1 September 1990 Examination of the use of narrowband radiances for earth radiation budget studies
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Abstract
The relationship between narrowband and broadband thermal radiances is explored to detennine the accuracy of outgoing longwave radiation derived from narrowband data Infrared window (1 1. 5 jim) thta from the Geostationary Operational Environmental Satellite (GOES) are correlated with longwave (5. 0 -50. 0j. tm) data from the Earth Radiation Budget Experiment (ERBE). A simple quadratic fit between the narrowband and longwave fluxes results in a standard error of the estimate of 4. 5-5. 3 for data which are matched closely in time and space. Use of matched regional flux data with temporal differences up to a half hour yield standard errors of4. 6-5. 9. About one fourth of the magnitude of the error may be atiributed to limb-darkening and temporal differences in the matched fluxes. The relationship shows a significant dependence on the relative humidity of the atmosphere above the radiating surface. Although this dependency accounts for only about 2 of the standard error it reduces the monthly mean regional errors by more than 10. Data taken over land produced a slightly different relationship than data taken over water. The differences appear to be due to the higher altitudes of the land radiating surfaces. Cloud amount and height also influence the narrowband-broadband relationship. Inclusion of these parameters does not affect the standard errors but it reduces the monthly mean regional errors by another 10. Better humidity and temperature data and
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David W. Young, David W. Young, David R. Doelling, David R. Doelling, Patrick Minnis, Patrick Minnis, Edwin F. Harrison, Edwin F. Harrison, } "Examination of the use of narrowband radiances for earth radiation budget studies", Proc. SPIE 1299, Long-Term Monitoring of the Earth's Radiation Budget, (1 September 1990); doi: 10.1117/12.21381; https://doi.org/10.1117/12.21381
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