Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 13, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL097574
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Funding
- National Science Foundation (NSF) [OCE-1756956]
- David and Lucille Packard Foundation
- Resnick Sustainability Institute
- NSF Graduate Research Fellowship
- NSF [OCE-1756882]
- National Oceanic and Atmospheric Administration [NA20OAR4320271]
- NSF's Southern Ocean Carbon and Climate Observations and Modeling Project [PLR-1425989, OPP-1936222]
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Flow-topography interactions along the path of the Antarctic Circumpolar Current have a significant impact on ventilation.
Flow-topography interactions along the path of the Antarctic Circumpolar Current generate standing meanders, create regions of enhanced eddy kinetic energy (EKE), and modify frontal structure. We consider the impact of standing meanders on ventilation based on oxygen measurements from Argo floats and the patterns of apparent oxygen utilization (AOU). Regions of high-EKE have relatively reduced AOU values at depths 200-700 m below the base of the mixed layer and larger AOU variance, suggesting enhanced ventilation due to both along-isopycnal stirring and enhanced exchange across the base of the mixed layer. Vertical exchange is inferred from finite-size Lyapunov exponents, a proxy for the magnitude of surface lateral density gradients, which suggest that submesoscale vertical velocities may contribute to ventilation. The shaping of ventilation by standing meanders has implications for the temporal and spatial variability of air-sea exchange.
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