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Reigstad, Marit; Gerland, Sebastian; Eldevik, Tor; Kunisch, Erin; Wiedmann, Ingrid & Sundfjord, Arild
[Show all 21 contributors for this article]
(2023).
The Nansen Legacy project invites you to its upcoming international symposium in November 2023.
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Christensen, Kai Håkon
(2023).
Orientering om Arven etter Nansen - Presentasjon for Overvåkningsgruppen for norske havområder.
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Simonsen, Magne & Christensen, Kai Håkon
(2023).
Fjord transport and two-way nested models.
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Rabault, Jean; Müller, Malte; Hope, Gaute; Breivik, Øyvind; Nose, Takehiko & Voermans, Joey
[Show all 16 contributors for this article]
(2023).
Collecting Marginal Ice Zone ground truth observations: recent deployments, data use, and outstanding questions.
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Ali, Alfatih; Breivik, Øyvind; Debernard, Jens Boldingh; Christensen, Kai Håkon; Bentsen, Mats & Toniazzo, Thomas
(2022).
MakingWaves: Wave-mediated atmosphere-ocean-sea-ice interactions and their climatic impacts in the Nordic Seas and eastern Arctic.
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Wallhead, Philip; Frigstad, Helene; Staalstrøm, André; Kristiansen, Trond; Gundersen, Hege & Sample, James Edward
[Show all 17 contributors for this article]
(2022).
MARTINI koblet fysisk og biogeokjemisk modellering.
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Østenstad, Petter; Brændshøi, Jostein & Christensen, Kai Håkon
(2021).
Improved representation of vertical (T,S) profiles using real-time assimilation in Arctic waters.
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Løken, Trygve Kvåle; Rabault, Jean; Thomas, Erin E.; Müller, Malte; Christensen, Kai Håkon & Sutherland, Graig
[Show all 7 contributors for this article]
(2020).
A comparison of wave observations in the Arctic marginal ice zone with spectral models.
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Fritzner, Sindre Markus; Christensen, Kai Håkon; Graversen, Rune Grand & Wang, Keguang
(2019).
Assimilation of high-resolution ice charts in a coupled ocean-sea-ice model.
Proceedings IGARSS-97..
doi:
10.1109/IGARSS.2019.8898221.
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Løken, Trygve Kvåle; Rabault, Jean; Jensen, Atle; Sutherland, Graig; Christensen, Kai Håkon & Müller, Malte
(2019).
Wave measurements from ship mounted sensors in the Arctic marginal ice zone.
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Fritzner, Sindre Markus; Christensen, Kai Håkon; Graversen, Rune & Wang, Keguang
(2019).
ASSIMILATION OF HIGH-RESOLUTION ICE CHARTS IN A COUPLED OCEAN-SEA-ICE MODEL.
Full text in Research Archive
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Løken, Trygve Kvåle; Rabault, Jean; Jensen, Atle; Christensen, Kai Håkon & Müller, Malte
(2019).
Wave statistics from ship mounted sensors in the marginal ice zone.
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Christensen, Kai Håkon
(2018).
Short term predictions of oceanic drift.
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Christensen, Kai Håkon
(2018).
The importance of wave-current interactions in operational oceanography.
Show summary
The purpose of ocean circulation models in an operational setting is typically to provide support for oil spill mitigation, search-and-rescue, ship routing, offshore operations, and so on. Focus is therefore primarily on the dynamics of the upper ocean. Surface waves play an important role with regard to turbulent mixing and modification of upper ocean drift velocities through wave-current interactions. The latter is particularly important, and the wave-induced component of the drift of oil spills or other bouyant materials is often dominant. Furthermore, since the waves influence the air-sea fluxes of momentum and energy, the upper ocean response to transient atmospheric forcing is tightly coupled to the waves, and this coupling must be taken into account in the forecasting systems in order to correctly model the currents in the Ekman layer. We still lack observations to validate several aspects of wave-current interaction theory, but some progress has been made using autonomous instrument platforms and in dedicated campaigns where a wide range of sensors have been deployed. I will show some examples from the field, and also examples from modeling studies of oceanic drift in which wave effects have been taken into account. I will also comment on a few outstanding challenges from both an observational and modeling perspective.
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Ali, Alfatih Omer Mohammed Ahmed; Christensen, Kai Håkon; Breivik, Øyvind; Bertino, Laurent & Raj, Roshin Pappukutty
(2018).
Assessing the impact of surface waves on the North Atlantic and Nordic Seas simulations using HYCOM.
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Christensen, Kai Håkon; Sperrevik, Ann Kristin & Brostrøm, Gøran
(2017).
The circulation in the Kattegat and Skagerrak.
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Christensen, Kai Håkon
(2017).
The impact of surfactants on surface waves.
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Röhrs, Johannes & Christensen, Kai Håkon
(2017).
Drift in the uppermost part of the ocean - 5th Norway-Scotland wave symposium 2017.
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Carrasco, Ana; Semedo, Alvaro; Behrens, Arno; Weisse, Ralf; Breivik, Øyvind & Sætra, Øyvind
[Show all 7 contributors for this article]
(2016).
