English
norskArtikler, rapporter og annet (geovitenskap): Nye registreringer
Viser treff 1-20 av 756
-
BFR2: a curated ribosomal reference dataset for benthic foraminifera
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-27)Benthic foraminifera are one of the major groups of marine protists that also occur in freshwater and terrestrial habitats. They are widely used to monitor current and past environmental conditions. Over the last three decades, thousands of DNA sequences have been obtained from benthic foraminiferal isolates. The results of this long-term effort are compiled here in the form of the first curated ... -
A Sequential Leaching Protocol for δ11B and Trace Element Analyses of Multi-Phase Carbonate Rocks
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-22)Boron geochemistry from biogenic carbonates offer valuable information about ocean pH and CO<sub>2</sub> chemistry. However, application to geological carbonate deposits suffers from analytical difficulties in obtaining geochemical signals exclusively from the carbonate phase. Sequential leaching with reagents and acids has the potential to overcome such an issue. There is, however, little systematic ... -
Editorial: Natural methane emissions in a changing arctic – implications for climate and environment
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-23)Natural methane emissions have received significant attention in recent years due to the documented increase in atmospheric concentrations of methane and its elevated global warming potential relative to CO2. Over the past decades, the Arctic has been warming nearly four times faster than the rest of the planet (Rantanen et al., 2022). Arctic amplification of global warming drives a pressing need ... -
Cambrian-Ordovician trace fossils of the Basissletta region, northeast Spitsbergen, Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-29)Trace fossils of the Cambrian–Ordovician sedimentary succession of the Basissletta region, northeast Spitsbergen, Svalbard, belong to three ichnoassemblages. The first one, composed of Monocraterion and Diplocraterion, belongs to the Skolithos ichnofacies and characterises sandstones of the Tokammane Formation (lower Cambrian: Terreneuvian) deposited in a shallow subtidal setting. The overlying ... -
Motivation for slushflow classification
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)Slushflows are a type of rapid mass movement where water saturated snow flows downhill. Slushflows come in many different sizes, have different triggering mechanisms, and contain debris ranging from simply snow and ice to soil, rock and vegetation. Slushflows are often misclassified as debris flows, wet snow avalanches or river/stream ice jam processes. <p> <p>Norway reports 5 to 20 larger ... -
Limitations of RAMMS:Debrisflow as a slushflow simulation tool
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)Slushflows are defined as water-saturated snow (slush), that moves rapidly downslope as a gravitational mass flow. The high-water content of the flow results in a high density, posing a significant danger to construction, infrastructure and people in its path. To reduce this danger, it is important to predict where slushflows may initiate and travel in the terrain. Numerical modelling of the runout ... -
Building resilience to avalanches and other climate-driven geohazards through international collaboration in education: experience from the GEOMME partnership
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)The GEOMME international partnership for ‘Climate-driven GEOhazards Mitigation, Management, and Education’ fosters collaboration in research and education on climate-driven geohazards across South Korea, Japan, and Norway. The initiative focuses on enhancing societal resilience against gravitational mass flows through excellence in education and research, aiming to improve the adaptive capacities ... -
Neogene - Quaternary evolution of the northeastern Fram gateway, European Arctic
(Conference object; Konferansebidrag, 2024-10) -
Arctic freshwater outflow suppressed Nordic Seas overturning and oceanic heat transport during the Last Interglacial
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-27)The Last Interglacial period (LIG) was characterized by a long-term Arctic atmospheric warming above the preindustrial level. The LIG thus provides a case study of Arctic feedback mechanisms of the cryosphere-ocean circulation-climate system under warm climatic conditions. Previous studies suggested a delay in the LIG peak warming in the North Atlantic compared to the Southern Ocean and evoked the ... -
Integrating ROV MBES and photogrammetry data for comprehensive mapping of cold seep systems at Hakon Mosby Mud Volcano (HMMV) in the Barents Sea
(Conference object; Konferansebidrag, 2024-07) -
