Variability of the North Atlantic Oscillation over the past 5,200 years
Climate in the Arctic region and northwestern Europe is strongly affected by the North Atlantic Oscillation(1,2) (NAO), the dominant mode of atmospheric variability at mid-latitudes in the North Atlantic region. The NAO index is an indicator of atmospheric circulation and weather patterns: when the...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/d7adf4de-2530-458d-973a-4eb40d323d1d 2023-11-12T04:13:17+01:00 Variability of the North Atlantic Oscillation over the past 5,200 years Olsen, Jesper Anderson, N. John Knudsen, Mads Faurschou 2012-11 https://pure.au.dk/portal/da/publications/variability-of-the-north-atlantic-oscillation-over-the-past-5200-years(d7adf4de-2530-458d-973a-4eb40d323d1d).html https://doi.org/10.1038/NGEO1589 eng eng https://pure.au.dk/portal/da/publications/variability-of-the-north-atlantic-oscillation-over-the-past-5200-years(d7adf4de-2530-458d-973a-4eb40d323d1d).html info:eu-repo/semantics/restrictedAccess Olsen , J , Anderson , N J & Knudsen , M F 2012 , ' Variability of the North Atlantic Oscillation over the past 5,200 years ' , Nature Geoscience , vol. 5 , no. 11 , pp. 808-812 . https://doi.org/10.1038/NGEO1589 article 2012 ftuniaarhuspubl https://doi.org/10.1038/NGEO1589 2023-11-01T23:58:42Z Climate in the Arctic region and northwestern Europe is strongly affected by the North Atlantic Oscillation(1,2) (NAO), the dominant mode of atmospheric variability at mid-latitudes in the North Atlantic region. The NAO index is an indicator of atmospheric circulation and weather patterns: when the index is positive, Europe and the eastern US are mild and wet, whereas Greenland and northern Canada are cold and dry. A negative index is associated with the reverse pattern. Reconstructions of the NAO have so far been limited to the past 900 years(3). Here we analyse a 5,200-year-long, high-resolution lake sediment record from southwestern Greenland to reconstruct lake hypolimnic anoxia, and link the results to an existing reconstruction of the NAO index from tree rings and speleothems(3). Using the relationship between the two records, we find that around 4,500 and 650 years ago-around the end of the Holocene Thermal Maximum and the beginning of the Little Ice Age, respectively-the NAO changed from generally positive to variable, intermittently negative conditions. We suggest that variability in the dominant state of the NAO tend to coincide with large-scale changes in Northern Hemisphere climate. However, the onset of the Medieval Climate Anomaly was not associated with any notable changes in the NAO. Article in Journal/Newspaper Arctic Greenland North Atlantic North Atlantic oscillation Aarhus University: Research Arctic Canada Greenland Nature Geoscience 5 11 808 812 |
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ftuniaarhuspubl |
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English |
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Climate in the Arctic region and northwestern Europe is strongly affected by the North Atlantic Oscillation(1,2) (NAO), the dominant mode of atmospheric variability at mid-latitudes in the North Atlantic region. The NAO index is an indicator of atmospheric circulation and weather patterns: when the index is positive, Europe and the eastern US are mild and wet, whereas Greenland and northern Canada are cold and dry. A negative index is associated with the reverse pattern. Reconstructions of the NAO have so far been limited to the past 900 years(3). Here we analyse a 5,200-year-long, high-resolution lake sediment record from southwestern Greenland to reconstruct lake hypolimnic anoxia, and link the results to an existing reconstruction of the NAO index from tree rings and speleothems(3). Using the relationship between the two records, we find that around 4,500 and 650 years ago-around the end of the Holocene Thermal Maximum and the beginning of the Little Ice Age, respectively-the NAO changed from generally positive to variable, intermittently negative conditions. We suggest that variability in the dominant state of the NAO tend to coincide with large-scale changes in Northern Hemisphere climate. However, the onset of the Medieval Climate Anomaly was not associated with any notable changes in the NAO. |
format |
Article in Journal/Newspaper |
author |
Olsen, Jesper Anderson, N. John Knudsen, Mads Faurschou |
spellingShingle |
Olsen, Jesper Anderson, N. John Knudsen, Mads Faurschou Variability of the North Atlantic Oscillation over the past 5,200 years |
author_facet |
Olsen, Jesper Anderson, N. John Knudsen, Mads Faurschou |
author_sort |
Olsen, Jesper |
title |
Variability of the North Atlantic Oscillation over the past 5,200 years |
title_short |
Variability of the North Atlantic Oscillation over the past 5,200 years |
title_full |
Variability of the North Atlantic Oscillation over the past 5,200 years |
title_fullStr |
Variability of the North Atlantic Oscillation over the past 5,200 years |
title_full_unstemmed |
Variability of the North Atlantic Oscillation over the past 5,200 years |
title_sort |
variability of the north atlantic oscillation over the past 5,200 years |
publishDate |
2012 |
url |
https://pure.au.dk/portal/da/publications/variability-of-the-north-atlantic-oscillation-over-the-past-5200-years(d7adf4de-2530-458d-973a-4eb40d323d1d).html https://doi.org/10.1038/NGEO1589 |
geographic |
Arctic Canada Greenland |
geographic_facet |
Arctic Canada Greenland |
genre |
Arctic Greenland North Atlantic North Atlantic oscillation |
genre_facet |
Arctic Greenland North Atlantic North Atlantic oscillation |
op_source |
Olsen , J , Anderson , N J & Knudsen , M F 2012 , ' Variability of the North Atlantic Oscillation over the past 5,200 years ' , Nature Geoscience , vol. 5 , no. 11 , pp. 808-812 . https://doi.org/10.1038/NGEO1589 |
op_relation |
https://pure.au.dk/portal/da/publications/variability-of-the-north-atlantic-oscillation-over-the-past-5200-years(d7adf4de-2530-458d-973a-4eb40d323d1d).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1038/NGEO1589 |
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Nature Geoscience |
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