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DOI | 10.1029/2019GL085667 |
Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O-2 and CO2 Measurements | |
Nevison, Cynthia D.1; Munro, David R.2,3; Lovenduski, Nicole S.1,4; Keeling, Ralph F.5; Manizza, Manfredi5; Morgan, Eric J.5; Roedenbeck, Christian6 | |
2020-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Germany |
英文摘要 | 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 O-2/N-2 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 O-2 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. Plain Language Summary The Southern Annular Mode (SAM) is characterized by variability in the strength of the westerly winds that encircle Antarctica. A more positive SAM index is associated with stronger westerly winds over the ocean at about 60 degrees S latitude. Previous studies based mostly on model simulations have suggested that a positive SAM index is also associated with enhanced upwelling of carbon-rich waters in the Southern Ocean, which influences the uptake and/or release of carbon dioxide to the atmosphere. The same deep waters that have high carbon also have low concentrations of dissolved oxygen, which can cause subtle variations in atmospheric oxygen levels measured at surface stations. We present an analysis of data sets from three Southern Hemisphere stations where air samples have been collected for 25-30 years. We find that during the Southern Hemisphere winter, anomalies in the atmospheric oxygen record are correlated to the SAM index; we find weaker correlations between anomalies in atmospheric carbon dioxide and the SAM index. These results are consistent with variability in air-sea oxygen fluxes from a model simulation. The model results indicate that the observed relationship between SAM and air-sea oxygen fluxes is due to both stronger wind speeds and increased upwelling of oxygen-depleted deep waters. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529120100044 |
WOS关键词 | CARBON-DIOXIDE ; OXYGEN ; VARIABILITY ; CIRCULATION ; SINKS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279719 |
专题 | 气候变化 |
作者单位 | 1.Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA; 2.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; 3.NOAA, Global Monitoring Div, Earth Syst Res Lab, Boulder, CO USA; 4.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA; 5.Univ Calif La Jolla, Scripps Inst Oceanog, La Jolla, CA USA; 6.Max Planck Inst, Jena, Germany |
推荐引用方式 GB/T 7714 | Nevison, Cynthia D.,Munro, David R.,Lovenduski, Nicole S.,et al. Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O-2 and CO2 Measurements[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(4). |
APA | Nevison, Cynthia D..,Munro, David R..,Lovenduski, Nicole S..,Keeling, Ralph F..,Manizza, Manfredi.,...&Roedenbeck, Christian.(2020).Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O-2 and CO2 Measurements.GEOPHYSICAL RESEARCH LETTERS,47(4). |
MLA | Nevison, Cynthia D.,et al."Southern Annular Mode Influence on Wintertime Ventilation of the Southern Ocean Detected in Atmospheric O-2 and CO2 Measurements".GEOPHYSICAL RESEARCH LETTERS 47.4(2020). |
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