Major tunnel valleys and sedimentation changes document extensive Early Pleistocene glaciations of the Barents Sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-02)Sedimentary records of Early Pleistocene (~2.6–0.8 Ma) glaciations are sparse on shelves, yet trough mouth fans on adjacent continental slopes provide a continuous record of ice-sheet and climate development throughout the Quaternary. Here, we interpret high-quality 3D seismic reflection data combined with borehole and chronostratigraphic information from a shelf-slope setting in the southwestern ... -
Pliocene-Pleistocene warm-water incursions and water mass changes on the Ross Sea continental shelf (Antarctica) based on foraminifera from IODP Expedition 374
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-11)International Ocean Discovery Program (IODP) Expedition 374 sailed to the Ross Sea in 2018 to reconstruct paleoenvironments, track the history of key water masses, and assess model simulations that show warm-water incursions from the Southern Ocean led to the loss of marine-based Antarctic ice sheets during past interglacials. IODP Site U1523 (water depth 828 m) is located at the continental shelf ... -
Some issues related to the Svalbardian tectonic event (Ellesmerian Orogeny) in Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-23)Svalbard has long been thought to represent the easternmost realm of the Ellesmerian Orogeny in the late Devonian or early Mississippian (Svalbardian tectonic event). Several authors do not agree and present alternative interpretations of the observed structures in older and more recent articles. This article discusses a number of issues that, in our opinion, are not sufficiently considered in ... -
Metallogenic model of the Lykling ophiolite-hosted lode Au deposit, Scandinavian Caledonides: Insight from fluid inclusions, mineral chemistry and stable isotope geochemistry
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-10)The Lykling lode Au deposit represents a unique example of gold mineralization in the Upper Allochthone of the Scandinavian Caledonides. The mineralization is hosted by the Early Ordovician Lykling Ophiolite Complex and the intruding trondhjemite unit and spatially associated with two generations of mafic dykes that crosscut both the ophiolitic complex and trondhjemite. Field observations indicate ... -
Variations in deep-sea methane seepage linked to millennial-scale changes in bottom water temperatures ~ 50–6 ka, NW Svalbard margin
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-27)During the last glaciation, the northern hemisphere experienced profound millennial-scale changes (termed Dansgaard-Oeschger (DO) events) in atmospheric and oceanic temperatures. In the North Atlantic, the fluctuations resulted in extremely unstable bottom water conditions with bottom water temperatures (BWT) varying up to > 5 °C. We have studied these changes in a core from 1,300 m water depth ... -
Tulvat ja tulvasuojelu: esimerkkinä pohjalaismaakuntien kevät 2024
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-17) -
Glacial erosion and quaternary landscape development of the Eurasian Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-19)Multiple ice age cycles spanning the last three million years have fundamentally transformed the Arctic landscape. The cadence, intensity and pattern of this glacial modification underpin the stability of Arctic geosystems over geologic time scales, including its hydrology, circulation patterns, slope stability, hydrocarbon fluid flow, geochemical/sediment cycling and nutrient supply. The Barents ... -
Mechanical Impact of Heterogeneously Distributed H2O on Quartz Deformation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-31)In order to identify relations between mechanical behavior, deformation mechanisms, microstructural properties, and H<sub>2</sub>O distribution, Tana‐quartzite samples with added H<sub>2</sub>O ranging from 0 to 0.5 wt.% were deformed by axial shortening at constant displacement rates, at 900°C and 1 GPa, reaching up to ∼30% bulk strain. Samples with lower quantities of added H<sub>2</sub>O (0.1 ... -
Deep learning models for regional phase detection on seismic stations in Northern Europe and the European Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-23)Seismic phase detection and classification using deep learning is so far poorly investigated for regional events since most studies focus on local events and short time windows as the input to the detection models. To evaluate deep learning on regional seismic records, we create a data set of events in Northern Europe and the European Arctic. This data set consists of about 151 000 three component ... -
Weichselian–Holocene glacial history of the Sjuøyane archipelago, northern Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-05)The Sjuøyane archipelago is the northernmost land area of Svalbard; thus, it provides a window to study the terrestrial glacial history and dynamics of the Svalbard–Barents Sea Ice Sheet and complement marine geological studies in the region. To reconstruct the glacial history of Sjuøyane, we describe coastal sedimentary sections in Quaternary sediments and constrain their chronology by radiocarbon ...
