Blar i forfatter "Jansson, Pær"

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    • Extensive release of methane from Arctic seabed west of Svalbard during summer 2014 does not influence the atmosphere 

      Myhre, Cathrine Lund; Ferré, Benedicte; Platt, Stephen Matthew; Silyakova, Anna; Hermansen, Ove; Allen, Grant; Pisso, Ignacio; Schmidbauer, Josef Norbert; Stohl, Andreas; Pitt, Joseph R.; Jansson, Pær; Greinert, Jens; Percival, Carl; Fjæraa, Ann Mari; O'Shea, Sebastian J.; Gallagher, Martin; Le Breton, Michael; Bower, Keith N.; Bauguitte, Stéphane Jean-Bernard; Dalsøren, Stig Bjørløw; Vadakkepuliyambatta, Sunil; Fisher, Rebecca E.; Nisbet, Euan G.; Lowry, David; Myhre, Gunnar; Pyle, John Adrian; Cain, Michelle; Mienert, Jurgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-07)
      We find that summer methane (CH4) release from seabed sediments west of Svalbard substantially increases CH4 concentrations in the ocean but has limited influence on the atmospheric CH4 levels. Our conclusion stems from complementary measurements at the seafloor, in the ocean, and in the atmosphere from land-based, ship and aircraft platforms during a summer campaign in 2014. We detected high ...

    • SUB-OCEAN: subsea dissolved methane measurements using an embedded laser spectrometer technology 

      Grilli, Roberto; Triest, Jack; Chappellaz, Jérôme; Calzas, Michel; Desbois, Thibault; Jansson, Pær; Guillerm, Christophe; Ferré, Benedicte; Lechevallier, Loïc; Ledoux, Victor; Romanini, Daniele (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-16)
      We present a novel instrument, the Sub-Ocean probe, allowing in situ and continuous measurements of dissolved methane in seawater. It relies on an optical feedback cavity enhanced absorption technique designed for trace gas measurements and coupled to a patent-pending sample extraction method. The considerable advantage of the instrument compared with existing ones lies in its fast response time of ...

    • Tidal Energy Loss, Internal Tide Radiation, and Local Dissipation for Two-Layer Tidal Flow over a Sill 

      Arneborg, Lars; Jansson, Pær; Staalstrøm, Andre; Broström, Göran (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-14)
      A simple analytical model for tidal energy loss at fjord sills and its partitioning into local dissipation and radiated internal tides is presented. The analytical model builds on a two-layer assumption with quasi-steady nonlinear flow over the sill and wave radiation in the far field. When the interface is situated above sill level, upstream- and downstream-propagating internal waves are generated ...