Blar i Geophysical Institute på tittel

Viser treff 1079-1098 av 1187

    • Transport Upscaling in Porous Media 

      Nedreli, Anette Cathrine (Master thesis, 2014-06-02)
      Numerical models are important for modeling what happens in porous media. In this thesis we will simulate the heat transport in geothermal reservoirs. Because these reservoirs are usually quite large, we will make a model ...

    • Trapped tidal currents generate freely propagating internal waves at the Arctic continental slope 

      Baumann, Till Martin; Fer, Ilker (Journal article; Peer reviewed, 2023)
      Energetic tidal currents in the Arctic play an important role in local mixing processes, but they are primarily confined to the shelves and continental slopes due to topographic trapping north of their critical latitude. ...

    • Trends and drivers in global surface ocean pH over the past 3 decades 

      Lauvset, Siv Kari; Gruber, Nicolas; Landschützer, Peter; Olsen, Are; Tjiputra, Jerry (Peer reviewed; Journal article, 2015-03-02)
      We report global long-term trends in surface ocean pH using a new pH data set computed by combining fCO2 observations from the Surface Ocean CO2 Atlas (SOCAT) version 2 with surface alkalinity estimates based on temperature ...

    • Trends in extreme precipitation and the influence by meteorological parameters following the RCP8.5 scenario over 2 catchments in India 

      Soldal, Ingri Halland (Master thesis, 2015-06-02)
      The Historical1 simulation (1960-2000) and the RCP8.5 scenario (2060-2100) from the NorESM are used to investigate trends in extreme precipitation, as well as the impact from vertical velocity, specific humidity, divergence ...

    • Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003-2015 

      Omar, Abdirahman; Thomas, Helmuth; Olsen, Are; Becker, Meike; Skjelvan, Ingunn; Reverdin, Gilles (Peer reviewed; Journal article, 2019-10-29)
      For continental shelf regions, the long‐term trend in sea surface carbon dioxide (CO2) partial pressure (pCO2) and rates of ocean acidification are not accurately known. Here, we investigate the decadal trend of observed ...

    • Trivial gain of downscaling in future projections of higher trophic levels in the Nordic and Barents Seas 

      Nilsen, Ina; Fransner, Sara Filippa Krusmynta; Olsen, Are; Tjiputra, Jerry; Hordoir, Robinson; Hansen, Cecilie (Journal article; Peer reviewed, 2023)
      Downscaling physical forcing from global climate models is both time consuming and labor demanding and can delay or limit the physical forcing available for regional marine ecosystem modelers. Earlier studies have shown ...

    • The tropical Atlantic observing system 

      Foltź, Gregory R.; Brandt, Peter; Richter, Ingo; Rodriguez-fonseca, Belen; Hernandez, Fabrice; Dengler, Marcus; Rodrigues, Regina R.; Schmidt, Jörn O.; Yu, Lisan; Lefevre, Nathalie; Da Cunha, Leticia Cotrim; McPhaden, Michael J.; Araujo Filho, Moacyr C.; Karstensen, Johannes; Hahn, Johannes; Martín-Rey, Marta; Patricola, Christina M.; Poli, Paul; Zuidema, Paquita; Hummels, Rebecca; Perez, Renellys C.; Hatje, Vanessa; Lübbecke, Joke; Polo, Irene; Lumpkin, Rick; Bourles, Bernard; Asuquo, Francis E.; Lehodey, Patrick; Conchon, Anna; Chang, Ping; Dandin, Philippe; Schmid, Claudia; Sutton, Adrienne J.; Giordani, Herve; Xue, Yan; Illig, Serena; Losada, Teresa; Grodsky, Semyon; Gasparin, Florent; Lee, Tong; Mohino, Elsa; Nobre, Paulo; Wanninkhof, Rik; Keenlyside, Noel; Garcon, Veronique; Sánchez-Gómez, Emilia; Nnamchi, Hyacinth C.; Drévillon, Marie; Storto, Andrea; Remy, Elisabeth; Lazar, Alban; Speich, Sabrina; Goes, Marlos P.; Dorrington, Tarquin; Johns, William E.; Moum, James N.; Robinson, Carol; Perruche, Coralie; Souza, Ronald B.; Gaye, Amadou; López-Parages, Jorge; Monerie, Paul-Arthur; Castellanos, Paola; Benson, Nsikak U.; Hounkonnou, Mahouton N.; Duhá, Janice T.; Laxenaire, Rémi; Reul, Nicolas (Peer reviewed; Journal article, 2019-05-10)
      The tropical Atlantic is home to multiple coupled climate variations covering a wide range of timescales and impacting societally relevant phenomena such as continental rainfall, Atlantic hurricane activity, oceanic ...

