Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 5 2009 10.5194/bg-6-751-2009 http://www.biogeosciences.net/6/751/2009/ http://www.biogeosciences.net/6/751/2009/bg-6-751-2009.html http://www.biogeosciences.net/6/751/2009/bg-6-751-2009.pdf 751 764 2009-05-06 Quantitative observation of cyanobacteria and diatoms from space using PhytoDOAS on SCIAMACHY data A. Bracher astrid.bracher@awi.de M. Vountas T. Dinter J. P. Burrows R. Röttgers I. Peeken Alfred-Wegener-Institute for Polar and Marine Research, Bussestr. 24, 27570 Bremerhaven, Germany Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany currently at: Centre for Ecology and Hydrology Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford, Oxfordshire, OX10 8BB, UK Institute of Coastal Research, GKSS Research Center Geesthacht, Max-Planck.Strasse 1, 21502 Geesthacht, Germany MARUM – Center for Marine Environmental Sciences, Bremen, Germany In this study the technique of Differential Optical Absorption Spectroscopy (DOAS) has been adapted for the retrieval of the absorption and biomass of two major phytoplankton groups (PhytoDOAS) from data of the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) satellite sensor. SCIAMACHY measures back scattered solar radiation in the UV-Vis-NIR spectral regions with a high spectral resolution (0.2 to 1.5 nm). In order to identify phytoplankton absorption characteristics in the SCIAMACHY data in the range of 430 to 500 nm, phytoplankton absorption spectra measured in-situ during two different RV "Polarstern" expeditions were used. The two spectra have been measured in different ocean regions where different phytoplankton groups (cyanobacteria and diatoms) dominated the phytoplankton composition. Results clearly show distinct absorption characteristics of the two phytoplankton groups in the SCIAMACHY spectra. Using these results in addition to calculations of the light penetration depth derived from DOAS retrievals of the inelastic scattering (developed by Vountas et al., 2007), globally distributed pigment concentrations for these characteristic phytoplankton groups for two monthly periods (February–March 2004 and October–November 2005) were determined. 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