Now showing items 1-12 of 12

  • Assessing Model Uncertainties Through Proper Experimental Design 

    Hvidevold, Hilde Kristine; Alendal, Guttorm; Johannessen, Truls; Mannseth, Trond (Elsevier, 2013)
    This paper assesses how parameter uncertainties in the model for rise velocity of CO2 droplets in the ocean cause uncertainties in their rise and dissolution in marine waters. The parameter uncertainties in the rise velocity ...
  • Flow over a backward-facing step, a numerical study comparing a zand a σ-coordinate model 

    Rygg, Kristin; Alendal, Guttorm; Haugan, Peter Mosby (Springer Verlag, 2011)
    Homogeneous, nonrotating flow over a backward-facing rounded step is simulated using the 2D vertical version of two general circulation models, a z-coordinate model—the Massachusetts Institute of Technology general ...
  • Gas exploration beyond the shelf break : an oceanographic challenge 

    Thiem, Øyvind; Berntsen, Jarle; Eldevik, Tor; Alendal, Guttorm (Elsevier, 2006-02)
    Norway's second largest gas field, Ormen Lange, is located 140 km west off Kristiansund at an unprecedented depth when it comes to exploration. It will be the first Norwegian project beyond the shelf break. Exploration ...
  • Modelling of deep-sea gravity currents using an integrated plume model 

    Alendal, Guttorm; Drange, Helge; Haugan, Peter Mosby (American Geophysical Union, 1994)
  • A numerical study of transport and spreading of gases from natural analogues of gas-seepage through the seafloor 

    Enstad, Lars Inge; Alendal, Guttorm; Haugan, Peter Mosby (Elsevier, 2009-02)
    Natural leakages of CO2 are reported in the literature at mid ocean ridges and CH4 seepages in hydrocarbon rich ares. These could potentially serve as natural analogues of leakages from CO2 storages. In this study we have ...
  • Ocean abyssal carbon experiments at 0.7 and 4 km depth 

    Haugan, Peter Mosby; Brewer, Peter G.; Peltzer, Edward T.; Walz, Peter; Aya, Izuo; Yamane, Kenji; Kojima, Ryuji; Nakajima, Yasuharu; Nakayama, Noriko; Hove, Joakim; Johannessen, Truls; Bellerby, Richard G. J.; Alendal, Guttorm (Elsevier, 2005)
    Observations from small-scale (20 to 90 litres) CO2 experiments conducted off the coast of California at 684 m depth and at 3942 m depth are discussed. In both experiments, when the seawater velocity was sufficiently strong, ...
  • Ocean release of fossil fuel CO2: A case study 

    Drange, Helge; Alendal, Guttorm; Johannessen, Ola M. (American Geophysical Union, 2001-07-01)
    The natural ocean uptake of the greenhouse gas CO2 can be accelerated by collecting and liquefying the gas from point sources, and by pumping it into the ocean at appropriate locations and at sufficient depths. Results ...
  • Parameterization of drag and dissolution of rising CO2 drops in seawater 

    Gangstø, Reidun; Haugan, Peter Mosby; Alendal, Guttorm (American Geophysical Union, 2005-05-24)
    In this work the dynamics and dissolution of a hydratecovered CO2 drop were studied, using a numeric model and data from one of very few CO2 experiments performed in the real ocean. A theory including the standard drag ...
  • PVTx Properties of a Two-phase CO2 Jet from Ruptured Pipeline 

    Botnen, Helle Augdal; Omar, Abdirahman; Aavatsmark, Ivar; Alendal, Guttorm; Johannessen, Truls (Elsevier, 2013)
    Span and Wagner equation of state (SW EOS) have been used to investigate changes in the thermodynamic properties of CO2 during a depressurization process from a pipeline into marine environment. The process is assumed to ...
  • Topographic effects on CO2, diffusion and dissolution from the seafloor 

    Rygg, Kristin; Enstad, Lars Inge; Alendal, Guttorm; Haugan, Peter Mosby (Elsevier, 2009-02)
    At 3000 meters depth liquid CO2 is denser than seawater and hence will be stored as a “lake” on the deep ocean floor, which is expected to gradually be dissolved in seawater. Ocean currents and turbulence will influence ...
  • Turbulent diffusion and transport from a CO2 lake in the deep ocean 

    Haugan, Peter Mosby; Alendal, Guttorm (American Geophysical Union, 2005-09-21)
    If liquid CO2 is stored as a dense ‘‘lake’’ on the deep ocean floor, it is expected to dissolve in seawater. Ocean currents and turbulence can increase the net rate of CO2 release by several orders of magnitude compared ...
  • Two-phase, near-field modeling of purposefully released CO2 in the ocean 

    Alendal, Guttorm; Drange, Helge (American Geophysical Union, 2001-01-15)