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Climate Variability in the North-Western Iberian Peninsula During the Last Deglaciation

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Oceans and the Atmospheric Carbon Content

Abstract

Vegetation reconstruction from north-western Portugal estuarine cores reflects millennial- to centennial-scale climate variability during the Last ­Glacial–Interglacial Transition (LGIT) in the Douro basin. These vegetation cover changes match perfectly the climatic pattern detected in the North Atlantic region and in Greenland. Changes between high and weak forested phases in the Douro basin are associated with warm and cold episodes, respectively.

The first warm episode, the Bölling, occurring within the LGIT, follows the Oldest Dryas episode (terrestrial equivalent of the marine Heinrich 1 event) and was characterised by the expansion of pine, oak and birch. Subsequently, a rapid climate reversal was revealed by the contraction of that arboreal association and increase of herbaceous taxa probably reflecting the centennial-scale Older Dryas episode (one of the well-known Intra Bölling-Allerød cold events). The Allerød event, representing the subsequent warming phase, was characterised by the expansion of alder ­followed by pine. Afterwards, an abrupt cooling occurred, evidenced by the replacement of temperate trees (pine and oak) by herbaceous plants (compositae and grasses), reflecting the Younger Dryas cold event. Finally, the end of the LGIT was characterised by a maximal expansion of temperate and humid forest (birch, oak, pine, ashes, alder), as likely being the result of the climate improvement that characterises the present-day interglacial, the Holocene.

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Acknowledgments

This study has been financed by the Fundação para a Ciência e a Tecnologia (FCT) in the framework of the project “Envi-Changes”-Late Quaternary Environmental Changes From Estuary and Shelf Sedimentary Record (PLE/12/00), of the post-doc grant SFRH/BPD/36615/2007, and by two projects integrated in a French-Portuguese bilateral collaboration (PESSOA and ICCTI-IFREMER). We gratefully acknowledge César de Andrade for all the ­support and enlightening discussions along the Envi-Changes project. Thanks are also due to Marie-Hélène Castéra for palynological treatments.

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Authors and Affiliations

  1. Laboratorio Nacional de Energia e Geologia, Unidade de Geologia Marinha, Aptdo 7586, 2721-866, Amadora, Portugal

    Filipa Naughton

  2. INETI, Lisboa, Portugal

    Filipa Naughton

  3. Instituto Nacional de Recursos Biológicos I.P, IPIMAR, Av. 5 de Outubro, 8700-305, Olhão, Portugal

    Teresa Drago

  4. EPHE, Environnements et Paléoenvironnements Océaniques (UMR CNRS 5805 EPOC), Bordeaux 1 University, Av. des Facultés, 33405, Talence, France

    Maria Fernanda Sanchez-Goñi

  5. Departamento e Centro de Geologia, Faculdade de Ciências, Universidade de Lisboa, Bloco C6, 3º piso, Campo Grande, 1749-016, Lisboa, Portugal

    Maria Conceição Freitas

Authors
  1. Filipa Naughton
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  2. Teresa Drago
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  3. Maria Fernanda Sanchez-Goñi
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  4. Maria Conceição Freitas
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Corresponding author

Correspondence to Filipa Naughton .

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Editors and Affiliations

  1. Global Change, Energy, Environment and B, R & D Unit (CIAGEB), Universidade Fernando Pessoa, Praca 9 de Abril 349, Porto, 4949-004, Portugal

    Pedro Duarte

  2. Campus de Tafira, Department of Chemistry, University of Las Palmas de Gran Canaria, Las Palmas, 35017 Gran, Spain

    J. Magdalena Santana-Casiano

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Naughton, F., Drago, T., Sanchez-Goñi, M.F., Freitas, M.C. (2011). Climate Variability in the North-Western Iberian Peninsula During the Last Deglaciation. In: Duarte, P., Santana-Casiano, J. (eds) Oceans and the Atmospheric Carbon Content. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9821-4_1

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