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Sub-satellite measurements of the ocean color: Validation of the SeaWiFS satellite scanner data



Sub-satellite measurements of the ocean color: Validation of the SeaWiFS satellite scanner data



Okeanologiya 40(3): 357-362



Validation of the atmospheric correction and bio-optical algorithms of the SeaWiFS satellite scanner has been performed by means of the direct comparison between the satellite and in situ data obtained in the scientific cruise of R/V "Akvanavt" in the Black and Aegean seas in October 1997. At first, we checked whether the radiance values at the top of the atmosphere measured by SeaWiFS sensor and calculated by Monte Carlo technique from the data of field observations were in agreement. Then the SeaWiFS atmospheric correction algorithm was verified by comparing the values of the normalized radiance from the water surface and aerosol optical thickness derived from the SeaWiFS data and field measurements in situ. An analytical algorithm was proposed by the authors for the determination of the chlorophyll concentration along with the standard SeaWiFS algorithm. The comparison of results obtained using both of the algorithms with the values measured in situ shows that the algorithm suggested by the authors is in a reasonable agreement in all cases studied, whereas the SeaWiFS algorithm can lead to a significant overestimation of the chlorophyll concentration for the waters with predominance of absorption by the yellow substance.

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