Now showing items 1-20 of 41

  • Anthropogenic increase of oceanic pCO2 in the Barents Sea surface water 

    Omar, Abdirahman M.; Johannessen, Truls; Kaltin, Staffan; Olsen, Are (American Geophysical Union, 2003-12-26)
    We evaluate the change of surface water CO2 partial pressure ( pCO2 sw) in the Barents Sea (BS) between 1967 and 2000–2001. We use temperature (T) data collected during a survey in the BS in 1967 and a relationship between ...
  • Atmospheric boundary layers in storms: advanced theory and modelling applications 

    Zilitinkevich, Sergej S.; Esau, Igor N.; Baklanov, A. (European Geosciences Union/Copernicus, 2005-03-29)
    Turbulent planetary boundary layers (PBLs) control the exchange processes between the atmosphere and the ocean/land. The key problems of PBL physics are to determine the PBL height, the momentum, energy and matter fluxes ...
  • Baroclinic Instability in the West Spitsbergen Current 

    Teigen, Sigurd Henrik; Nilsen, Frank; Skogseth, Ragnheid; Gjevik, Bjørn; Beszczynska-Möller, Agnieszka (2011-07-15)
    Baroclinic instability in the West Spitsbergen Current is investigated, based on data from an array of current meter moorings along 78.83oN, across the deeper (1000-2400 m) section of the continental slope west of Svalbard. ...
  • Barotropic instability in the West Spitsbergen Current 

    Teigen, Sigurd Henrik; Nilsen, Frank; Gjevik, Bjørn (American Geophysical Union, 2010-07-24)
    Barotropic instability in the shoreward branch of the West Spitsbergen Current is investigated on the basis of data from an array of current meter moorings along 78.83°N, across the upper continental slope and shelf break ...
  • Critical vulnerabilities of marine and sea ice–based ecosystems in the high Arctic 

    Johannessen, Ola M.; Miles, Martin W. (Springer, 2010-12-01)
    The objectives of this paper are to summarise: (1) observed 20th-century and projected 21st-century changes in key components of the Arctic climate system and (2) probable impacts on the Arctic marine environment, with ...
  • 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 (Sears Foundation for Marine Research, 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 (American Geophysical Union, 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 (Elsevier, 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 ...
  • 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 (Springer, 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 ...
  • A diagnosis of warm-core and cold-core extratropical cyclone development using the Zwack–Okossi equation 

    Azad, Roohollah; Sorteberg, Asgeir (Royal Meteorological Society and Wiley-Blackwell, 2009)
    In this study, the development of a warm-core and cold-core extratropical cyclone over North Atlantic is examined. The geostrophic relative vorticity tendency used to diagnose the development is calculated utilizing the ...
  • Downslope windstorm in Iceland –WRF/MM5 model comparison 

    Rögnvaldsson, Ólafur; Bao, J. W.; Ágústsson, Hálfdán; Ólafsson, Haraldur (European Geosciences Union, 2011-01-05)
    A severe windstorm downstream of Mt. Öræfajökull in Southeast Iceland is simulated on a grid of 1 km horizontal resolution by using the PSU/NCAR MM5 model and the Advanced Research WRF model. Both models are run with ...
  • Drag coefficient reduction at very high wind speeds 

    Bye, John A. T.; Jenkins, Alastair D. (American Geophysical Union, 2006-03-31)
    The correct representation of the 10-m drag coefficient for momentum (K10) at extreme wind speeds is very important for modeling the development of tropical depressions and may also be relevant to the understanding of ...
  • Dynamical downscaling of ERA-40 in complex terrain using the WRF regional climate model 

    Heikkilä, Ulla Elina; Sandvik, Anne Dagrun; Sorteberg, Asgeir (Springer, 2010)
    Results from a first-time employment of the WRF regional climate model to climatological simulations in Europe are presented. The ERA-40 reanalysis (resolution 1 ) has been downscaled to a horizontal resolution of 30 ...
  • Extracting statistical parameters of extreme precipitation from a NWP model 

