Alkenone analyses of sediment core MSM45/19_2
The presented data originates from the 1306cm long gravity core MSM45-19-2 (58°45.68 N, 61°56.25 W, 202m water depth) taken during R/V Maria S. Merian cruise MSM45 in August 2015 at 202 m water depth on the northern Labrador Shelf, northeast Canada, northwest Atlantic. In order to fully understand t...
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Language: | English |
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PANGAEA
2022
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.945742 https://doi.org/10.1594/PANGAEA.945742 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.945742 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
8.2 ka event Alkenone C37:4 sum DEPTH sediment/rock GC Gravity corer Holocene Labrador Sea Maria S. Merian MSM45 MSM45_418-2 MSM45-19-2 SST |
spellingShingle |
8.2 ka event Alkenone C37:4 sum DEPTH sediment/rock GC Gravity corer Holocene Labrador Sea Maria S. Merian MSM45 MSM45_418-2 MSM45-19-2 SST Lochte, Annalena Antonia Schneider, Ralph R Alkenone analyses of sediment core MSM45/19_2 |
topic_facet |
8.2 ka event Alkenone C37:4 sum DEPTH sediment/rock GC Gravity corer Holocene Labrador Sea Maria S. Merian MSM45 MSM45_418-2 MSM45-19-2 SST |
description |
The presented data originates from the 1306cm long gravity core MSM45-19-2 (58°45.68 N, 61°56.25 W, 202m water depth) taken during R/V Maria S. Merian cruise MSM45 in August 2015 at 202 m water depth on the northern Labrador Shelf, northeast Canada, northwest Atlantic. In order to fully understand the dynamics that contributed to the establishment of modern Labrador Sea circulation, detailed reconstructions of the major paleoceanographic changes through the Holocene are critical. Therefore, this study aims to provide new information on bottom (i.e. subsurface) water mass composition as well as on changes in primary productivity and sea-ice conditions in the LC during the Holocene. Reconstructions are based on alkenone biomarker concentrations to provide a better understanding of the dynamics of different water masses that contributed to the establishment of modern Labrador Sea. circulation. Long-chain alkenones are biosynthesized by haptophytes (e.g. the coccolithophorid Emiliania huxleyi) living in surface waters. They consist of 37 carbon atoms with 2, 3, or 4 double bonds (C37:2, C37:3, and C37:4, respectively). Alkenone analyses were carried out at the Biomarker Laboratory at Kiel University. In total, 290 samples were analyzed in 5-cm intervals. Long-chained alkenones (C37) were extracted from 2 to 3 g of homogenized bulk sediment, using an Accelerated Solvent Extractor (Dionex ASE-200) with a mixture of 9:1 (v/v) of dichloromethane: methanol (DCM: MeOH) at 100°C and 100 bar N2 (g) pressure for 20 min. Extracts were cooled at −20°C and brought to near dryness by Syncore polyvap at 40°C and 490 mbar. For the identification and quantification of C37:2, C37:3, and C37:4 compounds, we used a multi-dimensional, double gas column chromatography (MD-GC) set up with two Agilent 6890 gas chromatographs (Etourneau et al., 2010). The addition of an internal standard prior to extraction (cholestane (C27H48) and hexatriacontane (C36H74)) allowed quantification of the three different compounds in nanograms per gram dry ... |
format |
Dataset |
author |
Lochte, Annalena Antonia Schneider, Ralph R |
author_facet |
Lochte, Annalena Antonia Schneider, Ralph R |
author_sort |
Lochte, Annalena Antonia |
title |
Alkenone analyses of sediment core MSM45/19_2 |
title_short |
Alkenone analyses of sediment core MSM45/19_2 |
title_full |
Alkenone analyses of sediment core MSM45/19_2 |
title_fullStr |
Alkenone analyses of sediment core MSM45/19_2 |
title_full_unstemmed |
Alkenone analyses of sediment core MSM45/19_2 |
title_sort |
alkenone analyses of sediment core msm45/19_2 |
publisher |
PANGAEA |
publishDate |
2022 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.945742 https://doi.org/10.1594/PANGAEA.945742 |
op_coverage |
LATITUDE: 58.761330 * LONGITUDE: -61.937500 * DATE/TIME START: 2015-08-10T18:20:00 * DATE/TIME END: 2015-08-10T18:20:00 * MINIMUM DEPTH, sediment/rock: 0.03 m * MAXIMUM DEPTH, sediment/rock: 13.03 m |
long_lat |
ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-61.937500,-61.937500,58.761330,58.761330) |
geographic |
Canada Labrador Shelf |
geographic_facet |
Canada Labrador Shelf |
genre |
Labrador Sea Northwest Atlantic Sea ice |
genre_facet |
Labrador Sea Northwest Atlantic Sea ice |
op_relation |
