Blar i forfatter "Sert, Muhammed Fatih"

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    • Biogeochemistry of dissolved organic matter in Arctic Ocean waters charged with methane 

      Sert, Muhammed Fatih (Doctoral thesis; Doktorgradsavhandling, 2022-11-25)
      Dissolved organic matter (DOM) is defined as organic matter that is smaller than a nominal pore size filter (e.g., 0.7 µm) that passes through during the filtration of aquatic samples. It comprises the largest reservoir of reduced carbon (700 Pg C) in the oceans. The DOM pool is in close interaction with all the elemental cycles and food chains in the ocean and is an essential component in the marine ...

    • Compositional differences in dissolved organic matter between Arctic cold seeps versus non-seep sites at the Svalbard continental margin and the Barents sea 

      Sert, Muhammed Fatih; D’Andrilli, Juliana; Gründger, Friederike; Niemann, Helge; Granskog, Mats; Pavlov, Alexey K.; Ferré, Benedicte; Silyakova, Anna (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-07)
      Dissociating gas hydrates, submerged permafrost, and gas bearing sediments release methane to the water column from a multitude of seeps in the Arctic Ocean. The seeping methane dissolves and supports the growth of aerobic methane oxidizing bacteria (MOB), but the effect of seepage and seep related biogeochemical processes on water column dissolved organic matter (DOM) dynamics is not well ...

    • Compositions of dissolved organic matter in the ice-covered waters above the Aurora hydrothermal vent system, Gakkel Ridge, Arctic Ocean 

      Sert, Muhammed Fatih; Niemann, Helge; Reeves, Eoghan; Granskog, Mats A.; Hand, Kevin P.; Kekäläinen, Timo; Jänis, Janne; Rossel, Pamela; Ferré, Benedicte; Silyakova, Anna; Gründger, Friederike (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-20)
      Hydrothermal vents modify and displace subsurface dissolved organic matter (DOM) into the ocean. Once in the ocean, this DOM is transported together with elements, particles, dissolved gases and biomass along with the neutrally buoyant plume layer. Considering the number and extent of actively venting hydrothermal sites in the oceans, their contribution to the oceanic DOM pool may be substantial. ...

    • Elevated methane alters dissolved organic matter composition in the Arctic Ocean cold seeps 

      Sert, Muhammed Fatih; Schweitzer, Hannah; de Groot, Tim R.; Kekäläinen, Timo; Jänis, Janne; Bernstein, Hans Christopher; Ferré, Benedicte; Gründger, Friederike; Kalenitchenko, Dimitri Stanislas Desire; Niemann, Helge (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-15)
      Cold seeps release methane (CH<sub>4</sub>) from the seafloor to the water column, which fuels microbially mediated aerobic methane oxidation (MOx). Methane-oxidising bacteria (MOB) utilise excess methane, and the MOB biomass serves as a carbon source in the food web. Yet, it remains unclear if and how MOx modifies the composition of dissolved organic matter (DOM) in cold seeps. We investigated MOx ...

    • Hot Vents Beneath an Icy Ocean: The Aurora Vent Field, Gakkel Ridge, Revealed 

      Ramirez-Llodra, Eva; Argentino, Claudio; Baker, Maria; Boetius, Antje; Costa, Carolina; Dahle, Håkon; Denny, Emily Maria; Dessandier, Pierre-Antoine; Eilertsen, Mari Heggernes; Ferré, Benedicte; German, Cristopher R.; Hand, Kevin; Hilário, Ana; Hislop, Lawrence; Jamieson, John W.; Kalnitchenko, Dimitri; Mall, Achim; Panieri, Giuliana; Purser, Autun; Ramalho, Sofia P.; Reeves, Eoghan P.; Rolley, Leigthon; Pereira, Samuel I.; Ribeiro, Pedro A.; Sert, Muhammed Fatih; Steen, Ida H.; Stetzler, Marie; Stokke, Runar; Victorero, Lissette; Vulcano, Francesca; Vågenes, Stig; Waghorn, Kate Alyse; Buenz, Stefan (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-28)
      Evidence of hydrothermal venting on the ultra-slow spreading Gakkel Ridge in the Central Arctic Ocean has been available since 2001, with first visual evidence of black smokers on the Aurora Vent Field obtained in 2014. But it was not until 2021 that the first ever remotely operated vehicle (ROV) dives to hydrothermal vents under permanent ice cover in the Arctic were conducted, enabling the ...