    • Tropical Atlantic variability: Observations and modeling 

      Cabos, William; de la Vara, Alba; Koseki, Shunya (Peer reviewed; Journal article, 2019-08-27)
      We review the state-of-the-art knowledge of Tropical Atlantic Variability (TAV). A well-developed observing system and sustained effort of the climate modeling community have improved our understanding of TAV. It is dominated ...

    • Tropical Atmospheric Response of Atlantic Niños to Changes in the Ocean Background State 

      Svendsen, Lea; Rodríguez-Fonseca, Belén; Mohino, Elsa; Crespo, Lander Rodriguez; Losada, Teresa (Journal article; Peer reviewed, 2023)
      Since the 1970s, Atlantic Niños during boreal summer have been linked to Pacific La Niñas the following winter. Earlier studies have explained the appearance of the Atlantic-Pacific teleconnection with changing Atlantic ...

    • Tuning the Diet of North-East Arctic Cod in the Barents Sea - An Exploration with the end-to-end Model ATLANTIS 

      Jähkel, Anne (Master thesis, 2013-06-03)
      This thesis explores the feeding relationships of Atlantic cod (Gadus morhua) on its major prey species within the Barents Sea using the newly developed Atlantis model for the region. Atlantis is an end-to-end model designed ...

    • Turbulence and heat exchange under ice 

      Sirevaag, Anders (Master thesis, 2003)
      Turbulent fluxes of heat and salt were measured under sea ice at four different locations around Spitsbergen. In Kongsfjorden on West Spitsbergen additional measurements of heat fluxes in the ice and in the atmosphere were ...

    • Turbulence in a coastal environment: the case of Vindeby 

      Putri, Rieska Mawarni; Cheynet, Etienne; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic (Journal article; Peer reviewed, 2022)
      The one-point and two-point power spectral densities of the wind velocity fluctuations are studied using the observations from an offshore mast at Vindeby Offshore Wind Farm, for a wide range of thermal stratifications of ...

    • Turbulence Measurements in Shallow Water from a Subsurface Moored Moving Platform 

      Paskyabi, Mostafa Bakhoday; Fer, Ilker (Peer reviewed; Journal article, 2013)
      Preliminary results are presented from a moored, autonomous instrument measuring the upper ocean turbulent dissipation rate together with the surface gravity wave field. Observations are made in the area approximately 30 ...

    • Turbulence structure in the upper ocean: a comparative study of observations and modeling 

      Paskyabi, Mostafa Bakhoday; Fer, Ilker (Peer reviewed; Journal article, 2014-04)
      Observations of turbulent dissipation rates measured by two independent instruments are compared with numerical model runs to investigate the injection of turbulence generated by sea surface gravity waves. The nearsurface ...

    • Turbulence-particle interactions under surface gravity waves 

      Bakhoday Paskyabi, Mostafa (Peer reviewed; Journal article, 2016)
      The dispersion and transport of single inertial particles through an oscillatory turbulent aquatic environment are examined numerically by a Lagrangian particle tracking model using a series of idealised test cases. The ...

    • Turbulent diffusion and transport from a CO2 lake in the deep ocean 

      Haugan, Peter Mosby; Alendal, Guttorm (Journal article, 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 ...

    • Turbulent heat and momentum fluxes in the upper ocean under Arctic sea ice 

      Peterson, Algot Kristoffer; Fer, Ilker; McPhee, Miles G.; Randelhoff, Achim (Peer reviewed; Journal article, 2017-02)
      We report observations of heat and momentum fluxes measured in the ice-ocean boundary layer from four drift stations between January and June 2015, covering from the typical Arctic basin conditions in the Nansen Basin to ...

    • Turbulent kinetic energy estimates from profiling wind LiDAR measurements and their potential for wind energy applications 

      Kumer, Valerie-Marie; Reuder, Joachim; Dorninger, Manfred; Zauner, Rudolf; Grubišić, Vanda (Peer reviewed; Journal article, 2016-07-10)
      This study shows that turbulent kinetic energy (TKE) estimates, derived from static LiDARs in Doppler Beam Swing (DBS) mode, permit a qualitative and quantitative characterization and analysis of turbulent structures as ...

    • Turbulent upper-ocean mixing affected by meltwater layers during Arctic summer 

      Randelhoff, Achim; Fer, Ilker; Sundfjord, Arild (Peer reviewed; Journal article, 2017-04)
      Every summer, intense sea ice melt around the margins of the Arctic pack ice leads to a stratified surface layer, potentially without a traditional surface mixed layer. The associated strengthening of near-surface ...

    • Twenty-One Years of Phytoplankton Bloom Phenology in the Barents, Norwegian, and North Seas 

      Silva, Edson; Counillon, François; Brajard, Julien; Korosov, Anton; Pettersson, Lasse H; Samuelsen, Annette; Keenlyside, Noel (Journal article; Peer reviewed, 2021)
      Phytoplankton blooms provide biomass to the marine trophic web, contribute to the carbon removal from the atmosphere and can be deadly when associated with harmful species. This points to the need to understand the phenology ...