BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Influence of dominant wind patterns in a distal region of the NW Iberian Margin during the last glaciation

Participants in the publication
Maria Virgínia Alves Martins (Author)
Daniel Rey (Author)
Egberto Pereira (Author)
Maider Plaza-Morlote (Author)
Emília Salgueiro (Author)
João Moreno (Author)
IDL
Wânia Duleba (Author)
Sara Ribeiro (Author)
José Francisco dos Santos (Author)
Ulisses Dardon (Author)
Ana Bernabeu (Author)
Belén Rubio (Author)
Lazaro Luiz Mattos Laut (Author)
Fabrizio Frontalini (Author)
Maria Antonieta da Conceição Rodrigues (Author)
Fernando Rocha (Author)

Summary
This work combines planktonic foraminiferal assemblages, stable isotope, transfer function estimated sea surface\\\\npaleotemperatures (SST) and export productivity (Pexp) with sedimentological records from the PC7 core to document\\\\npaleoclimatic and paleoceanographic changes on a distal region of the NW Iberian Margin since the last glaciation (<≈68 ka).\\\\nNeodymium and strontium isotope data are also used to identify the provenance of ice rafted debris (IRD) during Heinrich event\\\\n5 (H5). Our results are compared and combined with previously published records and evidence that melt water and icebergs\\\\nfrom the Canada, Greenland, Iceland and Europe ice sheets arrived to the NW Iberian Margin causing a significant decrease of\\\\nSST during the last six Heinrich Stadials (HS) and some Dansgaard–Oeschger (D-O) stadial events. εNd and 87Sr/86Sr indicate\\\\nthat the studied locality mostly received sediments from European Ice Sheets (EIS) during H5. During the HS and D–O stadial\\\\nevents, SSTs were in general higher than in other cores collected in inner areas of the NW Iberian Margin. The presence and\\\\nintensification of Portugal Current probably induced heat transfer to this distal region of the Iberian Margin. Our results also\\\\nsuggest the occurrence of high variability in the intensity and wind patterns during the last glaciation. In some periods, the\\\\nintensity of northerly winds could have been very strong and contributed to a significant stimulation of ocean productivity in\\\\nthis distal area through the intensification of upwelling. In general, oceanic productivity decreased during the HS and D–O as\\\\nthe presence of cold and less saline water prevented nutrient rich waters from deep levels reaching the surface. The high\\\\nproductivity events were bracketed by periods characterized by the highest influence of the Azores Current eastern branch\\\\nduring which northerly winds and the oceanic productivity should have been weakened.


Where published
Journal of the Geological Society

Publication Identifiers
ISSN - 0016-7649,2041-479X

Publisher
Geological Society of London



Document Identifiers
DOI - https://doi.org/10.1144/jgs2017-075
URL - http://dx.doi.org/10.1144/jgs2017-075