Projected Changes on the Global Surface Wave Drift Climate towards the END of the Twenty-First Century.
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Christensen, Kai Håkon; Breivik, Øyvind; Sutherland, Graigory John; Gargett, Ann; Ward, Brian & Belcher, Stephen
(2016).
A robust definition for the turbulent Langmuir number.
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Brodtkorb, André R.; Christensen, Kai Håkon; Røed, Lars Petter & Sætra, Martin Lilleeng
(2016).
Using the GPU to Predict Drift in the Ocean.
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Röhrs, Johannes & Christensen, Kai Håkon
(2016).
Wind- and wave induced drift in the uppermost part of the ocean.
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Weber, Jan Erik H. & Christensen, Kai Håkon
(2016).
Mean particle drift in long gravity waves at the interface between immiscible viscous fluids.
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Ward, Brian; Sutherland, Graigory John; Reverdin, Gilles; Marie, Luois; Christensen, Kai Håkon & Brostrøm, Gøran
[Show all 8 contributors for this article]
(2015).
Ocean Surface Observations of the Diurnal Cycle of Turbulence with ASIP.
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Sperrevik, Ann Kristin; Christensen, Kai Håkon & Röhrs, Johannes
(2014).
ASSIMILATION OF HF RADAR CURRENTS IN AN EDDY RESOLVING MODEL.
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Röhrs, Johannes; Sundby, Svein; Vikebø, Frode Bendiksen & Christensen, Kai Håkon
(2014).
SURFACE GRAVITY WAVES TRANSPORTING PELAGIC FISH EGGS: STOKES DRIFT AND VERTICAL MIXING.
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Sutherland, Graigory John; Ward, Brian & Christensen, Kai Håkon
(2014).
EVALUATING TURBULENCE REGIMES IN THE OCEAN SURFACE BOUNDARY LAYER: MEASUREMENTS FROM A VERTICALLY RISING MICROSTRUCTURE PROFILER.
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Drivdal, Magnus Bjørn; Brostrøm, Gøran & Christensen, Kai Håkon
(2014).
Wave induced transport and mixing of buoyant particles.
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Brostrøm, Gøran; Drivdal, Magnus Bjørn; Carrasco, Ana; Christensen, Kai Håkon & Mattson, Johan
(2014).
The Golden Trader oil spill; evaluation of operational oil spill models.
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Christensen, Kai Håkon
(2013).
Wave/mean flow-interactions in ocean models with time varying vertical coordinates.
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Weber, Jan Erik H.; Christensen, Kai Håkon & Broström, Göran
(2013).
Stokes drift in internal equatorial Kelvin waves.
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Röhrs, Johannes; Christensen, Kai Håkon; Hole, Lars R; Brostrøm, Gøran; Drivdal, Magnus Bjørn & Sundby, Svein
(2012).
Observations of surface wave effects and impacts on drifter trajectories.
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Christensen, Kai Håkon; Röhrs, Johannes; Ward, Brian; Drivdal, Magnus Bjørn & Brostrøm, Gøran
(2012).
Surface wave measurements using ship-mounted ultrasonic altimeter.
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Brostrøm, Gøran; Christensen, Kai Håkon & Weber, Jan Erik H.
(2008).
How to include surfaces waves in an ocean model.
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Albretsen, Jon; Arneberg, Per; Assmann, Karen; Assmy, Philipp; Bohlin-Nizzetto, Pernilla & Børsheim, Knut Yngve
[Show all 49 contributors for this article]
(2023).
Status for miljøet i norske havområder - Rapport fra Overvåkingsgruppen 2023.
Havforskningsinstituttet.
ISSN 1893-4536.
Full text in Research Archive
Show summary
I denne rapporten gir Overvåkingsgruppen, for første gang, en felles vurdering av miljøtilstanden i Barentshavet og havområdene utenfor Lofoten, Norskehavet og Nordsjøen med Skagerrak. Det er også første rapport som bruker resultater fra det nylig utviklede fagsystemet for vurdering av økologisk tilstand. I denne rapporten dekkes to hovedtemaer: (1) Dominerende trekk i status og utvikling i økosystemet i alle tre havområdene, basert på vurderingene av økologisk tilstand, Overvåkingsgruppens rapport om forurensning fra 2022, indikatorer fra Overvåkingsgruppen som ikke er dekket under vurdering av økologisk tilstand, samt rapporter og annen relevant informasjon fra forskning, og (2) en vurdering av karbonbinding i marint plankton, marine vegetasjonstyper og marine sedimenter. I tillegg er det gitt en oppsummering for endringer i ytre påvirkning, vurdering av kunnskapsbehov samt en vurdering av indikatorverdier i forhold til referanseverdier og tiltaksgrenser. Vurderingen av dominerende trekk i utvikling og tilstand av miljøet som er gitt i kapittel 2, utgjør Overvåkingsgruppens bidrag til Faglig forums samlerapport om det faglige grunnlaget for revisjon og oppdatering av de helhetlige forvaltningsplanene for norske havområder.
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