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Rapid climatic shifts during isotope stages 2–4 in the Polar North Atlantic

1996; Geological Society of America; Volume: 24; Issue: 7 Linguagem: Inglês

10.1130/0091-7613(1996)024 2.3.co;2

1943-2682

Trond Dokken, Morten Hald,

Arctic and Antarctic ice dynamics

Research Article| July 01, 1996 Rapid climatic shifts during isotope stages 2–4 in the Polar North Atlantic Trond M. Dokken; Trond M. Dokken 1University of Tromsø, 9037 Tromsø, Norway Search for other works by this author on: GSW Google Scholar Morten Hald Morten Hald 1University of Tromsø, 9037 Tromsø, Norway Search for other works by this author on: GSW Google Scholar Author and Article Information Trond M. Dokken 1University of Tromsø, 9037 Tromsø, Norway Morten Hald 1University of Tromsø, 9037 Tromsø, Norway Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (7): 599–602. https://doi.org/10.1130/0091-7613(1996)024 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Trond M. Dokken, Morten Hald; Rapid climatic shifts during isotope stages 2–4 in the Polar North Atlantic. Geology 1996;; 24 (7): 599–602. doi: https://doi.org/10.1130/0091-7613(1996)024 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Sediment cores from the Polar North Atlantic provide evidence of six periods of sea-ice breakup during isotope stages 4, 3, and 2, probably caused by inflow of North Atlantic surface water into the Polar North Atlantic. These periods are characterized by having a high number of foraminifera/g; they last from 2000 to >10000 yr, and constitute ≈ 50% of the total time span. These periods of sea-ice breakup correlate temporarily to the Heinrich events and the early temperature maximum in the Bond cycles of the North Atlantic and Greenland ice record. Our hypothesis is that massive iceberg discharges that flooded the North Atlantic during each Heinrich event probably triggered an oceanographic regime that gave a much more vigorous surface circulation pattern in the Polar North Atlantic, which contributed to the breakup of the sea-ice cover. Open-water conditions in the Polar North Atlantic are inversely related to terrestrial interstadials of coastal Norway, suggesting ice-sheet starvation during the cold periods and ice-sheet growth when an open-water surface circulation existed in the Polar North Atlantic. Our data document synchronous variations on a October 1900 yr time scale between Arctic oceanic climate, Northern Hemisphere ice-sheet dynamics, and ocean-atmosphere temperature changes. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.