Heidelberg 2015 – wissenschaftliches Programm
UP 4.1: Poster
Mittwoch, 25. März 2015, 10:45–19:45, G/Foyer
Tropical tropospheric ozone from satellite observations with the Convective Clouds Differential technique — •Elpida Leventidou, Kai-Uwe Eichmann, Mark Weber, and John Burrows — Institute of Environmental Physics, Bremen, Germany
Ozone influences most of the chemical reactions in the Troposphere. Its tropospheric abundance can be retrieved using space-borne observations of vertically integrated ozone and cloud heights. The Convective Clouds Differential (CCD) technique takes advantage of the frequent occurrence of convective clouds in the western Pacific region by subtracting above-cloud ozone of this region from clear-sky ozone elsewhere to derive global monthly mean tropospheric amount. An important assumption is that the above-cloud ozone in the western Pacific simulates the stratospheric ozone and that the stratospheric ozone field is invariant with longitude; which is approximately true in the tropics. A CCD algorithm has been developed and is applied to optical remote sensing observations from three satellite instruments, so that a unique long-term record of monthly averaged tropical (20S, 20N) tropospheric vertically integrated ozone (1995-2012) is created. First results of the CCD technique, including validation by comparisons with ozone data from ozonesondes, will be presented.