Observed storm track dynamics in Drake Passage
The dynamics of an oceanic storm trackwhere energy and enstrophy transfer between the mean flow and eddiesare investigated using observations from an eddy-rich region of the Antarctic Circumpolar Current downstream of the Shackleton Fracture Zone (SFZ) in Drake Passage. Four years of measurements by...
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Online Access: | https://doi.org/10.1175/JPO-D-18-0150.1 http://ecite.utas.edu.au/140517 |
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ftunivtasecite:oai:ecite.utas.edu.au:140517 2023-05-15T13:42:40+02:00 Observed storm track dynamics in Drake Passage Foppert, A 2019 https://doi.org/10.1175/JPO-D-18-0150.1 http://ecite.utas.edu.au/140517 en eng Amer Meteorological Soc http://dx.doi.org/10.1175/JPO-D-18-0150.1 Foppert, A, Observed storm track dynamics in Drake Passage, Journal of Physical Oceanography, 49, (3) pp. 867-884. ISSN 0022-3670 (2019) [Refereed Article] http://ecite.utas.edu.au/140517 Earth Sciences Oceanography Physical oceanography Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1175/JPO-D-18-0150.1 2022-08-29T22:18:01Z The dynamics of an oceanic storm trackwhere energy and enstrophy transfer between the mean flow and eddiesare investigated using observations from an eddy-rich region of the Antarctic Circumpolar Current downstream of the Shackleton Fracture Zone (SFZ) in Drake Passage. Four years of measurements by an array of current- and pressure-recording inverted echo sounders deployed between November 2007 and November 2011 are used to diagnose eddymean flow interactions and provide insight into physical mechanisms for these transfers. Averaged within the upper to mid-water column (4001000-m depth) and over the 4-yr-record mean field, eddy potential energy is highest in the western part of the storm track and maximum eddy kinetic energy occurs farther away from the SFZ, shifting the proportion of eddy energies from to about 1 along the storm track. There are enhanced mean 3D wave activity fluxes immediately downstream of SFZ with strong horizontal flux vectors emanating northeast from this region. Similar patterns across composites of Polar Front and Subantarctic Front meander intrusions suggest the dynamics are set more so by the presence of the SFZ than by the eddys sign. A case study showing the evolution of a single eddy event, from 15 to 23 July 2010, highlights the storm-track dynamics in a series of snapshots. Consistently, explaining the eddy energetics pattern requires both horizontal and vertical components of W, implying the importance of barotropic and baroclinic processes and instabilities in controlling storm-track dynamics in Drake Passage. Article in Journal/Newspaper Antarc* Antarctic Drake Passage eCite UTAS (University of Tasmania) Antarctic The Antarctic Drake Passage Shackleton Shackleton Fracture Zone ENVELOPE(-60.000,-60.000,-60.000,-60.000) Journal of Physical Oceanography 49 3 867 884 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical oceanography |
spellingShingle |
Earth Sciences Oceanography Physical oceanography Foppert, A Observed storm track dynamics in Drake Passage |
topic_facet |
Earth Sciences Oceanography Physical oceanography |
description |
The dynamics of an oceanic storm trackwhere energy and enstrophy transfer between the mean flow and eddiesare investigated using observations from an eddy-rich region of the Antarctic Circumpolar Current downstream of the Shackleton Fracture Zone (SFZ) in Drake Passage. Four years of measurements by an array of current- and pressure-recording inverted echo sounders deployed between November 2007 and November 2011 are used to diagnose eddymean flow interactions and provide insight into physical mechanisms for these transfers. Averaged within the upper to mid-water column (4001000-m depth) and over the 4-yr-record mean field, eddy potential energy is highest in the western part of the storm track and maximum eddy kinetic energy occurs farther away from the SFZ, shifting the proportion of eddy energies from to about 1 along the storm track. There are enhanced mean 3D wave activity fluxes immediately downstream of SFZ with strong horizontal flux vectors emanating northeast from this region. Similar patterns across composites of Polar Front and Subantarctic Front meander intrusions suggest the dynamics are set more so by the presence of the SFZ than by the eddys sign. A case study showing the evolution of a single eddy event, from 15 to 23 July 2010, highlights the storm-track dynamics in a series of snapshots. Consistently, explaining the eddy energetics pattern requires both horizontal and vertical components of W, implying the importance of barotropic and baroclinic processes and instabilities in controlling storm-track dynamics in Drake Passage. |
format |
Article in Journal/Newspaper |
author |
Foppert, A |
author_facet |
Foppert, A |
author_sort |
Foppert, A |
title |
Observed storm track dynamics in Drake Passage |
title_short |
Observed storm track dynamics in Drake Passage |
title_full |
Observed storm track dynamics in Drake Passage |
title_fullStr |
Observed storm track dynamics in Drake Passage |
title_full_unstemmed |
Observed storm track dynamics in Drake Passage |
title_sort |
observed storm track dynamics in drake passage |
publisher |
Amer Meteorological Soc |
publishDate |
2019 |
url |
https://doi.org/10.1175/JPO-D-18-0150.1 http://ecite.utas.edu.au/140517 |
long_lat |
ENVELOPE(-60.000,-60.000,-60.000,-60.000) |
geographic |
Antarctic The Antarctic Drake Passage Shackleton Shackleton Fracture Zone |
geographic_facet |
Antarctic The Antarctic Drake Passage Shackleton Shackleton Fracture Zone |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_relation |
http://dx.doi.org/10.1175/JPO-D-18-0150.1 Foppert, A, Observed storm track dynamics in Drake Passage, Journal of Physical Oceanography, 49, (3) pp. 867-884. ISSN 0022-3670 (2019) [Refereed Article] http://ecite.utas.edu.au/140517 |
op_doi |
https://doi.org/10.1175/JPO-D-18-0150.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
49 |
container_issue |
3 |
container_start_page |
867 |
op_container_end_page |
884 |
_version_ |
1766171156260323328 |