Climate-driven connectivity changes of the Black Sea since 430 ka: Testing a dual palynological and geochemical approach

T.M. Hoyle; Diksha Bista; Rachel M Flecker; Wout Krijgsman; Francesca Sangiorgi

doi:10.1016/j.palaeo.2020.110069

Climate-driven connectivity changes of the Black Sea since 430 ka: Testing a dual palynological and geochemical approach

T.M. Hoyle, Diksha Bista, Rachel M Flecker, Wout Krijgsman, Francesca Sangiorgi

Research output: Contribution to journal › Article (Academic Journal) › peer-review

14 Citations (Scopus)

59 Downloads (Pure)

Abstract

The Black Sea experienced multiple episodes of connection with both the Mediterranean and Caspian seas during the Quaternary. Global sea-level variation has been proposed as the main driver of changes in Mediterranean- Black Sea connectivity, while positive water budgets drove Caspian overspill. We present a new, two proxy, low- resolution record from the Black Sea that allows reconstruction of connectivity history from 430 to 50 ka: di-noflagellate cysts (dinocysts) provide direct evidence for properties of surface waters and strontium isotopes constrain the source(s) of water entering the basin. Dinocysts and 87Sr/86Sr suggest that the Black Sea was isolated from the Mediterranean during global sea-level lowstands associated with glacials MIS 4, 8 and 10. Both proxies also strongly suggest that marine (Mediterranean) water flowed into the Black Sea during the eustatic highstands associated with peak interglacials during MIS 5 and 9. However, while the contribution of marine waters during MIS 5e was similar to the present day, lower 87Sr/86Sr during MIS 9 suggests lower than present input. Connectivity during MIS 11, MIS 7 and MIS 6 is more enigmatic. Lower 87Sr/86Sr than those of the isolated Black Sea and dinocyst assemblages dominated by species of Paratethyan lineage are compatible with input from the Caspian Sea. Dinocyst taxa recovered in MIS 11 can be found in both the Caspian Sea and the Black Sea today. All four interglacials studied contain different dinocyst assemblages, suggesting that different conditions may have prevailed during each warm period. However, high-resolution studies are needed to confirm this observation. Further work on the same sequence could be valuable in elucidating the connectivity history of the Black Sea over the glacial-interglacial cycles of the late Quaternary

Original language	English
Article number	110069
Number of pages	11
Journal	Palaeogeography, Palaeoclimatology, Palaeoecology
Volume	561
Early online date	2 Oct 2020
DOIs	https://doi.org/10.1016/j.palaeo.2020.110069
Publication status	Published - 1 Jan 2021

Bibliographical note

Funding Information:
This work was part of the PRIDE project, which received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 642973 . Thanks to Holger Kuhlman for facilitating access to the cores and to Sergei Lazarev for help sampling. The authors are grateful to the editor, Prof. Thomas Algeo, and three anonymous reviewers, whose comments contributed to the improvement of the manuscript.

Funding Information:
This work was part of the PRIDE project, which received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk?odowska-Curie grant agreement No 642973. Thanks to Holger Kuhlman for facilitating access to the cores and to Sergei Lazarev for help sampling. The authors are grateful to the editor, Prof. Thomas Algeo, and three anonymous reviewers, whose comments contributed to the improvement of the manuscript.

Publisher Copyright:
© 2020

Keywords

Dinoflagellate cysts
Strontium isotopes
Pontocaspian region
Late Quaternary
Connectivity

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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14 Citations
1 Article (Academic Journal)

Sr isotope-salinity modelling constraints on Quaternary Black Sea connectivity
Bista, D., Hoyle, T. M., Simon, D., Sangiorgi, F., Richards, D. A. & Flecker, R. M., 1 Dec 2021, In: Quaternary Science Reviews. 273, 18 p., 107254.
Research output: Contribution to journal › Article (Academic Journal) › peer-review

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4 Citations (Scopus)

63 Downloads (Pure)

PRIDE
Bista, D. (Researcher) & Flecker, R. M. (Principal Investigator)
Project: Research

