Viser treff 326-345 av 698

    • Labilibaculum manganireducens gen. nov., sp. nov. and Labilibaculum filiforme sp. nov., Novel Bacteroidetes Isolated from Subsurface Sediments of the Baltic Sea 

      Vandieken, Verona; Marshall, Ian P.G.; Niemann, Helge; Engelen, Bert; Cypionka, Heribert (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-05)
      Microbial communities in deep subsurface sediments are challenged by the decrease in amount and quality of organic substrates with depth. In sediments of the Baltic Sea, they might additionally have to cope with an increase in salinity from ions that have diffused downward from the overlying water during the last 9000 years. Here, we report the isolation and characterization of four novel bacteria ...
    • Lake Sedimentary DNA Research on Past Terrestrial and Aquatic Biodiversity: Overview and Recommendations 

      Capo, Eric; Giguet-Covex, Charline; Rouillard, Alexandra; Nota, Kevin; Heintzman, Peter D.; Vuillemin, Aurèle; Ariztegui, Daniel; Arnaud, Fabien; Belle, Simon; Bertilsson, Stefan; Bigler, Christian; Bindler, Richard; Brown, Antony G.; Clarke, Charlotte L.; Crump, Sarah E.; Debroas, Didier; Englund, Göran; Ficetola, Gentile Francesco; Garner, Rebecca E.; Gauthier, Joanna; Gregory-Eaves, Irene; Heinecke, Liv; Herzschuh, Ulrike; Ibrahim, Anan; Kisand, Veljo; Kjær, Kurt H.; Lammers, Youri; Littlefair, Joanne; Messager, Erwan; Monchamp, Marie-Eve; Olajos, Fredrik; Orsi, William; Pedersen, Mikkel W.; Rijal, Dilli P.; Rydberg, Johan; Spanbauer, Trisha; Stoof-Leichsenring, Kathleen R.; Taberlet, Pierre; Talas, Liisi; Thomas, Camille; Walsh, David A.; Wang, Yucheng; Willerslev, Eske; van Woerkom, Anne; Zimmermann, Heike H.; Coolen, Marco J. L.; Epp, Laura S.; Domaizon, Isabelle; Alsos, Inger G.; Parducci, Laura (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-13)
      The use of lake sedimentary DNA to track the long-term changes in both terrestrial and aquatic biota is a rapidly advancing field in paleoecological research. Although largely applied nowadays, knowledge gaps remain in this field and there is therefore still research to be conducted to ensure the reliability of the sedimentary DNA signal. Building on the most recent literature and seven original ...
    • Large subglacial meltwater features in the central Barents Sea 

      Bjarnadóttir, Lilja Rún; Winsborrow, Monica; Andreassen, Karin (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-02-01)
      During the last glacial period large parts of the Arctic, including the Barents Sea, north of Norway and Russia, were covered by ice sheets. Despite several studies indicating that melting occurred beneath much of the Barents Sea ice sheet, very few meltwater-related landforms have been identified. We document ∼200 seafloor valleys in the central Barents Sea and interpret them to be tunnel valleys ...
    • Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet 

      Hawkings, Jon R.; Linhoff, Benjamin S.; Wadham, Jemma L.; Stibal, Marek; Lamborg, Carl H.; Carling, Gregory T.; Lamarche-Gagnon, Guillaume; Kohler, Tyler J.; Ward, Rachael; Hendry, Katharine R.; Falteisek, Lukáš; Kellerman, Anne M.; Cameron, Karen A.; Hatton, Jade E.; Tingey, Sarah; Holt, Amy D.; Vinšová, Petra; Hofer, Stefan; Bulínová, Marie; Větrovský, Tomáš; Meire, Lorenz; Spencer, Robert G. M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-24)
      The Greenland Ice Sheet is currently not accounted for in Arctic mercury budgets, despite large and increasing annual runoff to the ocean and the socio-economic concerns of high mercury levels in Arctic organisms. Here we present concentrations of mercury in meltwaters from three glacial catchments on the southwestern margin of the Greenland Ice Sheet and evaluate the export of mercury to downstream ...
    • A large West Antarctic Ice Sheet explains early Neogene sea-level amplitude 

