Abstract
NOAA has produced aerosol optical thickness τ A SAT retrievals from NOAA-11 over oceans operationally since 1990/1/. The upward radiances L (W·m −2·μm −1·sr −1) in AVHRR/Channel 1 (Chl; α=0.63 μm) are converted to τ A SAT using a look-up-table (LUT), pre-calculated for various combinations of illumination-observatio geometries assuming all oceanic and aerosol optical parameters constant but the total aerosol amount /2/. An earlier paper /3/ described the results of τ A SAT validation using a set of sun-photometer (SP) measurements τ A SP from the R/V Adademik Vernadsky during its Cruise in the Atlantic ocean and Mediterranean Sea in Sept–Dec 1989 (AV-89) /4/. That analysis revealed errors in τ A SAT . This paper provides an independent check of that conclusion using the SP measurements taken during another Cruise of the R/V Akademik Vernadsky in Jul–Sept 1991 (AV-91), using the same validation methodology as described in /3/. The results of the two experiments are in agreement.
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