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Status of the implementation of the BPAC

Constant Mazeran(1), Jean-Paul Huot(2), Gerald Moore(3), Ludovic Bourg(1) and Marc Bouvet(2)

(1) ACRI-ST, 260 route du Pin Montard, BP 234, 06904 Sophia Antipolis, France
(2) ESA-ESTEC, Keplerlaan 1, PB 299, NL-2200 AG Noordwijk, Netherlands
(3) Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, United Kingdom

Abstract

The Bright Pixel Atmospheric Correction (BPAC) is the MERIS operational algorithm for precorrecting the residual marine signal in the near infrared prior to the Clear water atmospheric correction. It is an essential step in the mission for computing Level 2 products on Case 2 waters. The method is based on an iterative coupling between a simplified atmospheric correction and a bio-optical model on suspended matter at 709, 775 and 865 nm. We present the status on several issues recently raised on the implementation and validation of the algorithm: a) should the BPAC be activated on Case 1 waters, as it is the case now ? b) How does it behave on very turbid zone like the Amazon plume ? c) What is the gain in switching from band 709 to the less noisy 753 nm ? d) Is the implicit hypothesis of a constant spectral shape correct ? e) What is the coherency between the BPAC output and the atmospheric correction, in particular would a full coupling between the Clear water algorithm and the bio-optical model improve the final water-leaving reflectance in the visible?

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry