EGUsphere

Copernicus Publications

Göttingen, Germany

10.5194/egusphere-2026-4782

Reflected Solar Radiation Narrow Band Radiance to Broadband Flux Conversion for Earth Climate Observatory Phase-0 Study

Poyraz

Deniz

https://orcid.org/0000-0002-2692-5621

¹ Dewitte

Steven

¹ Vannerom

David

https://orcid.org/0000-0002-2747-5095

¹ ²

Royal Observatory of Belgium, Avenue Circulaire 3, 1180 Brussels, Belgium

Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium

15 09 2026

2026 1 37

2026

This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/

This article is available from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-4782/

The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-4782/egusphere-2026-4782.pdf

We present how reflected shortwave radiation (RSR) fluxes are derived from narrowband radiances within the Earth Climate Observatory (ECO) Phase-0 study. The processing chain consists of two main steps: (i) Angular Distribution Models (ADMs) that convert angular-dependent narrowband radiances into angular-independent narrowband fluxes, (ii) a spectral Narrowband-to-Broadband (NB2BB) conversion model that converts narrowband fluxes into broadband fluxes. The NB2BB coefficients are derived from radiative transfer simulations, while the ADMs are obtained from proxy data provided by the ABI instruments on the GOES-East and GOES-West satellites. We assess the framework by applying the full chain to this proxy dataset, starting from ABI narrowband radiances and deriving broadband RSR fluxes. The uncertainty associated to the procedure is evaluated by comparing the fluxes retrieved from GOES-East and GOES-West within their overlap region. In addition to the daily instantaneous retrievals, monthly-mean RSR fluxes are also derived.

European Space Agency

4000146017/24/NL/IB/ab