Abstract
This paper describes an extension of conventional multichannel s.s.t. algorithms for NOAA-7 AVHRR/2 data to include data from the Meteosat-2 IR1 (11 μm) channel, generally viewing through a different zenith angle. This provides a combination of multichannel and dual-angle techniques for determining the atmospheric correction. These algorithms, derived statistically from the results of transmission calculations on a number of temperature/humidity profiles, were tested under ‘pseudo-operational’ conditions against ship measurements of s.s.t., and the results compared with the AVHRR-only algorithms of other workers. The conclusion is that the technique is feasible but, due to the uncertainties in the Meteosat radiances caused by residual cloud contamination, the additional data are given only a low weight in the algorithms and the influence on retrieved s.s.t. is small. There were also opportunities to test the Rutherford-Appleton Laboratory transmission model used in deriving the algorithms, and the results suggest that the model underestimates the absorption by the water vapour continuum in the 11 μm window.
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