Evidence From Dissolved O2 Isotopes in North Atlantic Deep Water for a Recent Climatic Shift

Abstract Anthropogenic‐induced variations of the Atlantic Meridional Overturning Circulation (AMOC) and the associated Deep‐Water Formation (DWF) are a major concern. Using measurements of triple oxygen isotopes in the deep North Atlantic, we present novel evidence for a dramatic decadal to centenni...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Israela Musan, Hezi Gildor, Eugeni Barkan, William M. Smethie Jr., Boaz Luz
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
Geophysics. Cosmic physics
QC801-809
Nordic Seas
North Atlantic Deep Water
North Atlantic
Sea ice
Online Access:https://doi.org/10.1029/2022GL100489
https://doaj.org/article/fa38c792662a4373a416a3990f2872a5
Description
Summary:Abstract Anthropogenic‐induced variations of the Atlantic Meridional Overturning Circulation (AMOC) and the associated Deep‐Water Formation (DWF) are a major concern. Using measurements of triple oxygen isotopes in the deep North Atlantic, we present novel evidence for a dramatic decadal to centennial shift in ocean conditions at the source region of DWF. These measurements suggest a recent decrease in the percentage of photosynthetic O2 derived from the source regions of AMOC in the Nordic Seas compared to the Little Ice Age. 1‐D model simulations suggest that a reduction in photosynthetic O2 production can explain the observed decrease. Alternatively, it may indicate a substantial decrease in sea‐ice cover and thus increased air‐sea gas exchange, bringing the isotopic composition of O2 closer to equilibrium with the atmosphere. Our novel data can serve as a benchmark for climate models.

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