Computation of averaged monthly zonal albedo utilizing the solar zenith angle, properties of clear and cloudy atmospheres

Details Computation of averaged monthly zonal albedo utilizing the solar zenith angle, properties of clear and cloudy atmospheres Computation of averaged monthly zonal albedo utilizing the solar zenith angle, properties of clear and cloudy atmospheres

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8212010d&link_type=abstract

Unknown

Statistics

Computation

Albedo, Cloud Cover, Computation, Mathematical Models, Solar Position, Solar Radiation, Zenith, Angles (Geometry), Computer Programs, Latitude, Optical Thickness, Solar Atmosphere

Scientific paper

The zonal temporal averages of albedos at the top of the atmosphere were considered as a function of the length of the day. The length of the day were used to determine the average daily values of mu0(=Cos of the solar zenith angle, theta0). Polynominal fits of the slope and intercept functions of As (cloud-free albedo) and Ac(cloud albedo) as function of Cos theta0 were obtained by using the sample values of albedo corresponding to solar zenith angles from 0 to 90 deg with interval of 5 deg. The daily zonal values of mu0 and the surface albedos were used to compute the daily zonal values of albedos at the top of the clear and cloudy atmosphere. The monthly zonal cloud fractions were used to compute planetary albedo A at the top of the atmosphere. The global values of monthly albedos As, Ac and A were computed by using the weighting function defined as the difference of the sins of zonal values of latitudes. The computer program implementation is also described.

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