    Eliasson, J.; Rögnvaldsson, Ólafur; Jónsson, T. (European Geosciences Union, 2009-11-25)
    Precipitation simulations on an 8×8 km grid using the PSU/NCAR Mesoscale Model MM5 are used to estimate the M5 and Ci statistical parameters in order to support the M5 map used for flood estimates by Icelandic engineers. ...
  • FLOHOF 2007: an overview of the mesoscale meteorological field campaign at Hofsjökull, Central Iceland 

    Reuder, Joachim; Ablinger, Markus; Ágústsson, Hálfdán; Brisset, Pascal; Brynjólfsson, Sveinn; Garhammer, Markus; Jóhannesson, Tómas; Jonassen, Marius O.; Kühnel, Rafael; Lämmlein, Stephan; de Lange, Tor; Lindenberg, Christian; Malardel, Sylvie; Mayer, Stephanie; Müller, Martin; Ólafsson, Haraldur; Rögnvaldsson, Ólafur; Schäper, Wolfgang; Spengler, Thomas; Zängl, Günther; Egger, Joseph (Springer Vienna, 2012-04)
    The FLOHOF field campaign took place in the period July 21 to August 24, 2007 on and in the surroundings of Hofsjökull glacier in Central Iceland. During the campaign, 18 automatic weather stations (AWS) recording temperature, ...
  • Global observed changes in daily climate extremes of temperature and precipitation 

    Alexander, L. V.; Zhang, X.; Peterson, T. C.; Caesar, J.; Gleason, B.; Klein Tank, A.; Haylock, M.; Collins, D.; Trewin, B.; Rahimzadeh, F.; Tagipour, A.; Ambenje, P.; Kumar, K. Rupa; Revadekar, J.; Griffiths, G.; Vincent, L.; Stephenson, David B.; Burn, J.; Aguliar, E.; Brunet, M.; Taylor, M.; New, M.; Zhai, P.; Rusticucci, M.; Vazquez-Aguirre, J. L. (American Geophysical Union, 2006-03-15)
    A suite of climate change indices derived from daily temperature and precipitation data, with a primary focus on extreme events, were computed and analyzed. By setting an exact formula for each index and using specially ...
  • The impact of the wind stress curl in the North Atlantic on the Atlantic inflow to the Norwegian Sea toward the Arctic 

    Orvik, Kjell Arild; Skagseth, Øystein (American Geophysical Union, 2003-09-04)
    The Norwegian Atlantic Current (NwAC) through the Norwegian Sea serves as a conduit of warm and saline Atlantic water from the North Atlantic to the Arctic Ocean, an important factor for climate and ecology. In this ...
  • Impacts of climate change on Blue Nile flows using bias-corrected GCM scenarios 

    Elshamy, Mohamed; Seierstad, Ivar Ambjørn; Sorteberg, Asgeir (Copernicus Publications on behalf of the European Geosciences Union, 2009)
    This study analyses the output of 17 general circulation models (GCMs) included in the 4th IPCC assessment report. Downscaled precipitation and potential (reference crop) evapotranspiration (PET) scenarios for the ...
  • Implementation of slope irradiance in Mesoscale Model version 5 and its effect on temperature and wind fields during the breakup of a temperature inversion 

    Hauge, Gard; Hole, L. R. (American Geophysical Union, 2003-01-24)
    The atmospheric mesoscale model MM5 has been used at high horizontal resolution to simulate the breakup of a temperature inversion in complex topography. To improve the surface parameterizations during daytime, slope and ...
  • Interannual variability in the wintertime air–sea flux of carbon dioxide in the northern North Atlantic, 1981–2001 

    Olsen, Are; Bellerby, Richard G. J.; Johannessen, Truls; Omar, Abdirahman M.; Skjelvan, Ingunn (Elsevier, 2003)
    Gridded fields of sea surface temperature (SST), sea level pressure (SLP), and wind speed were used in combination with data for the atmospheric mole fraction of CO2 and an empirical relationship between measured values ...