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  Active North Atlantic deepwater formation during Heinrich Stadial 1

Repschläger, J., Zhao, N., Rand, D., Lisiecki, L., Muglia, J., Mulitza, S., et al. (2021). Active North Atlantic deepwater formation during Heinrich Stadial 1. Quaternary Science Reviews, 270: 107145. doi:10.1016/j.quascirev.2021.107145.

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Genre: Journal Article

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 Creators:
Repschläger, Janne1, Author              
Zhao, Ning1, Author              
Rand, Devin2, Author
Lisiecki, Lorraine2, Author
Muglia, Juan2, Author
Mulitza, Stefan2, Author
Schmittner, Andreas2, Author
Cartapanis, Olivier2, Author
Bauch, Henning A.2, Author
Schiebel, Ralf1, Author              
Haug, Gerald H.1, Author              
Affiliations:
1Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              
2external, ou_persistent22              

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 Abstract: Deepwater circulation significantly changed during the last deglaciation from a shallow to a deep-reaching overturning cell. This change went along with a drawdown of isotopically light waters into the abyss and a deep ocean warming that changed deep ocean stratification from a salinity-to a temperature-controlled mode. Yet, the exact mechanisms causing these changes are still unknown. Furthermore, the long-standing idea of a complete shutdown of North Atlantic deepwater formation during Heinrich Stadial 1 (HS1) (17.5–14.6 kyr BP) remains prevalent. Here, we present a new compilation of benthic δ13C and δ18O data from the North Atlantic at high temporal resolution with consistent age models, established as part of the international PAGES working group OC3, to investigate deepwater properties in the North Atlantic. The extensive compilation, which includes 105 sediment cores, reveals different water masses during HS1. A water mass with heavy δ13C and δ18O signature occupies the Iceland Basin, whereas between 20 and 50°N, a distinct tongue of 18O depleted, 13C enriched water reaches down to 4000 m water depths. The heavy δ13C signature indicates active deepwater formation in the North Atlantic during HS1. Differences in its δ18O signature indicate either different sources or an alteration of the deepwater on its southward pathway. Based on these results, we discuss concepts of deepwater formation in the North Atlantic that help to explain the deglacial change from a salinity-driven to a temperature-driven circulation mode.

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Language(s): eng - English
 Dates: 2021-09-07
 Publication Status: Published online
 Pages: 19
 Publishing info: -
 Table of Contents: -
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Title: Quaternary Science Reviews
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 270 Sequence Number: 107145 Start / End Page: - Identifier: ISSN: 0277-3791
CoNE: https://pure.mpg.de/cone/journals/resource/954925505268