. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 00 Fig. 1. Comparison between ES (steplike curve), ASl (solid circles), and AS2 (open circles) upward radiances at the top of the atmosphere for an ocean with wo = and phase function KC and an atmosphere with a normal (1 X N), three times normal (3 X A/), and ten times normal (10 X N) aerosol concentration. angle between the nadir and the direction toward which the sensor is viewing. The radiances in Fig. 1 for the ES cases are accurate to about
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 00 Fig. 1. Comparison between ES (steplike curve), ASl (solid circles), and AS2 (open circles) upward radiances at the top of the atmosphere for an ocean with wo = and phase function KC and an atmosphere with a normal (1 X N), three times normal (3 X A/), and ten times normal (10 X N) aerosol concentration. angle between the nadir and the direction toward which the sensor is viewing. The radiances in Fig. 1 for the ES cases are accurate to about 3% in the ^ = 1 to about range, while for the AS cases the accuracy is about 1%. It is seen that again, to within the accuracy of the com- putations, the three simulations agree for all the aerosol concentrations except within the ft = 0 to about range, , viewing near the horizon. It is felt that these computations demonstrate that the transfer of the ocean color spectrum through the atmosphere can be studied with either the ASl or AS2 model as long as radiances close to the horizon are not of interest. Furthermore, from the reciprocity principle,16 the nadir radiance, when the solar beam makes an angle An with the zenith, can be found by multiplying the radiance /(m) in Fig. 1 by n where n is taken to be cosflo- This implies that as long as the sun is not too near the hori- zon, the ASl and AS2 methods of computation can be used to determine the nadir radiance at the top of the atmosphere as a function of the ocean's properties through Eq. (2). The fact that the AS2 model (homo- geneous atmosphere) yields accurate radiances is very important in remote sensing since it implies that only the total concentration (or equivalently the total optical thickness) of the aerosol need be determined to recover the ocean color spectrum from satellite spectral radio- metric data. In principle, as suggested by Curran,1' this can be accomplished by observing the ocean (assumed fr
Size: 1386px × 1802px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionamericana, bookleafnumber87, books
