A method for the in-flight spectral calibration of the oxygen A-band channel of MERIS is presented. This calibration is based on measurements of the atmospheric transmission in the oxygen A-band, using the relation between oxygen transmission and surface pressure. The accuracy of the method has been estimated by using radiative transfer calculations for realistic atmospheric conditions, assuming spectral shifts on the MERIS response. When the calibration is applied over bright surfaces, the expected accuracy of the spectral shift determination is about - 0.01 nm.
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Dubuisson et al. (2003) studied this question.