• 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Description and evaluation of the Bergen climate model: ARPEGE coupled with MICOM 

      Furevik, Tore; Bentsen, Mats; Drange, Helge; Kindem, I. K. T.; Kvamstø, Nils Gunnar; Sorteberg, Asgeir (Peer reviewed; Journal article, 2003-07)
      A new coupled atmosphere–ocean–sea ice model has been developed, named the Bergen Climate Model (BCM). It consists of the atmospheric model ARPEGE/IFS, together with a global version of the ocean model MICOM including a ...
    • Design of rectifier system for electric ferries 

      Sagedal, Andreas (Master thesis, 2018-06-16)
      This study investigates the requirements and technologies to provide power from shore to ship when the electric ferry is at quay. Different rectifier systems will be evaluated in terms of requirements given by the utility ...
    • Detection and Timing of Gamma-Ray Pulsations from the 707 Hz Pulsar J0952−0607 

      Nieder, Lars; Clark, Colin J.; Bassa, Cees G.; Wu, Jason; Singh, Avneet; Donner, Julian Y.; Allen, Bruce; Breton, René P.; Dhillon, Vikrram S.; Eggenstein, Heinz Bernd; Hessels, Jason W.T.; Kennedy, Mark R.; Kerr, Matthew; Littlefair, Stuart P.; Marsh, Thomas R.; Sánchez, D. Mata; Papa, Maria Alessandra; Ray, Paul S.; Steltner, Benjamin; Verbiest, Joris P.W. (Journal article; Peer reviewed, 2019)
      The Low-Frequency Array radio telescope discovered the 707 Hz binary millisecond pulsar (MSP) J0952−0607 in a targeted radio pulsation search of an unidentified Fermi gamma-ray source. This source shows a weak energy flux ...
    • Development and Comparison of Compressor Models for Heat Pump Applications in TRNSYS 

      Vindenes, Elisabeth (Master thesis, 2018-06-22)
      Heat pump systems may serve as a replacement for many heating systems using fossil fuels for heating purposes. Heat pumps are widely used in Norway where electric energy is abundant and inexpensive. Research and development ...
    • The development and evaluation of an idealized ocean model for the Bergen Dynamic Model 

      Thorsteinsson, Trond (Master thesis, 2013-11-20)
      Three idealized ocean model versions are developed for the Bergen Dynamic Model (Bedymo). All three model versions fall into the category of slab ocean models. One version is more or less a standard slab ocean model, while ...
    • Development of a new urban climate model based on the model PALM – Project overview, planned work, and first achievements 

      Maronga, Bjørn; Gross, Günter; Raasch, Siegfried; Banzhaf, Sabine; Forkel, Renate; Heldens, Wieke; Kanani-Sühring, Farah; Matzarakis, Andreas; Mauder, Matthias; Pavlik, Dirk; Pfafferott, Jens; Schubert, Sebastian; Seckmeyer, Gunther; Sieker, Heiko; Winderlich, Kristina (Journal article; Peer reviewed, 2019)
      In this article we outline the model development planned within the joint project Model-based city planning and application in climate change (MOSAIK). The MOSAIK project is funded by the German Federal Ministry of Education ...
    • Development of community, capabilities and understanding through unmanned aircraft-based atmospheric research: The LAPSE-RATE campaign 

      De Boer, Gijs; Diehl, Constantin; Jacob, Jamey; Houston, Adam; Smith, Suzanne; Chilson, Phillip B.; Schmale, David; Intrieri, Janet; Pinto, James; Elston, Jack; Brus, David; Kemppinen, Osku; Clark, Alex; Lawrence, Dale; Bailey, Sean; Sama, Michael; Frazier, Amy; Crick, Christopher; Natalie, Victoria; Pillar-Little, Elizabeth; Klein, Petra; Waugh, Sean; Lundquist, Julie K.; Barbieri, Lindsay; Kral, Stephan; Jensen, Anders; Dixon, Cory; Borenstein, Steven; Hesselius, Daniel; Human, Kathleen; Hall, Philip; Argrow, Brian; Thronberry, Troy; Wright, Randy; Kelly, Jason (Peer reviewed; Journal article, 2020)
      Because unmanned aircraft systems (UAS) offer new perspectives on the atmosphere, their use in atmospheric science is expanding rapidly. In support of this growth, the International Society for Atmospheric Research Using ...
    • Diabatic Heating as a Pathway for Cyclone Clustering Encompassing the Extreme Storm Dagmar 

      Weijenborg, Christian; Spengler, Thomas (Journal article, 2020)
      Contrary to the general notion that extratropical cyclones reduce baroclinicity, the baroclinicity is found to be enhanced in the wake of the extreme winter storm Dagmar. Thus, individual storms can increase baroclinicity, ...
    • Diagnosing and Understanding the AMOC Biases in NorESM 

      Ivanova, Detelina; Bentsen, Mats; Ilicak, Mehmet; Gao, Chuncheng; Drange, Helge (Conference object; Peer reviewed, 2014)
      We investigate the Atlantic Meridional Overturning Circulation (AMOC) in the Norwegian Earth System Model (NorESM) featuring isopycnal ocean component (MICOM). The Coupled Model Intercomparison Phase 5 (CMIP5) NorESM ...
    • Diagnosing ocean tracer transport from Sellafield and Dounreay by equivalent diffusion and age 

      Orre, Steinar; Gao, Yongqi; Drange, Helge; Deleersnijder, Eric (Peer reviewed; Journal article, 2008-09-27)
      A simple approach for estimating the equivalent diffusion for diagnosing tracer transport is proposed. Two different expressions are derived; one is based directly on an analytical solution of the two-dimensional ...