Greenland melt drives continuous export of methane from the ice-sheet bed – Nature.com

  • 1.

    Kirschke, S. et al. Three decades of global methane sources and sinks. Nat. Geosci. 6, 813–823 (2013).

  • 2.

    Schaefer, H. et al. A 21st century shift from fossil-fuel to biogenic methane emissions indicated by 13CH4. Science 352, 80–84 (2016).

  • 3.

    Wadham, J. L., Tranter, M., Tulaczyk, S. & Sharp, M. Subglacial methanogenesis: a potential climatic amplifier? Global Biogeochem. Cy. 22, GB2021 (2008).

  • 4.

    Wadham, J. L. et al. Potential methane reservoirs beneath Antarctica. Nature 488, 633–637 (2012).

  • 5.

    Dieser, M. et al. Molecular and biogeochemical evidence for methane cycling beneath the western margin of the Greenland Ice Sheet. ISME J. 8, 2305–2316 (2014).

  • 6.

    Stanley, E. H. et al. The ecology of methane in streams and rivers: patterns, controls, and global significance. Ecol. Monogr. 86, 146–171 (2016).

  • 7.

    Weitemeyer, K. A. & Buffett, B. A. Accumulation and release of methane from clathrates below the Laurentide and Cordilleran ice sheets. Global Planet. Change 53, 176–187 (2006).

  • 8.

    Michaud, A. B. et al. Microbial oxidation as a methane sink beneath the West Antarctic Ice Sheet. Nat. Geosci. 10, 582–586 (2017).

  • 9.

    Petrenko, V. V. et al. Minimal geological methane emissions during the Younger Dryas–Preboreal abrupt warming event. Nature 548, 443–446 (2017).

  • 10.

    Portnov, A., Vadakkepuliyambatta, S., Mienert, J. & Hubbard, A. Ice-sheet-driven methane storage and release in the Arctic. Nat. Commun. 7, (2016).

  • 11.

    Souchez, R., Lemmens, M. & Chappellaz, J. Flow-induced mixing in the GRIP basal ice deduced from the CO2 and CH4 records. Geophys. Res. Lett. 22, 41–44 (1995).

  • 12.

    Miteva, V., Teacher, C., Sowers, T. & Brenchley, J. Comparison of the microbial diversity at different depths of the GISP2 Greenland ice core in relationship to deposition climates. Environ. Microbiol. 11, 640–656 (2009).

  • 13.

    Christner, B. C., Montross, G. G. & Priscu, J. C. Dissolved gases in frozen basal water from the NGRIP borehole: implications for biogeochemical processes beneath the Greenland Ice Sheet. Polar Biol. 35, 1735–1741 (2012).

  • 14.

    Schmidt, M., Linke, P. & Esser, D. Recent development in IR sensor technology for monitoring subsea methane discharge. Mar. Technol. Soc. J. 47, 27–36 (2013).

  • 15.

    Cowton, T., Nienow, P., Bartholomew, I., Sole, A. & Mair, D. Rapid erosion beneath the Greenland ice sheet. Geology 40, 343–346 (2012).

  • 16.

    Kohler, T. J. et al. Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. Geophys. Res. Lett. 44, 6209–6217 (2017).

  • 17.

    Stibal, M. et al. Methanogenic potential of Arctic and Antarctic subglacial environments with contrasting organic carbon sources. Glob. Change Biol. 18, 3332–3345 (2012).

  • 18.

    Bartholomew, I. et al. Supraglacial forcing of subglacial drainage in the ablation zone of the Greenland ice sheet. Geophys. Res. Lett. 38, L08502 (2011).

  • 19.

    Raymond, P. A. et al. Global carbon dioxide emissions from inland waters. Nature 503, 355–359 (2013); erratum 507, 387 (2013).

  • 20.

    Chandler, D. M. et al. Evolution of the subglacial drainage system beneath the Greenland Ice Sheet revealed by tracers. Nat. Geosci. 6, 195–198 (2013).

  • 21.

    Hall, R. O., Kennedy, T. A. & Rosi-Marshall, E. J. Air–water oxygen exchange in a large whitewater river. Limnol. Oceanogr. Fluids Environ. 2, 1–11 (2012).

  • 22.

    Maurice, L., Rawlins, B. G., Farr, G., Bell, R. & Gooddy, D. C. The influence of flow and bed slope on gas transfer in steep streams and their implications for evasion of CO2. J. Geophys. Res. Biogeosci. 122, 2862–2875 (2017).

  • 23.

    Walter Anthony, K. M., Anthony, P., Grosse, G. & Chanton, J. Geologic methane seeps along boundaries of Arctic permafrost thaw and melting glaciers. Nat. Geosci. 5, 419–426 (2012).

  • 24.

    Telling, J. et al. Rock comminution as a source of hydrogen for subglacial ecosystems. Nat. Geosci. 8, 851–855 (2015); erratum 8, 981 (2015).

  • 25.

    Whiticar, M. J. Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane. Chem. Geol. 161, 291–314 (1999).

  • 26.

    Etiope, G. & Sherwood Lollar, B. Abiotic methane on Earth. Rev. Geophys. 51, 276–299 (2013).

  • 27.

    Walter, F., Chaput, J. & Lüthi, M. P. Thick sediments beneath Greenland’s ablation zone and their potential role in future ice sheet dynamics. Geology 42, 487–490 (2014).

  • 28.

    Wingham, D. J., Siegert, M. J., Shepherd, A. & Muir, A. S. Rapid discharge connects Antarctic subglacial lakes. Nature 440, 1033–1036 (2006).

  • 29.

    Beaton, A. D. et al. High-resolution in situ measurement of nitrate in runoff from the Greenland Ice Sheet. Environ. Sci. Technol. 51, 12518–12527 (2017).

  • 30.

    Hawkings, J. R. et al. Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans. Nat. Commun. 5, 3929 (2014).

  • 31.

    Ward, J. A. et al. Microbial hydrocarbon gases in the Witwatersrand Basin, South Africa: implications for the deep biosphere. Geochim. Cosmochim. Acta 68, 3239–3250 (2004).

  • 32.

    Wiesenburg, D. A. & Guinasso, N. L., Jr. Equilibrium solubilities of methane, carbon monoxide, and hydrogen in water and sea water. J. Chem. Eng. Data 24, 356–360 (1979).

  • 33.

    Raymond, P. A. et al. Scaling the gas transfer velocity and hydraulic geometry in streams and small rivers. Limnol. Oceanogr. Fluids Environ. 2, 41–53 (2012).

  • 34.

    Wanninkhof, R. Relationship between wind speed and gas exchange over the ocean revisited. Limnol. Oceanogr. Methods 12, 351–362 (2014).

  • 35.

    Sherwood Lollar, B., Hirschorn, S. K., Chartrand, M. M. G. & Lacrampe-Couloume, G. An approach for assessing total instrumental uncertainty in compound-specific carbon isotope analysis: implications for environmental remediation studies. Anal. Chem. 79, 3469–3475 (2007).

  • 36.

    Davie, M. K. & Buffett, B. A. A numerical model for the formation of gas hydrate below the seafloor. J. Geophys. Res. 106, 497–514 (2001).

  • 37.

    Tedesco, M. et al. Evidence and analysis of 2012 Greenland records from spaceborne observations, a regional climate model and reanalysis data. Cryosphere 7, 615–630 (2013).

  • 38.

    Palmer, S., Shepherd, A., Nienow, P. & Joughin, I. Seasonal speedup of the Greenland Ice Sheet linked to routing of surface water. Earth Planet. Sci. Lett. 302, 423–428 (2011).

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