Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O-2 and CO2 Measurements

Nevison, Cynthia D.; Munro, David R.; Lovenduski, Nicole S.; Keeling, Ralph F.; Manizza, Manfredi; Morgan, Eric J.; Rödenbeck, Christian

doi:10.1029/2019GL085667

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Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O-2 and CO2 Measurements

2020
By Nevison, Cynthia D. ; Munro, David R. ; Lovenduski, Nicole S. ; ...
Source: Geophysical Research Letters, 47, e2019GL085667

[PDF-4.69 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Nevison, Cynthia D. ; Munro, David R. ; Lovenduski, Nicole S. ; Keeling, Ralph F. ; Manizza, Manfredi ; ... More +

Nevison, Cynthia D. ; Munro, David R. ; Lovenduski, Nicole S. ; Keeling, Ralph F. ; Manizza, Manfredi ; Morgan, Eric J. ; Rödenbeck, Christian Less -
NOAA Program & Office:

CIRES (Cooperative Institute for Research in Environmental Sciences) ; OAR (Oceanic and Atmospheric Research) ; GML (Global Monitoring Laboratory)

CIRES (Cooperative Institute for Research in Environmental Sciences) ; OAR (Oceanic and Atmospheric Research) ; GML (Global Monitoring Laboratory) Less -
Description:

The Southern Annular Mode (SAM) is the dominant mode of climate variability in the Southern Ocean, but only a few observational studies have linked variability in SAM to changes in ocean circulation. Atmospheric potential oxygen (APO) combines atmospheric O2/N2 and CO2 data to mask the influence of terrestrial exchanges, yielding a tracer that is sensitive mainly to ocean circulation and biogeochemistry. We show that observed wintertime anomalies of APO are significantly correlated to SAM in 25- to 30-year time series at three Southern Hemisphere sites, while CO2 anomalies are also weakly correlated. We find additional correlations between SAM and O2 air-sea fluxes in austral winter inferred from both an atmospheric inversion of observed APO and a forced ocean biogeochemistry model simulation. The model results indicate that the correlation with SAM is mechanistically linked to stronger wind speeds and upwelling, which brings oxygen-depleted deep waters to the surface.
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Air-sea Flux Antarctic Oscillation Atmospheric Potential Oxygen Carbon Dioxide Seasonal Cycles Southern Annular Mode
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Geophysical Research Letters, 47, e2019GL085667
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https://doi.org/10.1029/2019GL085667
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urn:sha256:8b4f9b3504adc21286b8aa4ca90df46fbe538fc0cab3a9f0203c333bf2d04cae
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Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O-2 and CO2 Measurements

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