Kort, Eric A. and Frankenberg, Christian and Miller, Charles E. and Oda, Tom (2012) Space-based observations of megacity carbon dioxide. Geophysical Research Letters, 39 (17). Art. No. L17806. ISSN 0094-8276. doi:10.1029/2012GL052738. https://resolver.caltech.edu/CaltechAUTHORS:20150512-090512031
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Abstract
Urban areas now house more than half the world's population, and are estimated to contribute over 70% of global energy-related CO_2 emissions. Many cities have emission reduction policies in place, but lack objective, observation-based methods for verifying their outcomes. Here we demonstrate the potential of satellite-borne instruments to provide accurate global monitoring of megacity CO_2 emissions using GOSAT observations of column averaged CO_2 dry air mole fraction (X_(CO_2)) collected over Los Angeles and Mumbai. By differencing observations over the megacity with those in nearby background, we observe robust, statistically significant X_(CO_2) enhancements of 3.2 ± 1.5 ppm for Los Angeles and 2.4 ± 1.2 ppm for Mumbai, and find these enhancements can be exploited to track anthropogenic emission trends over time. We estimate that X_(CO_2) changes as small as 0.7 ppm in Los Angeles, corresponding to a 22% change in emissions, could be detected with GOSAT at the 95% confidence level.
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| Additional Information: | © 2012 American Geophysical Union. Received 14 June 2012; revised 25 July 2012; accepted 3 August 2012; published 14 September 2012. This work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. EAK thanks the W. M. Keck Institute for Space Studies for support. GOSAT Level 1B products (spectral data) were provided by the GOSAT Project (JAXA, NIES, and Ministry of the Environment Japan) through its collaboration with NASA’s Atmospheric CO_2 Observations from Spaces (ACOS) team. The X_(CO_2) data used in this work were processed by the ACOS team using software build 2.9. The authors thank the GOSAT and OCO/ACOS teams for continued collaboration and detailed technical discussions. The authors wish to thank Paul Wennberg, Yuk Yung, Michael Gunson, and Annmarie Eldering for insightful and constructive suggestions and comments. | |||||||||
| Group: | Keck Institute for Space Studies | |||||||||
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| Issue or Number: | 17 | |||||||||
| DOI: | 10.1029/2012GL052738 | |||||||||
| Record Number: | CaltechAUTHORS:20150512-090512031 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150512-090512031 | |||||||||
| Official Citation: | Kort, E. A., C. Frankenberg, C. E. Miller, and T. Oda (2012), Space-based observations of megacity carbon dioxide, Geophys. Res. Lett., 39, L17806, doi:10.1029/2012GL052738 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 57434 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 12 May 2015 17:45 | |||||||||
| Last Modified: | 10 Nov 2021 21:12 |
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