On the temporal variability of the transport through Drake Passage
A recently obtained series of bottom pressure measurements from various positions in the Drake Passage (DP) has been used to estimate the transport variability of the Antarctic Circumpolar Current (ACC) under the assumption that the variability is predominantly barotropic and thus proportional to th...
Published in: | Journal of Geophysical Research: Oceans |
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1996
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:75238 2023-05-15T14:03:30+02:00 On the temporal variability of the transport through Drake Passage Meredith, Michael P. Vassie, John M. Heywood, Karen J. Spencer, Robert 1996-10-15 https://ueaeprints.uea.ac.uk/id/eprint/75238/ https://doi.org/10.1029/96JC02003 unknown Meredith, Michael P., Vassie, John M., Heywood, Karen J. and Spencer, Robert (1996) On the temporal variability of the transport through Drake Passage. Journal of Geophysical Research - Oceans, 101 (C10). pp. 22485-22494. ISSN 2169-9275 doi:10.1029/96JC02003 Article PeerReviewed 1996 ftuniveastangl https://doi.org/10.1029/96JC02003 2023-01-30T21:52:32Z A recently obtained series of bottom pressure measurements from various positions in the Drake Passage (DP) has been used to estimate the transport variability of the Antarctic Circumpolar Current (ACC) under the assumption that the variability is predominantly barotropic and thus proportional to the north-minus-south pressure difference. The standard deviations in derived transport range from 5.3 Sv in 1993 to 8.9 Sv in 1990 (10-day filter, 1 Sv = 106 m3 s-1). All values are less than the 10 Sv (10-day filter) obtained during the International Southern Ocean Studies (ISOS) program at DP between the mid 1970s and early 1980s [Whitworth and Peterson, 1985]. Although some of this discrepancy is due to differences in procedure in dealing with gaps in the data, our data suggest that the ACC transport can be persistently less variable over several years than was previously thought. In particular, the ISOS data set contains two large-amplitude changes in pressure difference over timescales less than 2 weeks, while no similar events were observed in die more recent data. Although the more recent pressure gauges were deployed at different positions to those used in ISOS, their reliability as indicators of ACC transport changes has been established by examination of simultaneous pressure measurements within DP. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean University of East Anglia: UEA Digital Repository Antarctic Southern Ocean The Antarctic Drake Passage Journal of Geophysical Research: Oceans 101 C10 22485 22494 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
unknown |
description |
A recently obtained series of bottom pressure measurements from various positions in the Drake Passage (DP) has been used to estimate the transport variability of the Antarctic Circumpolar Current (ACC) under the assumption that the variability is predominantly barotropic and thus proportional to the north-minus-south pressure difference. The standard deviations in derived transport range from 5.3 Sv in 1993 to 8.9 Sv in 1990 (10-day filter, 1 Sv = 106 m3 s-1). All values are less than the 10 Sv (10-day filter) obtained during the International Southern Ocean Studies (ISOS) program at DP between the mid 1970s and early 1980s [Whitworth and Peterson, 1985]. Although some of this discrepancy is due to differences in procedure in dealing with gaps in the data, our data suggest that the ACC transport can be persistently less variable over several years than was previously thought. In particular, the ISOS data set contains two large-amplitude changes in pressure difference over timescales less than 2 weeks, while no similar events were observed in die more recent data. Although the more recent pressure gauges were deployed at different positions to those used in ISOS, their reliability as indicators of ACC transport changes has been established by examination of simultaneous pressure measurements within DP. |
format |
Article in Journal/Newspaper |
author |
Meredith, Michael P. Vassie, John M. Heywood, Karen J. Spencer, Robert |
spellingShingle |
Meredith, Michael P. Vassie, John M. Heywood, Karen J. Spencer, Robert On the temporal variability of the transport through Drake Passage |
author_facet |
Meredith, Michael P. Vassie, John M. Heywood, Karen J. Spencer, Robert |
author_sort |
Meredith, Michael P. |
title |
On the temporal variability of the transport through Drake Passage |
title_short |
On the temporal variability of the transport through Drake Passage |
title_full |
On the temporal variability of the transport through Drake Passage |
title_fullStr |
On the temporal variability of the transport through Drake Passage |
title_full_unstemmed |
On the temporal variability of the transport through Drake Passage |
title_sort |
on the temporal variability of the transport through drake passage |
publishDate |
1996 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/75238/ https://doi.org/10.1029/96JC02003 |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
Meredith, Michael P., Vassie, John M., Heywood, Karen J. and Spencer, Robert (1996) On the temporal variability of the transport through Drake Passage. Journal of Geophysical Research - Oceans, 101 (C10). pp. 22485-22494. ISSN 2169-9275 doi:10.1029/96JC02003 |
op_doi |
https://doi.org/10.1029/96JC02003 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
101 |
container_issue |
C10 |
container_start_page |
22485 |
op_container_end_page |
22494 |
_version_ |
1766274180911726592 |