Coccolithosphores and fossil organic compounds of sediment core MD01-2444
This study analyzes coccolithophore abundance fluctuations (e.g., Emiliania huxleyi, Gephyrocapsa specimens, and Florisphaera profunda) in core MD01-2444 sediment strata retrieved at the Iberian Margin, northeastern Atlantic Ocean. Coccolithophores are calcareous nannofossils, a major component of t...
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.831559 https://doi.org/10.1594/PANGAEA.831559 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.831559 2023-05-15T15:12:17+02:00 Coccolithosphores and fossil organic compounds of sediment core MD01-2444 Incarbona, Alessandro Martrat, Belén Di Stefano, Enrico Grimalt, Joan O Pelosi, Nicola Patti, Bernardo Tranchida, Giorgio LATITUDE: 37.565000 * LONGITUDE: -10.134000 2010-04-08 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.831559 https://doi.org/10.1594/PANGAEA.831559 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.831559 https://doi.org/10.1594/PANGAEA.831559 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Incarbona, Alessandro; Martrat, Belén; Di Stefano, Enrico; Grimalt, Joan O; Pelosi, Nicola; Patti, Bernardo; Tranchida, Giorgio (2010): Primary productivity variability on the Atlantic Iberian Margin over the last 70,000 years: Evidence from coccolithophores and fossil organic compounds. Paleoceanography, 25(2), PA2218, https://doi.org/10.1029/2008PA001709 CALYPSO Calypso Corer GEOSCIENCES MARMARCORE Marion Dufresne (1995) MD01-2444 MD123 Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.831559 https://doi.org/10.1029/2008PA001709 2023-01-20T07:33:16Z This study analyzes coccolithophore abundance fluctuations (e.g., Emiliania huxleyi, Gephyrocapsa specimens, and Florisphaera profunda) in core MD01-2444 sediment strata retrieved at the Iberian Margin, northeastern Atlantic Ocean. Coccolithophores are calcareous nannofossils, a major component of the oceanic phytoplankton, which provide information about past ecological and climatological variability. Results are supported by data on fossil organic compounds (sea surface temperatures, alkenones, and n-hexacosan-1-ol index) and geochemical analyses (benthic d13Ccc and planktonic d18Occ isotopes). Three scenarios are taken into account for this location at centennial-scale resolution over the last 70,000 years: the Holocene and the stadial and interstadial modes. The different alternatives are described by means of elements such as nutrients; upwelling phenomena; temperatures at surface and subsurface level; or the arrival of surface turbid, fresh, and cold waters due to icebergs, low sea level, increased aridity, and dust. During the Holocene, moderate primary productivity was observed (mainly concentrated in E. huxleyi specimens); surface temperatures were at maxima while the water column was highly ventilated by northern-sourced polar deep waters and warmer subsurface, nutrient-poor subtropical waters. Over most of the last glacial stadials, surface productivity weakened (higher F. profunda and reworked specimen percentages and lower diunsaturated and triunsaturated C37 alkenones); the arrival of cold Arctic surface waters traced by tetraunsaturated C37 peaks and large E. huxleyi, together with powerful ventilated southern-sourced polar deep waters, disturbed, in all likelihood, the delicate vertical equilibrium while preventing significant upwelling mixing. Finally, during the last glacial interstadials (lower F. profunda percentages, nonreworked material, and higher diunsaturated and triunsaturated C37 alkenones) a combined signal is observed: warm surface temperatures were concurrent with generally low ... Dataset Arctic Iceberg* Phytoplankton PANGAEA - Data Publisher for Earth & Environmental Science Arctic ENVELOPE(-10.134000,-10.134000,37.565000,37.565000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
CALYPSO Calypso Corer GEOSCIENCES MARMARCORE Marion Dufresne (1995) MD01-2444 MD123 |
spellingShingle |
CALYPSO Calypso Corer GEOSCIENCES MARMARCORE Marion Dufresne (1995) MD01-2444 MD123 Incarbona, Alessandro Martrat, Belén Di Stefano, Enrico Grimalt, Joan O Pelosi, Nicola Patti, Bernardo Tranchida, Giorgio Coccolithosphores and fossil organic compounds of sediment core MD01-2444 |
