• Data assimilation as a learning tool to infer ordinary differential equation representations of dynamical models 

      Bocquet, Marc; Brajard, Julien; Carrassi, Alberto; Bertino, Laurent (Peer reviewed; Journal article, 2019)
      Recent progress in machine learning has shown how to forecast and, to some extent, learn the dynamics of a model from its output, resorting in particular to neural networks and deep learning techniques. We will show how ...
    • Data assimilation using adaptive, non-conservative, moving mesh models 

      Aydogdu, Ali; Carrassi, Alberto; Guider, Colin T.; Jones, Chris K.R.T.; Rampal, Pierre (Peer reviewed; Journal article, 2019)
      Numerical models solved on adaptive moving meshes have become increasingly prevalent in recent years. Motivating problems include the study of fluids in a Lagrangian frame and the presence of highly localized structures ...
    • Data availability principles and practice 

      Smith, J. A.; Cessi, P.; Fer, Ilker; Foltz, G.; Fox-Kemper, Baylor; Heywood, Karen; Jones, N.; Klymak, Jody; Lacasce, Joseph Henry (Journal article, 2020)
    • A dataset of direct observations of sea ice drift and waves in ice 

      Rabault, Jean; Müller, Malte; Voermans, Joey; Brazhnikov, Dmitry; Turnbull, Ian; Marchenko, Aleksey; Biuw, Martin; Nose, Takehiko; Waseda, Takuji; Johansson, Malin; Breivik, Øyvind; Sutherland, Graig; Hole, Lars Robert; Johnson, Mark; Jensen, Atle; Gundersen, Olav; Kristoffersen, Yngve; Babanin, Alexander; Tedesco, Paulina Souza; Christensen, Kai Håkon; Kristiansen, Martin; Hope, Gaute; Kodaira, Tsubasa; Martins de Aguiar, Victor Cesar; Taelman, Catherine Cecilia A; Quigley, Cornelius Patrick; Filchuk, Kirill; Mahoney, Andrew R. (Journal article; Peer reviewed, 2023)
      Variability in sea ice conditions, combined with strong couplings to the atmosphere and the ocean, lead to a broad range of complex sea ice dynamics. More in-situ measurements are needed to better identify the phenomena ...
    • Dealing with uncertainty in ecosystem models along three axes; resolution, forcing and projections 

      Nilsen, Ina (Doctoral thesis, 2023-05-24)
      With the imminent threat of climate change, there is an urgent need to understand how warmer temperatures will affect marine ecosystems. Models provide the best tools to study the future, but although great efforts have ...
    • Decadal Changes in Ventilation and Anthropogenic Carbon in the Nordic Seas 

      Jeansson, Emil; Tanhua, Toste; Olsen, Are; Smethie Jr., William M.; Rajasakaren, Balamuralli; Olafsdóttir, Solveig R.; Ólafsson, Jón (Journal article; Peer reviewed, 2023)
      We evaluate the decadal evolution of ventilation and anthropogenic carbon (Cant) in the Nordic Seas between 1982 and the 2010s. Ventilation changes on decadal timescale are identified by evaluating decadal changes in mean ...
    • Decadal Predictability of the North Atlantic Eddy-Driven Jet in Winter 

      Marcheggiani, Andrea; Robson, Jon; Monerie, Paul-Arthur; Bracegirdle, Thomas J.; Smith, Doug (Journal article; Peer reviewed, 2023)
      This paper expands on work showing that the winter North Atlantic Oscillation (NAO) is predictable on decadal timescales to quantify the skill in capturing the North Atlantic eddy-driven jet's location and speed. By focusing ...
    • Decadal prediction of Sahel rainfall: where does the skill (or lack thereof) come from? 

      Mohino, Elsa; Keenlyside, Noel; Pohlmann, Holger (Peer reviewed; Journal article, 2016-12)
      Previous works suggest decadal predictions of Sahel rainfall could be skillful. However, the sources of such skill are still under debate. In addition, previous results are based on short validation periods (i.e. less than ...
    • Decadal solar irradiance variability in northern Europe 

      Parding, Kajsa (Doctoral thesis, 2014-11-28)
      Shortwave (SW) radiation from the Sun is the external energy source on Earth and the fundamental input of energy into the climate system. Variations of the SW radiation and its transfer through the atmosphere can have ...
    • Decadal trends in ocean acidification from the Ocean Weather Station M in the Norwegian Sea 

      Skjelvan, Ingunn; Lauvset, Siv Kari; Johannessen, Truls; Gundersen, Kjell; Skagseth, Øystein (Journal article; Peer reviewed, 2022)
      The Ocean Weather Station M (OWSM) is situated at a fixed position in the Norwegian Sea, one of the major basins of the Nordic Seas, which represents an important area for uptake of atmospheric CO2 as well as deep water ...
    • Decadal Trends in the Oceanic Storage of Anthropogenic Carbon From 1994 to 2014 

