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A detailed profile of the photosynthetic parameters and the action spectra was obtained in the Sargasso Sea during late summer, when the upper water column was strongly stratified. Significant depth variation in their magnitudes was present in the lower part of the euphotic zone. The consequences of such vertical structure on the estimation of water column primary production by remote sensing on ocean colour are evaluate by sensitivity analysis using a spectral irradiance model. The errors in estimated primary production at depth assuming constant values of the photosynthetic parameters can be of several fold. However, for estimated of daily water-column primary production the errors are generally less than 10%. The results are presented and discussed.

Additional information

Authors: ULLOA O, University of Copenhagen, Niels Bohr Institute of Astronomy, Physics and Geophysics (DK);HOEPFFNER N, JRC Ispra (IT);LARKIN D, DJL Software Consultancy Ltd, Jarrow (GB)
Bibliographic Reference: Paper presented: Ocean Optics XIII, Halifax (CA), October 22-25, 1996
Availability: Available from (1) as Paper EN 40540 ORA
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