Methane (CH4) is one of the most important greenhouse gases, and an important energy carrier in biogas and natural gas. Its large-scale emission patterns have been unpredictable and the source and sink distributions are poorly constrained. Remote assessment of CH4 with high sensitivity at a m2 spatial resolution would allow detailed mapping of the near-ground distribution and anthropogenic sources in landscapes but has hitherto not been possible. Here we show that CH4 gradients can be imaged on the <m2 scale at ambient levels (∼1.8 ppm) and filmed using optimized infrared (IR) hyperspectral imaging. Our approach allows both spectroscopic confirmation and quantification for all pixels in an imaged scene simultaneously. It also has the ability to map fluxes for dynamic scenes. This approach to mapping boundary layer CH4 offers a unique potential way to improve knowledge about greenhouse gases in landscapes and a step towards resolving source–sink attribution and scaling issues.
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IPCC Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) (Cambridge Univ. Press, 2013).
Kirschke, S. et al. Three decades of global methane sources and sinks. Nature Geosci. 6, 813–823 (2013).
Reeburgh, W. S. in Treatise on Geochemistry Vol. 4 (ed. Keeling, R.) 65–89 (Elsevier, 2003).
Denmead, O. T. Approaches to measuring fluxes of methane and nitrous oxide between landscapes and the atmosphere. Plant Soil 309, 5–24 (2008).
Flesch, T. K. et al. Multi-source emission determination using an inverse-dispersion technique. Bound. Layer Meteorol. 132, 11–30 (2009).
Frankenberg, C. et al. Global column-averaged methane mixing ratios from 2003 to 2009 as derived from SCIAMACHY: trends and variability. J. Geophys. Res. 116, D04302 (2011).
Bril, A. et al. Retrievals of atmospheric CO2, CH4 and optical path modifications from the GOSAT observations. Proc. SPIE 8890, 889008 (2013).
Xiong, X. et al. Seven years’ observation of mid-upper tropospheric methane from atmospheric infrared sounder. Remote Sens. 2, 2509–2530 (2010).
Crevoisier, C. et al. Tropospheric methane in the tropics—first year from IASI hyperspectral infrared observations. Atmos. Chem. Phys. 9, 6337–6350 (2009).
Buchwitz, M. et al. Carbon monitoring satellite (CarbonSat): assessment of atmospheric CO2 and CH4 retrieval errors by error parameterization. Atmos. Meas. Tech. 6, 3477–3500 (2013).
Schoeberl, M. et al. The geostationary remote infrared pollution sounder (GRIPS): Measurement of the carbon gases from space. Proc. SPIE 8866, 886602 (2013).
Beck, V. et al. Methane airborne measurements and comparison to global models during BARCA. J. Geophys. Res. 117, D15310 (2012).
Bergamaschi, P. et al. Inverse modeling of global and regional CH4 emissions using SCIAMACHY satellite retrievals. J. Geophys. Res. 114, D22301 (2009).
Schneising, O. et al. Three years of greenhouse gas column-averaged dry air mole fractions retrieved from satellite—Part 2: Methane. Atmos. Chem. Phys. 9, 443–465 (2009).
Worden, J. et al. CH4 and CO distributions over tropical fires during October 2006 as observed by the Aura TES satellite instrument and modeled by GEOS-Chem. Atmos. Chem. Phys. 13, 3679–3692 (2013).
Satellite data shows U.S. Methane ‘hot spot’ bigger than expected. NASA News (9 October 2014); http://www.nasa.gov/press/2014/october/satellite-data-shows-us-methane-hot-spot-bigger-than-expected.
Gerilowski, K. et al. MAMAP—a new spectrometer system for column-averaged methane and carbon dioxide observations from aircraft: Instrument description and performance analysis. Atmos. Meas. Tech. 4, 215–243 (2011).
Roberts, D. A. et al. Mapping methane emissions from a marine geological seep source using imaging spectrometry. Remote Sens. Environ. 114, 592–606 (2010).
Thorpe, A. K. et al. High resolution mapping of methane emissions from marine and terrestrial sources using a Cluster-Tuned Matched Filter technique and imaging spectrometry. Remote Sens. Environ. 134, 305–318 (2013).
Tratt, D. M. et al. Airborne visualization and quantification of discrete methane sources in the environment. Remote Sens. Environ. 154, 74–88 (2014).
Cottle, D. J., Nolan, J. V. & Wiedemann, S. G. Ruminant enteric methane mitigation: A review. Anim. Prod. Sci. 51, 491–514 (2011).
Tremblay, P. Standoff gas identification and quantification from turbulent stack plumes with an imaging Fourier-transform spectrometer. Proc. SPIE 7673, 76730H (2010).
Savary, S. Standoff identification and quantification of flare emissions using infrared hyperspectral imaging. Proc. SPIE 8024, 880240T (2011).
Astrup, T. et al. Incineration and co-combustion of waste: Accounting of greenhouse gases and global warming contributions. Waste Manag. Res. 27, 789–799 (2009).
Uggetti, E. et al. Quantification of greenhouse gas emissions from sludge treatment wetlands. Wat. Resour. 46, 1755–1762 (2012).
Flodman, M. Emissioner av Metan, Lustgas och Ammoniak vid Lagring av Avvattnat Rötslam (Emissions of Methane, Nitrous Oxide and Ammonia during Storage of Dewatered Sludge) MSc thesis, Swedish Univ. Agricultural Sciences (2002).
Tekniska Verken Environmental Report (Tekniska Verken, 2013); https://www.tekniskaverken.se/contentassets/4d1aac7dc84c40ee9d25099d40c05325/2013-miljorapport-garstadverket-29425.pdf.
This study was funded by an instrument grant from the Knut and Alice Wallenberg Foundation (ref no. KAW 2010.0126) to the authors and by a grant from the Swedish Research Council VR to D.B. (ref. no. VR 2012-48). We thank the camera production team at Telops Quebec City, Canada, for their great interest, for committing exceptional expertise in the hardware development, and for invaluable support. We also thank H. Reyier (Linköping University) for practical assistance and P. Falkenström and R. Sahlée for help with accessing measurement locations.
The authors declare no competing financial interests.
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Gålfalk, M., Olofsson, G., Crill, P. et al. Making methane visible. Nature Clim Change 6, 426–430 (2016). https://doi.org/10.1038/nclimate2877
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