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Ability of the 4-D-Var analysis of the GOSAT BESD XCO₂ retrievals to characterize atmospheric CO₂ at large and synoptic scales

Massart, S.; Agusti-Panareda, A.; Heymann, J.; Buchwitz, M.; Chevallier, F.; Reuter, M.; Hilker, M.; Burrows, J.P.; Deutscher, N.M.; Feist, D.G.; Hase, F.; Sussmann, R.; Desmet, F.; Dubey, M.K.; Griffith, D.W.T.; Kivi, R.; Petri, C.; Schneider, M.; Velazco, V.A.

Abstract. This study presents results from the European Centre for Medium-Range Weather Forecasts (ECMWF) carbon dioxide (CO2) analysis system where the atmospheric CO2 is controlled through the assimilation of column-averaged dry-air mole fractions of CO2 (XCO2) from the Greenhouse gases Observing Satellite (GOSAT). The analysis is compared to a free-run simulation (without assimilation of XCO2), and they are both evaluated against XCO2 data from the Total Carbon Column Observing Network (TCCON). We show that the assimilation of the GOSAT XCO2 product from the Bremen Optimal Estimation Differential Optical Absorption Spectroscopy (BESD) algorithm during the year 2013 provides XCO2 fields with an improved mean absolute error of 0.6 parts per million (ppm) and an improved station-to-station bias deviation of 0.7  ppm compared to the free run (1.1 and 1.4  ppm, respectively) and an improved estimated precision of 1  ppm compared to the GOSAT BESD data (3.3  ppm). We also show that the analysis has skill for synoptic situations in the vicinity of frontal systems, where the GOSAT retrievals are sparse due to cloud contamination. We fina ... mehr

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 2016
Sprache Englisch
Identifikator DOI: 10.5194/acp-16-1653-2016
ISSN: 1680-7316
URN: urn:nbn:de:swb:90-531650
KITopen ID: 1000053165
HGF-Programm 12.03.01; LK 01
Erschienen in Atmospheric Chemistry and Physics
Band 16
Heft 3
Seiten 1653-1671
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