Blar i forfatter "Assmy, Philipp Kurt Wolf"

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    • Assessing net primary production in the northwestern Barents Sea using in situ, remote sensing and modelling approaches 

      Castro de la Guardia, Laura; Hernández Fariñas, Tania; Marchese, Christian; Amargant I Arumi, Marti; Myers, Paul G.; Bélanger, Simon; Assmy, Philipp Kurt Wolf; Gradinger, Rolf Rudolf; Duarte, Pedro (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-24)
      The northwestern Barents Sea (NW-BS) is a highly productive region within the transitional zones of an Atlantic to Arctic-dominated marine ecosystem. The steep latitudinal gradients in sea ice concentration, Atlantic and Arctic Water, offer an opportunity to test hypotheses on physical drivers of spatial and temporal variability of net primary production (NPP). However, quantifying NPP in such a ...

    • From Winter to Late Summer in the Northwestern Barents Sea Shelf: Impacts of Seasonal Progression of Sea Ice and Upper Ocean on Nutrient and Phytoplankton Dynamics 

      Koenig, Zoe Charlotte; Muilwijk, Morven; Sandven, Håkon Johan; Lundesgaard, Øyvind; Assmy, Philipp Kurt Wolf; Lind, Sigrid Gjessing; Assmann, Karen; Chierici, Melissa; Fransson, Agneta; Gerland, Sebastian; Jones, Elizabeth Marie; Renner, Angelika; Granskog, Mats (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-11)
      Strong seasonality is a key feature of high-latitude systems like the Barents Sea. While the interannual variability and long-term changes of the Barents Sea are well-documented, the seasonal progression of the physical and biological systems is less known, mainly due to poor accessibility of the seasonally ice-covered area in winter and spring. Here, we use an extensive set of physical and biological ...

    • The impacts of tidewater glacier retreat on functioning of Arctic fjords: observations and modeling 

      Duarte, Pedro; Assmy, Philipp Kurt Wolf; Hop, Haakon; Marnela, Marika; Moreau, Sebastien (Conference object; Konferansebidrag, 2024)
      The main goals of this study are to discuss the effects of tidewater glacier retreat on fjord biogeochemistry based on observational and modeling evidence collected in Kongsfjorden, Svalbard, and on published studies. We here present a fjord conceptual model, including a benthic compartment, to visualize the biogeochemical fluxes between the sediments and the water column.

    • Interannual differences in sea ice regime in the north-western Barents Sea cause major changes in summer pelagic production and export mechanisms 

      Amargant I Arumi, Marti; Müller, Oliver; Bodur, Yasemin Vicdan; Ntinou, Iliana Vasiliki; Vonnahme, Tobias; Assmy, Philipp Kurt Wolf; Kohlbach, Doreen; Chierici, Melissa; Jones, Elizabeth Marie; Olsen, Lasse Mork; Tsagaraki, Tatiana; Reigstad, Marit; Bratbak, Gunnar; Gradinger, Rolf Rudolf (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-22)
      The Barents Sea is a highly dynamic and productive marine ecosystem and a hotspot of global warming. Variability in sea ice extent is a common feature in the Barents Sea with substantial movements of the sea ice edge on short-term, seasonal to interannual time scales. Historically the northern Barents Sea (north of 75◦N) has been ice-covered in winter, but recently it has become the area with most ...

    • Photophysiological responses of bottom sea-ice algae to fjord dynamics and rapid freshening 

      Forgereau, Zoé Lulu; Lange, Benjamin Allen; Gradinger, Rolf Rudolf; Assmy, Philipp Kurt Wolf; Osanen, Janina; Martín, Laura; Søreide, Janne; Granskog, Mats; Leu, Eva; Campbell, Karley Lynn (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-13)
      Sea ice algae have a broad salinity tolerance but can experience stress during rapid decreases in salinity that occur with seasonal ice melt and during ice sample melt. This study investigated the impact of salinity on the photophysiological responses of bottom-ice algal communities from two Svalbard fjords (Tempelfjorden and Van Mijenfjorden). To further investigate the impact of salinity alone, ...

    • Seasonal dynamics of sea-ice protist and meiofauna in the northwestern Barents Sea 

      Marquardt, Miriam; Goraguer, Lucie Hélène Marie; Assmy, Philipp Kurt Wolf; Bluhm, Bodil Annikki Ulla Barbro; Aaboe, Signe; Down, Emily; Patrohay, Evan; Edvardsen, Bente; Tatarek, Agnieszka; Smola, Zofia; Wiktor, Józef; Gradinger, Rolf Rudolf (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-27)
      The rapid decline of Arctic sea ice makes understanding sympagic (ice-associated) biology a particularly urgent task. Here we studied the poorly known seasonality of sea-ice protist and meiofauna community composition, abundance and biomass in the bottom 30 cm of sea ice in relation to ice properties and ice drift trajectories in the northwestern Barents Sea. We expected low abundances during the ...

    • Seasonal patterns of vertical flux in the northwestern Barents Sea under Atlantic Water influence and sea-ice decline 

      Bodur, Yasemin Vicdan; Renaud, Paul Eric; Goraguer, Lucie Hélène Marie; Amargant I Arumi, Marti; Assmy, Philipp Kurt Wolf; Dabrowska, Anna Maria; Marquardt, Miriam; Renner, Angelika; Tatarek, Agnieska; Reigstad, Marit (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-27)
      The northern Barents Sea is a productive Arctic inflow shelf with a seasonal ice cover and as such, a location with an efficient downward export of particulate organic matter through the biological carbon pump. The region is under strong influence of Atlantification and sea-ice decline, resulting in a longer open water and summer period. In order to understand how these processes influence the ...