Blar i Geophysical Institute på tittel

Viser treff 399-418 av 1290

    • Fine scale distribution of precipitation in the Voss area 

      Pontoppidan, Marie Louise Nielsen (Master thesis, 2015-06-05)
      The precipitation in Western Norway is strongly affected by its position in the mid latitude conveyor belt of synoptic systems. When the warm and moist air impinges on the complex mountainous terrain, large variabilities ...

    • Fingerprint of Climate Change on Southern Ocean Carbon Storage 

      Wright, R.M.; Le Quéré, Quere; Mayot, N.; Olsen, Are; Bakker, D.C.E. (Journal article; Peer reviewed, 2023)
      The Southern Ocean plays a critical role in the uptake, transport, and storage of carbon by the global oceans. It is the ocean's largest sink of CO2, yet it is also among the regions with the lowest storage of anthropogenic ...

    • Finite Element Analysis of the fatigue strength of a big-end bolt 

      Langeland, Jan Harald (Master thesis, 2017-06-23)
      This thesis investigates, with the use of finite element method, the stress formation in a big-end bolt during the power stroke in an IC piston engine. The method used is quasi-static analysis of the lower part of the ...

    • A finite element method for simulating soft active non-shearable rods immersed in generalized Newtonian fluids 

      Ausas, Roberto Federico; Gebhardt, Cristian Guillermo; Buscaglia, Gustavo Carlos (Journal article; Peer reviewed, 2022)
      We propose a finite element method for simulating one-dimensional solid models with finite thickness and finite length that move and experience large deformations while immersed in generalized Newtonian fluids. The method ...

    • First results of turbulence measurements in a wind park with the Small Unmanned Meteorological Observer SUMO 

      Reuder, Joachim; Jonassen, Marius Opsanger (Peer reviewed; Journal article, 2012-01)
      The Small Unmanned Meteorological Observer (SUMO), equipped with a miniaturized 5-hole probe for turbulent flow measurements with 100 Hz temporal resolution, has for the first time been operated in and around a wind farm. ...

    • A flexible device to produce a gas stream with a precisely controlled water vapour mixing ratio and isotope composition based on microdrop dispensing technology 

      Sodemann, Harald; Dekhtyareva, Alena; Bremer, Alvaro Fernandez; Seidl, Andrew Walter; Maccali, Jenny (Journal article; Peer reviewed, 2023)
      ​​​​​​​Here we describe a versatile device to produce a gas stream with a precisely controlled water vapour mixing ratio and stable water isotope composition based on microdrop dispensing technology. To produce a moist ...

    • FLIIMP - a community software for the processing, calibration, and reporting of liquid water isotope measurements on cavity-ring down spectrometers 

      Sodemann, Harald; Mørkved, Pål Tore; Wahl, Sonja (Journal article; Peer reviewed, 2023)
      Precise and accurate measurements of the stable isotope composition from precipitation, land ice, runoff, and oceans provide critical information on Earth's water cycle. The analysis, post-processing, and calibration of ...

    • 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 (Peer reviewed; Journal article, 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, ...

    • Flow over a backward-facing step, a numerical study comparing a zand a σ-coordinate model 

      Rygg, Kristin; Alendal, Guttorm; Haugan, Peter Mosby (Peer reviewed; Journal article, 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 circulation ...

    • Flow Structure around a Multicopter Drone: A Computational Fluid Dynamics Analysis for Sensor Placement Considerations 

      Ghirardelli, Mauro; Kral, Stephan Thomas; Müller, Nicolas Carlo; Hann, Richard; Cheynet, Etienne; Reuder, Joachim (Journal article; Peer reviewed, 2023)
      This study presents a computational fluid dynamics (CFD) based approach to determine the optimal positioning for an atmospheric turbulence sensor on a rotary-wing uncrewed aerial vehicle (UAV) with X8 configuration. The ...

    • Fluxes of carbon and nutrients to the Iceland Sea surface layer and inferred primary productivity and stoichiometry 

      Jeansson, Emil; Bellerby, Richard; Skjelvan, Ingunn; Frigstad, Helene; Ólafsdóttir, Sólveig R.; Ólafsson, Jón Hjaltalín (Peer reviewed; Journal article, 2015-02-12)
      This study evaluates long-term mean fluxes of carbon and nutrients to the upper 100 m of the Iceland Sea. The study utilises hydro-chemical data from the Iceland Sea time series station (68.00° N, 12.67° W), for the years ...

