Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP)
The Saalian was one of the largest glaciations during the Quaternary with an ice sheet extending considerably wider into the Eurasian continent than during other glacials. Orbital variations caused the ice sheet to switch between growing and shrinking. The partial retreat of the ice sheet and meltwa...
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Online Access: | https://oceanrep.geomar.de/id/eprint/54062/ https://oceanrep.geomar.de/id/eprint/54062/1/Wegwerth.pdf https://doi.org/10.1016/j.quascirev.2019.07.008 |
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ftoceanrep:oai:oceanrep.geomar.de:54062 2023-05-15T16:39:54+02:00 Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP) Wegwerth, Antje Dellwig, Olaf Wulf, Sabine Plessen, Birgit Kleinhanns, Ilka C. Nowaczyk, Norbert R. Jiabo, Liu Arz, Helge W. 2019-09 text https://oceanrep.geomar.de/id/eprint/54062/ https://oceanrep.geomar.de/id/eprint/54062/1/Wegwerth.pdf https://doi.org/10.1016/j.quascirev.2019.07.008 en eng Elsevier https://oceanrep.geomar.de/id/eprint/54062/1/Wegwerth.pdf Wegwerth, A., Dellwig, O., Wulf, S., Plessen, B., Kleinhanns, I. C., Nowaczyk, N. R., Jiabo, L. and Arz, H. W. (2019) Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP). Quaternary Science Reviews, 219 . pp. 126-144. DOI 10.1016/j.quascirev.2019.07.008 <https://doi.org/10.1016/j.quascirev.2019.07.008>. doi:10.1016/j.quascirev.2019.07.008 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1016/j.quascirev.2019.07.008 2023-04-07T15:58:53Z The Saalian was one of the largest glaciations during the Quaternary with an ice sheet extending considerably wider into the Eurasian continent than during other glacials. Orbital variations caused the ice sheet to switch between growing and shrinking. The partial retreat of the ice sheet and meltwater discharge resulted in global sea-level rise and increased lake levels of inland seas with broader environmental implications. During Marine Isotope Stage 6 (MIS 6), meltwater entered the formerly enclosed Black Sea at least twice as documented in a δ¹⁸O record from Anatolian speleothems. Here we present a sedimentary record from the Black Sea “Lake” covering MIS 6 and provide evidence for three meltwater periods coinciding with insolation maxima (BSWP-6-1: 180-167 ka BP, BSWP-6-2: 160-145 ka BP, BSWP-II: 133-130 ka BP). While δ¹⁸Oostracods and Sr/Caostracods point to pronounced meltwater supply and decreasing salinity, ⁸⁷Sr/⁸⁶Srostracods shed light on meltwater sources and pathways. During all three periods, meltwater drained most likely via the Dnieper and Volga into the Black and Caspian Seas and connected both basins. Relatively low ⁸⁷Sr/⁸⁶Srostracods values during the oldest meltwater period suggest melting solely of the eastern Eurasian Ice Sheet. In contrast, during the younger meltwater periods, exceptional high ⁸⁷Sr/⁸⁶Srostracods values point towards additional meltwater from the western Eurasian Ice Sheet. A surplus from melting glaciers in the Tian Shan and Pamir Mountains that finally entered the Caspian Sea via the Amu Darya and Sry Darya probably amplified the input of high radiogenic Sr-isotope water. We also show that higher temperatures and productivity suggest Dansgaard-Oeschger-like climate variability during the first half of MIS 6. Article in Journal/Newspaper Ice Sheet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Quaternary Science Reviews 219 126 144 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Saalian was one of the largest glaciations during the Quaternary with an ice sheet extending considerably wider into the Eurasian continent than during other glacials. Orbital variations caused the ice sheet to switch between growing and shrinking. The partial retreat of the ice sheet and meltwater discharge resulted in global sea-level rise and increased lake levels of inland seas with broader environmental implications. During Marine Isotope Stage 6 (MIS 6), meltwater entered the formerly enclosed Black Sea at least twice as documented in a δ¹⁸O record from Anatolian speleothems. Here we present a sedimentary record from the Black Sea “Lake” covering MIS 6 and provide evidence for three meltwater periods coinciding with insolation maxima (BSWP-6-1: 180-167 ka BP, BSWP-6-2: 160-145 ka BP, BSWP-II: 133-130 ka BP). While δ¹⁸Oostracods and Sr/Caostracods point to pronounced meltwater supply and decreasing salinity, ⁸⁷Sr/⁸⁶Srostracods shed light on meltwater sources and pathways. During all three periods, meltwater drained most likely via the Dnieper and Volga into the Black and Caspian Seas and connected both basins. Relatively low ⁸⁷Sr/⁸⁶Srostracods values during the oldest meltwater period suggest melting solely of the eastern Eurasian Ice Sheet. In contrast, during the younger meltwater periods, exceptional high ⁸⁷Sr/⁸⁶Srostracods values point towards additional meltwater from the western Eurasian Ice Sheet. A surplus from melting glaciers in the Tian Shan and Pamir Mountains that finally entered the Caspian Sea via the Amu Darya and Sry Darya probably amplified the input of high radiogenic Sr-isotope water. We also show that higher temperatures and productivity suggest Dansgaard-Oeschger-like climate variability during the first half of MIS 6. |
format |
Article in Journal/Newspaper |
author |
Wegwerth, Antje Dellwig, Olaf Wulf, Sabine Plessen, Birgit Kleinhanns, Ilka C. Nowaczyk, Norbert R. Jiabo, Liu Arz, Helge W. |
spellingShingle |
Wegwerth, Antje Dellwig, Olaf Wulf, Sabine Plessen, Birgit Kleinhanns, Ilka C. Nowaczyk, Norbert R. Jiabo, Liu Arz, Helge W. Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP) |
author_facet |
Wegwerth, Antje Dellwig, Olaf Wulf, Sabine Plessen, Birgit Kleinhanns, Ilka C. Nowaczyk, Norbert R. Jiabo, Liu Arz, Helge W. |
author_sort |
Wegwerth, Antje |
title |
Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP) |
title_short |
Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP) |
title_full |
Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP) |
title_fullStr |
Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP) |
title_full_unstemmed |
Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP) |
title_sort |
major hydrological shifts in the black sea “lake” in response to ice sheet collapses during mis 6 (130–184 ka bp) |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/54062/ https://oceanrep.geomar.de/id/eprint/54062/1/Wegwerth.pdf https://doi.org/10.1016/j.quascirev.2019.07.008 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://oceanrep.geomar.de/id/eprint/54062/1/Wegwerth.pdf Wegwerth, A., Dellwig, O., Wulf, S., Plessen, B., Kleinhanns, I. C., Nowaczyk, N. R., Jiabo, L. and Arz, H. W. (2019) Major hydrological shifts in the Black Sea “Lake” in response to ice sheet collapses during MIS 6 (130–184 ka BP). Quaternary Science Reviews, 219 . pp. 126-144. DOI 10.1016/j.quascirev.2019.07.008 <https://doi.org/10.1016/j.quascirev.2019.07.008>. doi:10.1016/j.quascirev.2019.07.008 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2019.07.008 |
container_title |
Quaternary Science Reviews |
container_volume |
219 |
container_start_page |
126 |
op_container_end_page |
144 |
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1766030257012342784 |