Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters
A kinematic approach is used to diagnose the subduction rates of upperSouthern Ocean waters across seasonally migrating density outcrops at the base of the mixed layer. From an Eulerian viewpoint, the term representing the temporal change in the mixed layer depth (which is labeled as the temporal in...
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Online Access: | https://doi.org/10.1175/JPO-D-12-060.1 http://ecite.utas.edu.au/103129 |
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ftunivtasecite:oai:ecite.utas.edu.au:103129 2023-05-15T18:25:10+02:00 Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters Kwon, EY Downes, SM Sarmiento, JL Farneti, R Deutsch, C 2013 https://doi.org/10.1175/JPO-D-12-060.1 http://ecite.utas.edu.au/103129 en eng Amer Meteorological Soc http://dx.doi.org/10.1175/JPO-D-12-060.1 Kwon, EY and Downes, SM and Sarmiento, JL and Farneti, R and Deutsch, C, Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters, Journal of Physical Oceanography, 43, (6) pp. 1096-1113. ISSN 0022-3670 (2013) [Refereed Article] http://ecite.utas.edu.au/103129 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2013 ftunivtasecite https://doi.org/10.1175/JPO-D-12-060.1 2019-12-13T22:04:36Z A kinematic approach is used to diagnose the subduction rates of upperSouthern Ocean waters across seasonally migrating density outcrops at the base of the mixed layer. From an Eulerian viewpoint, the term representing the temporal change in the mixed layer depth (which is labeled as the temporal induction in this study; i.e., S temp = ∂ h /∂ t where h is the mixed layer thickness, and t is time) vanishes over several annual cycles. Following seasonally migrating density outcrops, however, the temporal induction is attributed partly to the temporal change in the mixed layer thickness averaged over a density outcrop following its seasonally varying position and partly to the lateral movement of the outcrop position intersecting the sloping mixed layer base. Neither the temporal induction following an outcrop nor its integral over the outcrop area vanishes over several annual cycles. Instead, the seasonal eddy subduction , which arises primarily because of the subannual correlations between the seasonal cycles of the mixed layer depth and the outcrop area, explains the key mechanism by which mode waters are transferred from the mixed layer to the underlying pycnocline. The time-mean exchange rate of waters across the base of the mixed layer is substantially different from the exchange rate of waters across the fixed winter mixed layer base in mode water density classes. Nearly 40% of the newly formed Southern Ocean mode waters appear to be diapycnally transformed within the seasonal pycnocline before either being subducted into the main pycnocline or entrained back to the mixed layer through lighter density classes. Article in Journal/Newspaper Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean Journal of Physical Oceanography 43 6 1096 1113 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Kwon, EY Downes, SM Sarmiento, JL Farneti, R Deutsch, C Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
A kinematic approach is used to diagnose the subduction rates of upperSouthern Ocean waters across seasonally migrating density outcrops at the base of the mixed layer. From an Eulerian viewpoint, the term representing the temporal change in the mixed layer depth (which is labeled as the temporal induction in this study; i.e., S temp = ∂ h /∂ t where h is the mixed layer thickness, and t is time) vanishes over several annual cycles. Following seasonally migrating density outcrops, however, the temporal induction is attributed partly to the temporal change in the mixed layer thickness averaged over a density outcrop following its seasonally varying position and partly to the lateral movement of the outcrop position intersecting the sloping mixed layer base. Neither the temporal induction following an outcrop nor its integral over the outcrop area vanishes over several annual cycles. Instead, the seasonal eddy subduction , which arises primarily because of the subannual correlations between the seasonal cycles of the mixed layer depth and the outcrop area, explains the key mechanism by which mode waters are transferred from the mixed layer to the underlying pycnocline. The time-mean exchange rate of waters across the base of the mixed layer is substantially different from the exchange rate of waters across the fixed winter mixed layer base in mode water density classes. Nearly 40% of the newly formed Southern Ocean mode waters appear to be diapycnally transformed within the seasonal pycnocline before either being subducted into the main pycnocline or entrained back to the mixed layer through lighter density classes. |
format |
Article in Journal/Newspaper |
author |
Kwon, EY Downes, SM Sarmiento, JL Farneti, R Deutsch, C |
author_facet |
Kwon, EY Downes, SM Sarmiento, JL Farneti, R Deutsch, C |
author_sort |
Kwon, EY |
title |
Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters |
title_short |
Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters |
title_full |
Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters |
title_fullStr |
Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters |
title_full_unstemmed |
Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters |
title_sort |
role of the seasonal cycle in the subduction rates of upper-southern ocean waters |
publisher |
Amer Meteorological Soc |
publishDate |
2013 |
url |
https://doi.org/10.1175/JPO-D-12-060.1 http://ecite.utas.edu.au/103129 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://dx.doi.org/10.1175/JPO-D-12-060.1 Kwon, EY and Downes, SM and Sarmiento, JL and Farneti, R and Deutsch, C, Role of the seasonal cycle in the subduction rates of upper-Southern Ocean waters, Journal of Physical Oceanography, 43, (6) pp. 1096-1113. ISSN 0022-3670 (2013) [Refereed Article] http://ecite.utas.edu.au/103129 |
op_doi |
https://doi.org/10.1175/JPO-D-12-060.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
43 |
container_issue |
6 |
container_start_page |
1096 |
op_container_end_page |
1113 |
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1766206411058970624 |