      Müller, Jens Daniel; Gruber, N.; Carter, B.; Feely, R.; Ishii, M.; Lange, N.; Lauvset, Siv Kari; Murata, A.; Olsen, Are; Pérez, F.F.; Sabine, C.; Tanhua, T.; Wanninkhof, R.; Zhu, D. (Journal article; Peer reviewed, 2023)
      The oceanic uptake and resulting storage of the anthropogenic CO2 (Cant) that humans have emitted into the atmosphere moderates climate change. Yet our knowledge about how this uptake and storage has progressed in time ...
    • Deconstructing Future AMOC Decline at 26.5°N 

      Asbjørnsen, Helene; Årthun, Marius (Journal article; Peer reviewed, 2023)
      The Atlantic Meridional Overturning Circulation (AMOC) is frequently used to diagnose the state of the North Atlantic circulation, but as an integrated quantity the AMOC strength does not necessarily mirror changes in the ...
    • Decreasing Arctic Sea Ice Mirrors Increasing CO2 on Decadal Time Scale 

      Johannessen, Ola M. (Atmospheric and Oceanic Science Letters, Journal article, 2008-11-16)
      Arctic sea ice is a keystone indicator of greenhouse-gas induced global climate change, which is expected to be amplified in the Arctic. Here we directly compare observed variations in arctic sea-ice extent and CO2 since ...
    • Decreasing intensity of open-ocean convection in the Greenland and Iceland seas 

      Moore, George William Kent; Våge, Kjetil; Pickart, Robert S.; Renfrew, Ian A. (Peer reviewed; Journal article, 2015)
      The air–sea transfer of heat and fresh water plays a critical role in the global climate system1. This is particularly true for the Greenland and Iceland seas, where these fluxes drive ocean convection that contributes to ...
    • Deep ocean experiments with fossil fuel carbon dioxide: creation and sensing of a controlled plume at 4 km depth 

      Brewer, Peter G.; Peltzer, Edward T.; Walz, Peter; Aya, Izuo; Yamane, Kenji; Kojima, Ryuji; Nakajima, Yasuharu; Nakayama, Noriko; Haugan, Peter Mosby; Johannessen, Truls (Peer reviewed; Journal article, 2005-01)
      The rapidly rising levels of atmospheric and oceanic CO2 from the burning of fossil fuels has lead to well-established international concerns over dangerous anthropogenic interference with climate. Disposal of captured ...
    • Deep weakly-stratified layers in the Greenland Sea 

      Horrach Pou, Joan Mateu (Master thesis, 2021-12-06)
      Deep weakly-stratified layers in the Greenland Sea constitute a mode of convection poorly understood. The Greenland Sea is where the densest portion of the overflow waters on either side of Iceland are formed through ...
    • The deepening of the Atlantic water in the Lofoten Basin of the Norwegian Sea, demonstrated by using an active reduced gravity model 

      Orvik, Kjell Arild (Peer reviewed; Journal article, 2004-06-29)
      The Norwegian Atlantic Current (NwAC) as a poleward eastern boundary current is to be considered as the northern limb of the Meridional Overturning Circulation in the North Atlantic (MOC). It transports warm and saline ...
    • Dense water formation and circulation in the Barents Sea 

      Årthun, Marius; Ingvaldsen, Randi; Smedsrud, Lars Henrik; Schrum, Corinna (Peer reviewed; Journal article, 2011)
      Dense water masses from Arctic shelf seas are an important part of the Arctic thermohaline system. We present previously unpublished observations from shallow banks in the Barents Sea, which reveal large interannual ...
    • Dense water formation in the Greenland Sea between 1999 and 2009 

      Svingen, Kristin (Master thesis, 2019-08-22)
      A 10-year continuous hydrographic data record from moored profilers located in the central Greenland Sea between 1999 and 2009 were used to examine the mixed-layer depth evolution through winter as well as interannual ...
    • The Departure from Mixed-Layer Similarity During the Afternoon Decay of Turbulence in the Free-Convective Boundary Layer: Results from Large-Eddy Simulations 

      Elguernaoui, Omar; Reuder, Joachim; Li, Dan; Maronga, Bjørn; Bakhoday Paskyabi, Mostafa; Wolf, Tobias; Esau, Igor (Journal article; Peer reviewed, 2023)
      This study analyses the departure of the velocity-variances profiles from their quasi-steady state described by the mixed-layer similarity, using large-eddy simulations with different prescribed shapes and time scales of ...