Stable isotopes and Mg/Ca 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. Here, we present a high-resolu...
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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.945715 https://doi.org/10.1594/PANGAEA.945715 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.945715 |
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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 AGE Bottom water temperature standard deviation Calculated from Mg/Ca ratios and d18O and corrected for ice volume Calculated from Mg/Ca ratios and d18O corrected DEPTH sediment/rock GC Gravity corer Inductively coupled plasma-optical emission spectrometry (Iris Intrepid II ICP-OES) Islandiella helenae Magnesium/Calcium ratio δ18O Labrador Sea Maria S. Merian Mass spectrometer Thermo Finnigan MAT 253 Mg/Ca-based paleotemperatures MSM45 MSM45_418-2 MSM45-19-2 stable oxygen isotopes ice volume free seawater reconstructed |
spellingShingle |
8.2 ka event AGE Bottom water temperature standard deviation Calculated from Mg/Ca ratios and d18O and corrected for ice volume Calculated from Mg/Ca ratios and d18O corrected DEPTH sediment/rock GC Gravity corer Inductively coupled plasma-optical emission spectrometry (Iris Intrepid II ICP-OES) Islandiella helenae Magnesium/Calcium ratio δ18O Labrador Sea Maria S. Merian Mass spectrometer Thermo Finnigan MAT 253 Mg/Ca-based paleotemperatures MSM45 MSM45_418-2 MSM45-19-2 stable oxygen isotopes ice volume free seawater reconstructed Lochte, Annalena Antonia Schneider, Ralph R Stable isotopes and Mg/Ca of sediment core MSM45/19-2 |
topic_facet |
8.2 ka event AGE Bottom water temperature standard deviation Calculated from Mg/Ca ratios and d18O and corrected for ice volume Calculated from Mg/Ca ratios and d18O corrected DEPTH sediment/rock GC Gravity corer Inductively coupled plasma-optical emission spectrometry (Iris Intrepid II ICP-OES) Islandiella helenae Magnesium/Calcium ratio δ18O Labrador Sea Maria S. Merian Mass spectrometer Thermo Finnigan MAT 253 Mg/Ca-based paleotemperatures MSM45 MSM45_418-2 MSM45-19-2 stable oxygen isotopes ice volume free seawater reconstructed |
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. Here, we present a high-resolution and well-dated sediment record from the northern Labrador Shelf that provides new evidence of the freshwater signature and the mechanisms involved in the Hudson Bay Ice Saddle collapse. A combination of Mg/Ca ratios and stable oxygen isotopes of benthic foraminifera indicate temperature changes and freshening of Labrador Shelf bottom waters. About 60 specimens of I. helenae were handpicked from the 200–315 μm fraction in 5-cm intervals downcore, weighed, and crushed between two glass plates. The crushed samples were then split for Mg/Ca and stable isotope measurements (see below). About two thirds of each crushed sample was transferred into pre-leached Eppendorf vials and cleaned following the full protocol of Martin and Lea (2002), including a reductive and oxidative cleaning step and a final leaching step with 0.001 N HNO3. After dissolving and diluting the samples in 0.1 N HNO3, they were measured with an inductively coupled plasma-optical emission spectrometry (ICP-OES) instrument with radial plasma observation at the Institute of Geosciences, Kiel University. The analytical error of Mg/Ca analyses was 0.1% relative standard deviation and accuracy was monitored with reference material JCP-1. Additional trace elements (Fe, Al, and Mn) were monitored to exclude possible contaminated or coated samples from the dataset. Based on 15 duplicate down-core sample measurements, we obtained a standard deviation of 0.07 mmol/mol Mg/Ca, which translates into 0.9 °C with respect to temperature estimates. For bottom water temperature reconstructions, we applied the calibration of Skirbekk et al. (2016). As the calibration is based on a temperature range of 1–4 °C, it may become less accurate when temperatures exceed 4 °C, ... |
format |
Dataset |
author |
Lochte, Annalena Antonia Schneider, Ralph R |
author_facet |
Lochte, Annalena Antonia Schneider, Ralph R |
author_sort |
Lochte, Annalena Antonia |
title |
Stable isotopes and Mg/Ca of sediment core MSM45/19-2 |
title_short |
Stable isotopes and Mg/Ca of sediment core MSM45/19-2 |
title_full |
Stable isotopes and Mg/Ca of sediment core MSM45/19-2 |
title_fullStr |
Stable isotopes and Mg/Ca of sediment core MSM45/19-2 |
title_full_unstemmed |
Stable isotopes and Mg/Ca of sediment core MSM45/19-2 |
title_sort |
stable isotopes and mg/ca of sediment core msm45/19-2 |
publisher |
PANGAEA |
publishDate |
2022 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.945715 https://doi.org/10.1594/PANGAEA.945715 |
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: 0.08 m * MAXIMUM DEPTH, sediment/rock: 11.33 m |
long_lat |
ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-61.937500,-61.937500,58.761330,58.761330) |
geographic |
Hudson Bay Canada Hudson Labrador Shelf |
geographic_facet |
Hudson Bay Canada Hudson Labrador Shelf |
genre |
Arctic Hudson Bay Labrador Sea Northwest Atlantic |
genre_facet |
Arctic Hudson Bay Labrador Sea Northwest Atlantic |
op_relation |
