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Resumen: Greenland Stadial 1 (GS-1) was the last of a long series of severe cooling episodes in the Northern Hemisphere during the last glacial period. Numerous North Atlantic and European records reveal the intense environmental impact of that stadial, whose origin is attributed to an intense weakening of the Atlantic Meridional Overturning Circulation in response to freshening of the North Atlantic. Recent high-resolution studies of European lakes revealed a mid-GS-1 transition in the climatic regimes. The geographical extension of such atmospheric changes and their potential coupling with ocean dynamics still remains unclear. Here we use a subdecadally resolved stalagmite record from the Northern Iberian Peninsula to further investigate the timing and forcing of this transition. A solid interpretation of the environmental changes detected in this new, accurately dated, stalagmite record is based on a parallel cave monitoring exercise. This record reveals a gradual transition from dry to wet conditions starting at 12,500 y before 2000 A.D. in parallel to a progressive warming of the subtropical Atlantic Ocean. The observed atmospheric changes are proposed to be led by a progressive resumption of the North Atlantic convection and highlight the complex regional signature of GS-1, very distinctive from previous stadial events.
Idioma: Inglés
DOI: 10.1073/pnas.1503990112
Año: 2015
Publicado en: Proceedings of the National Academy of Sciences 112, 21 (2015), 6568-6572
ISSN: 0027-8424
Factor impacto JCR: 9.423 (2015)
Categ. JCR: MULTIDISCIPLINARY SCIENCES rank: 4 / 60 = 0.067 (2015) - Q1 - T1
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2009-10455-BTE
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2010-16376
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CUEVAS PPNN-258-2011
Tipo y forma: Comunicación congreso (Versión definitiva)
Área (Departamento): Geodinámica Externa (Departamento de Ciencias de la Tierra)

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