      Marschalek, J. W.; Zurli, L.; Talarico, F.; van de Flierdt, T.; Vermeesch, P.; Carter, A.; Beny, F.; Bout-Roumazeilles, V.; Sangiorgi, F.; Hemming, S. R.; Pérez, L. F.; Colleoni, F.; Prebble, J. G.; van Peer, T. E.; Perotti, M.; Shevenell, A. E.; Browne, I.; Kulhanek, D. K.; Levy, R.; Harwood, D.; Sullivan, N. B.; Meyers, S. R.; Griffith, E. M.; Hillenbrand, C. D.; Gasson, E.; Siegert, M. J.; Keisling, B.; Licht, K. J.; Kuhn, G.; Dodd, J. P.; Boshuis, C.; de Santis, L.; McKay, R. M.; Ash, J.; Cortese, G.; Esper, O. V.; Gales, J. A.; Ishino, S.; Kim, Sookwan; Kim, Sunghan; Laberg, Jan Sverre; Leckie, R. M.; Muller, J.; Patterson, M. O.; Romans, B. W.; Romero, O. E.; Seki, O.; Singh, S. M.; Cordeiro de Sousa, I. M.; Sugisaki, S. T. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021)
      Early to Middle Miocene sea-level oscillations of approximately 40–60 m estimated from far-field records1,2,3 are interpreted to reflect the loss of virtually all East Antarctic ice during peak warmth2. This contrasts with ice-sheet model experiments suggesting most terrestrial ice in East Antarctica was retained even during the warmest intervals of the Middle Miocene4,5. Data and model outputs can ...
    • Large-scale culturing of Neogloboquadrina pachyderma, its growth in, and tolerance of, variable environmental conditions 

      Westgård, Adele; Mohamed, Mohamed Mahmoud Ezat Ahmed; Chalk, Tom; Chierici, Melissa; Foster, Gavin L.; Meilland, Julie (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-09)
      The planktic foraminifera Neogloboquadrina pachyderma is a calcifying marine protist and the dominant planktic foraminifera species in the polar oceans, making it a key species in marine polar ecosystems. The calcium carbonate shells of foraminifera are widely used in palaeoclimate studies because their chemical composition reflects the seawater conditions in which they grow. This species provides ...
    • The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling 

      Ghisetti, Francesca C.; Barnes, Philip M.; Ellis, Susan; Plaza-Faverola, Andreia; Barker, Daniel H.N. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-17)
      Three depth-converted and geologically interpreted seismic profiles provide a clear image of the offshore outer accretionary wedge associated with oblique subduction of the Pacific Plate beneath the central Hikurangi margin. Plio-Quaternary turbidites deposited over the pelagic cover sequence of the Hikurangi Plateau have been accreted to the margin by imbrication along E-verging thrust faults that ...
    • Last glacial ice sheet dynamics offshore NE Greenland – a case study from Store Koldewey Trough 

      Olsen, Ingrid Leirvik; Rydningen, Tom Arne; Forwick, Matthias; Laberg, Jan Sverre; Husum, Katrine (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-04)
      The presence of a grounded Greenland Ice Sheet on the northeastern part of the Greenland continental shelf during the Last Glacial Maximum is supported by new swath bathymetry and high-resolution seismic data, supplemented with multi-proxy analyses of sediment gravity cores from Store Koldewey Trough. Subglacial till fills the trough, with an overlying drape of maximum 2.5 m thick glacier-proximal ...
    • The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin 

      Zamelczyk, Katarzyna; Rasmussen, Tine Lander; Raitzsch, Markus; Chierici, Melissa (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-20)
      We reconstruct climate and changes in water-mass properties in relation to variations in palaeoproductivity at the south-western Svalbard margin throughout the last 2000 years. Environmental conditions in subsurface (ca. 250–75 m) and near-surface to surface water (75–0 m) were studied on the basis of the distribution patterns and fluxes of planktic foraminiferal faunas. Stable isotopes in three ...
    • Late Cenozoic development of the continental margin off Lofoten-Vesterålen and Troms 

      Rydningen, Tom Arne; Vorren, Tore Ola (Conference object; Konferansebidrag, 2011)
    • Late Cenozoic erosion estimates for the northern Barents Sea: Quantifying glacial sediment input to the Arctic Ocean 

      Lasabuda, Amando Putra Ersaid; Geissler, Wolfram H.; Laberg, Jan Sverre; Knutsen, Stig-Morten; Rydningen, Tom Arne; Berglar, Kai (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-14)
      A compilation of seismic data has been used to characterize the Neogene – Quaternary sedimentary succession of the northwestern Barents Sea continental margin to better understand the paleoenvironmental evolution and the sedimentary processes involved. The Neogene strata are dominated by contourites related to the ocean circulation established from the opening of the Fram Strait connecting the ...
    • Late Cenozoic paleoenvironment and erosion estimates for the NE Svalbard continental margin – preliminary results 

      Lasabuda, Amando Putra Ersaid; Geissler, Wolfram H; Laberg, Jan Sverre; Knutsen, Stig-Morten (Conference object; Konferansebidrag, 2017)
    • Late Devonian–Carboniferous faulting and controlling structures and fabrics in NW Finnmark 

      Koehl, Jean-Baptiste P.; Bergh, Steffen G; Osmundsen, Per Terje; Redfield, Thomas Fitzmaurice; Indrevær, Kjetil; Lea, Halldis; Bergø, Espen (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-10)
      In the SW Barents Sea, Devonian–Carboniferous collapse led to the formation of major basins and faults, e.g., the Hammerfest Basin bounded by the Troms–Finnmark Fault Complex, and rhomboid- to sigma-shaped (half-)grabens on the Finnmark Platform. High-resolution aeromagnetic and bathymetry data from the shallow shelf show that analogue fault systems are present in coastal and onshore areas of NW ...
    • A Late Glacial–Early Holocene multiproxy record from the eastern Fram Strait, Polar North Atlantic 

