Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean
Carbon export driven by submesoscale, eddy-associated vertical velocities (“eddy subduction”) remains understudied, leaving a gap in our understanding of ocean carbon sequestration. Here, we assess mechanisms controlling eddy subduction’s spatial and seasonal patterns using 15 years of observations...
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2024
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Online Access: | http://dx.doi.org/10.22541/essoar.171500945.54247568/v1 |
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crwinnower:10.22541/essoar.171500945.54247568/v1 2024-06-02T07:58:32+00:00 Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean Chen, Michael Lee Schofield, Oscar 2024 http://dx.doi.org/10.22541/essoar.171500945.54247568/v1 unknown Authorea, Inc. posted-content 2024 crwinnower https://doi.org/10.22541/essoar.171500945.54247568/v1 2024-05-07T14:19:16Z Carbon export driven by submesoscale, eddy-associated vertical velocities (“eddy subduction”) remains understudied, leaving a gap in our understanding of ocean carbon sequestration. Here, we assess mechanisms controlling eddy subduction’s spatial and seasonal patterns using 15 years of observations from BGC-Argo floats in the Southern Ocean. We identify signatures of eddy subduction as subsurface anomalies in temperature-salinity and oxygen. The anomalies’ spatial distribution is concentrated near weakly stratified areas and strong lateral buoyancy gradients diagnosed from satellite altimetry, particularly in the Antarctic Circumpolar Current’s standing meander regions. Meanwhile, vertical stratification drives seasonal variability. Bio-optical proxies associated with subsurface anomalies (such as the Chlorophyll a to particulate backscatter ratio: Chl/bbp), indicate that eddy subduction is most active in the spring and early summer, with freshly exported material associated with seasonally weak vertical stratification. Climate change is increasing ocean stratification globally, which may weaken eddy subduction’s carbon export potential. Other/Unknown Material Antarc* Antarctic Southern Ocean The Winnower Antarctic Southern Ocean The Antarctic |
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The Winnower |
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description |
Carbon export driven by submesoscale, eddy-associated vertical velocities (“eddy subduction”) remains understudied, leaving a gap in our understanding of ocean carbon sequestration. Here, we assess mechanisms controlling eddy subduction’s spatial and seasonal patterns using 15 years of observations from BGC-Argo floats in the Southern Ocean. We identify signatures of eddy subduction as subsurface anomalies in temperature-salinity and oxygen. The anomalies’ spatial distribution is concentrated near weakly stratified areas and strong lateral buoyancy gradients diagnosed from satellite altimetry, particularly in the Antarctic Circumpolar Current’s standing meander regions. Meanwhile, vertical stratification drives seasonal variability. Bio-optical proxies associated with subsurface anomalies (such as the Chlorophyll a to particulate backscatter ratio: Chl/bbp), indicate that eddy subduction is most active in the spring and early summer, with freshly exported material associated with seasonally weak vertical stratification. Climate change is increasing ocean stratification globally, which may weaken eddy subduction’s carbon export potential. |
format |
Other/Unknown Material |
author |
Chen, Michael Lee Schofield, Oscar |
spellingShingle |
Chen, Michael Lee Schofield, Oscar Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean |
author_facet |
Chen, Michael Lee Schofield, Oscar |
author_sort |
Chen, Michael Lee |
title |
Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean |
title_short |
Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean |
title_full |
Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean |
title_fullStr |
Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean |
title_full_unstemmed |
Spatial and Seasonal Controls on Eddy Subduction in the Southern Ocean |
title_sort |
spatial and seasonal controls on eddy subduction in the southern ocean |
publisher |
Authorea, Inc. |
publishDate |
2024 |
url |
http://dx.doi.org/10.22541/essoar.171500945.54247568/v1 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_doi |
https://doi.org/10.22541/essoar.171500945.54247568/v1 |
_version_ |
1800741902357626880 |