Sea ice and millennial-scale climate variability in the Nordic seas 90 kyr ago to present

In the light of rapidly diminishing sea ice cover in the Arctic during the present atmospheric warming, it is imperative to study the distribution of sea ice in the past in relation to rapid climate change. Here we focus on glacial millennial-scale climatic events (Dansgaard/Oeschger events) using t...

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Bibliographic Details
Published in:Nature communications 2016-07, Vol.7 (1), p.12247-12247, Article 12247
Main Authors: Hoff, Ulrike, Rasmussen, Tine L., Stein, Ruediger, Ezat, Mohamed M., Fahl, Kirsten
Format: Article
Language:English
Subjects:
704/106/125
704/106/2738
704/106/413
Climate change
Cold
Cooling
Geofag: 450
Humanities and Social Sciences
Kvartærgeologi, glasiologi: 465
Marin geologi: 466
Matematikk og Naturvitenskap: 400
multidisciplinary
Productivity
Science
Science (multidisciplinary)
Sediments
Surface water
VDP
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Summary:In the light of rapidly diminishing sea ice cover in the Arctic during the present atmospheric warming, it is imperative to study the distribution of sea ice in the past in relation to rapid climate change. Here we focus on glacial millennial-scale climatic events (Dansgaard/Oeschger events) using the sea ice proxy IP 25 in combination with phytoplankton proxy data and quantification of diatom species in a record from the southeast Norwegian Sea. We demonstrate that expansion and retreat of sea ice varies consistently in pace with the rapid climate changes 90 kyr ago to present. Sea ice retreats abruptly at the start of warm interstadials, but spreads rapidly during cooling phases of the interstadials and becomes near perennial and perennial during cold stadials and Heinrich events, respectively. Low-salinity surface water and the sea ice edge spreads to the Greenland–Scotland Ridge, and during the largest Heinrich events, probably far into the Atlantic Ocean. The response of Arctic sea-ice to rapid climatic change in the past remains uncertain. Here, the authors use biomarkers and microfossils to reconstruct Arctic sea-ice changes over the past 90,000 years, and demonstrate millennial-scale variability.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms12247