An additional deep-water mass in Drake Passage as revealed by 3He data
We present 3He data froma repeat section across Drake Passage, fromthree sections off the South American continent in the Pacific, at 28?S, 35?S, and 43?S, and fromthree sections in the Atlantic, eastward of the Malvinas, close to 35?W, and near the Greenwich Meridian. In Drake Passage, a distinct h...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:15925 2023-06-06T11:46:18+02:00 An additional deep-water mass in Drake Passage as revealed by 3He data Well, Roland Roether, Wolfgang Stevens, David P. 2003 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/15925/ https://ueaeprints.uea.ac.uk/id/eprint/15925/1/DS_31.pdf https://doi.org/10.1016/S0967-0637(03)00050-5 en eng https://ueaeprints.uea.ac.uk/id/eprint/15925/1/DS_31.pdf Well, Roland, Roether, Wolfgang and Stevens, David P. (2003) An additional deep-water mass in Drake Passage as revealed by 3He data. Deep Sea Research Part I: Oceanographic Research Papers, 50 (9). pp. 1079-1098. ISSN 1879-0119 doi:10.1016/S0967-0637(03)00050-5 Article PeerReviewed 2003 ftuniveastangl https://doi.org/10.1016/S0967-0637(03)00050-5 2023-04-13T22:31:21Z We present 3He data froma repeat section across Drake Passage, fromthree sections off the South American continent in the Pacific, at 28?S, 35?S, and 43?S, and fromthree sections in the Atlantic, eastward of the Malvinas, close to 35?W, and near the Greenwich Meridian. In Drake Passage, a distinct high-3He signal is observed that is centered just above the boundary of the Lower and the Upper Circumpolar Deep Water (LCDW, UCDW), and is concentrated towards the northern continental slope. 3He concentrations in the Antarctic Circumpolar Current (ACC) upstream of Drake Passage (World Ocean Circulation Experiment section P19 at 88?W) are markedly lower than those found in Drake Passage, and a regional source of primordial helium in the path of the ACC that might cause the high-3He feature can be ruled out. We explain the feature by addition of high-3He waters present at the 43?S Pacific section. This supports a previous, similar interpretation of a low-salinity anomaly in Drake Passage (Naveira Garabato et al., Deep- Sea Research I 49 (2002) 681), that is strongly related to the high-3He feature. Employing multiparameter water mass analysis (including 3He as a parameter), we find that deep waters as met at the 43?S Pacific section, flowing south along the South American continental slope, contribute substantially to the ACC waters in Drake Passage (fractions exceed 50% locally). Lesser, but laterally more extended contributions are found east of the Malvinas, and still smaller ones are present at 35?W and at the Greenwich Meridian. Using velocity measurements from one of the two Drake Passage sections, we estimate the volume transport of these waters to be 7.071.2 Sv, but the average transport may be somewhat lower as the other realization had a less pronounced signal. The enhanced 3He signature in Drake Passage is essentially confined north of the Polar Front. Further downstreamthe signature crosses this front, to the extent that at 35?W the contributions south and north of it are of similar magnitude. At the same ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage University of East Anglia: UEA Digital Repository Antarctic The Antarctic Drake Passage Pacific Greenwich Deep Sea Research Part I: Oceanographic Research Papers 50 9 1079 1098 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
We present 3He data froma repeat section across Drake Passage, fromthree sections off the South American continent in the Pacific, at 28?S, 35?S, and 43?S, and fromthree sections in the Atlantic, eastward of the Malvinas, close to 35?W, and near the Greenwich Meridian. In Drake Passage, a distinct high-3He signal is observed that is centered just above the boundary of the Lower and the Upper Circumpolar Deep Water (LCDW, UCDW), and is concentrated towards the northern continental slope. 3He concentrations in the Antarctic Circumpolar Current (ACC) upstream of Drake Passage (World Ocean Circulation Experiment section P19 at 88?W) are markedly lower than those found in Drake Passage, and a regional source of primordial helium in the path of the ACC that might cause the high-3He feature can be ruled out. We explain the feature by addition of high-3He waters present at the 43?S Pacific section. This supports a previous, similar interpretation of a low-salinity anomaly in Drake Passage (Naveira Garabato et al., Deep- Sea Research I 49 (2002) 681), that is strongly related to the high-3He feature. Employing multiparameter water mass analysis (including 3He as a parameter), we find that deep waters as met at the 43?S Pacific section, flowing south along the South American continental slope, contribute substantially to the ACC waters in Drake Passage (fractions exceed 50% locally). Lesser, but laterally more extended contributions are found east of the Malvinas, and still smaller ones are present at 35?W and at the Greenwich Meridian. Using velocity measurements from one of the two Drake Passage sections, we estimate the volume transport of these waters to be 7.071.2 Sv, but the average transport may be somewhat lower as the other realization had a less pronounced signal. The enhanced 3He signature in Drake Passage is essentially confined north of the Polar Front. Further downstreamthe signature crosses this front, to the extent that at 35?W the contributions south and north of it are of similar magnitude. At the same ... |
format |
Article in Journal/Newspaper |
author |
Well, Roland Roether, Wolfgang Stevens, David P. |
spellingShingle |
Well, Roland Roether, Wolfgang Stevens, David P. An additional deep-water mass in Drake Passage as revealed by 3He data |
author_facet |
Well, Roland Roether, Wolfgang Stevens, David P. |
author_sort |
Well, Roland |
title |
An additional deep-water mass in Drake Passage as revealed by 3He data |
title_short |
An additional deep-water mass in Drake Passage as revealed by 3He data |
title_full |
An additional deep-water mass in Drake Passage as revealed by 3He data |
title_fullStr |
An additional deep-water mass in Drake Passage as revealed by 3He data |
title_full_unstemmed |
An additional deep-water mass in Drake Passage as revealed by 3He data |
title_sort |
additional deep-water mass in drake passage as revealed by 3he data |
publishDate |
2003 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/15925/ https://ueaeprints.uea.ac.uk/id/eprint/15925/1/DS_31.pdf https://doi.org/10.1016/S0967-0637(03)00050-5 |
geographic |
Antarctic The Antarctic Drake Passage Pacific Greenwich |
geographic_facet |
Antarctic The Antarctic Drake Passage Pacific Greenwich |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/15925/1/DS_31.pdf Well, Roland, Roether, Wolfgang and Stevens, David P. (2003) An additional deep-water mass in Drake Passage as revealed by 3He data. Deep Sea Research Part I: Oceanographic Research Papers, 50 (9). pp. 1079-1098. ISSN 1879-0119 doi:10.1016/S0967-0637(03)00050-5 |
op_doi |
https://doi.org/10.1016/S0967-0637(03)00050-5 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
50 |
container_issue |
9 |
container_start_page |
1079 |
op_container_end_page |
1098 |
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1767951556999643136 |