Russian-German cooperation SYSTEM LAPTEV SEA : the Expeditions Laptev Sea - Mamontov Klyk 2011 & Buor Khaya 2012.

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dc.contributor.author Overduin, Pier Paul
dc.contributor.author Liebner, Susanne
dc.contributor.author Knoblauch, Christian
dc.contributor.author Günther, Frank
dc.contributor.author Wetterich, Sebastian
dc.contributor.author Schirrmeister, Lutz
dc.contributor.author Hubberten, Hans-Wolfgang
dc.contributor.author Grigoriev, Mikhail N
dc.coverage.spatial LATITUDE: 71.422300 * LONGITUDE: 132.084800 * DATE/TIME START: 2012-04-19T00:00:00 * DATE/TIME END: 2012-04-23T00:00:00
dc.date.accessioned 2019-11-26T04:00:15Z
dc.date.available 2019-11-26T04:00:15Z
dc.date.issued 2015-05-18
dc.identifier https://doi.pangaea.de/10.1594/PANGAEA.846279
dc.identifier https://doi.org/10.1594/PANGAEA.846279
dc.identifier.citation Günther, Frank; Overduin, Pier Paul; Makarov, Aleksandr; Grigoriev, Mikhail N (2013): Russian-German cooperation SYSTEM LAPTEV SEA : the Expeditions Laptev Sea - Mamontov Klyk 2011 & Buor Khaya 2012. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 664, 113 pp, https://doi.org/10.2312/BzPM_0664_2013
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/8023
dc.description.abstract Submarine permafrost degradation has been invoked as a cause for recent observations of methane emissions from the seabed to the water column and atmosphere of the East Siberian shelf. Sediment drilled 52 m down from the sea ice in Buor Khaya Bay, central Laptev Sea revealed unfrozen sediment overlying ice-bonded permafrost. Methane concentrations in the overlying unfrozen sediment were low (mean 20 µM) but higher in the underlying ice-bonded submarine permafrost (mean 380 µM). In contrast, sulfate concentrations were substantially higher in the unfrozen sediment (mean 2.5 mM) than in the underlying submarine permafrost (mean 0.1 mM). Using deduced permafrost degradation rates, we calculate potential mean methane efflux from degrading permafrost of 120 mg/m**2 per year at this site. However, a drop of methane concentrations from 190 µM to 19 µM and a concomitant increase of methane d13C from -63 per mil to -35 per mil directly above the ice-bonded permafrost suggest that methane is effectively oxidized within the overlying unfrozen sediment before it reaches the water column. High rates of methane ebullition into the water column observed elsewhere are thus unlikely to have ice-bonded permafrost as their source.
dc.format application/zip, 3 datasets
dc.language.iso en
dc.publisher PANGAEA
dc.relation.isbasedon Günther, Frank; Overduin, Pier Paul; Makarov, Aleksandr; Grigoriev, Mikhail N (2013): Russian-German cooperation SYSTEM LAPTEV SEA : the Expeditions Laptev Sea - Mamontov Klyk 2011 & Buor Khaya 2012. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 664, 113 pp, https://doi.org/10.2312/BzPM_0664_2013
dc.rights CC-BY-3.0: Creative Commons Attribution 3.0 Unported
dc.rights Access constraints: unrestricted
dc.source Supplement to: Overduin, Pier Paul; Liebner, Susanne; Knoblauch, Christian; Günther, Frank; Wetterich, Sebastian; Schirrmeister, Lutz; Hubberten, Hans-Wolfgang; Grigoriev, Mikhail N (2015): Methane oxidation following submarine permafrost degradation: Measurements from a central Laptev Sea shelf borehole. Journal of Geophysical Research: Biogeosciences, 120(5), 965-978, https://doi.org/10.1002/2014JG002862
dc.subject AWI_PerDyn
dc.subject Permafrost Research (Periglacial Dynamics) @ AWI
dc.title Russian-German cooperation SYSTEM LAPTEV SEA : the Expeditions Laptev Sea - Mamontov Klyk 2011 & Buor Khaya 2012.
dc.title.alternative Borehole temperature, submarine permafrost methane concentrations and pore water chemistry measured on borehole BK-2, central Laptev Sea shelf
dc.type Dataset


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