TY - JOUR
T1 - Evidence From Dissolved O2 Isotopes in North Atlantic Deep Water for a Recent Climatic Shift
AU - Musan, Israela
AU - Gildor, Hezi
AU - Barkan, Eugeni
AU - Smethie, William M.
AU - Luz, Boaz
N1 - Publisher Copyright:
© 2023. The Authors.
PY - 2023/2/16
Y1 - 2023/2/16
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.
UR - http://www.scopus.com/inward/record.url?scp=85147963712&partnerID=8YFLogxK
U2 - 10.1029/2022GL100489
DO - 10.1029/2022GL100489
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AN - SCOPUS:85147963712
SN - 0094-8276
VL - 50
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 3
M1 - e2022GL100489
ER -