Reconstructing the Pleistocene connectivity history of the Black Sea and the Caspian Sea using strontium isotopes
Bista, D. (Author), Flecker, R. (Supervisor) & Richards, D. (Supervisor), 1 Oct 2019
Student thesis: Doctoral Thesis › Doctor of Philosophy (PhD)

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Cite this

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title = "Climate-driven connectivity changes of the Black Sea since 430 ka: Testing a dual palynological and geochemical approach",

abstract = "The Black Sea experienced multiple episodes of connection with both the Mediterranean and Caspian seas during the Quaternary. Global sea-level variation has been proposed as the main driver of changes in Mediterranean- Black Sea connectivity, while positive water budgets drove Caspian overspill. We present a new, two proxy, low- resolution record from the Black Sea that allows reconstruction of connectivity history from 430 to 50 ka: di-noflagellate cysts (dinocysts) provide direct evidence for properties of surface waters and strontium isotopes constrain the source(s) of water entering the basin. Dinocysts and 87Sr/86Sr suggest that the Black Sea was isolated from the Mediterranean during global sea-level lowstands associated with glacials MIS 4, 8 and 10. Both proxies also strongly suggest that marine (Mediterranean) water flowed into the Black Sea during the eustatic highstands associated with peak interglacials during MIS 5 and 9. However, while the contribution of marine waters during MIS 5e was similar to the present day, lower 87Sr/86Sr during MIS 9 suggests lower than present input. Connectivity during MIS 11, MIS 7 and MIS 6 is more enigmatic. Lower 87Sr/86Sr than those of the isolated Black Sea and dinocyst assemblages dominated by species of Paratethyan lineage are compatible with input from the Caspian Sea. Dinocyst taxa recovered in MIS 11 can be found in both the Caspian Sea and the Black Sea today. All four interglacials studied contain different dinocyst assemblages, suggesting that different conditions may have prevailed during each warm period. However, high-resolution studies are needed to confirm this observation. Further work on the same sequence could be valuable in elucidating the connectivity history of the Black Sea over the glacial-interglacial cycles of the late Quaternary",

keywords = "Dinoflagellate cysts, Strontium isotopes, Pontocaspian region, Late Quaternary, Connectivity",

author = "T.M. Hoyle and Diksha Bista and Flecker, {Rachel M} and Wout Krijgsman and Francesca Sangiorgi",

note = "Funding Information: This work was part of the PRIDE project, which received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie grant agreement No 642973 . Thanks to Holger Kuhlman for facilitating access to the cores and to Sergei Lazarev for help sampling. The authors are grateful to the editor, Prof. Thomas Algeo, and three anonymous reviewers, whose comments contributed to the improvement of the manuscript. Funding Information: This work was part of the PRIDE project, which received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk?odowska-Curie grant agreement No 642973. Thanks to Holger Kuhlman for facilitating access to the cores and to Sergei Lazarev for help sampling. The authors are grateful to the editor, Prof. Thomas Algeo, and three anonymous reviewers, whose comments contributed to the improvement of the manuscript. Publisher Copyright: {\textcopyright} 2020",

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language = "English",

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T1 - Climate-driven connectivity changes of the Black Sea since 430 ka

T2 - Testing a dual palynological and geochemical approach

AU - Hoyle, T.M.

AU - Bista, Diksha

AU - Flecker, Rachel M

AU - Krijgsman, Wout

AU - Sangiorgi, Francesca

N1 - Funding Information: This work was part of the PRIDE project, which received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 642973 . Thanks to Holger Kuhlman for facilitating access to the cores and to Sergei Lazarev for help sampling. The authors are grateful to the editor, Prof. Thomas Algeo, and three anonymous reviewers, whose comments contributed to the improvement of the manuscript. Funding Information: This work was part of the PRIDE project, which received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk?odowska-Curie grant agreement No 642973. Thanks to Holger Kuhlman for facilitating access to the cores and to Sergei Lazarev for help sampling. The authors are grateful to the editor, Prof. Thomas Algeo, and three anonymous reviewers, whose comments contributed to the improvement of the manuscript. Publisher Copyright: © 2020

