Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic
Author Posting. © The Authors, 2004. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 52 (2005): 545-564, doi:1...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/412 2023-05-15T13:15:51+02:00 Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic Nunez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu Richardson, Philip L. Davis, Russ E. 2004-12-09 67494 bytes 32086 bytes 59168 bytes 57160 bytes 62561 bytes 62378 bytes 475507 bytes 48741 bytes 47222 bytes 617941 bytes 267617 bytes application/pdf https://hdl.handle.net/1912/412 en_US eng https://doi.org/10.1016/j.dsr2.2004.12.006 https://hdl.handle.net/1912/412 Antarctic Intermediate Water (AAIW) Floats Neutral density surfaces South Atlantic Lagrangian circulation Transports Objective analysis Preprint 2004 ftwhoas https://doi.org/10.1016/j.dsr2.2004.12.006 2022-05-28T22:56:52Z Author Posting. © The Authors, 2004. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 52 (2005): 545-564, doi:10.1016/j.dsr2.2004.12.006. This study combines float data from different projects collected between 1991 and 2003 in the South Atlantic to describe the flow of Antarctic Intermediate Water (AAIW). Velocity spacetime averages are calculated for various grid resolutions and with cells deformed to match the bathymetry, f/H or f/h (with H being the water depth and h being the thickness of the AAIW layer). When judged by the degree of alignment between respective isolines and the resulting average velocity fields, the best grid is based on a nominal cell size of 3º (latitude) by 4º (longitude) with cell shapes deformed according to f/h. Using this grid, objectively estimated mean currents (and their associated errors), as well as meridional and zonal volume transports are estimated. Results show an anticyclonic Subtropical Gyre centred near 36ºS and spanning from 23º±1°S to 46° ± 1ºS. The South Atlantic Current meanders from 33ºS to 46ºS and shows a mean speed of 9.6 ± 7.8 cm s-1 (8.5 Sv ± 3.5 Sv; 1 Sv = 1×106 m3 s-1). The northern branch of the Subtropical Gyre is located between 22ºS and 32ºS and flows westward with a mean speed of 4.7 ± 3.3 cm s-1 (9.3 Sv ± 3.4 Sv). Evidence of a cyclonic Tropical Gyre divided in two sub-cells is visible on the stream function. This work is supported through NSF-Grant no. OCE-0095647 and through the Alfred Wegener Institute for Polar and Marine Research. Report Alfred Wegener Institute Antarc* Antarctic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 52 3-4 545 564 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Antarctic Intermediate Water (AAIW) Floats Neutral density surfaces South Atlantic Lagrangian circulation Transports Objective analysis |
spellingShingle |
Antarctic Intermediate Water (AAIW) Floats Neutral density surfaces South Atlantic Lagrangian circulation Transports Objective analysis Nunez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu Richardson, Philip L. Davis, Russ E. Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic |
topic_facet |
Antarctic Intermediate Water (AAIW) Floats Neutral density surfaces South Atlantic Lagrangian circulation Transports Objective analysis |
description |
Author Posting. © The Authors, 2004. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 52 (2005): 545-564, doi:10.1016/j.dsr2.2004.12.006. This study combines float data from different projects collected between 1991 and 2003 in the South Atlantic to describe the flow of Antarctic Intermediate Water (AAIW). Velocity spacetime averages are calculated for various grid resolutions and with cells deformed to match the bathymetry, f/H or f/h (with H being the water depth and h being the thickness of the AAIW layer). When judged by the degree of alignment between respective isolines and the resulting average velocity fields, the best grid is based on a nominal cell size of 3º (latitude) by 4º (longitude) with cell shapes deformed according to f/h. Using this grid, objectively estimated mean currents (and their associated errors), as well as meridional and zonal volume transports are estimated. Results show an anticyclonic Subtropical Gyre centred near 36ºS and spanning from 23º±1°S to 46° ± 1ºS. The South Atlantic Current meanders from 33ºS to 46ºS and shows a mean speed of 9.6 ± 7.8 cm s-1 (8.5 Sv ± 3.5 Sv; 1 Sv = 1×106 m3 s-1). The northern branch of the Subtropical Gyre is located between 22ºS and 32ºS and flows westward with a mean speed of 4.7 ± 3.3 cm s-1 (9.3 Sv ± 3.4 Sv). Evidence of a cyclonic Tropical Gyre divided in two sub-cells is visible on the stream function. This work is supported through NSF-Grant no. OCE-0095647 and through the Alfred Wegener Institute for Polar and Marine Research. |
format |
Report |
author |
Nunez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu Richardson, Philip L. Davis, Russ E. |
author_facet |
Nunez-Riboni, Ismael Boebel, Olaf Ollitrault, Michel You, Yuzhu Richardson, Philip L. Davis, Russ E. |
author_sort |
Nunez-Riboni, Ismael |
title |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic |
title_short |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic |
title_full |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic |
title_fullStr |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic |
title_full_unstemmed |
Lagrangian circulation of Antarctic Intermediate Water in the subtropical South Atlantic |
title_sort |
lagrangian circulation of antarctic intermediate water in the subtropical south atlantic |
publishDate |
2004 |
url |
https://hdl.handle.net/1912/412 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Alfred Wegener Institute Antarc* Antarctic |
genre_facet |
Alfred Wegener Institute Antarc* Antarctic |
op_relation |
https://doi.org/10.1016/j.dsr2.2004.12.006 https://hdl.handle.net/1912/412 |
op_doi |
https://doi.org/10.1016/j.dsr2.2004.12.006 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
52 |
container_issue |
3-4 |
container_start_page |
545 |
op_container_end_page |
564 |
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1766271328928661504 |