Recent Submissions

  • Impact of springtime Himalayan-Tibetan Plateau snowpack on the onset of the Indian summer monsoon in coupled seasonal forecasts 

    Senan, Retish; Orsolini, Yvan; Weisheimer, Antje; Vitart, Frédéric; Balsamo, Gianpaolo; Dutra, E.; Doblas-Reyes, Franscisco J.; Basang, Droma (Springer, 2016-02-20)
    The springtime snowpack over the Himalayan–Tibetan Plateau (HTP) region and Eurasia has long been suggested to be an influential factor on the onset of the Indian summer monsoon. To assess the impact of realistic initialization ...
    Journal article
  • A diagram of wind speed versus air-sea temperature difference to understand the marine atmospheric boundary layer 

    Kettle, Anthony (Elsevier, 2015-08-28)
    This contribution reviews the dynamics in the marine atmospheric boundary layer (MABL) with a diagnostic diagram: wind speed versus air-sea temperature difference or U-ΔT. The diagram was first used by Alfred Woodcock in ...
    Journal article
  • A statistical gap-filling method to interpolate global monthly surface ocean carbon dioxide data 

    Jones, Steve D.; Le Quéré, Corinne; Rödenbeck, Christian; Manning, Andrew C.; Olsen, Are (AGU Publications, 2015-10-24)
    We have developed a statistical gap-filling method adapted to the specific coverage and properties of observed fugacity of surface ocean CO2 (fCO2). We have used this method to interpolate the Surface Ocean CO2 Atlas (SOCAT) ...
    Journal article
  • Calving rates at tidewater glaciers vary strongly with ocean temperature 

    Luckman, Adrian; Benn, Doug; Cottier, Finlo; Bevan, Suzanne; Nilsen, Frank; Inall, Mark (Nature Publishing Group, 2015-10-09)
    Rates of ice mass loss at the calving margins of tidewater glaciers (frontal ablation rates) are a key uncertainty in sea level rise projections. Measurements are difficult because mass lost is replaced by ice flow at ...
    Journal article
  • Simulations of the Bergen orographic wind shelter 

    Jonassen, Marius Opsanger; Ólafsson, Haraldur; Valved, Aslaug Skålevik; Reuder, Joachim; Olseth, Jan Asle (Co-action publishing, 2013-10-10)
    Even though the coast of western Norway is very windy, the centre of Bergen is rather calm. To gain further understanding of this wind shelter, we study the flow in the complex topography of Bergen during two south-westerly ...
    Journal article
  • Assessment of wind conditions at a fjord inlet by complementary use of sonic anemometers and lidars 

    Jakobsen, Jasna Bogunovic; Cheynet, Etienne; Snæbjörnsson, Jonas Thor; Mikkelsen, Torben; Sjøholm, Mikael; Angelou, Nicolas; Hansen, Per; Mann, Jakob; Svardal, Benny; Kumer, Valerie-Marie; Reuder, Joachim (Elsevier Ltd., 2015-12-02)
    Wind velocity measurement devices based on the remote optical sensing, lidars, are extensively applied in wind energy research and wind farm operation. The present paper demonstrates the relevance and potential of lidar ...
    Journal article
  • Solar forcing synchronizes decadal North Atlantic climate variability 

    Thiéblemont, Rémi; Matthes, Katja; Omrani, Nour-Eddine; Kodera, Kunihiko; Hansen, Felicitas (Nature Publishing Group, 2015-09-15)
    Quasi-decadal variability in solar irradiance has been suggested to exert a substantial effect on Earth’s regional climate. In the North Atlantic sector, the 11-year solar signal has been proposed to project onto a pattern ...
    Journal article
  • A toolbox for secondary quality control on ocean chemistry and hydrographic data 

    Lauvset, Siv Kari; Tanhua, Toste (Wiley, 2015-11)
    High quality, reference measurements of chemical and physical properties of seawater are of great importance for a wide research community, including the need to validate models and attempts to quantify spatial and temporal ...
    Journal article
  • Thermodynamic controls of the Atlantic Niño 

    Nnamchi, Hyacinth C; Li, Jianping; Kucharski, Fred; Kang, In-Sik; Keenlyside, Noel; Chang, Ping; Farneti, Riccardo (Nature Publishing Group (NPG), 2015-11-26)
    Prevailing theories on the equatorial Atlantic Niño are based on the dynamical interaction between atmosphere and ocean. However, dynamical coupled ocean-atmosphere models poorly simulate and predict equatorial Atlantic ...
    Journal article
  • Frontal-wave cyclogenesis in the North Atlantic –a climatological characterisation 

