Articles | Volume 17, issue 13
https://doi.org/10.5194/acp-17-8313-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acp-17-8313-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
07 Jul 2017
Research article |
| 07 Jul 2017
Carbon dioxide and methane measurements from the Los Angeles Megacity Carbon Project – Part 1: calibration, urban enhancements, and uncertainty estimates
Kristal R. Verhulst
CORRESPONDING AUTHOR
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
University of California, Los Angeles, Joint Institute for Regional
Earth System Science and Engineering, Los Angeles, CA, USA
Anna Karion
National Institute of Standards and Technology (NIST), Gaithersburg,
MD, USA
Jooil Kim
Scripps Institution of Oceanography, University of California, San
Diego, La Jolla, CA, USA
Peter K. Salameh
Scripps Institution of Oceanography, University of California, San
Diego, La Jolla, CA, USA
Ralph F. Keeling
Scripps Institution of Oceanography, University of California, San
Diego, La Jolla, CA, USA
Sally Newman
California Institute of Technology, Division of Geological
and Planetary Sciences, Pasadena, CA, USA
now at: Bay Area Air Quality Management District, Planning and
Research Division, Climate Protection Section, San Francisco, CA, USA
John Miller
NOAA/ESRL/GMD, Boulder, CO, USA
CIRES, University of Colorado, Boulder, Boulder, CO, USA
Christopher Sloop
Earth Networks, Inc., Germantown, MD, USA
Thomas Pongetti
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
Preeti Rao
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
now at: University of Michigan, School of Natural Resources and
Environment, Ann Arbor, MI, USA
Clare Wong
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
California Institute of Technology, Division of Geological
and Planetary Sciences, Pasadena, CA, USA
now at: California State University, Northridge, Institutional
Research Office, Northridge, CA, USA
Francesca M. Hopkins
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
now at: University of California, Riverside, Department of Environmental
Sciences, Riverside, CA, USA
Vineet Yadav
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
Ray F. Weiss
Scripps Institution of Oceanography, University of California, San
Diego, La Jolla, CA, USA
Riley M. Duren
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
Charles E. Miller
NASA Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA, USA
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Discussed (final revised paper)
Latest update: 21 May 2025
Short summary
We present the first carbon dioxide (CO2) and methane (CH4) measurements from an extensive surface network as part of the Los Angeles Megacity Carbon Project. We describe methods that are essential for understanding carbon fluxes from complex urban environments. CO2 and CH4 levels are spatially and temporally variable, with urban sites showing significant enhancements relative to background. In 2015, the median afternoon enhancement near downtown Los Angeles was ~15 ppm CO2 and ~80 ppb CH4.
We present the first carbon dioxide (CO2) and methane (CH4) measurements from an extensive...
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