Physics – Geophysics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3810702b&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 10, CiteID L10702
Physics
Geophysics
Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Biogeosciences: Remote Sensing, Biogeosciences: Trace Gases, Global Change: Atmosphere (0315, 0325), Marine Geology And Geophysics: Gas And Hydrate Systems
Scientific paper
The relative source contributions of methane (CH4) have high uncertainty, creating a need for local-scale characterization in concert with global satellite measurements. However, efforts towards methane plume imaging have yet to provide convincing results for concentrated sources. Although atmospheric CH4 mapping did not motivate the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) design, recent studies suggest its potential for studying concentrated CH4 sources such as the Coal Oil Point (COP) seep field (˜0.015 Tg CH4 yr-1) offshore Santa Barbara, California. In this study, we developed a band ratio approach on high glint COP AVIRIS data and demonstrate the first successful local-scale remote sensing mapping of natural atmospheric CH4 plumes. Plume origins closely matched surface and sonar-derived seepage distributions, with plume characteristics consistent with wind advection. Imaging spectrometer data may also be useful for high spatial-resolution characterization of concentrated, globally-significant CH4 emissions from offshore platforms and cattle feedlots.
Bradley Eliza S.
Dennison Philip E.
Leifer Ira
Roberts Dar A.
Washburn Libe
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