    Schemm, Sebastian; Sprenger, Michael (Wiley, 2015-10)
    The ambient conditions during cyclogenesis on fronts in the North Atlantic (NA) are characterised climatologically in the ERA-Interim dataset. These ‘secondary’ cyclones, which grow from frontal waves, are typically small ...
    Journal article
  • Response of Arctic Ocean stratification to changing river runoff in a column model 

    Nummelin, Aleksi; Li, Camille; Smedsrud, Lars H. (Wiley, 2015-04-07)
    A one-dimensional model of the atmosphere-ice-ocean column is used to study the effects of changing river runoff to the Arctic Ocean. River runoff is the largest contributor of freshwater to the Arctic and is expected to ...
    Journal article
  • Global and regional surface cooling in a warming climate: a multi-model analysis 

    Medhaug, Iselin; Drange, Helge (Springer, 2015)
    Instrumental temperature records show that the global climate may experience decadal-scale periods without warming despite a long-term warming trend. We analysed 17 global climate models participating in phase 5 of the ...
    Journal article
  • The Madden-Julian Oscillation in a warmer world 

    Chang, Chiung-Wen June; Tseng, Wan-Ling; Huang-Hsiung, Hsu; Keenlyside, Noel; Tsuang, Ben-Jei (Wiley, 2015-07)
    Global warming's impact on the Madden-Julian Oscillation (MJO) is assessed using one of the few models capable in reproducing its key features. In a warmer climate predicted for the end of the century, the MJO increases ...
    Journal article
  • Characterisation of Single Wind Turbine Wakes with Static and Scanning WINTWEX-W LiDAR Data 

    Kumer, Valerie-Marie; Reuder, Joachim; Svardal, Benny; Sætre, Camilla; Eecen, Peter (Elsevier, 2015)
    With further development of LiDAR technology wake measurements by use of LiDAR became of common interest in the wind energy community. To study new measurement strategies of scanning and nacelle LiDARs, in combination with ...
    Journal article
  • An assessment of future extreme precipitation in western Norway using a linear model 

    Caroletti, Giulio Nils; Barstad, Ida (The University of Bergen, 2010-11-26)
    A Linear Model (Smith and Barstad, 2004) was used to dynamically downscale Orographic Precipitation over western Norway from twelve General Circulation Model simulations. The GCM simulations come from the A1B emissions ...
    Journal article
  • Regional climate models' performance in representing precipitation and temperature over selected Mediterranean areas 

    Deidda, Roberto; Marrocu, Marino; Caroletti, Giulio Nils; Pusceddu, Gabriella; Langousis, Andreas; Lucarini, Valerio; Puliga, Michele; Speranza, Antonio (Copernicus Publications, 2013-12-12)
    This paper discusses the relative performance of several climate models in providing reliable forcing for hydrological modeling in six representative catchments in the Mediterranean region. We consider 14 Regional Climate ...
    Journal article
  • A Linear Model for Orographic Precipitation in meteorological and climatological downscaling 

    Caroletti, Giulio Nils (The University of Bergen, 2015-06-24)
    Orographic precipitation has always been a major field of study in atmospheric sciences, because of its major role in the water budget and its influence on environmental hazards like floods and droughts - and thus on human ...
    Doctoral thesis
  • Offshore Wind Farm Wake Effect on Stratification and Coastal Upwelling 

    Bakhoday Paskyabi, Mostafa (Elsevier Ltd., 2015-12-02)
    In this study, the interactions between an offshore wind farm, upper-ocean currents, and stratification are examined under shallow water conditions from a two-dimensional modeling standpoint. The modeling results from two ...
    Journal article
  • The impact of mean state errors on equatorial Atlantic interannual variability in a climate model 

    Ding, Hui; Keenlyside, Noel; Latif, Mojib; Park, Wonsun; Wahl, Sebastian (American Geophysical Union, 2015-02-23)
    Observations show that the Equatorial Atlantic Zonal Mode (ZM) obeys similar physics to the El Niño Southern Oscillation (ENSO): positive Bjerknes and delayed negative feedbacks. This implies the ZM may be predictable on ...
    Journal article
  • Resolving the upper-ocean warm layer improves the simulation of the Madden-Julian oscillation 

    Tseng, Wan-Ling; Tsuang, Ben-Jei; Keenlyside, Noel; Hsu, Huang-Hsiung; Tu, Chia-Ying (Springer, 2014-09)
    Here we show that coupling a high-resolution one-column ocean model to an atmospheric general circulation model dramatically improves simulation of the Madden–Julian oscillation (MJO) to have realistic strength, period, ...
    Journal article

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