Lochte, Annalena Antonia; Repschläger, Janne; Seidenkrantz, Marit-Solveig; Kienast, Markus; Blanz, Thomas; Schneider, Ralph R (2019): Holocene water mass changes in the Labrador Current. The Holocene, 29(4), 676-690, https://doi.org/10.1177/0959683618824752 Blanz, Thomas; Emeis, Kay-Christian; Siegel, Herbert (2005): Controls on alkenone unsaturation ratios along the salinity gradient between the open ocean and the Baltic Sea. Geochimica et Cosmochimica Acta, 69(14), 3589-3600, https://doi.org/10.1016/j.gca.2005.02.026 Etourneau, Johan; Schneider, Ralph R; Blanz, Thomas; Martinez, Philippe (2010): Intensification of the Walker and Hadley atmospheric circulations during the Pliocene-Pleistocene climate transition. Earth and Planetary Science Letters, 297(1-2), 103-110, https://doi.org/10.1016/j.epsl.2010.06.010 https://doi.pangaea.de/10.1594/PANGAEA.945742 https://doi.org/10.1594/PANGAEA.945742 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.94574210.1177/095968361882475210.1016/j.gca.2005.02.02610.1016/j.epsl.2010.06.010 |
_version_ |
1802646586781597696 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.945742 2024-06-23T07:54:26+00:00 Alkenone analyses of sediment core MSM45/19_2 Lochte, Annalena Antonia Schneider, Ralph R LATITUDE: 58.761330 * LONGITUDE: -61.937500 * DATE/TIME START: 2015-08-10T18:20:00 * DATE/TIME END: 2015-08-10T18:20:00 * MINIMUM DEPTH, sediment/rock: 0.03 m * MAXIMUM DEPTH, sediment/rock: 13.03 m 2022 text/tab-separated-values, 398 data points https://doi.pangaea.de/10.1594/PANGAEA.945742 https://doi.org/10.1594/PANGAEA.945742 en eng PANGAEA Lochte, Annalena Antonia; Repschläger, Janne; Seidenkrantz, Marit-Solveig; Kienast, Markus; Blanz, Thomas; Schneider, Ralph R (2019): Holocene water mass changes in the Labrador Current. The Holocene, 29(4), 676-690, https://doi.org/10.1177/0959683618824752 Blanz, Thomas; Emeis, Kay-Christian; Siegel, Herbert (2005): Controls on alkenone unsaturation ratios along the salinity gradient between the open ocean and the Baltic Sea. Geochimica et Cosmochimica Acta, 69(14), 3589-3600, https://doi.org/10.1016/j.gca.2005.02.026 Etourneau, Johan; Schneider, Ralph R; Blanz, Thomas; Martinez, Philippe (2010): Intensification of the Walker and Hadley atmospheric circulations during the Pliocene-Pleistocene climate transition. Earth and Planetary Science Letters, 297(1-2), 103-110, https://doi.org/10.1016/j.epsl.2010.06.010 https://doi.pangaea.de/10.1594/PANGAEA.945742 https://doi.org/10.1594/PANGAEA.945742 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess 8.2 ka event Alkenone C37:4 sum DEPTH sediment/rock GC Gravity corer Holocene Labrador Sea Maria S. Merian MSM45 MSM45_418-2 MSM45-19-2 SST Dataset 2022 ftpangaea https://doi.org/10.1594/PANGAEA.94574210.1177/095968361882475210.1016/j.gca.2005.02.02610.1016/j.epsl.2010.06.010 2024-06-12T14:17:12Z The presented data originates from the 1306cm long gravity core MSM45-19-2 (58°45.68 N, 61°56.25 W, 202m water depth) taken during R/V Maria S. Merian cruise MSM45 in August 2015 at 202 m water depth on the northern Labrador Shelf, northeast Canada, northwest Atlantic. In order to fully understand the dynamics that contributed to the establishment of modern Labrador Sea circulation, detailed reconstructions of the major paleoceanographic changes through the Holocene are critical. Therefore, this study aims to provide new information on bottom (i.e. subsurface) water mass composition as well as on changes in primary productivity and sea-ice conditions in the LC during the Holocene. Reconstructions are based on alkenone biomarker concentrations to provide a better understanding of the dynamics of different water masses that contributed to the establishment of modern Labrador Sea. circulation. Long-chain alkenones are biosynthesized by haptophytes (e.g. the coccolithophorid Emiliania huxleyi) living in surface waters. They consist of 37 carbon atoms with 2, 3, or 4 double bonds (C37:2, C37:3, and C37:4, respectively). Alkenone analyses were carried out at the Biomarker Laboratory at Kiel University. In total, 290 samples were analyzed in 5-cm intervals. Long-chained alkenones (C37) were extracted from 2 to 3 g of homogenized bulk sediment, using an Accelerated Solvent Extractor (Dionex ASE-200) with a mixture of 9:1 (v/v) of dichloromethane: methanol (DCM: MeOH) at 100°C and 100 bar N2 (g) pressure for 20 min. Extracts were cooled at −20°C and brought to near dryness by Syncore polyvap at 40°C and 490 mbar. For the identification and quantification of C37:2, C37:3, and C37:4 compounds, we used a multi-dimensional, double gas column chromatography (MD-GC) set up with two Agilent 6890 gas chromatographs (Etourneau et al., 2010). The addition of an internal standard prior to extraction (cholestane (C27H48) and hexatriacontane (C36H74)) allowed quantification of the three different compounds in nanograms per gram dry ... Dataset Labrador Sea Northwest Atlantic Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Canada Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-61.937500,-61.937500,58.761330,58.761330) |