Browsing Geophysical Institute by Subject "VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452"

Now showing items 21-40 of 46

    • Long-term surface pCO2 trends from observations and models 

      Tjiputra, Jerry; Olsen, Are; Bopp, Laurent; Lenton, Andrew; Pfeil, Benjamin; Roy, Tilla; Segschneider, Joachim; Totterdell, Ian; Heinze, Christoph (Peer reviewed; Journal article, 2014-05-19)
      We estimate regional long-term surface ocean pCO2 growth rates using all available underway and bottled biogeochemistry data collected over the past four decades. These observed regional trends are compared with those ...

    • Long-term trends in surface ocean pH in the North Atlantic 

      Lauvset, Siv Kari; Gruber, Nicolas (Peer reviewed; Journal article, 2014-05)
      Presently available direct pH measurements do not have a sufficient data density in space or time in order to determine long-term trends across wider geographic regions, limiting our ability to assess the magnitude and ...

    • Mixing in the stratified interface of the Faroe Bank Channel overflow: the role of transverse circulation and internal waves 

      Seim, Knut Sponheim; Fer, Ilker (Peer reviewed; Journal article, 2011-07)
      The overflow of cold water across the Faroe Bank Channel sill is a significant volume flux of dense water to the North Atlantic Ocean. Using observations of hydrography, current and microstructure from a 1 week cruise and ...

    • A model study of the seasonal and long-term North Atlantic surface pCO(2) variability 

      Tjiputra, Jerry; Olsen, Are; Assmann, Karen Margarete; Pfeil, Benjamin; Heinze, Christoph (Peer reviewed; Journal article, 2012-03-05)
      A coupled biogeochemical-physical ocean model is used to study the seasonal and long–term variations of surface pCO2 in the North Atlantic Ocean. The model agrees well with recent underway pCO2 observations from the Surface ...

    • Near-inertial mixing in the central Arctic Ocean 

      Fer, Ilker (Peer reviewed; Journal article, 2014-08)
      Observations were made in April 2007 of horizontal currents, hydrography, and shear microstructure in the upper 500 m from a drifting ice camp in the central Arctic Ocean. An approximately 4-day-long time series, collected ...

    • Observations of barotropic oscillations and their influence on mixing in the Faroe bank channel overflow region 

      Darelius, Elin Maria K.; Ullgren, Jenny; Fer, Ilker (Peer reviewed; Journal article, 2013)
      Observations of hydrography, currents, and microstructure are presented together with sea surface height (SSH) patterns from concurrent satellite tracks to describe the subinertial oscillations in the region downstream of ...

    • The ocean carbon sink - impacts, vulnerabilities and challenges 

      Heinze, Christoph; Meyer, Stefanie; Goris, Nadine; Anderson, Leif; Steinfeldt, Rainer; Chang, Nicolette; Le Quéré, Corinne; Bakker, Dorothée C.E. (Peer reviewed; Journal article, 2015-06-09)
      Carbon dioxide (CO2) is, next to water vapour, considered to be the most important natural greenhouse gas on Earth. Rapidly rising atmospheric CO2 concentrations caused by human actions such as fossil fuel burning, land-use ...

