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The Arctic Ocean experienced significant freshwater conditions during the early Eocene, evidenced by massive Azolla fern blooms. These blooms indicate episodic freshening events linked to oceanic exchange, impacting Arctic and Nordic seas.

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Area of Science:

  • Paleoclimatology
  • Oceanography
  • Paleobotany

Background:

  • Early Paleogene (55-45 Myr ago) greenhouse conditions likely intensified the hydrological cycle at high latitudes.
  • Limited field evidence existed for Arctic oceanic conditions during this warm period.

Observation:

  • Palaeogene sediments from the Arctic Coring Expedition reveal abundant Azolla fern growth in the Arctic Ocean around 50 Myr ago.
  • Associated freshwater microfossils suggest episodic freshening of Arctic surface waters over an 800,000-year interval.

Findings:

  • Massive Azolla blooms indicate a significant freshwater event in the Eocene Arctic Ocean.
  • Transported Azolla assemblages in Nordic seas suggest freshwater spills reaching the North Sea.
  • The Azolla phase ended with a sea surface temperature rise, indicating increased oceanic inflow and salinity.

Implications:

  • The study provides crucial field evidence for Paleogene Arctic hydrological conditions.
  • Oceanic gateway dynamics controlled the onset and termination of the Eocene Azolla event.
  • Findings enhance understanding of past climate dynamics and ocean-heat-salinity feedbacks in polar regions.