Viser treff 21-40 av 1035

    • Near-surface characterization using shear-wave resonances: A case study from offshore Svalbard, Norway 

      Taweesintananon, Kittinat; Rørstadbotnen, Robin Andre; Landrø, Martin; Johansen, Ståle Emil; Arntsen, Børge; Forwick, Matthias; Hansen, Alfred (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-14)
      Shear-wave (S-wave) resonances are typically observed when the surficial marine sediments over a rock substrate have relatively low S-wave velocities. We observe these phenomena using ocean-bottom fiber-optic distributed acoustic sensing (DAS) in two subsea fiber-optic telecommunication cables in Svalbard, Norway. Strong seismic energy from sufficiently large earthquakes is required to trigger and ...
    • Investigating limitations of RAMMS:Debrisflow as a slushflow simulation tool: Using numerical modelling as a tool to predict slushflow runouts 

      Hansen, Vilde Edvardsen (Master thesis; Mastergradsoppgave, 2024-05-30)
      Slushflows are defined as rapid mass movement and occur when water-saturated snow (slush), rapidly moves downslope as a flowlike process. The high-water content of the flow results in high density and mobility flow that poses a significant danger to everything in its path. To predict how slushflows navigates the terrain, numerical modelling is a valuable tool. The output of the simulations would ...
    • Geomorphological study of unstable rock slope deformation on Stáluvárri, Kåfjorden, Troms 

      Nypan, Iver Magnarson (Mastergradsoppgave; Master thesis, 2024-05-15)
      Unstable rock slope failures are catastrophic hazards with a long history in Norway. A large portion of these have been detected within Troms County, with a high percentage of them the Lyngenfjorden fault zone. Stáluvárri, a mountain in Kåfjord commune, is such a slope with detected bodies undergoing slow displacement rates. Bedrock compositions on the slope has abundant mica schists, with a thrust ...
    • The origin and evolution of LCT pegmatites in Helgeland, northern Norway: stable isotope evidence from tourmaline (δ11B) and garnet (δ18O, ∆’17O) 

      Schickhoff, Amelie (Master thesis; Mastergradsoppgave, 2024-06-07)
      The processes leading to formation of rare-element enriched granitic pegmatites are controversially debated amongst petrologists and economic geologists. Two contrasting genetic models discuss the necessity of a parental granitic pluton as the magma source versus an anatectic origin via partial melting of metasedimentary rocks. Geochemical tools such as the analysis of stable isotopic compositions ...
    • Fluid Flow and seafloor gas seepage studies of Tampen Spurr 

      Olayiwola, Isaiah Oluwamayowa (Mastergradsoppgave; Master thesis, 2024-05-16)
      The southern areas of the North Sea are shallow waters with a depth of roughly 50m, which includes the German section, Dutch section, Danish and the UK sector of the North Sea. The north of the North Sea is much deeper but generally less than 200m, except within the Norwegian Trough/Trench towards the northeast, the only region of deep waters. Significant oil and gas discoveries have been made within ...
    • Methanotroph activity and connectivity between two seep systems north off Svalbard 

      de Groot, Tim; Kalenitchenko, Dimitri Stanislas Desire; Moser, Manuel; Argentino, Claudio; Panieri, Giuliana; Dølven, Knut Ola; Ferré, Benedicte; Svenning, Mette Marianne; Niemann, Helge (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-14)
      Understanding methane flux dynamics in Arctic cold seep systems and the influence of oceanic currents on microbial methane-oxidizing bacteria (MOB) is crucial for assessing their impact on Arctic methane emissions. Here, we investigate methane dynamics and associated microbial communities at two cold seep areas, Norskebanken and Hinlopen Trough, North of Svalbard. Methane concentrations and methane ...
    • Snowdrift Analysis using FlowCapt FC4 and LiDAR Data at Fv. 53 Tyin-Årdal 

