Annual cycle of downward particle fluxes on each side of the Gakkel Ridge in the central Arctic Ocean

Eva-Maria Nöthig, Catherine Lalande, Kirsten Fahl, Katja Metfies, Ian Salter, Eduard Bauerfeind

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Two mooring arrays carrying sediment traps were deployed from September 2011 to August 2012 at ∼83°N on each side of the Gakkel Ridge in the Nansen and Amundsen Basins to measure downward particle flux below the euphotic zone (approx. 250 m) and approximately 150m above seafloor at approximately
3500 and 4000m depth, respectively. In a region that still experiences nearly complete ice cover throughout the year, export fluxes of total particulate matter (TPM), particulate organic carbon (POC), particulate nitrogen (PN), biogenic matter, lithogenic matter, biogenic particulate silica (bPSi), calcium carbonate (CaCO3), protists and biomarkers only slightly decreased with depth. Seasonal variations of particulate matter fluxes were similar on both sides of the Gakkel Ridge. Somewhat higher export rates in the Amundsen Basin and differences in
the composition of the sinking TPM and bPSi on each side of the Gakkel Ridge probably reflected the influence of the Lena River/Transpolar Drift in the Amundsen Basin and the influence of Atlantic water in the Nansen Basin. Low variations in particle export with depth revealed a limited influence of lateral advection in the deep barren Eurasian Basin.
Original languageEnglish
Article number20190368
Pages (from-to)1-12
Number of pages12
JournalPhilosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences
Publication statusPublished - 2 Oct 2020


  • Biological carbon pump
  • Sediment trap
  • Arctic
  • Sea-ice
  • FRAM
  • Autonomous sampling
  • Pelagic-Benthic coupling
  • Diatom
  • Phytoplankton


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