Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260
At the southern tip of Africa, the Agulhas Current reflects back into the Indian Ocean causing so-called "Agulhas rings" to spin off and release relatively warm and saline water into the South Atlantic Ocean. Previous reconstructions of the dynamics of the Agulhas Current, based on paleo-s...
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ftdatacite:10.1594/pangaea.877708 2023-05-15T18:00:48+02:00 Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260 Kasper, Sebastian van der Meer, Marcel T J Mets, Anchelique Zahn, Rainer Sinninghe Damsté, Jaap S Schouten, Stefan 2014 application/zip https://dx.doi.org/10.1594/pangaea.877708 https://doi.pangaea.de/10.1594/PANGAEA.877708 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.5194/cp-10-251-2014 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University NIOZ_UU Collection article Supplementary Collection of Datasets 2014 ftdatacite https://doi.org/10.1594/pangaea.877708 https://doi.org/10.5194/cp-10-251-2014 2021-11-05T12:55:41Z At the southern tip of Africa, the Agulhas Current reflects back into the Indian Ocean causing so-called "Agulhas rings" to spin off and release relatively warm and saline water into the South Atlantic Ocean. Previous reconstructions of the dynamics of the Agulhas Current, based on paleo-sea surface temperature and sea surface salinity proxies, inferred that Agulhas leakage from the Indian Ocean to the South Atlantic was reduced during glacial stages as a consequence of shifted wind fields and a northwards migration of the subtropical front. Subsequently, this might have led to a buildup of warm saline water in the southern Indian Ocean. To investigate this latter hypothesis, we reconstructed sea surface salinity changes using alkenone dD, and paleo-sea surface temperature using TEXH 86 and UK'37, from two sediment cores (MD02-2594, MD96-2080) located in the Agulhas leakage area during Termination I and II. Both UK'37 and TEXH 86 temperature reconstructions indicate an abrupt warming during the glacial terminations, while a shift to more negative dDalkenone values of approximately 14 per mil during glacial Termination I and II is also observed. Approximately half of the isotopic shift can be attributed to the change in global ice volume, while the residual isotopic shift is attributed to changes in salinity, suggesting relatively high salinities at the core sites during glacials, with subsequent freshening during glacial terminations. Approximate estimations suggest that dDalkenone represents a salinity change of ca. 1.7-1.9 during Termination I and Termination II. These estimations are in good agreement with the proposed changes in salinity derived from previously reported combined planktonic Foraminifera d18O values and Mg/Ca-based temperature reconstructions. Our results confirm that the dD of alkenones is a potentially suitable tool to reconstruct salinity changes independent of planktonic Foraminifera d18O. Article in Journal/Newspaper Planktonic foraminifera South Atlantic Ocean DataCite Metadata Store (German National Library of Science and Technology) Indian |
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English |
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NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University NIOZ_UU |
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NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University NIOZ_UU Kasper, Sebastian van der Meer, Marcel T J Mets, Anchelique Zahn, Rainer Sinninghe Damsté, Jaap S Schouten, Stefan Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260 |
topic_facet |
NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University NIOZ_UU |
description |
At the southern tip of Africa, the Agulhas Current reflects back into the Indian Ocean causing so-called "Agulhas rings" to spin off and release relatively warm and saline water into the South Atlantic Ocean. Previous reconstructions of the dynamics of the Agulhas Current, based on paleo-sea surface temperature and sea surface salinity proxies, inferred that Agulhas leakage from the Indian Ocean to the South Atlantic was reduced during glacial stages as a consequence of shifted wind fields and a northwards migration of the subtropical front. Subsequently, this might have led to a buildup of warm saline water in the southern Indian Ocean. To investigate this latter hypothesis, we reconstructed sea surface salinity changes using alkenone dD, and paleo-sea surface temperature using TEXH 86 and UK'37, from two sediment cores (MD02-2594, MD96-2080) located in the Agulhas leakage area during Termination I and II. Both UK'37 and TEXH 86 temperature reconstructions indicate an abrupt warming during the glacial terminations, while a shift to more negative dDalkenone values of approximately 14 per mil during glacial Termination I and II is also observed. Approximately half of the isotopic shift can be attributed to the change in global ice volume, while the residual isotopic shift is attributed to changes in salinity, suggesting relatively high salinities at the core sites during glacials, with subsequent freshening during glacial terminations. Approximate estimations suggest that dDalkenone represents a salinity change of ca. 1.7-1.9 during Termination I and Termination II. These estimations are in good agreement with the proposed changes in salinity derived from previously reported combined planktonic Foraminifera d18O values and Mg/Ca-based temperature reconstructions. Our results confirm that the dD of alkenones is a potentially suitable tool to reconstruct salinity changes independent of planktonic Foraminifera d18O. |
format |
Article in Journal/Newspaper |
author |
Kasper, Sebastian van der Meer, Marcel T J Mets, Anchelique Zahn, Rainer Sinninghe Damsté, Jaap S Schouten, Stefan |
author_facet |
Kasper, Sebastian van der Meer, Marcel T J Mets, Anchelique Zahn, Rainer Sinninghe Damsté, Jaap S Schouten, Stefan |
author_sort |
Kasper, Sebastian |
title |
Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260 |
title_short |
Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260 |
title_full |
Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260 |
title_fullStr |
Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260 |
title_full_unstemmed |
Stable hydrogen and carbon isotopes of C37 alkenones during Termination I and II, supplement to: Kasper, Sebastian; van der Meer, Marcel T J; Mets, Anchelique; Zahn, Rainer; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C37 alkenones during Termination I and II. Climate of the Past, 10(1), 251-260 |
title_sort |
stable hydrogen and carbon isotopes of c37 alkenones during termination i and ii, supplement to: kasper, sebastian; van der meer, marcel t j; mets, anchelique; zahn, rainer; sinninghe damsté, jaap s; schouten, stefan (2014): salinity changes in the agulhas leakage area recorded by stable hydrogen isotopes of c37 alkenones during termination i and ii. climate of the past, 10(1), 251-260 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2014 |
url |
https://dx.doi.org/10.1594/pangaea.877708 https://doi.pangaea.de/10.1594/PANGAEA.877708 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera South Atlantic Ocean |
genre_facet |
Planktonic foraminifera South Atlantic Ocean |
op_relation |
https://dx.doi.org/10.5194/cp-10-251-2014 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.877708 https://doi.org/10.5194/cp-10-251-2014 |
_version_ |
1766170053108039680 |