topic_facet |
CALYPSO Calypso Corer GEOSCIENCES MARMARCORE Marion Dufresne (1995) MD01-2444 MD123 |
description |
This study analyzes coccolithophore abundance fluctuations (e.g., Emiliania huxleyi, Gephyrocapsa specimens, and Florisphaera profunda) in core MD01-2444 sediment strata retrieved at the Iberian Margin, northeastern Atlantic Ocean. Coccolithophores are calcareous nannofossils, a major component of the oceanic phytoplankton, which provide information about past ecological and climatological variability. Results are supported by data on fossil organic compounds (sea surface temperatures, alkenones, and n-hexacosan-1-ol index) and geochemical analyses (benthic d13Ccc and planktonic d18Occ isotopes). Three scenarios are taken into account for this location at centennial-scale resolution over the last 70,000 years: the Holocene and the stadial and interstadial modes. The different alternatives are described by means of elements such as nutrients; upwelling phenomena; temperatures at surface and subsurface level; or the arrival of surface turbid, fresh, and cold waters due to icebergs, low sea level, increased aridity, and dust. During the Holocene, moderate primary productivity was observed (mainly concentrated in E. huxleyi specimens); surface temperatures were at maxima while the water column was highly ventilated by northern-sourced polar deep waters and warmer subsurface, nutrient-poor subtropical waters. Over most of the last glacial stadials, surface productivity weakened (higher F. profunda and reworked specimen percentages and lower diunsaturated and triunsaturated C37 alkenones); the arrival of cold Arctic surface waters traced by tetraunsaturated C37 peaks and large E. huxleyi, together with powerful ventilated southern-sourced polar deep waters, disturbed, in all likelihood, the delicate vertical equilibrium while preventing significant upwelling mixing. Finally, during the last glacial interstadials (lower F. profunda percentages, nonreworked material, and higher diunsaturated and triunsaturated C37 alkenones) a combined signal is observed: warm surface temperatures were concurrent with generally low ... |
format |
Dataset |
author |
Incarbona, Alessandro Martrat, Belén Di Stefano, Enrico Grimalt, Joan O Pelosi, Nicola Patti, Bernardo Tranchida, Giorgio |
author_facet |
Incarbona, Alessandro Martrat, Belén Di Stefano, Enrico Grimalt, Joan O Pelosi, Nicola Patti, Bernardo Tranchida, Giorgio |
author_sort |
Incarbona, Alessandro |
title |
Coccolithosphores and fossil organic compounds of sediment core MD01-2444 |
title_short |
Coccolithosphores and fossil organic compounds of sediment core MD01-2444 |
title_full |
Coccolithosphores and fossil organic compounds of sediment core MD01-2444 |
title_fullStr |
Coccolithosphores and fossil organic compounds of sediment core MD01-2444 |
title_full_unstemmed |
Coccolithosphores and fossil organic compounds of sediment core MD01-2444 |
title_sort |
coccolithosphores and fossil organic compounds of sediment core md01-2444 |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.831559 https://doi.org/10.1594/PANGAEA.831559 |
op_coverage |
LATITUDE: 37.565000 * LONGITUDE: -10.134000 |
long_lat |
ENVELOPE(-10.134000,-10.134000,37.565000,37.565000) |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Iceberg* Phytoplankton |
genre_facet |
Arctic Iceberg* Phytoplankton |
op_source |
Supplement to: Incarbona, Alessandro; Martrat, Belén; Di Stefano, Enrico; Grimalt, Joan O; Pelosi, Nicola; Patti, Bernardo; Tranchida, Giorgio (2010): Primary productivity variability on the Atlantic Iberian Margin over the last 70,000 years: Evidence from coccolithophores and fossil organic compounds. Paleoceanography, 25(2), PA2218, https://doi.org/10.1029/2008PA001709 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.831559 https://doi.org/10.1594/PANGAEA.831559 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.831559 https://doi.org/10.1029/2008PA001709 |
_version_ |
1766342988499255296 |