    • OceanGliders: A component of the integrated GOOS 

      Testor, Pierre; DeYoung, Brad; Rudnick, Daniel L.; Glenn, Scott; Hayes, Daniel; Lee, Craig; Pattiaratchi, Charitha B.; Hill, Katherine L.; Heslop, Emma; Turpin, Victor; Alenius, Pekka; Barrera, Carlos; Barth, John; Beaird, Nicholas; Becu, Guislain; Bosse, Anthony; Bourrin, François; Brearley, Alex; Chao, Yi; Chen, Sue; Chiggiato, Jacopo; Coppola, Laurent; Crout, Richard; Cummings, James; Curry, Beth; Curry, Ruth; Davis, Richard; Desai, Kruti; DiMarco, Steven; Edwards, Catherine; Fielding, Sophie; Fer, Ilker; Frajka-Williams, Eleanor; Gildor, Hezi; Goni, Gustavo; Gutierrez, Dimitri; Hanson, Stephanie; Haugan, Peter M.; Hebert, David; Heiderich, Joleen; Heywood, Karen J.; Hogan, Patrick; Houpert, Loïc; Huh, Sik; Inall, Mark E.; Ishii, Masso; Ito, Schin-ichi; Itoh, Sachihiko; Jan, Sen; Kaiser, Jan; Karstensen, Johannes; Kirkpatrick, Barbara; Klymak, Jody; Kohut, Josh; Krahmann, Gerd; Krug, Marjolaine; McClatchie, Sam; Marin, Frederic; Mauri, Elena; Mehra, Avichal; Meredith, Michael P.; Miles, Travis; Morell, Julio; Mortier, Laurent; Nicholson, Sarah; O'Callaghan, Joanne; O'Conchubhair, Diarmuid; Oke, Peter R.; Sanz, Enric P.; Palmer, Matthew; Park, JongJin; Perivoliotis, Leonidas; Poulain, Pierre-Marie; Perry, Ruth; Queste, Bastien; Rainville, Luc; Rehm, Eric; Roughan, Moninya; Rome, Nicholas; Ross, Tetjana; Ruiz, Simon; Saba, Grace; Schaeffer, Amandine; Schonau, Martha; Schroeder, Katrin; Shimizu, Yugo; Sloyan, Bernadette M.; Smeed, David; Snowden, Derrick P.; Song, Yumi; Swart, Sebastiaan; Tenreiro, Miguel; Thompson, Andrew F.; Tintore, Joaquin; Todd, Robert E.; Toro, Cesar; Venables, Hugh; Waterman, Stephanie; Watlington, Roy; Wilson, Doug (Peer reviewed; Journal article, 2019-10-02)
      The OceanGliders program started in 2016 to support active coordination and enhancement of global glider activity. OceanGliders contributes to the international efforts of the Global Ocean Observation System (GOOS) for ...

    • On the future of Argo: A global, full-depth, multi-disciplinary array 

      Roemmich, Dean; Alford, Matthew H.; Claustre, Herve; Johnson, Kenneth S.; King, Brian; Moum, James; Oke, Peter R.; Owens, W. Brechner; Pouliquen, Sylvie; Purkey, Sarah; Scanderbeg, Megan; Suga, Toshio; Wijffels, Susan E.; Zilberman, Nathalie; Bakker, Dorothee; Baringer, Molly O.; Belbeoch, Mathieu; Bittig, Henry C.; Boss, Emmanuel; Calil, Paulo; Carse, Fiona; Carval, Thierry; Chai, Fei; Conchubhair, Diarmuid Ó.; D'Ortenzio, Fabrizio; Dall'Olmo, Giorgio; Desbruyeres, Damien; Fennel, Katja; Fer, Ilker; Ferrari, Raffaele; Forget, Gael; Freeland, Howard; Fujiki, Tetsuichi; Gehlen, Marion; Greenan, Blair; Hallberg, Robert; Hibiya, Toshiyuki; Hosoda, Shigeki; Jayne, Steven; Jochum, Markus; Johnson, Gregory C.; Kang, KiRyong; Kolodziejczyk, Nicolas; Körtzinger, Arne; Le Traon, Pierre-Yves; Lenn, Yueng-Djern; Maze, Guillaume; Mork, Kjell Arne; Morris, Tamaryn; Nagai, Takeyoshi; Nash, Jonathan; Garabato, Alberto N.; Olsen, Are; Pattabhi, Rama R.; Prakash, Satya; Riser, Stephen; Schmechtig, Catherin; Shroyer, Emily; Sterl, Andreas; Sutton, Philip; Talley, Lynne; Tanhua, Toste; Thierry, Virginie; Thomalla, Sandy; Toole, John; Troisi, Ariel; Trull, Thomas W.; Turton, Jonathan D.; Vélez-Belchi, Pedro Joaquin; Walczowski, Waldemar; Wang, Haili; Wanninkhof, Rik; Waterhouse, Amy F.; Watson, Andrew; Wilson, Cara; Wong, Annie P.S.; Xu, Jianping; Yasuda, Ichiro (Peer reviewed; Journal article, 2019-08-02)
      The Argo Program has been implemented and sustained for almost two decades, as a global array of about 4000 profiling floats. Argo provides continuous observations of ocean temperature and salinity versus pressure, from ...

