Now showing items 207-226 of 316

    • Palaeoceanographic and environmental changes in the eastern Fram Strait during the last 14,000 years based on benthic and planktonic foraminifera 

      Consolaro, Chiara; Rasmussen, Tine Lander; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-14)
      Benthic and planktonic foraminifera, stable isotopes and other geochemical and sedimentological parameters have been investigated in a sediment core from Vestnesa Ridge (79°N, NW Svalbard margin, 1300 m water depth) in order to reconstruct the palaeoceanographic and palaeoenvironmental evolution of the eastern Fram Strait during the last 14,000 years. Our multiproxy data and, in particular, our ...
    • Palaeoceanographic reconstruction of surface-ocean changes in the southern Norwegian Sea for the last ~130,000 years based on diatoms and with comparison to foraminiferal records 

      Hoff, Ulrike; Rasmussen, Tine Lander; Meyer, Hanno; Koc, Nalan; Hansen, Jesper (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-28)
      Fossil marine diatom assemblages in a sediment core from the central northern Faroe slope in the Norwegian Sea were used to reconstruct palaeoceanographic changes in the surface water mixed layer from the last ~130,000 years (Marine Isotope Stage (MIS) 6/5 transition to MIS 1 (including the Eemian and Holocene interglacials) and to compare the results with previously published results on planktic ...
    • Palaeoceanography of the Barents Sea continental margin, north of Nordaustlandet, Svalbard, during the last 74 ka 

      Chauhan, Teena; Rasmussen, Tine Lander; Noormets, Riko (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-07-17)
      We investigated gravity core HH11‐09GC from 488 m water depth at the northern Svalbard margin in order to reconstruct changes in Atlantic Water (AW) inflow to the Arctic Ocean. The study was based on the distribution patterns of benthic and planktic foraminifera, benthic and planktic oxygen and carbon isotopes, lithology and physical properties of the sediments. The core contains sediments from ...
    • Paleo-methane emissions recorded in foraminifera near the landward limit of the gas hydrate stability zone offshore western Svalbard 

      Panieri, Giuliana; Graves, Carolyn; James, Rachel (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-26)
      We present stable isotope and geochemical data from four sediment cores from west of Prins Karls Forland (ca. 340 m water depth), offshore western Svalbard, recovered from close to sites of active methane seepage, as well as from shallower water depths where methane seepage is not presently observed. Our analyses provide insight into the record of methane seepage in an area where ongoing ocean ...
    • Paleoceanographic development in Storfjorden, Svalbard, during the deglaciation and Holocene: evidence from benthic foraminiferal records 

      Rasmussen, Tine Lander; Thomsen, Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-08-07)
      Brines can have a profound influence on the relative abundance of calcareous and agglutinated foraminiferal faunas. Here we investigated the distribution of benthic foraminiferal species in four cores from a brine‐enriched environment in Storfjorden, Svalbard. Stratigraphically, the cores comprise the last 15 000 years. The purpose of the study was to reconstruct changes in the palaeoecology and ...
    • Particle sources and downward fluxes in the eastern Fram strait under the influence of the west Spitsbergen current 

      Sanchez-Vidal, Anna; Veres, Oriol; Langone, Leonardo; Ferré, Benedicte; Calafat, Antoni; Canals, Miquel; Durrieu de Madron, Xavier; Heussner, Serge; Mienert, Jurgen; Grimalt, Joan O.; Pusceddu, Antonio; Danovaro, Roberto (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-06-10)
      <p>The carbon cycle of the Arctic Ocean is tightly regulated by land–atmosphere–cryosphere–ocean interactions. Characterizing these environmental exchanges and feedbacks is critical to facilitate projections of the carbon cycle under changing climate conditions. The environmental drivers of sinking particles including organic carbon (OC) to the deep-sea floor are investigated with four moorings ...
    • The Permafrost Young Researchers Network (PYRN) is getting older – the past, present, and future of our evolving community 

      Tanski, George; Bergstedt, Helena; Bevington, Alexandre; Bonnaventure, Philip; Bouchard, Frédéric; Coch, Caroline; Dumais, Simon; Evgrafova, Alvetina; Frauenfeld, Oliver; Frederick, Jennifer; Fritz, Michael; Frolov, Denis; Harder, Silvie; Hartmeyer, Ingo; Heslop, Joanne; Högström, Elin; Johansson, Margareta; Kraev, Gleb; Kuznetsova, Elena; Lenz, Josefine; Lupachev, Alexey; Magnin, Florence; Martens, Jannik; Maslakov, Alexey; Morgenstern, Anne; Nieuwendam, Alexandre; Oliva, Marc; Radosavljevic, Boris; Ramage, Justine; Schneider, Andrea; Stanilovskaya, Julia; Strauss, Jens; Trochim, Erin; Vecellio, Daniel; Weber, Samuel; Lantuit, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-07)
      A lasting legacy of the International Polar Year (IPY) 2007–2008 was the promotion of the Permafrost Young Researchers Network (PYRN), initially an IPY outreach and education activity by the International Permafrost Association (IPA). With the momentum of IPY, PYRN developed into a thriving network that still connects young permafrost scientists, engineers, and researchers from other disciplines. ...
    • Petroleum, coal and research drilling onshore Svalbard: a historical perspective 