Lochte, Annalena Antonia; Repschläger, Janne; Kienast, Markus; Garbe-Schönberg, Dieter; Andersen, Nils; Hamann, Christian; Schneider, Ralph R (2019): Labrador Sea freshening at 8.5 ka BP caused by Hudson Bay Ice Saddle collapse. Nature Communications, 10(1), https://doi.org/10.1038/s41467-019-08408-6 Austermann, Jacqueline; Mitrovica, Jerry X; Latychev, Konstantin; Milne, Glenn A (2013): Barbados-based estimate of ice volume at Last Glacial Maximum affected by subducted plate. Nature Geoscience, 6(7), 553-557, https://doi.org/10.1038/ngeo1859 Martin, Pamela A; Lea, David W (2002): A simple evaluation of cleaning procedures on fossil benthic foraminiferal Mg/Ca. Geochemistry, Geophysics, Geosystems, 3(10), 1-8, https://doi.org/10.1029/2001GC000280 Skirbekk, Kari; Hald, Morten; Marchitto, Thomas M; Junttila, Juho; Sørensen, Steffen Aagaard (2016): Benthic foraminiferal growth seasons implied from Mg/Ca-temperature correlations for three Arctic species. Geochemistry, Geophysics, Geosystems, 17(11), 4684-4704 https://doi.pangaea.de/10.1594/PANGAEA.945715 https://doi.org/10.1594/PANGAEA.945715 |
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.94571510.1038/s41467-019-08408-610.1038/ngeo185910.1029/2001GC000280 |
_version_ |
1802639101063593984 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.945715 2024-06-23T07:48:47+00:00 Stable isotopes and Mg/Ca 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: 0.08 m * MAXIMUM DEPTH, sediment/rock: 11.33 m 2022 text/tab-separated-values, 1100 data points https://doi.pangaea.de/10.1594/PANGAEA.945715 https://doi.org/10.1594/PANGAEA.945715 en eng PANGAEA Lochte, Annalena Antonia; Repschläger, Janne; Kienast, Markus; Garbe-Schönberg, Dieter; Andersen, Nils; Hamann, Christian; Schneider, Ralph R (2019): Labrador Sea freshening at 8.5 ka BP caused by Hudson Bay Ice Saddle collapse. Nature Communications, 10(1), https://doi.org/10.1038/s41467-019-08408-6 Austermann, Jacqueline; Mitrovica, Jerry X; Latychev, Konstantin; Milne, Glenn A (2013): Barbados-based estimate of ice volume at Last Glacial Maximum affected by subducted plate. Nature Geoscience, 6(7), 553-557, https://doi.org/10.1038/ngeo1859 Martin, Pamela A; Lea, David W (2002): A simple evaluation of cleaning procedures on fossil benthic foraminiferal Mg/Ca. Geochemistry, Geophysics, Geosystems, 3(10), 1-8, https://doi.org/10.1029/2001GC000280 Skirbekk, Kari; Hald, Morten; Marchitto, Thomas M; Junttila, Juho; Sørensen, Steffen Aagaard (2016): Benthic foraminiferal growth seasons implied from Mg/Ca-temperature correlations for three Arctic species. Geochemistry, Geophysics, Geosystems, 17(11), 4684-4704 https://doi.pangaea.de/10.1594/PANGAEA.945715 https://doi.org/10.1594/PANGAEA.945715 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess 8.2 ka event AGE Bottom water temperature standard deviation Calculated from Mg/Ca ratios and d18O and corrected for ice volume Calculated from Mg/Ca ratios and d18O corrected DEPTH sediment/rock GC Gravity corer Inductively coupled plasma-optical emission spectrometry (Iris Intrepid II ICP-OES) Islandiella helenae Magnesium/Calcium ratio δ18O Labrador Sea Maria S. Merian Mass spectrometer Thermo Finnigan MAT 253 Mg/Ca-based paleotemperatures MSM45 MSM45_418-2 MSM45-19-2 stable oxygen isotopes ice volume free seawater reconstructed Dataset 2022 ftpangaea https://doi.org/10.1594/PANGAEA.94571510.1038/s41467-019-08408-610.1038/ngeo185910.1029/2001GC000280 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. Here, we present a high-resolution and well-dated sediment record from the northern Labrador Shelf that provides new evidence of the freshwater signature and the mechanisms involved in the Hudson Bay Ice Saddle collapse. A combination of Mg/Ca ratios and stable oxygen isotopes of benthic foraminifera indicate temperature changes and freshening of Labrador Shelf bottom waters. About 60 specimens of I. helenae were handpicked from the 200–315 μm fraction in 5-cm intervals downcore, weighed, and crushed between two glass plates. The crushed samples were then split for Mg/Ca and stable isotope measurements (see below). About two thirds of each crushed sample was transferred into pre-leached Eppendorf vials and cleaned following the full protocol of Martin and Lea (2002), including a reductive and oxidative cleaning step and a final leaching step with 0.001 N HNO3. After dissolving and diluting the samples in 0.1 N HNO3, they were measured with an inductively coupled plasma-optical emission spectrometry (ICP-OES) instrument with radial plasma observation at the Institute of Geosciences, Kiel University. The analytical error of Mg/Ca analyses was 0.1% relative standard deviation and accuracy was monitored with reference material JCP-1. Additional trace elements (Fe, Al, and Mn) were monitored to exclude possible contaminated or coated samples from the dataset. Based on 15 duplicate down-core sample measurements, we obtained a standard deviation of 0.07 mmol/mol Mg/Ca, which translates into 0.9 °C with respect to temperature estimates. For bottom water temperature reconstructions, we applied the calibration of Skirbekk et al. (2016). As the calibration is based on a temperature range of 1–4 °C, it may become less accurate when temperatures exceed 4 °C, ... Dataset Arctic Hudson Bay Labrador Sea Northwest Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Hudson Bay Canada Hudson Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-61.937500,-61.937500,58.761330,58.761330) |