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Warm summers during the Younger Dryas cold reversal
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. Stockholm Univ, Bolin Ctr Climate Res, Svante Arrhenius Vag 8, SE-10691 Stockholm, Sweden.;Stockholm Univ, Dept Geol Sci, Svante Arrhenius Vag 8, SE-10691 Stockholm, Sweden.ORCID iD: 0000-0002-4768-9832
Univ Helsinki, Ecosyst & Environm Res Programme, Fac Biol & Environm Sci, ECRU, POB 65, FIN-00014 Helsinki, Finland.;Univ Helsinki, Helsinki Inst Sustainabil Sci HELSUS, POB 65, FIN-00014 Helsinki, Finland..
Stockholm Univ, Bolin Ctr Climate Res, Svante Arrhenius Vag 8, SE-10691 Stockholm, Sweden.;Stockholm Univ, Dept Geol Sci, Svante Arrhenius Vag 8, SE-10691 Stockholm, Sweden.;Univ Cambridge, Dept Geog, Cambridge CB2 3EN, England.;Columbia Univ, Lamont Doherty Earth Observ, 61 Route 9 W, New York, NY 10964 USA..
Mem Univ Newfoundland, Dept Phys & Phys Oceanog, St John, NF A1B 3X7, Canada..
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 1634Article in journal (Refereed) Published
Abstract [en]

The Younger Dryas (YD) cold reversal interrupts the warming climate of the deglaciation with global climatic impacts. The sudden cooling is typically linked to an abrupt slowdown of the Atlantic Meridional Overturning Circulation (AMOC) in response to meltwater discharges from ice sheets. However, inconsistencies regarding the YD-response of European summer temperatures have cast doubt whether the concept provides a sufficient explanation. Here we present results from a high-resolution global climate simulation together with a new July temperature compilation based on plant indicator species and show that European summers remain warm during the YD. Our climate simulation provides robust physical evidence that atmospheric blocking of cold westerly winds over Fennoscandia is a key mechanism counteracting the cooling impact of an AMOC-slowdown during summer. Despite the persistence of short warm summers, the YD is dominated by a shift to a continental climate with extreme winter to spring cooling and short growing seasons.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 9, article id 1634
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Climate Research
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URN: urn:nbn:se:kth:diva-227217DOI: 10.1038/s41467-018-04071-5ISI: 000430674000023PubMedID: 29691388Scopus ID: 2-s2.0-85045988355OAI: oai:DiVA.org:kth-227217DiVA, id: diva2:1206517
Note

QC 20180517

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved

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Johansson, Arne V.

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