Item talk:Q238868

From geokb

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   "name": "Enhanced CO2 uptake at a shallow Arctic Ocean seep field overwhelms the positive warming potential of emitted methane",
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   "abstract": "Continued warming of the Arctic Ocean in coming decades is projected to trigger the release of teragrams (1 Tg = 106\u00a0tons) of methane from thawing subsea permafrost on shallow continental shelves and dissociation of methane hydrate on upper continental slopes. On the shallow shelves (<100 m water depth), methane released from the seafloor may reach the atmosphere and potentially amplify global warming. On the other hand, biological uptake of carbon dioxide (CO2) has the potential to offset the positive warming potential of emitted methane, a process that has not received detailed consideration for these settings. Continuous sea\u2212air gas flux data collected over a shallow ebullitive methane seep field on the Svalbard margin reveal atmospheric CO2\u00a0uptake rates (\u221233,300 \u00b1 7,900 \u03bcmol m\u22122\u22c5d\u22121) twice that of surrounding waters and \u223c1,900 times greater than the diffusive sea\u2212air methane efflux (17.3 \u00b1 4.8 \u03bcmol m\u22122\u22c5d\u22121). The negative radiative forcing expected from this CO2\u00a0uptake is up to 231 times greater than the positive radiative forcing from the methane emissions. Surface water characteristics (e.g., high dissolved oxygen, high pH, and enrichment of\u00a013C in CO2) indicate that upwelling of cold, nutrient-rich water from near the seafloor accompanies methane emissions and stimulates CO2\u00a0consumption by photosynthesizing phytoplankton. These findings challenge the widely held perception that areas characterized by shallow-water methane seeps and/or strongly elevated sea\u2212air methane flux always increase the global atmospheric greenhouse gas burden.",
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