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Quantitative estimates of younger dryas freshening from lipid [delta]2H analysis in the Beaufort Sea

The leading hypothesis attributes the Younger Dryas (YD) event to a disruption in the Atlantic Meridional Overturning Circulation, driven by meltwater input from North America. Determining the origin, timing, and magnitude of YD freshening are crucial for understanding abrupt climate change. This st...

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Hauptverfasser: Wu, Junjie (VerfasserIn) , Stein, Ruediger (VerfasserIn) , Sachs, Julian P. (VerfasserIn) , Wolhowe, Matthew (VerfasserIn) , Fahl, Kirsten (VerfasserIn) , You, Defang (VerfasserIn)
Dokumenttyp: Article (Journal) Editorial
Sprache:Englisch
Veröffentlicht: 28 February 2025
In: Geophysical research letters
Year: 2025, Jahrgang: 52, Heft: 4, Pages: 1-12
ISSN:1944-8007
DOI:10.1029/2024GL112485
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1029/2024GL112485
Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1029/2024GL112485
Volltext
Verfasserangaben:Junjie Wu, Ruediger Stein, Julian P. Sachs, Matthew Wolhowe, Kirsten Fahl, and Defang You
Beschreibung
Zusammenfassung:The leading hypothesis attributes the Younger Dryas (YD) event to a disruption in the Atlantic Meridional Overturning Circulation, driven by meltwater input from North America. Determining the origin, timing, and magnitude of YD freshening are crucial for understanding abrupt climate change. This study examines the δ2H values of specific lipids in response to freshwater discharge and provides a quantitative estimate of YD freshening, using a marine sediment core from the Canadian Beaufort Sea, a region with documented evidence of a YD flood event. A pronounced reduction in δ2H values of leaf wax lipids and microalgal dinosterol indicates marked freshening at the onset of the YD, with the YD flood and the melting Laurentide Ice Sheet likely reducing surface water salinity by ∼15-24. In contrast, salinity levels remained high and stable for the last 8 kyr, likely implying a drier climate in the Mackenzie River basin.
Beschreibung:Online veröffentlicht: 12. Februar 2025
Gesehen am 31.07.2025
Im Titel ist "delta" als griechischer Buchstabe dargestellt
Im Titel ist die Zahl "2" hochgestellt
Beschreibung:Online Resource
ISSN:1944-8007
DOI:10.1029/2024GL112485

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