PY - 2021/1/1

Y1 - 2021/1/1

N2 - The Black Sea experienced multiple episodes of connection with both the Mediterranean and Caspian seas during the Quaternary. Global sea-level variation has been proposed as the main driver of changes in Mediterranean- Black Sea connectivity, while positive water budgets drove Caspian overspill. We present a new, two proxy, low- resolution record from the Black Sea that allows reconstruction of connectivity history from 430 to 50 ka: di-noflagellate cysts (dinocysts) provide direct evidence for properties of surface waters and strontium isotopes constrain the source(s) of water entering the basin. Dinocysts and 87Sr/86Sr suggest that the Black Sea was isolated from the Mediterranean during global sea-level lowstands associated with glacials MIS 4, 8 and 10. Both proxies also strongly suggest that marine (Mediterranean) water flowed into the Black Sea during the eustatic highstands associated with peak interglacials during MIS 5 and 9. However, while the contribution of marine waters during MIS 5e was similar to the present day, lower 87Sr/86Sr during MIS 9 suggests lower than present input. Connectivity during MIS 11, MIS 7 and MIS 6 is more enigmatic. Lower 87Sr/86Sr than those of the isolated Black Sea and dinocyst assemblages dominated by species of Paratethyan lineage are compatible with input from the Caspian Sea. Dinocyst taxa recovered in MIS 11 can be found in both the Caspian Sea and the Black Sea today. All four interglacials studied contain different dinocyst assemblages, suggesting that different conditions may have prevailed during each warm period. However, high-resolution studies are needed to confirm this observation. Further work on the same sequence could be valuable in elucidating the connectivity history of the Black Sea over the glacial-interglacial cycles of the late Quaternary

AB - The Black Sea experienced multiple episodes of connection with both the Mediterranean and Caspian seas during the Quaternary. Global sea-level variation has been proposed as the main driver of changes in Mediterranean- Black Sea connectivity, while positive water budgets drove Caspian overspill. We present a new, two proxy, low- resolution record from the Black Sea that allows reconstruction of connectivity history from 430 to 50 ka: di-noflagellate cysts (dinocysts) provide direct evidence for properties of surface waters and strontium isotopes constrain the source(s) of water entering the basin. Dinocysts and 87Sr/86Sr suggest that the Black Sea was isolated from the Mediterranean during global sea-level lowstands associated with glacials MIS 4, 8 and 10. Both proxies also strongly suggest that marine (Mediterranean) water flowed into the Black Sea during the eustatic highstands associated with peak interglacials during MIS 5 and 9. However, while the contribution of marine waters during MIS 5e was similar to the present day, lower 87Sr/86Sr during MIS 9 suggests lower than present input. Connectivity during MIS 11, MIS 7 and MIS 6 is more enigmatic. Lower 87Sr/86Sr than those of the isolated Black Sea and dinocyst assemblages dominated by species of Paratethyan lineage are compatible with input from the Caspian Sea. Dinocyst taxa recovered in MIS 11 can be found in both the Caspian Sea and the Black Sea today. All four interglacials studied contain different dinocyst assemblages, suggesting that different conditions may have prevailed during each warm period. However, high-resolution studies are needed to confirm this observation. Further work on the same sequence could be valuable in elucidating the connectivity history of the Black Sea over the glacial-interglacial cycles of the late Quaternary

KW - Dinoflagellate cysts

KW - Strontium isotopes

KW - Pontocaspian region

KW - Late Quaternary

KW - Connectivity

U2 - 10.1016/j.palaeo.2020.110069

DO - 10.1016/j.palaeo.2020.110069

M3 - Article (Academic Journal)

SN - 0031-0182

VL - 561

JO - Palaeogeography, Palaeoclimatology, Palaeoecology

JF - Palaeogeography, Palaeoclimatology, Palaeoecology

M1 - 110069

ER -

Climate-driven connectivity changes of the Black Sea since 430 ka: Testing a dual palynological and geochemical approach

Abstract

Bibliographical note

Keywords

UN SDGs

Access to Document

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Research output

Sr isotope-salinity modelling constraints on Quaternary Black Sea connectivity

Projects

PRIDE

Student theses

Reconstructing the Pleistocene connectivity history of the Black Sea and the Caspian Sea using strontium isotopes

Cite this