Articles | Volume 14, issue 6
https://doi.org/10.5194/amt-14-4689-2021
https://doi.org/10.5194/amt-14-4689-2021
Research article
 | 
24 Jun 2021
Research article |  | 24 Jun 2021

The Adaptable 4A Inversion (5AI): description and first XCO2 retrievals from Orbiting Carbon Observatory-2 (OCO-2) observations

Matthieu Dogniaux, Cyril Crevoisier, Raymond Armante, Virginie Capelle, Thibault Delahaye, Vincent Cassé, Martine De Mazière, Nicholas M. Deutscher, Dietrich G. Feist, Omaira E. Garcia, David W. T. Griffith, Frank Hase, Laura T. Iraci, Rigel Kivi, Isamu Morino, Justus Notholt, David F. Pollard, Coleen M. Roehl, Kei Shiomi, Kimberly Strong, Yao Té, Voltaire A. Velazco, and Thorsten Warneke

Data sets

AERONET Version 3: AOD Level 2.0 J. Stutz, B. Holben, T. Takemura, R. Kivi, V. Aaltonen, F. Ravetta, and J. Pelon https://aeronet.gsfc.nasa.gov/new_web/download_all_v3_aod.html

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Short summary
We present the Adaptable 4A Inversion (5AI), an implementation of the optimal estimation (OE) algorithm, relying on the Automatized Atmospheric Absorption Atlas (4A/OP) radiative transfer model, that enables the retrieval of greenhouse gas atmospheric weighted columns from infrared measurements. It is tested on a sample of Orbiting Carbon Observatory-2 observations, and its results satisfactorily compare to several reference products, thus showing the reliability of 5AI OE implementation.