Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements
Abstract 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 infl...
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ftdoajarticles:oai:doaj.org/article:ae89fac3ee9341c796fd116cfceabe65 2024-09-15T17:48:14+00:00 Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements Cynthia D. Nevison David R. Munro Nicole S. Lovenduski Ralph F. Keeling Manfredi Manizza Eric J. Morgan Christian Rödenbeck 2020-02-01T00:00:00Z https://doi.org/10.1029/2019GL085667 https://doaj.org/article/ae89fac3ee9341c796fd116cfceabe65 EN eng Wiley https://doi.org/10.1029/2019GL085667 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2019GL085667 https://doaj.org/article/ae89fac3ee9341c796fd116cfceabe65 Geophysical Research Letters, Vol 47, Iss 4, Pp n/a-n/a (2020) atmospheric potential oxygen carbon dioxide air‐sea flux Antarctic oscillation Southern Annular Mode seasonal cycles Geophysics. Cosmic physics QC801-809 article 2020 ftdoajarticles https://doi.org/10.1029/2019GL085667 2024-08-05T17:48:42Z Abstract 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. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 47 4 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
atmospheric potential oxygen carbon dioxide air‐sea flux Antarctic oscillation Southern Annular Mode seasonal cycles Geophysics. Cosmic physics QC801-809 |
spellingShingle |
atmospheric potential oxygen carbon dioxide air‐sea flux Antarctic oscillation Southern Annular Mode seasonal cycles Geophysics. Cosmic physics QC801-809 Cynthia D. Nevison David R. Munro Nicole S. Lovenduski Ralph F. Keeling Manfredi Manizza Eric J. Morgan Christian Rödenbeck Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements |
topic_facet |
atmospheric potential oxygen carbon dioxide air‐sea flux Antarctic oscillation Southern Annular Mode seasonal cycles Geophysics. Cosmic physics QC801-809 |
description |
Abstract 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. |
format |
Article in Journal/Newspaper |
author |
Cynthia D. Nevison David R. Munro Nicole S. Lovenduski Ralph F. Keeling Manfredi Manizza Eric J. Morgan Christian Rödenbeck |
author_facet |
Cynthia D. Nevison David R. Munro Nicole S. Lovenduski Ralph F. Keeling Manfredi Manizza Eric J. Morgan Christian Rödenbeck |
author_sort |
Cynthia D. Nevison |
title |
Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements |
title_short |
Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements |
title_full |
Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements |
title_fullStr |
Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements |
title_full_unstemmed |
Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O2 and CO2 Measurements |
title_sort |
southern annular mode influence on wintertime ventilation of the southern ocean detected in atmospheric o2 and co2 measurements |
publisher |
Wiley |
publishDate |
2020 |
url |
https://doi.org/10.1029/2019GL085667 https://doaj.org/article/ae89fac3ee9341c796fd116cfceabe65 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Geophysical Research Letters, Vol 47, Iss 4, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2019GL085667 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2019GL085667 https://doaj.org/article/ae89fac3ee9341c796fd116cfceabe65 |
op_doi |
https://doi.org/10.1029/2019GL085667 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
4 |
_version_ |
1810289391490301952 |