Carbon dioxide retrieval from OCO-2 satellite observations using the RemoTeC algorithm and validation with TCCON measurements
Authors
Wu, L.
Hasekamp, O.
Hu, H.
Landgraf, J.
Butz, A.
Aan de Brugh, J.
Aben, I.
Pollard, D.F.
Griffith, D.W.T.
Feist, D.G.
Koshelev, D.
Hase, F.
Toon, G.C.
Ohyama, H.
Morino, I.
Notholt, J.
Shiomi, K.
Iraci, L.
Schneider, M.
De Mazière, M.
Sussmann, R.
Kivi, R.
Warneke, T.
Goo, T.-Y.
Té, Y.
Discipline
Earth and related Environmental sciences
Audience
Scientific
Date
2018Metadata
Show full item recordDescription
In this study we present the retrieval of the column-averaged dry air mole fraction of carbon dioxide (XCO2) from the Orbiting Carbon Observatory-2 (OCO-2) satellite observations using the RemoTeC algorithm, previously successfully applied to retrieval of greenhouse gas concentration from the Greenhouse Gases Observing Satellite (GOSAT). The XCO2 product has been validated with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON) for almost 2 years of OCO-2 data from September 2014 to July 2016. We found that fitting an additive radiometric offset in all three spectral bands of OCO-2 significantly improved the retrieval. Based on a small correlation of the XCO2 error over land with goodness of fit, we applied an a posteriori bias correction to our OCO-2 retrievals. In overpass averaged results, XCO2 retrievals have an SD of ∼ 1.30 ppm and a station-to-station variability of ∼ 0.40 ppm among collocated TCCON sites. The seasonal relative accuracy (SRA) has a value of 0.52 ppm. The validation shows relatively larger difference with TCCON over high-latitude areas and some specific regions like Japan.
Citation
Wu, L.; Hasekamp, O.; Hu, H.; Landgraf, J.; Butz, A.; Aan de Brugh, J.; Aben, I.; Pollard, D.F.; Griffith, D.W.T.; Feist, D.G.; Koshelev, D.; Hase, F.; Toon, G.C.; Ohyama, H.; Morino, I.; Notholt, J.; Shiomi, K.; Iraci, L.; Schneider, M.; De Mazière, M.; Sussmann, R.; Kivi, R.; Warneke, T.; Goo, T.-Y.; Té, Y. (2018). Carbon dioxide retrieval from OCO-2 satellite observations using the RemoTeC algorithm and validation with TCCON measurements. , Atmospheric Measurement Techniques, Vol. 11, Issue 5, 3111-3130, DOI: 10.5194/amt-11-3111-2018.Identifiers
Type
Article
Peer-Review
Yes
Language
eng