A Simple Method for Estimating Monthly Mean Albedo of Land Surfaces From AVHRR Data.

Details A Simple Method for Estimating Monthly Mean Albedo of Land Surfaces From AVHRR Data. A Simple Method for Estimating Monthly Mean Albedo of Land Surfaces From AVHRR Data.

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988japme..27..973g&link_type=abstract

Journal of Applied Meteorology, vol. 27, Issue 9, pp.973-988

Mathematics

Logic

11

Scientific paper

It is suggested that the observed periodicity of cloud-free, visible and near-infrared data from the Advanced Very High Resolution Radiometer (AVHRR) onboard NOAA-9 for a particular target can be efficiently used for deriving the monthly mean clear-sky planetary albedo. The broadband albedo is approximated by a linear combination of visible and near-infrared albedos. The new method of 9-day compositing distributes the clear-sky observations over the sun-target-sensor geometry combinations and weights them by the occurrence of each combination during a particular month. It is shown that the monthly mean clear-sky planetary albedo can be estimated solely from the visible and near-infrared data in a model-independent manner. The surface albedo is then obtained by applying a simple atmospheric correction to the derived clear-sky planetary albedo.A comparison of the results of the present method and those obtained by using the `minimum albedo' method indicates that the latter may lead to an underestimation of monthly values because of the angular variation in clear-sky observed albedos. The derived surface albedos are compared with those reported in climatological studies based on ground observations.

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