    • Particle aggregation at the edges of anticyclonic eddies and implications for distribution of biomass 

      Samuelsen, Annette; Hjøllo, Solfrid Sætre; Johannessen, Johnny Andre; Patel, Ruben (Peer reviewed; Journal article, 2012-06-14)
      Acoustic measurements show that the biomass of zooplankton and mesopelagic fish is redistributed by mesoscale variability and that the signal extends over several hundred meters depth. The mechanisms governing this ...

    • Productivity in the Barents Sea - Response to recent climate variability 

      Dalpadado, Padmini; Arrigo, Kevin R.; Hjøllo, Solfrid Sætre; Rey, Francisco; Ingvaldsen, Randi; Sperfeld, Erik; van Dijken, Gert L.; Stige, Leif Christian; Olsen, Are; Ottersen, Geir (Peer reviewed; Journal article, 2014-05-01)
      The temporal and spatial dynamics of primary and secondary biomass/production in the Barents Sea since the late 1990s are examined using remote sensing data, observations and a coupled physical-biological model. Field ...

    • Projected pH reductions by 2100 might put deep North Atlantic biodiversity at risk 

      Gehlen, Marion; Séférian, Roland; Jones, Daniel O.B.; Roy, Tilla; Roth, Raphael; Barry, James P.; Bopp, Laurent; Doney, Scott C.; Dunne, John P.; Heinze, Christoph; Joos, Fortunat; Orr, James C.; Resplandy, Laure; Segschneider, Joachim; Tjiputra, Jerry (Peer reviewed; Journal article, 2014-12-11)
      This study aims to evaluate the potential for impacts of ocean acidification on North Atlantic deep-sea ecosystems in response to IPCC AR5 Representative Concentration Pathways (RCPs). Deep-sea biota is likely highly ...

    • Recent wind driven high sea ice area export in the Fram Strait contributes to Arctic sea ice decline 

      Smedsrud, Lars Henrik; Sirevaag, Anders; Kloster, Kjell; Sorteberg, Asgeir; Sandven, Stein (Peer reviewed; Journal article, 2011-10-14)
      Arctic sea ice area has been decreasing for the past two decades. Apart from melting, the southward drift through Fram Strait is the main ice loss mechanism. We present high resolution sea ice drift data across 79° N from ...

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

    • Response of Arctic Ocean stratification to changing river runoff in a column model 

      Nummelin, Aleksi; Li, Camille; Smedsrud, Lars Henrik (Peer reviewed; Journal article, 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 ...

    • Seasonal-to-decadal predictions with the ensemble kalman filter and the Norwegian earth System Model: A twin experiment 

      Counillon, Francois; Bethke, Ingo; Keenlyside, Noel; Bentsen, Mats; Bertino, Laurent; Zheng, Fei (Peer reviewed; Journal article, 2014-03-10)
      Here, we firstly demonstrate the potential of an advanced flow dependent data assimilation method for performing seasonal-to-decadal prediction and secondly, reassess the use of sea surface temperature (SST) for initialisation ...

    • Stratified flow over complex topography: A model study of the bottom drag and associated mixing 

      Seim, Knut Sponheim; Fer, Ilker; Avlesen, Helge (Peer reviewed; Journal article, 2012-02)
      The flow of stratified fluid over complex topography may lead to a significant drag on the fluid, exerted by the bottom obstacles. Using a 2-m resolution, three-dimensional, non-hydrostatic numerical ocean model, the drag ...

    • Tidally induced internal motion in an Arctic fjord 

      Støylen, Eivind; Fer, Ilker (Peer reviewed; Journal article, 2014-01-10)
      The internal response in a stratified, partially enclosed basin subject to semi-diurnal tidal forcing through a narrow entrance is investigated. The site is located above the critical latitude where linear internal waves ...

    • 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 ...

    • 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 ...