Browsing Institutt for geofag by Author "Isachsen, Pål Erik"
Now showing items 1-13 of 13
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Heiskanen, Tuomas Ilkka Henrikki; Graversen, Rune Grand; Rydsaa, Johanne Hope; Isachsen, Pål Erik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)The Arctic region shows some of the world's most significant signs of climate change; for instance, a negative trend in summer sea‐ice cover of around 15% per decade and Arctic amplified surface‐air warming that is three ...
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Critical role of continental slopes in halocline and eddy dynamics of the Ekman-driven Beaufort Gyre Manucharyan, Georgy; Isachsen, Pål Erik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)The Beaufort Gyre (BG) is a large‐scale bathymetrically constrained circulation driven by a surface Ekman convergence that creates a bowl‐shaped halocline and stores a significant portion of the Arctic Ocean's freshwater. ...
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Hattermann, Tore; Isachsen, Pål Erik; von Appen, Wilken-Jon; Albretsen, Jon; Sundfjord, Arild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)Eddy‐resolving regional ocean model results in conjunction with synthetic float trajectories and observations provide new insights into the recirculation of the Atlantic Water (AW) in Fram Strait that significantly impacts ...
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Weber, Jan Erik H.; Isachsen, Pål Erik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)We consider barotropic coastally-trapped Kelvin waves of tidal origin along a straight coast that propagate from deeper water across a transverse bottom escarpment into a more shallow region. The component, which has a ...
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Meneghello, Gianluca; Marshall, John; Lique, Camille; Isachsen, Pål Erik; Doddridge, Edward; Campin, Jean-Michel; Regan, Heather; Talandier, Claude (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Abstract Observations of ocean currents in the Arctic interior show a curious, and hitherto unexplained, vertical and temporal distribution of mesoscale activity. A marked seasonal cycle is found close to the surface: ...
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Espenes, Håvard; Isachsen, Pål Erik; Nøst, Ole Anders (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Abstract. We investigate data from an acoustic Doppler current profiler deployed in a constricted ocean channel showing a tidally dominated flow with intermittent velocity extrema during outflow from the constriction but ...
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Waldman, Robin; Somot, Samuel; Herrmann, Marine; Sevault, Florence; Isachsen, Pål Erik (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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Brown, Nicola; Mauritzen, Cecilie; Li, Camille; Madonna, Erica; Isachsen, Pål Erik; Lacasce, Joseph Henry (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Abstract We explore drivers of variability in the Norwegian Atlantic Slope Current, which carries relatively warm Atlantic Water towards the Barents Sea and Arctic Ocean, using CMEMS satellite altimetry data and TOPAZ4 ...
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Børve, Eli; Isachsen, Pål Erik; Nøst, Ole Anders (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Vestfjorden in northern Norway, a major spawning ground for the northeast Arctic cod, is sheltered from the continental shelf and open ocean by the Lofoten–Vesterålen archipelago. The archipelago, however, is well known ...
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The influence of topography on the stability of the Norwegian Atlantic Current off Northern Norway Ghaffari, Peygham; Isachsen, Pål Erik; Nøst, Ole Anders; Weber, Jan Erik H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)The steep continental slope off the Lofoten–Vesterålen islands of northern Norway appears to be the source of the most intense mesoscale eddy field in all of the Nordic Seas. Here we use linearized two-layer shallow-water ...
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Dugstad, Johannes Sandanger; Isachsen, Pål Erik; Fer, Ilker (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Abstract. Warm Atlantic-origin waters are modified in the Lofoten Basin in the Nordic Seas on their way toward the Arctic. An energetic eddy field redistributes these waters in the basin. Retained for extended periods, the ...
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Trodahl, Marta; Isachsen, Pål Erik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)Weakly stratified layers over sloping topography can support a submesoscale baroclinic instability mode, a bottom boundary layer counterpart to surface mixed layer instabilities. The instability results from the release ...
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Dugstad, Johannes Sandanger; Kozalka, Inga Monika; Isachsen, Pål Erik; Dagestad, Knut-Frode; Fer, Ilker (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)The Lofoten Basin in the eastern Nordic Seas plays a central role in modifying the warm Atlantic Water inflow toward the Arctic Ocean. Here, the Atlantic Water experiences increased residence times, cooling, and substantial ...