Statistics – Computation
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.8335l&link_type=abstract
Journal of Geophysical Research, Volume 99, Issue D4, p. 8335-8350
Statistics
Computation
43
Meteorology And Atmospheric Dynamics: Climatology, Meteorology And Atmospheric Dynamics: Radiative Processes, Oceanography: General: Remote Sensing And Electromagnetic Processes, Planetology: Solid Surface Planets: Surface Materials And Properties
Scientific paper
This study proposes a simple parameterization to derive surface broadband albedo from satellite observations, using the results of detailed radiative transfer computations for a variety of atmospheric and surface conditions. The end result is a single equation that directly yields surface albedo from observed albedo at the top of the atmosphere, solar zenith angle, and total precipitable water. It was demonstrated that the parameterization is valid for retrieval of both instantaneous and daily mean surface albedo. Sensitivity tests were conducted for precipitable water, aerosol, CO2, O3, and temperature profile. Preliminary validation using collocated satellite and tower measurements indicates that the absolute accuracy requirement of 5% for climate studies is well satisfied. A global monthly climatology (excluding polar areas) of surface albedo is then developed from 5 years of Earth Radiation Budget Experiment clear-sky satellite data and European Centre for Medium-Range Weather Forecasts humidity analysis data. Examination of month-to-month differences for specific 2.5°×2.5° areas indicate that the absolute random error on monthly estimates is less than 1%. Seasonal variation of surface albedo exceeding 1% can thus be detected. Comparisons with other satellite estimates show much closer agreement than with the values used in some general circulation models and numerical weather prediction models especially over snow/ice and deserts.
Garand Louis
Li Zhanqing
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