      Senger, Kim; Brugmans, Peter; Grundvåg, Sten-Andreas; Jochmann, Malte Michel; Nøttvedt, Arvid; Olaussen, Snorre; Skotte, Asbjørn; Smyrak-Sikora, Aleksandra (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-05)
      The beginning of the Norwegian oil industry is often attributed to the first exploration drilling in the North Sea in 1966, the first discovery in 1967 and the discovery of the supergiant Ekofisk field in 1969. However, petroleum exploration already started onshore Svalbard in 1960 with three mapping groups from Caltex and exploration efforts by the Dutch company Bataaffse (Shell) and the Norwegian ...
    • Physical Conditions of Fast Glacier Flow: 1. Measurements From Boreholes Drilled to the Bed of Store Glacier, West Greenland 

      Doyle, S. H.; Hubbard, B.; Christoffersen, P.; Young, T.J.; Hofstede, C; Bougamont, M.; Box, J.E.; Hubbard, A.L. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-21)
      Marine‐terminating outlet glaciers of the Greenland Ice Sheet make significant contributions to global sea level rise, yet the conditions that facilitate their fast flow remain poorly constrained owing to a paucity of data. We drilled and instrumented seven boreholes on Store Glacier, Greenland, to monitor subglacial water pressure, temperature, electrical conductivity, and turbidity along with ...
    • Physical Conditions of Fast Glacier Flow: 2. Variable Extent of Anisotropic Ice and Soft Basal Sediment From Seismic Reflection Data Acquired on Store Glacier, West Greenland 

      Hofstede, C.; Christoffersen, P.; Hubbard, B.; Doyle, S.H.; Young, T.J.; Diez, A.; Eisen, O.; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-09)
      Outlet glaciers of the Greenland Ice Sheet transport ice from the interior to the ocean and contribute directly to sea level rise because discharge and ablation often exceed the accumulation. To develop a better understanding of these fast‐flowing glaciers, we investigate the basal conditions of Store Glacier, a large outlet glacier flowing into Uummannaq Fjord in west Greenland. We use two crossing ...
    • Physical Conditions of Fast Glacier Flow: 3.Seasonally-Evolving Ice Deformation onStore Glacier, West Greenland 

      Young, Tun Jan; Christoffersen, Poul; Doyle, Samuel H.; Nicholls, Keith W.; Stewart, C.L.; Hubbard, Bryn; Hubbard, Alun Lloyd; Lok, Lai B.; Brennan, Paul V.; Benn, Douglas I; Luckman, Adrian; Bougamont, Marion H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-08)
      Temporal variations in ice sheet flow directly impact the internal structure within ice sheetsthrough englacial deformation. Large-scale changes in the vertical stratigraphy within ice sheets havebeen previously conducted on centennial to millennial timescales; however, intra-annual changes inthe morphology of internal layers have yet to be explored. Over a period of 2 years, we use autonomousphas ...
    • Pica and refractory iron deficiency anaemia : a case report. 

      Stunitz, Holger; von Garnier, Christophe; Decker, Michael; Battegay, Edouard; Zeller, Andreas (Journal article; Tidsskriftartikkel, 2008)
    • Pink marine sediments reveal rapid ice melt and Arctic meltwater discharge during Dansgaard-Oeschger warmings 

      Rasmussen, Tine Lander; Thomsen, Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-11-22)
      The climate of the last glaciation was interrupted by numerous abrupt temperature fluctuations, referred to as Greenland interstadials and stadials. During warm interstadials the meridional overturning circulation was active transferring heat to the north, whereas during cold stadials the Nordic Seas were ice-covered and the overturning circulation was disrupted. Meltwater discharge, from ice sheets ...
    • Polyphase kinematic history of transpression along the Mecca Hills segment of the San Andreas fault, southern California 