      Ovesen, Mikael Jay Strand (Mastergradsoppgave; Master thesis, 2024-05-15)
      The wind is essential in distribution of snow and the degree of avalanche danger. There are a lot of uncertainties regarding quantification of wind-transported snow, which is of importance for local avalanche warning and Remote Avalanche Control Systems (RACS) - which is conducted by Skred AS along Fv. 53 (County Road 53) Tyin-Årdal. A snowdrift sensor, FlowCapt 4 (FC4), is installed along this ...
    • Characteristics and failure mechanisms of the Sieidi unstable rock slope 

      Kaltenrieder, Fabrice (Mastergradsoppgave; Master thesis, 2024-05-14)
      Seidi is an unstable rock slope at the western end of the Sørfjord in Tromsø municipality, Troms County, northern Norway. It displays clear signs of rock slope deformation: an offset at the crest, multiple scarps, talus and loose material and a bulging slope. The objective of this work is to interrogate the failure mechanics in order to determine the degree of control lithology and bedrock structure ...
    • A distinctive rare earth element signature for pyrite oxidation and glacial weathering 

      Jang, Kwangchul; Bayon, Germain; Pourret, Olivier; Joe, Young Jin; Kim, Jung-Hyun; Byun, Eunji; Forwick, Matthias; León, Rafael; Nam, Seung-Il (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-15)
      The application of rare earth elements (REE) and neodymium (Nd) isotopes to authigenic Fe-(oxyhydr)oxide phases leached from marine sediments can be used for reconstructing past ocean circulation and chemical weathering patterns on nearby continental landmasses. To explore the behaviour of REE during chemical weathering in glacial environments, we analyzed the authigenic fraction of glacimarine ...
    • Dating and analysis of the Hinlopen Megaslide, northern Svalbard 

      Hooton, Georga-Marie (Mastergradsoppgave; Master thesis, 2024-05-15)
      During a research cruise in the summer of 2022, a number of sediment cores were collected from the main headwall scar area of the Hinlopen Megaslide, northern Svalbard. In this study two of those sediment cores have undergone 14C AMS radiocarbon dating and a multi-proxy analysis to determine an accurate age for the slide deposits in this location. The results have been calibrated using the ...
    • Marine- and Lacustrine Deposition of Eskers 

      Hinrichsen, Teitur (Mastergradsoppgave; Master thesis, 2024-05-16)
      The future stability of modern marine-terminating ice sheets is of great concern as an increased rate of retreat might mark the onset of their collapse. An increased rate of retreat is accompanied by an increase in meltwater and sediment discharge at the ice margin which has prompted research to focus on the drainage system of marine-terminating ice sheets. Recent discoveries of eskers at water-terminating ...
    • A sedimentary insight into the coastal and environmental evolution of Hollendarbukta, Isfjorden: Early Holocene to present 

      Simmons, Luke (Mastergradsoppgave; Master thesis, 2024-05-13)
      Dramatic physical and biological shifts are occurring in the Arctic in response to rising surface air temperatures. Sedimentary coastal environments are particularly sensitive to these changes as they form at the interface between the terrestrial and shallow marine realm. The need to investigate sedimentary archives from coastal environments is crucial, to understand how they have responded during ...
    • Contrasting Methane Seepage Dynamics in the Hola Trough Offshore Norway: Insights From Two Different Summers 

      Ferré, Benedicte; Barreyre, Thibaut; Bünz, Stefan; Argentino, Claudio; Corrales-Guerrero, Jorge; Dølven, Knut Ola; Stetzler, Marie Helene Paula; Fallati, Luca; Sert, Muhammed Fatih; Panieri, Giuliana; Rastrick, Samuel; Kutti, Tina; Moser, Manuel (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-09)
      This study investigates the temporal variations in methane concentration and flare activity in the Hola trough (offshore Norway) during May 2018 and June 2022. Between these time periods, methane seep activity exhibits 3.5 times increase, as evidenced by hydroacoustic measurements. As the seep area in the Hola trough is constantly within the hydrate stability zone, the observed increase cannot be ...
    • NordVulk 1974-2024 

