Computation
Derivation of the ESA GHG CCI column averaged carbon dioxide from OCO-2 generated with the FOCAL algorithm
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Abstract
Column-averaged carbon dioxide (XCO2) has been retrieved using the FOCAL-OCO2 algorithm, by analysing hyper spectral solar backscattered radiance measurements from NASA's Orbiting Carbon Observatory 2 (OCO-2) satellite. FOCAL includes a radiative transfer model which has been developed to approximate light scattering effects by multiple scattering at an optically thin scattering layer. This reduces the computational costs by several orders of magnitude. FOCAL's radiative transfer model is utilised to simulate the radiance in all three OCO-2 spectral bands allowing the simultaneous retrieval of CO2, H2O, and solar induced chlorophyll fluorescence. The product is limited to cloud-free scenes on the Earth's day side.
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