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The ACOS CO 2 retrieval algorithm – Part 1: Description and validation against synthetic observations
Open accessAbstract
Abstract. This work describes the NASA Atmospheric CO2 Observations from Space (ACOS) XCO2 retrieval algorithm, and its performance on highly realistic, simulated observations. These tests, restricted to observations over land, are used to evaluate retrieval errors in the face of realistic clouds and aerosols, polarized non-Lambertian surfaces, imperfect meteorology, and uncorrelated instrument noise. We find that post-retrieval filters are essential to eliminate the poorest retrievals, which arise primarily due to imperfect cloud screening. The remaining retrievals have RMS errors of approximately 1 ppm. Modeled instrument noise, based on the Greenhouse Gases Observing SATellite (GOSAT) in-flight performance, accounts for less than half the total error in these retrievals. A small fraction of unfiltered clouds, particularly thin cirrus, lead to a small positive bias of ~0.3 ppm. Overall, systematic errors due to imperfect characterization of clouds and aerosols dominate the error budget, while errors due to other simplifying assumptions, in particular those related to the prior meteorological fields, appear small.
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The HITRAN2016 molecular spectroscopic database
Gordon, I. E., Rothman, L. S., Hill, C., Kochanov, R. V., Tan, Y., Bernath, P. F., Birk, M., Boudon, V., Campargue, A., Chance, K. V., et al. (2017) · Journal of Quantitative Spectroscopy and Radiative Transfer · doi:10.1016/j.jqsrt.2017.06.038 · Cited by 7,721
Self-citationClimate–Carbon Cycle Feedback Analysis: Results from the C4MIP Model Intercomparison
Friedlingstein, P., Cox, P., Betts, R., Bopp, L., von Bloh, W., Brovkin, V., Cadule, P., Doney, S., Eby, M., Fung, I., et al. (2006) · Journal of Climate · doi:10.1175/jcli3800.1 · Cited by 2,902
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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, C. M., O'Dell, C., Mandrake, L., Viatte, C., Kiel, M., et al. (2017) · Atmospheric Measurement Techniques · doi:10.5194/amt-10-2209-2017 · Cited by 477
Self-citationProspects for chlorophyll fluorescence remote sensing from the Orbiting Carbon Observatory-2
Frankenberg, C., O'Dell, C., Berry, J., Guanter, L., Joiner, J., Köhler, P., Pollock, R., & Taylor, T. E. (2014) · Remote Sensing of Environment · doi:10.1016/j.rse.2014.02.007 · Cited by 473
Self-citationO'Dell, C. W., Eldering, A., Wennberg, P. O., Crisp, D., Gunson, M. R., Fisher, B., Frankenberg, C., Kiel, M., Lindqvist, H., Mandrake, L., et al. (2018) · Atmospheric Measurement Techniques · doi:10.5194/amt-11-6539-2018 · Cited by 434
Self-citationA method for evaluating bias in global measurements of CO 2 total columns from space
Wunch, D., Wennberg, P. O., Toon, G. C., Connor, B. J., Fisher, B., Osterman, G. B., Frankenberg, C., Mandrake, L., O'Dell, C., Ahonen, P., et al. (2011) · Atmospheric Chemistry and Physics · doi:10.5194/acp-11-12317-2011 · Cited by 314
Self-citationThe Orbiting Carbon Observatory-2 early science investigations of regional carbon dioxide fluxes
Eldering, A., Wennberg, P. O., Crisp, D., Schimel, D. S., Gunson, M. R., Chatterjee, A., Liu, J., Schwandner, F. M., Sun, Y., O’Dell, C. W., et al. (2017) · Science · doi:10.1126/science.aam5745 · Cited by 305
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Metadata
- Authors
- O'Dell, C. W., Connor, B., Bösch, H., O'Brien, D., Frankenberg, C., Castano, R., Christi, M., Eldering, D., Fisher, B., Gunson, M., McDuffie, J., Miller, C. E., Natraj, V., Oyafuso, F., Polonsky, I., Smyth, M., Taylor, T., Toon, G. C., Wennberg, P. O., & Wunch, D.
- Venue
- Atmospheric Measurement Techniques
- Publisher
- Copernicus GmbH
- Published
- 2012-01-11
- Volume
- 5
- Issue
- 1
- Pages
- 99-121
- ISSN
- 1867-1381 (ISSN-L)
- 1867-8548
- OpenAlex
- W2128217321
- Cited by
- 577
- References
- 2
- FWCI
- 30.77
- Type
- journal article
- Language
- en
- Open access
- gold
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- O'Dell, C. W., Connor, B., Bösch, H., O'Brien, D., Frankenberg, C., Castano, R., Christi, M., Eldering, D., Fisher, B., Gunson, M., McDuffie, J., Miller, C. E., Natraj, V., Oyafuso, F., Polonsky, I., Smyth, M., Taylor, T., Toon, G. C., Wennberg, P. O., & Wunch, D. (2012). The ACOS CO 2 retrieval algorithm – Part 1: Description and validation against synthetic observations. Atmospheric Measurement Techniques. https://doi.org/10.5194/amt-5-99-2012
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
