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The complexity of millennial-scale variability in southwestern Europe during MIS 11

Published online by Cambridge University Press:  20 January 2017

Dulce Oliveira*
EPHE, PSL Research University, Laboratoire Paléoclimatologie et Paléoenvironnements Marins, F-33615 Pessac, France Univ. Bordeaux, EPOC, UMR 5805, F-33615 Pessac, France Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Avenida de Brasília 6, 1449-006 Lisboa, Portugal CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
Stephanie Desprat
EPHE, PSL Research University, Laboratoire Paléoclimatologie et Paléoenvironnements Marins, F-33615 Pessac, France Univ. Bordeaux, EPOC, UMR 5805, F-33615 Pessac, France
Teresa Rodrigues
Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Avenida de Brasília 6, 1449-006 Lisboa, Portugal CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
Filipa Naughton
Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Avenida de Brasília 6, 1449-006 Lisboa, Portugal CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
David Hodell
Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, UK
Ricardo Trigo
Instituto Dom Luiz, Universidade de Lisboa, 1749-016 Lisboa, Portugal
Marta Rufino
Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Avenida de Brasília 6, 1449-006 Lisboa, Portugal CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
Cristina Lopes
Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Avenida de Brasília 6, 1449-006 Lisboa, Portugal CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
Fatima Abrantes
Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Avenida de Brasília 6, 1449-006 Lisboa, Portugal CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
Maria Fernanda Sánchez Goni
EPHE, PSL Research University, Laboratoire Paléoclimatologie et Paléoenvironnements Marins, F-33615 Pessac, France Univ. Bordeaux, EPOC, UMR 5805, F-33615 Pessac, France
*Corresponding author. EPHE, PSL Research University, Laboratoire Paléoclimatologie et Paléoenvironnements Marins, F-33615 Pessac, France. E-mail Oliveira)


Climatic variability of Marine Isotope Stage (MIS) 11 is examined using a new high-resolution direct land—sea comparison from the SW Iberian margin Site U1385. This study, based on pollen and biomarker analyses, documents regional vegetation, terrestrial climate and sea surface temperature (SST) variability. Suborbital climate variability is revealed by a series of forest decline events suggesting repeated cooling and drying episodes in SW Iberia throughout MIS 11. Only the most severe events on land are coeval with SST decreases, under larger ice volume conditions. Our study shows that the diverse expression (magnitude, character and duration) of the millennial-scale cooling events in SW Europe relies on atmospheric and oceanic processes whose predominant role likely depends on baseline climate states. Repeated atmospheric shifts recalling the positive North Atlantic Oscillation mode, inducing dryness in SW Iberia without systematical SST changes, would prevail during low ice volume conditions. In contrast, disruption of the Atlantic meridional overturning circulation (AMOC), related to iceberg discharges, colder SST and increased hydrological regime, would be responsible for the coldest and driest episodes of prolonged duration in SW Europe.

Research Article
Copyright © University of Washington 2016

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