    • Forced and internal components of observed Arctic sea-ice changes 

      Dörr, Jakob Simon; Bonan, David; Årthun, Marius; Svendsen, Lea; Wills, Robert C.J. (Journal article; Peer reviewed, 2023)
      The Arctic sea-ice cover is strongly influenced by internal variability on decadal timescales, affecting both short-term trends and the timing of the first ice-free summer. Several mechanisms of variability have been ...

    • Formation and pathways of dense water in the Nordic Seas 

      Brakstad, Ailin (Doctoral thesis, 2023-10-20)
      Sammendrag De nordiske hav er viktig for dannelsen av kalde, tette og dype vannmasser som strømmer sørover på tvers av Grønland-Skottland-ryggen og forsyner den dype grenen av omveltningssirkulasjonen i Atlanterhavet. På ...

    • Formation and pathways of dense water in the Nordic Seas based on a regional inversion 

      Brakstad, Ailin Dale; Gebbie, Geoffrey; Våge, Kjetil; Jeansson, Emil; Olafsdóttir, Solveig R. (Journal article; Peer reviewed, 2023)
      Dense waters formed in the Nordic Seas spill across gaps in the Greenland-Scotland Ridge into the abyss of the North Atlantic to feed the lower limb of the Atlantic Meridional Overturning Circulation. The overflow water ...

    • Formation of maritime convergence zones within cold air outbreaks due to the shape of the coastline or sea ice edge 

      Watanabe, Shun-ichi I.; Niino, Hiroshi; Spengler, Thomas (Journal article; Peer reviewed, 2022)
      Maritime cold air outbreaks often feature convergence zones that provide a conducive environment for the development of polar mesoscale cyclones and polar lows. This study examines the formation mechanisms of these convergence ...

    • Framework for an Ocean-Connected Supermodel of the Earth System 

      Counillon, Francois Stephane; Keenlyside, Noel Sebastian; Wang, Shuo; Devilliers, Marion; Gupta, Alok Kumar; Koseki, Shunya; Shen, Mao-Lin (Journal article; Peer reviewed, 2023)
      A supermodel connects different models interactively so that their systematic errors compensate and achieve a model with superior performance. It differs from the standard non-interactive multi-model ensembles (NI), which ...

    • A Framework for the Development, Design and Implementation of a Sustained Arctic Ocean Observing System 

      Lee, Craig M.; Starkweather, Sandy; Eicken, Hajo; Timmermans, Mary-Louise; Wilkinson, Jeremy; Sandven, Stein; Dukhovskoy, Dmitry; Gerland, Sebastian; Grebmeier, Jacqueline; Intrieri, Janet M.; Kang, Sung-Ho; McCammon, Molly; Nguyen, An T.; Polyakov, Igor; Rabe, Benjamin; Sagen, Hanne; Seeyave, Sophie; Volkov, Denis; Beszczynska-Möller, Agnieszka; Chafik, Léon; Dzieciuch, Matthew; Goni, Gustavo; Hamre, Torill; King, Andrew Luke; Olsen, Are; Raj, Roshin Pappukutty; Rossby, Thomas; Skagseth, Øystein; Søiland, Henrik; Sørensen, Kai (Peer reviewed; Journal article, 2019-08-08)
      Rapid Arctic warming drives profound change in the marine environment that have significant socio-economic impacts within the Arctic and beyond, including climate and weather hazards, food security, transportation, ...

    • Frazil ice formation in ice shelf water plume 

      Smedsrud, Lars Henrik; Jenkins, Adrian (Journal article, 2004-03-17)
      We present a model for the growth of frazil ice crystals and their accumulation as marine ice at the base of Antarctic ice shelves. The model describes the flow of buoyant water upward along the ice shelf base and includes ...

    • Frequency Regulation of Synchronous Generator 

      Sørås, Stian Jensen (Master thesis, 2017-06-20)
      The objective of this thesis is to create a Load Frequency Control (LFC) to regulate the active power output and frequency of a synchronous generator, and to conduct experiments to verify frequency stability. The electrical ...

    • Freshwater transport over the northeast Greenland shelf in Fram strait 

      Karpouzoglou, Theodoros; de Steur, Laura; Dodd, Paul (Journal article; Peer reviewed, 2023)
      We assess the contribution of flow over the Northeast Greenland Shelf (NEGS) to the total freshwater transport (FWT) through the Fram Strait. We analyze available observations since 2013 consisting of hydrographic sections, ...