Time and Spectral Dependent Degradation Correction for ERBE WFOV Shortwave Nonscanner Instruments and Revisiting its Radiation Observations (1985 to 1998)
Abstract
ERBE (Earth Radiation Budget Experiment) wide-field-of-view (WFOV) nonscanner instruments onboard ERBS (Earth Radiation Budget Satellite) and NOAA satellites measured broadband Earth's reflected shortwave (SW) and outgoing longwave (LW) irradiance to provide Earth Radiation budget dataset from 1985 to 1998. However, an earlier study with these datasets suggested that there exists a trend in the day-minus-night longwave irradiance due in part to the assumption of the gray correction implemented to account for the degradation of the dome transmissivity of the shortwave instruments. Although, a correction factor is available for this problem, it only works over tropical regions. In addition, recent analysis from the CERES (Clouds and the Earth's Radiant Energy System) project indicates that transmissivity degradations vary with wavelength within the instrument's bandwidth and are not uniform as assumed with the gray corrections. Thus, a time and spectral dependent degradation correction approach is implemented to reprocess the ERBS WFOV SW nonscanner observations. This approach uses the solar data observed by these instruments during calibration days in addition to surface type and cloud properties. This poster explains the reprocessing approach and discusses these results by comparing it to the existing ERBE radiation dataset. It also discusses the limitation in calibrating ERBS nonscanner by treating the spectral dependence of the dome transmission.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMGC31D1143S
- Keywords:
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- 3339 Ocean/atmosphere interactions;
- ATMOSPHERIC PROCESSESDE: 3360 Remote sensing;
- ATMOSPHERIC PROCESSESDE: 1620 Climate dynamics;
- GLOBAL CHANGEDE: 1635 Oceans;
- GLOBAL CHANGE