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

Israela Musan; Hezi Gildor; Eugeni Barkan; William M. Smethie; Boaz Luz

doi:10.1029/2022GL100489

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

Israela Musan, Hezi Gildor^*, Eugeni Barkan, William M. Smethie, Boaz Luz

^*Corresponding author for this work

Fredy & Nadine Herrmann Institute of Earth Sciences

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	e2022GL100489
Journal	Geophysical Research Letters
Volume	50
Issue number	3
DOIs	https://doi.org/10.1029/2022GL100489
State	Published - 16 Feb 2023

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© 2023. The Authors.

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10.1029/2022GL100489

Cite this

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title = "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 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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AU - Musan, Israela

AU - Gildor, Hezi

AU - Barkan, Eugeni

AU - Smethie, William M.

AU - Luz, Boaz

PY - 2023/2/16

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N2 - 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.

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

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