Browsing Institutt for geofag by Title
Now showing items 1851-1870 of 3035
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Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)Marine Isotope Stage 31 (MIS31, between 1085 and 1055 ka) was characterized by higher extratropical air temperatures and a substantial recession of polar glaciers compared to today. Paleoreconstructions and model simulations ...
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(Master thesis / Masteroppgave, 2008)In this thesis the aim was to investigate the largely unknown potential of coals of the Tettegras Fm. (Billefjord Gr.) in two wells from the Finnmark Platform and to evaluate the generation and expulsion properties of these ...
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(Doctoral thesis / Doktoravhandling, 2015)This dissertation investigates the physical structure of the crust and upper mantle in southwestern Scandinavia using different seismological and non-seismologic geophysical methods: 1. The S-wave velocity structure of ...
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Olivine Grain Size Distributions in Faults and Shear Zones: Evidence for Nonsteady State Deformation (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)The grain size distribution of deformed rocks may provide valuable information about their deformation history and the associated mechanisms. Here we present a unique set of olivine grain size distributions from ultramafic ...
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(Master thesis / Hovedoppgave, 1972)In this work we have examined the baroclinic instability in a linear two layer model, where the perturbations are presume to depend the latitude. From the linear equations we have computed the growthrates and speeds of ...
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(Doctoral thesis / Doktoravhandling, 2016)
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Diurnal continental shelf waves (CSWs) are studied theoretically for an idealized shelf topography. Wave attenuation is caused by the exchange of fluid on the sloping shelf with an inner region through a permeable coastline. ...
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(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)Global climate change and reservoir regulations can alter the natural flow of rivers. Influenced by these two drivers, flood sequences may no longer satisfy the assumption of stationary, thereby making it difficult to ...
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On Pole Position: Causes of Dispersion of the Paleomagnetic Poles Behind Apparent Polar Wander Paths (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Paleomagnetic poles used to compute apparent polar wander paths (APWPs) are strongly dispersed, which was recently shown to cause a large fraction (>50%) of these poles to be statistically distinct from the APWP to which ...
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(Research report / Forskningsrapport, 1969)
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On the Additivity of Climate Responses to the Volcanic and Solar Forcing in the Early 19th Century (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)The early 19th century was the coldest period over the past 500 years, when strong tropical volcanic events and a solar minimum coincided. The 1809 unidentified eruption and the 1815 Tambora eruption happened consecutively ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)The transfer of mean momentum from surface gravity waves to Eulerian mean fluxes is investigated by modeling the total wave momentum (the Stokes flux) as a thin surface layer moving with the phase speed c of the waves and ...
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(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)Given a changing environment, estimating a flood magnitude corresponding to a desired return period considering nonstationarity is crucial for hydrological engineering designs. Four nonstationary design methods, namely ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)Chaotic intrinsic variability is a fundamental driver of the oceanic variability. Its understanding is key to interpret observations, evaluate numerical models, and predict the future ocean and climate. Here we study ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)The geoscience community is increasingly utilizing seismic tomography to interpret mantle heterogeneity and its links to past tectonic and geodynamic processes. To assess the robustness and distribution of positive seismic ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)The coupling between surface waves and the motion in a flexible porous surface layer is investigated theoretically. We apply a Lagrangian formulation for the viscous fluid and the fluid-saturated porous medium. In the ...
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(Master thesis / Masteroppgave, 2005)Abstract Debris flows represent a major threat to human life and property. Due to their ability of entraining material and reaching long run-outs, they have a potential of causing massive damage. There are many studies ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Although central to an understanding of Earth's paleogeography and the myriad processes that it affects, the geometry of Pangea during the early phase of its lifetime has remained a topic of contention since the plate ...
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(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2012)Due to the increasing popularity of analyzing empirical Green’s functions obtained from ambient seismic noise, more and more regional tomographical studies based on short-period surface waves are published. Results could ...
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(Master thesis / Masteroppgave, 2023)