Horizontal radiative fluxes in clouds and accuracy of the Independent Pixel Approximation at absorbing wavelengths

Details Horizontal radiative fluxes in clouds and accuracy of the Independent Pixel Approximation at absorbing wavelengths Horizontal radiative fluxes in clouds and accuracy of the Independent Pixel Approximation at absorbing wavelengths

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1585m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 11, p. 1585-1588

Physics

9

Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Theoretical Modeling, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

For absorbing wavelengths, we discuss the effect of horizontal solar radiative fluxes in clouds on the accuracy of a conventional plane-parallel radiative transfer calculation for a single pixel, known as the Independent Pixel Approximation (IPA). Vertically integrated horizontal fluxes can be represented as a sum of three components: the IPA accuracies for reflectance, transmittance and absorptance. We show that IPA accuracy for reflectance always improves with more absorption, while the IPA accuracy for transmittance is less sensitive to the changes in absorption: with respect to the non-absorbing case, it may first deteriorate for weak absorption and then improve again for strongly absorbing wavelengths. IPA accuracy for absorptance always deteriorates with more absorption.

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