Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean
Velocity measurements from a shipboard acoustic Doppler current profiler (ADCP) are used as a reference for geostrophic current calculations on six sections across the Subantarctic Front (SAF) in the Pacific Ocean. The resulting cross‐track velocity estimates near the bottom range from 4 to 10 cm s−...
Published in: | Journal of Geophysical Research: Oceans |
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1278 2023-07-30T03:58:30+02:00 Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean Donohue, Kathleen A. Firing, Erin Chen, Shuiming 2001-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/223 https://doi.org/10.1029/2000JC000293 https://digitalcommons.uri.edu/context/gsofacpubs/article/1278/viewcontent/Donohue_AbsoluteGeostrophic_2001.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/223 doi:10.1029/2000JC000293 https://digitalcommons.uri.edu/context/gsofacpubs/article/1278/viewcontent/Donohue_AbsoluteGeostrophic_2001.pdf Graduate School of Oceanography Faculty Publications text 2001 ftunivrhodeislan https://doi.org/10.1029/2000JC000293 2023-07-17T18:56:30Z Velocity measurements from a shipboard acoustic Doppler current profiler (ADCP) are used as a reference for geostrophic current calculations on six sections across the Subantarctic Front (SAF) in the Pacific Ocean. The resulting cross‐track velocity estimates near the bottom range from 4 to 10 cm s−1 to the east in the eastward jet at the SAF; in adjacent regions of westward surface flow, the near‐bottom velocity is usually to the west. On one section where simultaneous lowered ADCP velocity profiles are available, they confirm the results from the shipboard ADCP. Annual mean velocity sections from the Parallel Ocean Program numerical model also show near‐bottom velocities exceeding 5 cm s−1, with the same tendency for the zonal velocity component near the bottom to match the direction of the surface jets. Transport across the entire Antarctic Circumpolar Current (ACC) cannot be estimated accurately from ADCP‐referenced geostrophic sections because even a very small cross‐track bias integrates to a large error. A preliminary look at the 1992 model transport stream function shows that the effect of bottom‐referencing varies from section to section; it can cause 40‐Sv recirculations to be missed, and can cause net transport to be underestimated or overestimated by O (30 Sv). Text Antarc* Antarctic University of Rhode Island: DigitalCommons@URI Antarctic Pacific Journal of Geophysical Research: Oceans 106 C9 19869 19882 |
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Open Polar |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
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description |
Velocity measurements from a shipboard acoustic Doppler current profiler (ADCP) are used as a reference for geostrophic current calculations on six sections across the Subantarctic Front (SAF) in the Pacific Ocean. The resulting cross‐track velocity estimates near the bottom range from 4 to 10 cm s−1 to the east in the eastward jet at the SAF; in adjacent regions of westward surface flow, the near‐bottom velocity is usually to the west. On one section where simultaneous lowered ADCP velocity profiles are available, they confirm the results from the shipboard ADCP. Annual mean velocity sections from the Parallel Ocean Program numerical model also show near‐bottom velocities exceeding 5 cm s−1, with the same tendency for the zonal velocity component near the bottom to match the direction of the surface jets. Transport across the entire Antarctic Circumpolar Current (ACC) cannot be estimated accurately from ADCP‐referenced geostrophic sections because even a very small cross‐track bias integrates to a large error. A preliminary look at the 1992 model transport stream function shows that the effect of bottom‐referencing varies from section to section; it can cause 40‐Sv recirculations to be missed, and can cause net transport to be underestimated or overestimated by O (30 Sv). |
format |
Text |
author |
Donohue, Kathleen A. Firing, Erin Chen, Shuiming |
spellingShingle |
Donohue, Kathleen A. Firing, Erin Chen, Shuiming Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean |
author_facet |
Donohue, Kathleen A. Firing, Erin Chen, Shuiming |
author_sort |
Donohue, Kathleen A. |
title |
Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean |
title_short |
Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean |
title_full |
Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean |
title_fullStr |
Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean |
title_full_unstemmed |
Absolute geostrophic velocity within the Subantarctic Front in the Pacific Ocean |
title_sort |
absolute geostrophic velocity within the subantarctic front in the pacific ocean |
publisher |
DigitalCommons@URI |
publishDate |
2001 |
url |
https://digitalcommons.uri.edu/gsofacpubs/223 https://doi.org/10.1029/2000JC000293 https://digitalcommons.uri.edu/context/gsofacpubs/article/1278/viewcontent/Donohue_AbsoluteGeostrophic_2001.pdf |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/223 doi:10.1029/2000JC000293 https://digitalcommons.uri.edu/context/gsofacpubs/article/1278/viewcontent/Donohue_AbsoluteGeostrophic_2001.pdf |
op_doi |
https://doi.org/10.1029/2000JC000293 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
106 |
container_issue |
C9 |
container_start_page |
19869 |
op_container_end_page |
19882 |
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1772821276287565824 |