Detection of marine methane emissions with AVIRIS band ratios

作者：Bradley Eliza S^*; Leifer Ira; Roberts Dar A; Dennison Philip E; Washburn Libe

来源：Geophysical Research Letters, 2011, 38: L10702.

DOI：10.1029/2011GL046729

The relative source contributions of methane (CH(4)) 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 CH(4) mapping did not motivate the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) design, recent studies suggest its potential for studying concentrated CH(4) sources such as the Coal Oil Point (COP) seep field (similar to 0.015 Tg CH(4) 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 CH(4) 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 CH(4) emissions from offshore platforms and cattle feedlots. Citation: Bradley, E. S., I. Leifer, D. A. Roberts, P. E. Dennison, and L. Washburn (2011), Detection of marine methane emissions with AVIRIS band ratios, Geophys. Res. Lett., 38, L10702, doi:10.1029/2011GL046729.

• 出版日期2011-5-20