Impact of Arctic shelf summer stratification on Holocene climate variability

Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at: http://doi.org/10.1016/j.quascirev.2018.05.017 Understanding the dynamic of freshwater and sea-ice export from the Arctic is crucial to better comprehend the potential near-future climate change consequences. Here...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: Thibodeau, Benoit, Bauch, Henning A., Knies, Jochen
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2018
Subjects:
VDP::Mathematics and natural science: 400::Geosciences: 450
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450
Arctic
Arctic Ocean
Laptev Sea
Climate change
laptev
Sea ice
Online Access:https://hdl.handle.net/10037/14753
https://doi.org/10.1016/j.quascirev.2018.05.017
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Summary:Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at: http://doi.org/10.1016/j.quascirev.2018.05.017 Understanding the dynamic of freshwater and sea-ice export from the Arctic is crucial to better comprehend the potential near-future climate change consequences. Here, we report nitrogen isotope data of a core from the Laptev Sea to shed light on the impact of the Holocene Siberian transgression on the summer stratification of the Laptev Sea. Our data suggest that the oceanographic setting was less favourable to sea-ice formation in the Laptev Sea during the early to mid-Holocene. It is only after the sea level reached a standstill at around 4 ka that the water column structure in the Laptev Sea became more stable. Modern-day conditions, often described as “sea-ice factory”, were reached about 2 ka ago, after the development of a strong summer stratification. These results are consistent with sea-ice reconstruction along the Transpolar Drift, highlighting the potential contribution of the Laptev Sea to the export of freshwater from the Arctic Ocean.

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