sites, provided over 1000 ozone profiles during the period 1998–2000. Balloon-borne electrochemical concentration cell (ECC) ozonesondes, combined with standard radiosondes for pressure, temperature, and relative humidity measurements, collected profiles in the troposphere and lower to midstratosphere at: Ascension Island; Nairobi, Kenya; Irene, South Africa; Réunion Island; Watukosek, Java; Fiji; Tahiti; American Samoa; San Cristóbal, Galapagos; and Natal, Brazil. The archived data are available at: 〈 http://croc.gsfc.nasa.gov/shadoz〉. In this paper, uncertainties and accuracies within the SHADOZ ozone data set are evaluated by analyzing: (1) imprecisions in profiles and in methods of extrapolating ozone above balloon burst; (2) comparisons of column-integrated total ozone from sondes with total ozone from the Earth-Probe/Total Ozone Mapping Spectrometer (TOMS) satellite and ground-based instruments; and (3) possible biases from station to station due to variations in ozonesonde characteristics. The key results are the following: (1) Ozonesonde precision is 5%. (2) Integrated total ozone column amounts from the sondes are usually to within 5% of independent measurements from ground-based instruments at five SHADOZ sites and overpass measurements from the TOMS satellite (version 7 data). (3) Systematic variations in TOMS-sonde offsets and in ground-based-sonde offsets from station to station reflect biases in sonde technique as well as in satellite retrieval. Discrepancies are present in both stratospheric and tropospheric ozone. (4) There is evidence for a zonal wave-one pattern in total and tropospheric ozone, but not in stratospheric ozone. Published 30 January 2003. Index Terms: 0394 Atmospheric Composition and Structure: Instruments and techniques; 3309 Meteorology and Atmospheric Dynamics: Climatology (1620); 9305 Information Related to Geographic Region: Africa; 9325 Information Related to Geographic Region: Atlantic Ocean; 9340 Information Related to Geographic Region: Indian Ocean; 9355 Information Related to Geographic Region: Pacific Ocean; 3394 Meteorology and Atmospheric Dynamics: Instruments and techniques; 1640 Global Change: Remote sensing. Read Full Article (file size: 1194560 bytes) Cited by Citation: Thompson, A. M., et al. (2003), Southern Hemisphere Additional Ozonesondes (SHADOZ) 1998–2000 tropical ozone climatology 1. Comparison with Total Ozone Mapping Spectrometer (TOMS) and ground-based measurements, J. Geophys. Res., 108(D2), 8238, doi:10.1029/2001JD000967. Copyright 2003 by the American Geophysical Union.

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