Abrantes, Fátima

Grimalt, J.

Martin, Pamela A.

Rodrigues, Teresa

Salgueiro, Emília

Voelker, Antje H. L.

Grimalt, Joan O.

Repositório do LNEG

2008 Fall Meeting          Search ResultsCite abstracts as Author(s) (2008), Title, Eos Trans. AGU,89(53), Fall Meet. Suppl., Abstract xxxxx-xxYour query was:salgueiroHR: 1340hAN: PP33C-1563TI: Upper Water Column Structure During Marine Isotope Stage 11.3 and the Holocene on thePortuguese MarginAU: * Salgueiro, EEM: esalgueiro@uchicago.eduAF: CIMAR - Centro de Investigação Marinha e Ambiental, Rua dos Bragas, 289, Porto, 4050-123,PortugalAU: * Salgueiro, EEM: esalgueiro@uchicago.eduAF: Dept. Geologia Marinha INETI, Estrada da Portela, Zambujal, Alfragide, 2721-866, PortugalAU: * Salgueiro, EEM: esalgueiro@uchicago.eduAF: Geophysical Sciences Department The University of Chicago, 5734 S. Ellis Avenue, Chicago, Il60637, United StatesAU: Martin, P AEM: pmartin@uchicago.eduAF: Geophysical Sciences Department The University of Chicago, 5734 S. Ellis Avenue, Chicago, Il60637, United StatesAU: Voelker, AEM: antje.voelker@ineti.ptAF: CIMAR - Centro de Investigação Marinha e Ambiental, Rua dos Bragas, 289, Porto, 4050-123,PortugalAU: Voelker, AEM: antje.voelker@ineti.ptAF: Dept. Geologia Marinha INETI, Estrada da Portela, Zambujal, Alfragide, 2721-866, PortugalAU: Rodrigues, TEM: teresa.rodrigues@ineti.ptAF: Department of Environmental Chemistry,Institute of Chemical and Environmental Research (CSIC),Jordi Girona, 18, Barcelona, 08034, SpainAU: Rodrigues, TEM: teresa.rodrigues@ineti.ptAF: Dept. Geologia Marinha INETI, Estrada da Portela, Zambujal, Alfragide, 2721-866, PortugalAU: Abrantes, FEM: fatima.abrantes@ineti.ptAF: Dept. Geologia Marinha INETI, Estrada da Portela, Zambujal, Alfragide, 2721-866, PortugalAU: Grimalt, JEM: jgoqam@iiqab.csic.esAF: Department of Environmental Chemistry,Institute of Chemical and Environmental Research (CSIC),Jordi Girona, 18, Barcelona, 08034, SpainAB: Most paleoceanographic studies have focused on reconstructing past surface water conditions byapplying global trace metal calibrations of surface dwelling planktonic foraminifera (PF) from tropical -subtropical  regions,  and  little  attention  has  been  paid  to  deep  dwelling  species  and  trace  metalcalibrations that  include coastal  upwelling samples.  We have generated regional  core-top PF traceelement ratio (Mg/Ca, Ba/Ca, Cd/Ca) and stable isotope (δ18O, δ13C) calibrations for the Portuguesemargin  upper  water  column  temperature  and  nutrient  content.  Three  species  with  different  depthhabitats  were  are  explored in  this  seasonal  upwelling  region:  G. bulloides  an  upper  water  columnspecies; G. ruber (white), a surface dwelling species; and G. inflata, a deep dwelling species. Mg/Caand δ18O values,  and the  derived sea surface temperature  (SST),  of  the  three PF species  mirrorseasonal temperatures in the water column as well  as different depth habitats: (1) G. ruber  (white)reflects  surface  conditions  (~10  m  water  depth)  in  the  warm  winter-time  Portugal  CoastalCountercurrent (PCCC); (2) G. inflata indicates the winter mixed layer but is also present in the PCCC;(3)  G. bulloides  records the summer upwelling species lives in  the upper  100 m water  depth,  butappears to migrate during the upwelling into waters closer to the surface (~10 m). The Ba/Ca, Cd/Caand δ13C imply  a  complex  relationship  between nutrient  tracers  and  the  nutrient  content  of  watermasses on the Portuguese margin. Taken at face value, each of the nutrient proxies and the threeforaminifera  species  seem to  record  different  nutrient  information.  G.  bulloides  data,  for  example,suggest higher nutrients related with the upwelling waters whereas G. inflata imply higher nutrients atthe base of the thermocline during winter. The insights gained from this study are being applied toreconstruct the upper water column structure on this seasonal upwelling margin during Marine IsotopeStage 11.3 and the Holocene, the most similar interglacial periods in terms of orbital parameters andgreenhouse gas concentrations,  with  the MD03-2699 core (recovered off  Lisbon:  39°  N;  10.7°  W).Additionally, these shell geochemistry data are compared with alkenone abundance and derived SSTdata.DE: 4924 Geochemical tracersDE: 4936 InterglacialDE: 4954 Sea surface temperatureDE: 4964 Upwelling (4279)SC: Paleoceanography and Paleoclimatology [PP]MN: 2008 Fall Meeting   New Search

Upper water column structure during marine isotope stage 11.3 and the Holocene on the portuguese margin

Laboratório Nacional de Energia e Geologia Repository

http://repositorio.lneg.pt/bitstream/10400.9/3014/1/34742.pdf

Upper water column structure during marine isotope stage 11.3 and the Holocene on the portuguese margin

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