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

Poyraz, Deniz; Dewitte, Steven; Vannerom, David

doi:10.5194/egusphere-2026-4782

Preprints

https://doi.org/10.5194/egusphere-2026-4782

Preprints

15 Sep 2026

| 15 Sep 2026

Status: this preprint is open for discussion and under review for Earth Observation (EO).

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

Deniz Poyraz, Steven Dewitte, and David Vannerom

Abstract. 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.

Received: 07 Aug 2026 – Discussion started: 15 Sep 2026

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Deniz Poyraz, Steven Dewitte, and David Vannerom

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Deniz Poyraz, Steven Dewitte, and David Vannerom

Data sets

GOES-16/18 ABI Level 1b Radiances GOES-R Calibration Working Group and GOES-R Series Program (2017) https://doi.org/10.7289/V5BV7DSR

GOES ABI Level 2 Clear Sky Mask GOES-R Algorithm Working Group and GOES-R Series Program https://doi.org/10.7289/V5SF2TGP

GOES ABI Level 2 Cloud Top Phase GOES-R Algorithm Working Group and GOES-R Series Program https://doi.org/10.7289/V5NP22QW

MODIS/Terra+Aqua Land Cover Type Yearly L3 Global 0.05Deg CMG (MCD12C1, V061) M. Friedl and D. Sulla-Menashe https://doi.org/10.5067/MODIS/MCD12C1.061

Model code and software

Reflected Solar Radiation Narrow Band Radiance to Broadband Flux Conversion for Earth Climate Observatory Phase-0 Study Deniz Poyraz https://doi.org/10.5281/zenodo.21157781

Deniz Poyraz, Steven Dewitte, and David Vannerom

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Latest update: 15 Sep 2026

Short summary

We present data processing algorithms converting reflected solar narrowband radiances to broadband fluxes for the Earth Explorer 12 candidate Earth Climate Observatory (ECO). We derived channel-specific anisotropy factors and narrowband-to-broadband coefficients using GOES ABI proxy data, applied to convert narrowband fluxes into broadband flux. Algorithm performance is assessed by comparing GOES East-West flux in their overlap region, the first step of the Phase-0 ECO study.