      Bergh, Steffen G; Sylvester, Arthur G.; Damte, Alula; Indrevær, Kjetil (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-09)
      Miocene–Pliocene sedimentary rocks in the Mecca Hills, southern California, were uplifted and deformed by transpression along a restraining bend in the San Andreas fault trace between the Orocopia and San Bernardino Mountains in Pleistocene time. This paper presents field evidence for three stages of structural evolution of a complex, asymmetric wedge-like flower structure, expressed as: (1) ...
    • Porphyry Cu mineralization related to the small Tertiary volcanic intrusions in the Bučim ore deposit, Eastern Macedonia 

      Serafimovski, Todor; Tasev, Goran; Strmic Palinkas, Sabina; Palinkas, Ladislav; Gjorgjiev, Lazar (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-29)
      The paper presents data about the geology, geochemistry, structure, genesis and specific features of the Bučim porphyry Cu deposit which is actively mined in Macedonia. The porphyry mineralization (0.3 % Cu, 0.3-0.5 ppm Au) is spatially and temporarily associated with Tertiary subvolcanic intrusions of latitic and latitic-andesitic composition. The intrusions occurred during Oligo-Miocene time ...
    • Position, swimming direction and group size of fin whales (Balaenoptera physalus) in the presence of a fast-ferry in the Bay of Biscay 

      Aniceto, Ana Sofia Albuquerque Lima; Carroll, JoLynn; Tetley, Michael J; van Oosterhout, Cock (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-12)
      We analyze group size, swimming direction and the orientation of fin whales relative to a fast ferry in the Bay of Biscay. Fin whale groups (≥3 individuals) were on average closer to the vessel than single individuals and pairs (F1,114 = 4.94, p = 0.028) and were more often observed within a high-risk angle ahead of the ferry (binomial probability: p = 7.60 × 10−11). Also, small groups tend to swim ...
    • Possible climate preconditioning on submarine landslides along a convergent margin, Nankai Trough (NE Pacific) 

      Kremer, Katrina; Usman, Muhammed; Satoguchi, Yasufumi; Nagahashi, Yoshitaka; Vadakkepuliyambatta, Sunil; Panieri, Giuliana; Strasser, Michael (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-25)
      Submarine landslides are major agents of sediment mass transfer from the shallow to deep sea. Due to their rapid emplacement and tsunamigenic potential, such landslides are significant geohazards for society and off- and on-shore infrastructure. The relationship between climate change and the occurrence of submarine landslides is widely debated. However, there is a lack of continuous long-term ...
    • Postglacial relative sea level change and glacier activity in the early and late Holocene: Wahlenbergfjorden, Nordaustlandet, Svalbard 

      Schomacker, Anders; Farnsworth, Wesley R.; Ingólfsson, Ólafur; Allaart, Lis; Håkansson, Lena; Retelle, Michael; Marie-Louise, Siggaard-Andersen; Korsgaard, Niels J.; Rouillard, Alexandra; Kjellman, Sofia Elisabeth (Journal article; Peer reviewed, 2019-05-01)
      Sediment cores from Kløverbladvatna, a threshold lake in Wahlenbergfjorden, Nordaustlandet, Svalbard were used to reconstruct Holocene glacier fluctuations. Meltwater from Etonbreen spills over a threshold to the lake, only when the glacier is significantly larger than at present. Lithological logging, loss-on-ignition, ITRAX scanning and radiocarbon dating of the cores show that Kløverbladvatna ...
    • Postglacial response of Arctic Ocean gas hydrates to climatic amelioration 

      Serov, Pavel; Vadakkepuliyambatta, Sunil; Mienert, Jurgen; Patton, Henry; Portnov, Aleksei D; Silyakova, Anna; Panieri, Giuliana; Carroll, Michael Leslie; Carroll, JoLynn; Andreassen, Karin; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-05)
      Seafloor methane release due to the thermal dissociation of gas hydrates is pervasive across the continental margins of the Arctic Ocean. Furthermore, there is increasing awareness that shallow hydrate-related methane seeps have appeared due to enhanced warming of Arctic Ocean bottom water during the last century. Although it has been argued that a gas hydrate gun could trigger abrupt climate ...
    • Production of fluorescent dissolved organic matter in Arctic Ocean sediments 

      Chen, Meilian; Kim, Ji-Hoon; Nam, Seung-Il; Niessen, Frank; Hong, Wei-Li; Kang, Moo-Hee; Hur, Jin (Journal article; Tidsskriftartikkel; Peer reviewed, 2016)
      Little is known about the production of fluorescent dissolved organic matter (FDOM) in the anoxic oceanic sediments. In this study, sediment pore waters were sampled from four different sites in the Chukchi-East Siberian Seas area to examine the bulk dissolved organic carbon (DOC) and their optical properties. The production of FDOM, coupled with the increase of nutrients, was observed above the ...