Relation between photosynthetically available radiation and total insolation at the ocean surface under clear skies’ Abstract-A radiative transfer model is used to investigate the relationship between photo-synthetically available radiation, E&O+) and to-tal incoming solar radiation, &JO+) at the ocean surface. The ratio of EP,,(O+) to E&O+) lies be-tween 0.42 and 0.50 for most clear sky condi-tions. The simulations indicate that the param-eters governing the variability ofZ&,(O+) : E&O+) are the solar zenith angle, the amount of water vapor in the atmosphere, and the aerosol optical thickness. The influence of ozone and other gas-eous constituents is insignificant. Comparisons between model results and field data show close agreement. Given the solar zenith angle and an estimate of both the total water vapor amount and the aerosol optical thickness, E&O+) can be accurately predicted from E,,,(O+) for studies of aquatic photosynthesis. The availability of sunlight in the upper layers of the oceans is fundamental to the process upon which marine life depends, namely photosynthesis. The amount of sun-light present for photosynthesis, otherwise known as photosynthetically available ra-diation, E,,,(W m-2), is defined b
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