Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill
The Vema Channel acts as a major conduit for the equatorward spreading of Antarctic Bottom Water between the Argentine and Brazil Basins. For almost two years the thermal stratification above its saddle depth (4660 m) – called Vema Sill – was recorded by moored thermistors and current meters. The lo...
Published in: | Progress in Oceanography |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2008
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/5648/ https://oceanrep.geomar.de/id/eprint/5648/1/98_Zenk_2008_TemperatureFluctuationsAndCurrentShear_Artzeit_pubid9304.pdf https://doi.org/10.1016/j.pocean.2006.05.006 |
id |
ftoceanrep:oai:oceanrep.geomar.de:5648 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:5648 2023-05-15T13:41:27+02:00 Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill Zenk, Walter 2008 text https://oceanrep.geomar.de/id/eprint/5648/ https://oceanrep.geomar.de/id/eprint/5648/1/98_Zenk_2008_TemperatureFluctuationsAndCurrentShear_Artzeit_pubid9304.pdf https://doi.org/10.1016/j.pocean.2006.05.006 en eng Elsevier https://oceanrep.geomar.de/id/eprint/5648/1/98_Zenk_2008_TemperatureFluctuationsAndCurrentShear_Artzeit_pubid9304.pdf Zenk, W. (2008) Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill. Progress in Oceanography, 77 (4). pp. 276-284. DOI 10.1016/j.pocean.2006.05.006 <https://doi.org/10.1016/j.pocean.2006.05.006>. doi:10.1016/j.pocean.2006.05.006 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2008 ftoceanrep https://doi.org/10.1016/j.pocean.2006.05.006 2023-04-07T14:51:22Z The Vema Channel acts as a major conduit for the equatorward spreading of Antarctic Bottom Water between the Argentine and Brazil Basins. For almost two years the thermal stratification above its saddle depth (4660 m) – called Vema Sill – was recorded by moored thermistors and current meters. The lowest 490 m of the water column was instrumented to monitor the well-developed benthic boundary layer of Antarctic Bottom Water. The latter can be subdivided into Weddell Sea Deep Water on the sea bed and lower Circumpolar Deep Water above it. The data show fluctuations on various scales including periods, each about 1–2 weeks long, when the abyssal stratification virtually disappeared. Assuming a stable ratio between density and temperature, time series of bulk Richardson numbers are estimated from temperature and current shear data. The results suggest a potential for intermittent episodes of locally generated vertical mixing. Article in Journal/Newspaper Antarc* Antarctic Weddell Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Argentine Weddell Weddell Sea Progress in Oceanography 77 4 276 284 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Vema Channel acts as a major conduit for the equatorward spreading of Antarctic Bottom Water between the Argentine and Brazil Basins. For almost two years the thermal stratification above its saddle depth (4660 m) – called Vema Sill – was recorded by moored thermistors and current meters. The lowest 490 m of the water column was instrumented to monitor the well-developed benthic boundary layer of Antarctic Bottom Water. The latter can be subdivided into Weddell Sea Deep Water on the sea bed and lower Circumpolar Deep Water above it. The data show fluctuations on various scales including periods, each about 1–2 weeks long, when the abyssal stratification virtually disappeared. Assuming a stable ratio between density and temperature, time series of bulk Richardson numbers are estimated from temperature and current shear data. The results suggest a potential for intermittent episodes of locally generated vertical mixing. |
format |
Article in Journal/Newspaper |
author |
Zenk, Walter |
spellingShingle |
Zenk, Walter Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill |
author_facet |
Zenk, Walter |
author_sort |
Zenk, Walter |
title |
Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill |
title_short |
Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill |
title_full |
Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill |
title_fullStr |
Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill |
title_full_unstemmed |
Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill |
title_sort |
temperature fluctuations and current shear in antarctic bottom water at the vema sill |
publisher |
Elsevier |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/5648/ https://oceanrep.geomar.de/id/eprint/5648/1/98_Zenk_2008_TemperatureFluctuationsAndCurrentShear_Artzeit_pubid9304.pdf https://doi.org/10.1016/j.pocean.2006.05.006 |
geographic |
Antarctic Argentine Weddell Weddell Sea |
geographic_facet |
Antarctic Argentine Weddell Weddell Sea |
genre |
Antarc* Antarctic Weddell Sea |
genre_facet |
Antarc* Antarctic Weddell Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/5648/1/98_Zenk_2008_TemperatureFluctuationsAndCurrentShear_Artzeit_pubid9304.pdf Zenk, W. (2008) Temperature Fluctuations and Current Shear in Antarctic Bottom Water at the Vema Sill. Progress in Oceanography, 77 (4). pp. 276-284. DOI 10.1016/j.pocean.2006.05.006 <https://doi.org/10.1016/j.pocean.2006.05.006>. doi:10.1016/j.pocean.2006.05.006 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2006.05.006 |
container_title |
Progress in Oceanography |
container_volume |
77 |
container_issue |
4 |
container_start_page |
276 |
op_container_end_page |
284 |
_version_ |
1766150951974993920 |