Berlin 2012 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Atmosphere 1

UP 2.7: Vortrag

Dienstag, 27. März 2012, 11:45–12:00, HFT-FT 131

Tropospheric ozone column retrieval from SCIAMACHY limb-nadir-matching observations — •Felix Ebojie, Christian Savigny, Annette Ladstätter-Weissenmayer, Mark Weber, Stefan Bötel, Rozanov Alexei, Heinrich Bovensmann, and John Burrows — Institute of Environmental Physics (IUP), University of Bremen, P.O. Box 330440, D-28334 Bremen, Germany

Tropospheric ozone is a pollutant, a constituent of smog and its strong oxidizing ability leads to the formation of many toxic oxides. Ozone also acts as a greenhouse gas, with highest efficiency in the upper troposphere and lower stratosphere. This study presents the retrieval of tropospheric column ozone (TCO) from the limb-nadir matching observations of the Scanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) onboard Envisat. This retrieval technique involves the subtraction of the stratospheric column ozone (SCO) derived from the limb observations from the total ozone columns (TOC) derived from the nadir observations. Equally of importance in our analysis is the TCO derived from the ozonesondes by integrating the tropospheric ozone profiles from the bottom to the top of the troposphere, which was determined from the sonde temperature profile measurements using the WMO lapse rate criterion definition of the thermal tropopause. Our retrievals are compared with retrievals from ozonesondes and other satellites instruments, with results showing good agreements with some slight deviations of about 5-10 DU. Finally, some possible sources of error in our analysis are discussed.