Lagrangian pathways of upwelling in the Southern Ocean
The spatial and temporal variability of upwelling into the mixed layer in the Southern Ocean is studied using a 1/10° ocean general circulation model. Virtual drifters are released in a regularly-spaced pattern across the Southern Ocean at depths of 250, 500, and 1000 m during both summer and winter...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2016
|
Subjects: | |
Online Access: | https://authors.library.caltech.edu/69507/ https://authors.library.caltech.edu/69507/2/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://authors.library.caltech.edu/69507/1/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://resolver.caltech.edu/CaltechAUTHORS:20160809-075333471 |
id |
ftcaltechauth:oai:authors.library.caltech.edu:69507 |
---|---|
record_format |
openpolar |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:69507 2023-05-15T16:02:33+02:00 Lagrangian pathways of upwelling in the Southern Ocean Viglione, Giuliana A. Thompson, Andrew F. 2016-08 application/pdf https://authors.library.caltech.edu/69507/ https://authors.library.caltech.edu/69507/2/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://authors.library.caltech.edu/69507/1/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://resolver.caltech.edu/CaltechAUTHORS:20160809-075333471 en eng American Geophysical Union https://authors.library.caltech.edu/69507/2/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://authors.library.caltech.edu/69507/1/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf Viglione, Giuliana A. and Thompson, Andrew F. (2016) Lagrangian pathways of upwelling in the Southern Ocean. Journal of Geophysical Research. Oceans, 121 (8). pp. 6295-6309. ISSN 2169-9275. doi:10.1002/2016JC011773. https://resolver.caltech.edu/CaltechAUTHORS:20160809-075333471 <https://resolver.caltech.edu/CaltechAUTHORS:20160809-075333471> other Article PeerReviewed 2016 ftcaltechauth https://doi.org/10.1002/2016JC011773 2021-11-18T18:38:40Z The spatial and temporal variability of upwelling into the mixed layer in the Southern Ocean is studied using a 1/10° ocean general circulation model. Virtual drifters are released in a regularly-spaced pattern across the Southern Ocean at depths of 250, 500, and 1000 m during both summer and winter months. The drifters are advected along isopycnals for a period of four years, unless they outcrop into the mixed layer, where lateral advection and a parameterization of vertical mixing is applied. The focus of this study is on the discrete exchange between the model mixed layer and the interior. Localization of interior-mixed layer exchange occurs downstream of major topographic features across the Indian and Pacific basins, creating “hotspots” of outcropping. Minimal outcropping occurs in the Atlantic basin, while 59% of drifters outcrop in the Pacific sector and in Drake Passage (the region from 140° W to 40° W), a disproportionately large amount even when considering the relative basin sizes. Due to spatial and temporal variations in mixed layer depth, the Lagrangian trajectories provide a statistical measure of mixed layer residence times. For each exchange into the mixed layer, the residence time has a Rayleigh distribution with a mean of 30 days; the cumulative residence time of the drifters is 261 ± 194 days, over a period of four years. These results suggest that certain oceanic gas concentrations, such as CO_2 and ^(14)C, will likely not reach equilibrium with the atmosphere before being re-subducted. Article in Journal/Newspaper Drake Passage Southern Ocean Caltech Authors (California Institute of Technology) Drake Passage Indian Pacific Southern Ocean Journal of Geophysical Research: Oceans 121 8 6295 6309 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
description |
The spatial and temporal variability of upwelling into the mixed layer in the Southern Ocean is studied using a 1/10° ocean general circulation model. Virtual drifters are released in a regularly-spaced pattern across the Southern Ocean at depths of 250, 500, and 1000 m during both summer and winter months. The drifters are advected along isopycnals for a period of four years, unless they outcrop into the mixed layer, where lateral advection and a parameterization of vertical mixing is applied. The focus of this study is on the discrete exchange between the model mixed layer and the interior. Localization of interior-mixed layer exchange occurs downstream of major topographic features across the Indian and Pacific basins, creating “hotspots” of outcropping. Minimal outcropping occurs in the Atlantic basin, while 59% of drifters outcrop in the Pacific sector and in Drake Passage (the region from 140° W to 40° W), a disproportionately large amount even when considering the relative basin sizes. Due to spatial and temporal variations in mixed layer depth, the Lagrangian trajectories provide a statistical measure of mixed layer residence times. For each exchange into the mixed layer, the residence time has a Rayleigh distribution with a mean of 30 days; the cumulative residence time of the drifters is 261 ± 194 days, over a period of four years. These results suggest that certain oceanic gas concentrations, such as CO_2 and ^(14)C, will likely not reach equilibrium with the atmosphere before being re-subducted. |
format |
Article in Journal/Newspaper |
author |
Viglione, Giuliana A. Thompson, Andrew F. |
spellingShingle |
Viglione, Giuliana A. Thompson, Andrew F. Lagrangian pathways of upwelling in the Southern Ocean |
author_facet |
Viglione, Giuliana A. Thompson, Andrew F. |
author_sort |
Viglione, Giuliana A. |
title |
Lagrangian pathways of upwelling in the Southern Ocean |
title_short |
Lagrangian pathways of upwelling in the Southern Ocean |
title_full |
Lagrangian pathways of upwelling in the Southern Ocean |
title_fullStr |
Lagrangian pathways of upwelling in the Southern Ocean |
title_full_unstemmed |
Lagrangian pathways of upwelling in the Southern Ocean |
title_sort |
lagrangian pathways of upwelling in the southern ocean |
publisher |
American Geophysical Union |
publishDate |
2016 |
url |
https://authors.library.caltech.edu/69507/ https://authors.library.caltech.edu/69507/2/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://authors.library.caltech.edu/69507/1/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://resolver.caltech.edu/CaltechAUTHORS:20160809-075333471 |
geographic |
Drake Passage Indian Pacific Southern Ocean |
geographic_facet |
Drake Passage Indian Pacific Southern Ocean |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_relation |
https://authors.library.caltech.edu/69507/2/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf https://authors.library.caltech.edu/69507/1/Viglione_et_al-2016-Journal_of_Geophysical_Research-_Oceans.pdf Viglione, Giuliana A. and Thompson, Andrew F. (2016) Lagrangian pathways of upwelling in the Southern Ocean. Journal of Geophysical Research. Oceans, 121 (8). pp. 6295-6309. ISSN 2169-9275. doi:10.1002/2016JC011773. https://resolver.caltech.edu/CaltechAUTHORS:20160809-075333471 <https://resolver.caltech.edu/CaltechAUTHORS:20160809-075333471> |
op_rights |
other |
op_doi |
https://doi.org/10.1002/2016JC011773 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
8 |
container_start_page |
6295 |
op_container_end_page |
6309 |
_version_ |
1766398219115298816 |