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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 CH4–CO2 tracer–tracer correlations, we observed −18 to +22 % monthly variability in CH4 : CO2 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.
- Wong, Clare K. (Author)
- Pongetti, Thomas J. (Author)
- Oda, Tom (Author)
- Rao, Preeti (Author)
- Gurney, Kevin (Author)
- Newman, Sally (Author)
- Duren, Riley M. (Author)
- Miller, Charles E. (Author)
- Yung, Yuk L. (Author)
- Sander, Stanley P. (Author)
- College of Liberal Arts and Sciences (Contributor)
Wong, C. K., Pongetti, T. J., Oda, T., Rao, P., Gurney, K. R., Newman, S., . . . Sander, S. P. (2016). Monthly trends of methane emissions in Los Angeles from 2011 to 2015inferred by CLARS-FTS observations. Atmospheric Chemistry and Physics, 16(20), 13121-13130. doi:10.5194/acp-16-13121-2016
- 2018-02-21 03:27:58
- 2021-12-06 04:49:16
- 2 years 11 months ago