BG Biogeosciences BG Biogeosciences 1726-4189 Copernicus Publications Göttingen, Germany 10.5194/bg-8-2295-2011 Assessment of sea surface temperature changes in the Gulf of Cadiz during the last 30 ka: implications for glacial changes in the regional hydrography Penaud A. 1 2 Eynaud F. 2 Voelker A. 3 Kageyama M. 4 Marret F. 5 Turon J. L. 2 Blamart D. 4 Mulder T. 2 Rossignol L. 2 UMR6538 Domaines Océaniques, IUEM-UBO, 29280 Plouzané, France UMR5805 EPOC, Université de Bordeaux 1, 33405 Talence, France LNEG, Unidade de Geologia Marinha, Estrada da Portela, Zambujal, 2610-143 Amadora, Portugal Laboratoire des Sciences du Climat et l'Environnement (LSCE), Orme des Merisiers, Centre de Saclay, 91191 Gif sur Yvette Cedex, France School of Environmental Sciences, University of Liverpool, Liverpool, L69 7ZT, UK 23 08 2011 8 8 2295 2316 Copyright: © 2011 A. Penaud et al. 2011 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://bg.copernicus.org/articles/8/2295/2011/bg-8-2295-2011.html The full text article is available as a PDF file from https://bg.copernicus.org/articles/8/2295/2011/bg-8-2295-2011.pdf

New dinocyst analyses were conducted on core MD99-2339 retrieved from the central Gulf of Cadiz. Dinocyst and foraminiferal assemblages from this core are combined with existing data off SW Portugal and NW Morocco to investigate past hydrological and primary productivity regimes in the subtropical NE Atlantic Ocean over the last 30 ka. Our results have revealed highest upwelling intensity during Heinrich Stadial 1 (HS 1) and the Younger Dryas and weaker upwelling cells during the Last Glacial Maximum (LGM) and HS 2, off the SW Iberian and NW Moroccan margins. Similar assemblages between the Gulf of Cadiz and the NW Moroccan margin, and distinct species off Portugal, were observed during the cold climatic extremes that punctuated the last 30 ka. This pattern has been linked to the occurrence of a hydrological structure between SW Iberia and Cadiz during the last glacial period, perhaps similar to the modern Azores Front. This front was probably responsible locally for heterotrophic dinocysts found in the Gulf of Cadiz during the last glacial period, even if this sector is not conductive to upwelling phenomena by Ekman transport. Regional reconstructions of paleo-sea-surface temperatures (SSTs) using dinocyst and foraminiferal transfer functions, as well as alkenones, are also discussed and depict coherent scenarios over the last 30 ka. Seasonal reconstructions of LGM SSTs obtained with this multi-proxy panel are discussed jointly with model outputs in order to contribute to ongoing efforts in model-data comparison.

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