      Sørensen, Steffen Aagaard; Husum, Katrine; Werner, Kirstin; Spielhagen, Robert f.; Hald, Morten; Marchitto, Thomas (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
    • Late Holocene pteropod distribution across the base of the south-eastern Mediterranean margin: the importance of the > 63 µm fraction 

      Beccari, Valentina; Almogi-Labin, Ahuva; Basso, Daniela; Panieri, Giuliana; Makovsky, Yizhaq; Hajdas, Irka; Spezzaferri, Silvia (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-17)
      Euthecosomata pteropods were analysed in core sediments collected in the framework of the 2016 EUROFLEETS2 SEMSEEP cruise, offshore of Israel, in the eastern Mediterranean Sea. The investigated cores were retrieved in a deep-sea coral area at 690 m depth, an actively methane-seeping pockmark area at 1038 m depth, and a deep-sea channel area at 1310 m water depth. We identified and documented the ...
    • Late Paleoproterozoic and Mesoproterozoic magmatism of the Nico Pérez Terrane (Uruguay): Tightening up correlations in southwestern Gondwana 

      Oriolo, Sebastián; Oyhantcabal, Pedro; Konopásek, Jiří; Basei, Miguel A.S.; Frei, Robert; Sláma, Jiří; Wemmer, Klaus; Siegesmund, Siegfried (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-04)
      New geochronological, isotopic and geochemical data were obtained from the late Paleoproterozoic and Mesoproterozoic magmatic units of the Nico Pérez Terrane (Uruguay). A U-Pb LA-ICP-MS zircon age of 1768 ± 11 Ma confirms the Statherian age for the Illescas rapakivi intrusion, being thus comparable with the age of the Campanero Unit felsic orthogneisses. Though both the Illescas and Campanero ...
    • Late Pliocene–early Pleistocene deep-sea basin sedimentation at high-latitudes: mega-scale submarine slides of the north-western Barents Sea margin prior to the shelf-edge glaciations 

      Safronova, Polina; Laberg, Jan Sverre; Andreassen, Karin; Shlykova, V.; Vorren, Tore Ola; Chernikov, S. (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-01)
      At high‐latitude continental margins, large‐scale submarine sliding has been an important process for deep‐sea sediment transfer during glacial and interglacial periods. Little is, however, known about the importance of this process prior to the arrival of the ice sheet on the continental shelf. Based on new two‐dimensional seismic data from the NW Barents Sea continental margin, this study documents ...
    • Late Quaternary depositional and glacial history of the Arliss Plateau off the East Siberian margin in the western Arctic Ocean 

      Joe, Young Jin; Polyak, Leonid; Schreck, Michael; Niessen, Frank; Yoon, Seok Hoon; Kong, Gee Soo; Nam, Seung-II (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-19)
      Sedimentary stratigraphy and facies analysis along with seismostratigraphic and multibeam bathymetrydata are used to reconstruct the last glacial impact on the Arliss Plateau (AP) and attendant sedimen-tation in the adjacent Chukchi Basin (CB) in the western Arctic Ocean off the East Siberian margin.Sediment core ARA02B/16B-GC from the AP lower slope captures glacier-related depositional historyduring ...
    • Late Quaternary glacier and sea-ice history of northern Wijdefjorden, Svalbard 

      Allaart, Lis; Müller, Juliane; Schomacker, Anders; Rydningen, Tom Arne; Håkansson, Lena; Kjellman, Sofia Elisabeth; Mollenhauer, Gesine; Forwick, Matthias (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-10)
      The deglaciation history and Holocene environmental evolution of northern Wijdefjorden, Svalbard, are reconstructed using sediment cores and acoustic data (multibeam swath bathymetry and sub‐bottom profiler data). Results reveal that the fjord mouth was deglaciated prior to 14.5±0.3 cal. ka BP and deglaciation occurred stepwise. Biomarker analyses show rapid variations in water temperature and sea ...
    • Late Quaternary paleoceanography of Vestnesa Ridge, Fram Strait: Ostracode species as a potential indicator of cold seep activity 

      Chu, Rachel W.C.; Yasuhara, Moriaki; Myrvang Riise, Karoline; Asahi, Hirofumi; Huang, Huai-Hsuan May; Cotton, Laura J.; Hong, Yuanyuan; Rasmussen, Tine Lander (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-02)
      Past intensity of methane release from deep-ocean methane hydrates continues to be challenging to reconstruct reliably. Here, we used fossil ostracode fauna paired with foraminiferal δ<sup>13</sup>C values in a marine sediment core from Vestnesa Ridge, western Svalbard margin, to reconstruct methane seepage activity during the late Quaternary and to examine faunal response to deglacial climatic ...