Rapid coastal deoxygenation due to ocean circulation shift in the northwest Atlantic

Claret, Mariona; Galbraith, Eric D.; Palter, Jaime B.; Bianchi, Daniele; Fennel, Katja; Gilbert, Denis; Dunne, John P.

doi:10.1038/s41558-018-0263-1

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Rapid coastal deoxygenation due to ocean circulation shift in the northwest Atlantic

2018
By Claret, Mariona ; Galbraith, Eric D. ; Palter, Jaime B. ; ...
Source: Nature Climate Change, 8(10), 868-+.

[PDF-3.19 MB]

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Journal Title:

Nature Climate Change
Personal Author:

Claret, Mariona ; Galbraith, Eric D. ; Palter, Jaime B. ; Bianchi, Daniele ; Fennel, Katja ; ... More +

Claret, Mariona ; Galbraith, Eric D. ; Palter, Jaime B. ; Bianchi, Daniele ; Fennel, Katja ; Gilbert, Denis ; Dunne, John P. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) ; GFDL (Geophysical Fluid Dynamics Laboratory)

OAR (Oceanic and Atmospheric Research) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
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Global observations show that the ocean lost approximately 2% of its oxygen inventory over the past five decades(1-3), with important implications for marine ecosystems(4,5). The rate of change varies regionally, with northwest Atlantic coastal waters showing a long-term drop(6,7) that vastly outpaces the global and North Atlantic basin mean deoxygenation rates(5,8). However, past work has been unable to differentiate the role of large-scale climate forcing from that of local processes. Here, we use hydrographic evidence to show that a Labrador Current retreat is playing a key role in the deoxygenation on the northwest Atlantic shelf. A high-resolution global coupled climate-biogeochemistry model(9) reproduces the observed decline of saturation oxygen concentrations in the region, driven by a retreat of the equatorward-flowing Labrador Current and an associated shift towards more oxygen-poor subtropical waters on the shelf. The dynamical changes underlying the shift in shelf water properties are correlated with a slowdown in the simulated Atlantic Meridional Overturning Circulation (AMOC)(10). Our results provide strong evidence that a major, centennial-scale change of the Labrador Current is underway, and highlight the potential for ocean dynamics to impact coastal deoxygenation over the coming century.
Source:

Nature Climate Change, 8(10), 868-+.
DOI:

https://doi.org/10.1038/s41558-018-0263-1
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Journal Article
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Grant no. NA15NOS4780186
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urn:sha256:c9bf0d14ec66c37753641a136591b0746ed7989743db2d66171d4d6e95cacabb
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https://repository.library.noaa.gov/view/noaa/20889/noaa_20889_DS1.pdf
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Rapid coastal deoxygenation due to ocean circulation shift in the northwest Atlantic

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