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Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period

  • Ezat, Mohamed M.
  • Rasmussen, Tine L.
  • Hain, Mathis P.
  • Greaves, Mervyn
  • Rae, James W. B.
  • Zamelczyk, Katarzyna
  • Marchitto, Thomas M.
  • Szidat, Sönke
  • Skinner, Luke C.
Publication Date
Jan 13, 2021
Apollo - University of Cambridge Repository
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Funder: Tromsø Research Foundation : A31720 / Abstract: The Fram Strait is the only deep gateway between the Arctic Ocean and the Nordic Seas and thus is a key area to study past changes in ocean circulation and the marine carbon cycle. Here, we study deep ocean temperature, δ18O, carbonate chemistry (i.e., carbonate ion concentration [CO32−]), and nutrient content in the Fram Strait during the late glacial (35,000–19,000 years BP) and the Holocene based on benthic foraminiferal geochemistry and carbon cycle modeling. Our results indicate a thickening of Atlantic water penetrating into the northern Nordic Seas, forming a subsurface Atlantic intermediate water layer reaching to at least ∼2,600 m water depth during most of the late glacial period. The recirculating Atlantic layer was characterized by relatively high [CO32−] and low δ13C during the late glacial, and provides evidence for a Nordic Seas source to the glacial North Atlantic intermediate water flowing at 2,000–3,000 m water depth, most likely via the Denmark Strait. In addition, we discuss evidence for enhanced terrestrial carbon input to the Nordic Seas at ∼23.5 ka. Comparing our δ13C and qualitative [CO32−] records with results of carbon cycle box modeling suggests that the total terrestrial CO2 release during this carbon input event was low, slow, or directly to the atmosphere.

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