Tracing southwest pacific bottom water using potential vorticity and helium-3
This study uses potential vorticity and other tracers to identify the pathways of the densest form of Circumpolar Deep Water in the South Pacific, termed "Southwest Pacific Bottom Water" (SPBW), along the 28.2 kg m sup(-3) surface. This study focuses on the potential vorticity signals asso...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/71783 2023-05-15T13:56:44+02:00 Tracing southwest pacific bottom water using potential vorticity and helium-3 Downes, Stephanie Key, Robert M Orsi, Alejandro H Speer, Kevin G Swift, James H 2015-12-13T22:19:24Z http://hdl.handle.net/1885/71783 unknown American Meteorological Society 0022-3670 http://hdl.handle.net/1885/71783 Journal of Physical Oceanography Journal article 2015 ftanucanberra 2015-12-21T23:47:14Z This study uses potential vorticity and other tracers to identify the pathways of the densest form of Circumpolar Deep Water in the South Pacific, termed "Southwest Pacific Bottom Water" (SPBW), along the 28.2 kg m sup(-3) surface. This study focuses on the potential vorticity signals associated with three major dynamical processes occurring in the vicinity of the Pacific-Antarctic Ridge: 1) the strong flow of the Antarctic Circumpolar Current (ACC), 2) lateral eddy stirring, and 3) heat and stratification changes in bottom waters induced by hydrothermal vents. These processes result in southward and downstream advection of low potential vorticity along rising isopycnal surfaces. Using δsup(3)He released from the hydrothermal vents, the influence of volcanic activity on the SPBW may be traced across the South Pacific along the path of the ACC to Drake Passage. SPBW also flowswithin the southern limb of the Ross Gyre, reaching the Antarctic Slope in places and contributes viaentrainment to the formation of Antarctic Bottom Water. Finally, it is shown that the magnitude and location of the potential vorticity signals associated with SPBW have endured over at least the last two decades, and that they are unique to the South Pacific sector. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Australian National University: ANU Digital Collections Antarctic Drake Passage Pacific The Antarctic |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
This study uses potential vorticity and other tracers to identify the pathways of the densest form of Circumpolar Deep Water in the South Pacific, termed "Southwest Pacific Bottom Water" (SPBW), along the 28.2 kg m sup(-3) surface. This study focuses on the potential vorticity signals associated with three major dynamical processes occurring in the vicinity of the Pacific-Antarctic Ridge: 1) the strong flow of the Antarctic Circumpolar Current (ACC), 2) lateral eddy stirring, and 3) heat and stratification changes in bottom waters induced by hydrothermal vents. These processes result in southward and downstream advection of low potential vorticity along rising isopycnal surfaces. Using δsup(3)He released from the hydrothermal vents, the influence of volcanic activity on the SPBW may be traced across the South Pacific along the path of the ACC to Drake Passage. SPBW also flowswithin the southern limb of the Ross Gyre, reaching the Antarctic Slope in places and contributes viaentrainment to the formation of Antarctic Bottom Water. Finally, it is shown that the magnitude and location of the potential vorticity signals associated with SPBW have endured over at least the last two decades, and that they are unique to the South Pacific sector. |
format |
Article in Journal/Newspaper |
author |
Downes, Stephanie Key, Robert M Orsi, Alejandro H Speer, Kevin G Swift, James H |
spellingShingle |
Downes, Stephanie Key, Robert M Orsi, Alejandro H Speer, Kevin G Swift, James H Tracing southwest pacific bottom water using potential vorticity and helium-3 |
author_facet |
Downes, Stephanie Key, Robert M Orsi, Alejandro H Speer, Kevin G Swift, James H |
author_sort |
Downes, Stephanie |
title |
Tracing southwest pacific bottom water using potential vorticity and helium-3 |
title_short |
Tracing southwest pacific bottom water using potential vorticity and helium-3 |
title_full |
Tracing southwest pacific bottom water using potential vorticity and helium-3 |
title_fullStr |
Tracing southwest pacific bottom water using potential vorticity and helium-3 |
title_full_unstemmed |
Tracing southwest pacific bottom water using potential vorticity and helium-3 |
title_sort |
tracing southwest pacific bottom water using potential vorticity and helium-3 |
publisher |
American Meteorological Society |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/71783 |
geographic |
Antarctic Drake Passage Pacific The Antarctic |
geographic_facet |
Antarctic Drake Passage Pacific The Antarctic |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_source |
Journal of Physical Oceanography |
op_relation |
0022-3670 http://hdl.handle.net/1885/71783 |
_version_ |
1766264315791278080 |