Real-time remote detection and measurement for airborne imaging spectroscopy: a case study with methane
Article, Other literature type
Thompson, D. R.
Green, R. O.
Thorpe, A. K.
- Publisher: Copernicus Publications
(issn: 1867-8548, eissn: 1867-8548)
TA170-171 | Earthwork. Foundations | Environmental engineering | TA715-787
Localized anthropogenic sources of atmospheric CH<sub>4</sub> are highly
uncertain and temporally variable. Airborne remote measurement is an
effective method to detect and quantify these emissions. In a campaign
context, the science yield can be dramatically increased by real-time
retrievals that allow operators to coordinate multiple measurements of the
most active areas. This can improve science outcomes for both single- and
multiple-platform missions. We describe a case study of the NASA/ESA
CO<sub>2</sub> and MEthane eXperiment (COMEX) campaign in California during June
and August/September 2014. COMEX was a multi-platform campaign to measure
CH<sub>4</sub> plumes released from anthropogenic sources including oil and gas
infrastructure. We discuss principles for real-time spectral signature
detection and measurement, and report performance on the NASA Next Generation
Airborne Visible Infrared Spectrometer (AVIRIS-NG). AVIRIS-NG successfully
detected CH<sub>4</sub> plumes in real-time at Gb s<sup>−1</sup> data rates,
characterizing fugitive releases in concert with other in situ and remote
instruments. The teams used these real-time CH<sub>4</sub> detections to
coordinate measurements across multiple platforms, including airborne
in situ, airborne non-imaging remote sensing, and ground-based in situ
instruments. To our knowledge this is the first reported use of real-time
trace-gas signature detection in an airborne science campaign, and presages
many future applications. Post-analysis demonstrates matched filter methods
providing noise-equivalent (1σ) detection sensitivity for 1.0 %
CH4 column enhancements equal to 141 ppm m.