Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record
The main objectives of this thesis were 1) to calibrate the first regional coastal upwelling transfer function for the western Iberian margin and 2) to investigate centennial- to millennial-scale hydrographic and productivity variations along this margin. To improve the knowledge on coastal upwellin...
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Universität Bremen
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2303 2023-05-15T17:14:56+02:00 Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record Carvalho Salgueiro, Maria Emilia Wefer, Gerold Abrantes, Fatima 2006-11-30 application/pdf https://media.suub.uni-bremen.de/handle/elib/2303 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000105386 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/2303 urn:nbn:de:gbv:46-diss000105386 info:eu-repo/semantics/openAccess Paleoceanography Planktonic foraminifera transfer functions sea surface temperature Export productivity upwelling Iberian margin 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2006 ftsubbremen 2022-11-09T07:09:46Z The main objectives of this thesis were 1) to calibrate the first regional coastal upwelling transfer function for the western Iberian margin and 2) to investigate centennial- to millennial-scale hydrographic and productivity variations along this margin. To improve the knowledge on coastal upwelling areas like the western Iberian margin is of crucial social and economic importance. Upwelling regions act as high accumulation areas allowing high-resolution reconstructions of past climatic changes, and as sinks for CO2 and thus possible climate regulators.The Present day record and the past oceanographic and productivity conditions on the Iberian margin were investigated through a multi-proxy study (planktonic and benthic foraminifera abundances and stable isotopes, planktonic foraminifera associations, detrital grain abundance (IRD), grain size analysis, carbonate content) of surface sediments and sediment cores.The distribution of the most abundant planktonic foraminifera species on surface sediment samples (134) collected along the Iberian margin clearly mirror the specific hydrographic conditions in this area. Globigerina bulloides and Neogloboquadrina pachyderma (dextral) reflect the seasonal (May to September) coastal upwelling north and south of Lisbonà �à ´s latitude, respectively, evidencing the two sources of upwelled water: subpolar Eastern North Atlantic Central Water (ENACW) in the north, and subtropical ENACW in the south. However, Neogloboquadrina pachyderma (dextral) in association with Globorotalia inflata also seems to mark the descending branch of the North Atlantic Drift (Portugal Current). The tropical-subtropical species Globigerinoides ruber (white), Globigerinoides trilobus trilobus, and Globorotalia inflata are related to the winter-time eastern branch of the Azores Current (Portugal Coastal Countercurrent). This data set and an eighteen year integration of daily satellite SST were used to calibrate and define a regional transfer function, which was then used to compare the results from ... Doctoral or Postdoctoral Thesis Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Paleoceanography Planktonic foraminifera transfer functions sea surface temperature Export productivity upwelling Iberian margin 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
Paleoceanography Planktonic foraminifera transfer functions sea surface temperature Export productivity upwelling Iberian margin 550 550 Earth sciences and geology ddc:550 Carvalho Salgueiro, Maria Emilia Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record |
topic_facet |
Paleoceanography Planktonic foraminifera transfer functions sea surface temperature Export productivity upwelling Iberian margin 550 550 Earth sciences and geology ddc:550 |
description |
The main objectives of this thesis were 1) to calibrate the first regional coastal upwelling transfer function for the western Iberian margin and 2) to investigate centennial- to millennial-scale hydrographic and productivity variations along this margin. To improve the knowledge on coastal upwelling areas like the western Iberian margin is of crucial social and economic importance. Upwelling regions act as high accumulation areas allowing high-resolution reconstructions of past climatic changes, and as sinks for CO2 and thus possible climate regulators.The Present day record and the past oceanographic and productivity conditions on the Iberian margin were investigated through a multi-proxy study (planktonic and benthic foraminifera abundances and stable isotopes, planktonic foraminifera associations, detrital grain abundance (IRD), grain size analysis, carbonate content) of surface sediments and sediment cores.The distribution of the most abundant planktonic foraminifera species on surface sediment samples (134) collected along the Iberian margin clearly mirror the specific hydrographic conditions in this area. Globigerina bulloides and Neogloboquadrina pachyderma (dextral) reflect the seasonal (May to September) coastal upwelling north and south of Lisbonà �à ´s latitude, respectively, evidencing the two sources of upwelled water: subpolar Eastern North Atlantic Central Water (ENACW) in the north, and subtropical ENACW in the south. However, Neogloboquadrina pachyderma (dextral) in association with Globorotalia inflata also seems to mark the descending branch of the North Atlantic Drift (Portugal Current). The tropical-subtropical species Globigerinoides ruber (white), Globigerinoides trilobus trilobus, and Globorotalia inflata are related to the winter-time eastern branch of the Azores Current (Portugal Coastal Countercurrent). This data set and an eighteen year integration of daily satellite SST were used to calibrate and define a regional transfer function, which was then used to compare the results from ... |
author2 |
Wefer, Gerold Abrantes, Fatima |
format |
Doctoral or Postdoctoral Thesis |
author |
Carvalho Salgueiro, Maria Emilia |
author_facet |
Carvalho Salgueiro, Maria Emilia |
author_sort |
Carvalho Salgueiro, Maria Emilia |
title |
Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record |
title_short |
Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record |
title_full |
Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record |
title_fullStr |
Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record |
title_full_unstemmed |
Oceanography and productivity conditions on the Iberian margin: a 150 ky foraminifera record |
title_sort |
oceanography and productivity conditions on the iberian margin: a 150 ky foraminifera record |
publisher |
Universität Bremen |
publishDate |
2006 |
url |
https://media.suub.uni-bremen.de/handle/elib/2303 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000105386 |
genre |
Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
genre_facet |
Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/2303 urn:nbn:de:gbv:46-diss000105386 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766073030370394112 |