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Monthly trends of methane emissions in Los Angeles from 2011 to 2015 inferred by CLARS-FTS observations

Wong, Clare K. and Pongetti, Thomas J. and Oda, Tom and Rao, Preeti and Gurney, Kevin R. and Newman, Sally and Duren, Riley M. and Miller, Charles E. and Yung, Yuk L. and Sander, Stanley P. (2016) Monthly trends of methane emissions in Los Angeles from 2011 to 2015 inferred by CLARS-FTS observations. Atmospheric Chemistry and Physics, 16 (20). pp. 13121-13130. ISSN 1680-7324. doi:10.5194/acp-16-13121-2016.

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This paper presents an analysis of methane emissions from the Los Angeles Basin at monthly timescales across a 4-year time period – from September 2011 to August 2015. Using observations acquired by a ground-based near-infrared remote sensing instrument on Mount Wilson, California, combined with atmospheric CH_4–CO_2 tracer–tracer correlations, we observed −18 to +22 % monthly variability in CH_4 : CO_2 from the annual mean in the Los Angeles Basin. Top-down estimates of methane emissions for the basin also exhibit significant monthly variability (−19 to +31 % from annual mean and a maximum month-to-month change of 47 %). During this period, methane emissions consistently peaked in the late summer/early fall and winter. The estimated annual methane emissions did not show a statistically significant trend over the 2011 to 2015 time period.

Item Type:Article
Related URLs:
URLURL TypeDescription
Pongetti, Thomas J.0000-0001-9465-0853
Rao, Preeti0000-0002-5549-0583
Gurney, Kevin R.0000-0001-9218-7164
Newman, Sally0000-0003-0710-995X
Duren, Riley M.0000-0003-4723-5280
Miller, Charles E.0000-0002-9380-4838
Yung, Yuk L.0000-0002-4263-2562
Sander, Stanley P.0000-0003-1424-3620
Additional Information:© 2016 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. Received: 16 Mar 2016 – Published in Atmos. Chem. Phys. Discuss.: 29 Apr 2016; Revised: 06 Sep 2016 – Accepted: 10 Sep 2016 – Published: 26 Oct 2016. The research in this study was performed at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Clare K. Wong thanks the California Air Resources Board, NIST GHG and Climate Science Program, and the W. M. Keck Institute for Space Studies for support. The authors would like to acknowledge our colleagues at JPL and California Institute of Technology, and Risa Patarasuk at Arizona State University for helpful comments and suggestions.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
California Air Resources BoardUNSPECIFIED
National Institute of Standards and Technology (NIST)UNSPECIFIED
Keck Institute for Space Studies (KISS)UNSPECIFIED
Issue or Number:20
Record Number:CaltechAUTHORS:20161205-142301578
Persistent URL:
Official Citation:Wong, C. K., Pongetti, T. J., Oda, T., Rao, P., Gurney, K. R., Newman, S., Duren, R. M., Miller, C. E., Yung, Y. L., and Sander, S. P.: Monthly trends of methane emissions in Los Angeles from 2011 to 2015 inferred by CLARS-FTS observations, Atmos. Chem. Phys., 16, 13121-13130, doi:10.5194/acp-16-13121-2016, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72566
Deposited By: Tony Diaz
Deposited On:06 Dec 2016 20:07
Last Modified:11 Nov 2021 05:03

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