      Schomacker, Anders; Sturkell, Erik; Keiding, Jakob Kløve (Journal article; Tidsskriftartikkel; Peer reviewed, 2024)
      Nordisk Vulkanologisk Institut, senere kendt som Nordisk Vulkanologisk Center (NordVulk), på Island fylder 50 år i 2024. Desværre sammenfalder den runde fødselsdag med, at NordVulk nedlægges. Dermed afsluttes en lang, fremgangsrig og succesfuld æra med nordisk vulkanologisk forskning på Island. Her beretter vi lidt om NordVulks liv.
    • Newly found evidence of the Late Devonian extinction by microtektites in black shales: Sellersburg, Indiana, USA 

      Nedelchev, Emiliyan (Master thesis; Mastergradsoppgave, 2024-05-16)
      Our planet has experienced at least five major mass extinction events, which have occasionally brought the flora and fauna to almost complete collapse , yet they have been pivotal in the evolution of life as we know it. This thesis explores potential causes of mass extinctions, focusing particularly on the Late Devonian mass extinction event, which is the least understood of the major five. Over the ...
    • Seasonal precipitation variability on Svalbard inferred from Holocene sedimentary leaf wax δ2H 

      Kjellman, Sofia Elisabeth; Thomas, Elizabeth K.; Farnsworth, Wesley R.; Cowling, Owen C.; Allaart, Lis; Brynjólfsson, Skafti; Schomacker, Anders (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-26)
      Svalbard spans large climate gradients, associated with atmospheric circulation patterns and variations in ocean heat content and sea ice cover. Future precipitation increases are projected to peak in the northeast and to mainly occur in winter, but uncertainties underscore the need for reconstructions of long-term spatial and temporal variations in precipitation amounts and seasonality. We use lipid ...
    • Morphology and structural, stratigraphic setting of volcanic deposits at Skoll High on the Vøring Plateau 

      Andersen, Rasmus (Mastergradsoppgave; Master thesis, 2024-05-15)
      The voluminous igneous complexes that are present in the sedimentary basins of the volcanic rifted Vøring Margin have recently gained attention due to their promising potential for carbon sequestration. Although there have been major improvements in the field of intra- and subbasalt imaging and subbasalt sequences over the past decade, the emplacement mechanism, stratigraphical setting, structural ...
    • Early aerial expedition photos reveal 85 years of glacier growth and stability in East Antarctica 

      Dømgaard, Mads; Schomacker, Anders; Isaksson, Elisabeth; Millan, Romain; Huiban, Flora; Dehecq, Amaury; Fleischer, Amanda; Moholdt, Geir; Andersen, Jonas K.; Bjørk, Anders A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-25)
      During the last few decades, several sectors in Antarctica have transitioned from glacial mass balance equilibrium to mass loss. In order to determine if recent trends exceed the scale of natural variability, long-term observations are vital. Here we explore the earliest, large-scale, aerial image archive of Antarctica to provide a unique record of 21 outlet glaciers along the coastline of East ...
    • The Ocean Senses Activity Book: Enriching Ocean Literacy through a multisensory approach 

      Panieri, Giuliana; Sancak Sert, Zeynep; Maric, Filip; Poto, Margherita Paola; Murray, Emily Margaret (Chapter; Bokkapittel, 2024-05-23)
      This chapter outlines the development of “The Ocean Senses Activity Book” integrating a multisensory approach to ocean education for pupils and the general public. Originating from an expedition in the Arctic Ocean, the project aimed to cultivate more effective cognitive approaches to ocean literacy education and communication. It bridged the gap between scientific exploration and public engagement, ...
    • The Agenda 2030 and the Imperative for Research and Education for the Climate and the Oceans 

      Panieri, Giuliana; Poto, Margherita Paola; Murray, Emily Margaret (Chapter; Bokkapittel, 2024-05-23)
      This chapter sets the scene and provides background information regarding the primary objective of the book: to contribute to the knowledge base for climate education and research, with a specific focus on the oceans and water. Within this framework, the chapter situates educational and research strategies that specifically focus on ocean literacy, developed and coordinated by the authors over the ...