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The ACOS CO_2 retrieval algorithm – Part 1: Description and validation against synthetic observations

O'Dell, C. W. and Connor, B. and Bösch, H. and O'Brien, D. and Frankenberg, C. and Castano, R. and Christi, M. and Eldering, D. and Fisher, B. and Gunson, M. and McDuffie, J. and Miller, C. E. and Natraj, V. and Oyafuso, F. and Polonsky, I. and Smyth, M. and Taylor, T. and Toon, G. C. and Wennberg, P. O. and Wunch, D. (2012) The ACOS CO_2 retrieval algorithm – Part 1: Description and validation against synthetic observations. Atmospheric Measurement Techniques, 5 (1). pp. 99-121. ISSN 1867-1381. http://resolver.caltech.edu/CaltechAUTHORS:20140716-141221563

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Abstract

This work describes the NASA Atmospheric CO_2 Observations from Space (ACOS) X_(CO_2) 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.5194/amt-5-99-2012DOIArticle
http://www.atmos-meas-tech.net/5/99/2012/amt-5-99-2012.htmlPublisherArticle
ORCID:
AuthorORCID
Bösch, H.0000-0003-3944-9879
Frankenberg, C.0000-0002-0546-5857
Natraj, V.0000-0003-3154-9429
Oyafuso, F.0000-0002-8862-8737
Wennberg, P. O.0000-0002-6126-3854
Wunch, D.0000-0002-4924-0377
Alternate Title:The ACOS CO2 retrieval algorithm – Part 1: Description and validation against synthetic observations
Additional Information:© 2012 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. The authors wish to thank two anonymous reviewers for their constructive suggestions and insightful comments. We would like to thank several colleagues for work they have done that has helped this project: Bashwar Sen for early algorithm management, Linda Brown for spectroscopy development, Rob Spurr for help with the radiative transfer, Lukas Mandrake for GOSAT data analysis, and Ross Salawitch for many useful discussions. A portion of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The Colorado State University contributions to this work were carried out under NASA contract 1380533.
Funders:
Funding AgencyGrant Number
NASA1380533
Record Number:CaltechAUTHORS:20140716-141221563
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140716-141221563
Official Citation:O'Dell, C. W., Connor, B., Bösch, H., O'Brien, D., Frankenberg, C., Castano, R., . . . Wunch, D. (2012). The ACOS CO2 retrieval algorithm – Part 1: Description and validation against synthetic observations. Atmos. Meas. Tech., 5(1), 99-121. doi: 10.5194/amt-5-99-2012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47269
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:16 Jul 2014 23:31
Last Modified:15 Nov 2017 00:42

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