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The PhytoDOAS technique to retrieve phytoplankton groups from hyperspectral satellite data.

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Bracher, A. , Sadeghi, A. , Dinter, T. , Taylor, B. , Vountas, M. , Röttgers, R. and Peeken, I. (2011): The PhytoDOAS technique to retrieve phytoplankton groups from hyperspectral satellite data. , Satellite PFT Algorithm Intercomparison Workshop, Hokkaido University, Sapporo, Japan .
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The PhytoDOAS algorithm by Bracher et al. (2009), modified by and Sadeghi et al. (2011), enables the concurrent retrieval of global chl-a of phytoplankton groups (diatoms, cyanobacteria, coccolithophores, dinoflagellates) from hyperspectral satellite data, such as measured by SCIAMACHY onboard ENVISAT. For applying the Differential Optical Absorption Spectroscopy (DOAS) fit from 430-530nm the following absorbers are considered in the analysis: atmosphere: O3, O4, NO2, H2Og, Glyoxal, Ring; ocean: inelastic scattering, water, PFTs; The non-differentisl absorption and scattering is approximated with low order polynomial. The global data set of the four phytoplankton groups is avaiable on a monthly resolution for July 2002 until today.

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