Revisiting Earth Radiation Budget from ERBE Wide-Field-of-View Nonscanner

Earth Radiation Budget Experiment (ERBE) wide-field-of-view (WFOV) nonscanner on Earth Radiation Budget Satellite (ERBS) and NOAA-9/NOAA-10 provided broadband shortwave and longwave irradiances from 1985 to 1998. The observations from nonscanner at satellite altitude are converted to TOA flux by inversion processes, which involve applying so-called shape factors. However, the nonscanner processing used only one partly cloudy scene type to determine the shape factor. In addition, it does not consider spectral dependent shortwave filter degradation. Based on knowledge from recent developments in the CERES process, we propose to revise inversion processes for ERBS, NOAA9, and NoAA10 WFOV nonscanners. We will consider spectral dependent degradation of the shortwave filter transmissivity and apply scene type dependent shape factors. In the proposed inversion process, we will use imager derived cloud fraction to identify the scene type over the field of view of nonscanner instruments. In this presentation, we will present proposed inversion processes and some preliminary results.