Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) X<sub>CO2</sub> measurements with TCCON - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Atmospheric Measurement Techniques Année : 2017

Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) XCO2 measurements with TCCON

Coleen Roehl
Camille Viatte
  • Fonction : Auteur
  • PersonId : 1023298
Voltaire Velazco
Justus Notholt
Christof Petri
Kimberly Strong
Rigel Kivi
Laura Iraci

Résumé

NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry-air mole fraction, XCO2, in the Earth's atmosphere for over 2 years. In this paper, we describe the comparisons between the first major release of the OCO-2 retrieval algorithm (B7r) and XCO2 from OCO-2's primary ground-based validation network: the Total Carbon Column Observing Network (TCCON). The OCO-2 XCO2 retrievals, after filtering and bias correction, agree well when aggregated around and coincident with TCCON data in nadir, glint, and target observation modes, with absolute median differences less than 0.4 ppm and RMS differences less than 1.5 ppm. After bias correction, residual biases remain. These biases appear to depend on latitude, surface properties, and scattering by aerosols. It is thus crucial to continue measurement comparisons with TCCON to monitor and evaluate the OCO-2 XCO2 data quality throughout its mission.
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hal-02174630 , version 1 (15-01-2021)

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Paternité - Pas d'utilisation commerciale

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Debra Wunch, Paul Wennberg, Gregory Osterman, Brendan Fisher, Bret Naylor, et al.. Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) XCO2 measurements with TCCON. Atmospheric Measurement Techniques, 2017, 10 (6), pp.2209-2238. ⟨10.5194/amt-10-2209-2017⟩. ⟨hal-02174630⟩
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