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The nature of MIS 3...
The nature of MIS 3 stadial-interstadial transitions in Europe : New insights from model-data comparisons
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Van Meerbeeck, C. J. (författare)
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Renssen, H. (författare)
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Roche, D. M. (författare)
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- Wohlfarth, Barbara (författare)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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Bohncke, S. J. P. (författare)
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Bos, J. A. A. (författare)
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Engels, S. (författare)
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- Helmens, Karin F. (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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Sanchez-Goni, M. F. (författare)
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Svensson, A. (författare)
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Vandenberghe, J. (författare)
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(creator_code:org_t)
- Elsevier BV, 2011
- 2011
- Engelska.
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Ingår i: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791 .- 1873-457X. ; 30:25-26, s. 3618-3637
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 15 abrupt warming transitions perturbed glacial climate in Greenland during Marine Isotope Stage 3 (MIS 3, 60-27 ka BP). One hypothesis states that the 8-16 degrees C warming between Greenland Stadials (GS) and Interstadials (GI) was caused by enhanced heat transport to the North Atlantic region after a resumption of the Atlantic Meridional Overturning Circulation (AMOC) from a weak or shutdown stadial mode. This hypothesis also predicts warming over Europe, a prediction poorly constrained by data due to the paucity of well-dated quantitative temperature records. We therefore use a new evidence from biotic proxies and a climate model simulation to study the characteristics of a GS-GI transition in continental Europe and the link to enhanced AMOC strength. We compare reconstructed climatic and vegetation changes between a stadial and subsequent interstadial - correlated to GS15 and GI14 (similar to 55 ka BP) - with a simulated AMOC resumption using a three-dimensional earth system model setup with early-MIS 3 boundary conditions. Over western Europe (12 degrees W-15 degrees E), we simulate twice the annual precipitation, a 17 degrees C warmer coldest month, a 8 degrees C warmer warmest month, 1300 degrees C-day more growing degree days with baseline 5 degrees C (GDD5) and potential vegetation allowing tree cover after the transition. However, the combined effect of frequent killing frosts, <20 mm summer precipitation and too few GDD5 after the transition suggest a northern tree limit lying at similar to 50 degrees N during GI14. With these 3 climatic limiting factors we provide a possible explanation for the absence of forests north of 48 degrees N during MIS 3 interstadials with mild summers. Finally, apart from a large model bias in warmest month surface air temperatures, our simulation is in reasonable agreement with reconstructed climatic and vegetation changes in Europe, thus further supporting the hypothesis.
Nyckelord
- Abrupt climate change
- Last glacial period
- Marine Isotope Stage 3
- Palaeoclimate modelling
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Van Meerbeeck, C ...
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Renssen, H.
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Roche, D. M.
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Wohlfarth, Barba ...
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Bohncke, S. J. P ...
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Bos, J. A. A.
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visa fler...
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Engels, S.
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Helmens, Karin F ...
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Sanchez-Goni, M. ...
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Svensson, A.
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Vandenberghe, J.
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visa färre...
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Quaternary Scien ...
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Stockholms universitet