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Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) X$_{CO_{2}}$ measurements with TCCON

Wunch, D.; Wennberg, P. O.; Osterman, G.; Fisher, B.; Naylor, B.; Roehl, M. C.; O’Dell, C.; Mandrake, L.; Viatte, C.; Kiel, M.; Griffith, D. W. T.; Deutscher, N. M.; Velazco, V. A.; Notholt, J.; Warneke, T.; Petri, C.; Maziere, M. De; Sha, M. K.; Sussmann, R.; Rettinger, M.; ... mehr

NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry-air mole fraction, X$_{CO_{2}}$, 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 X$_{CO_{2}}$ from OCO-2's primary ground-based validation network: the Total Carbon Column Observing Network (TCCON). The OCO-2 X$_{CO_{2}}$ 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 X$_{CO_{2}}$ data quality throughout its mission.

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.5194/amt-10-2209-2017
ISSN: 1867-1381, 1867-8548
URN: urn:nbn:de:swb:90-715228
KITopen ID: 1000071522
Erschienen in Atmospheric measurement techniques
Band 10
Heft 6
Seiten 2209-2238
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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