Observed storm track dynamics in Drake Passage
The dynamics of an oceanic storm track—where energy and enstrophy transfer between the mean flow and eddies—are 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...
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ftunivtasmania:oai:eprints.utas.edu.au:34637 2023-05-15T13:42:39+02:00 Observed storm track dynamics in Drake Passage Foppert, A 2019 https://eprints.utas.edu.au/34637/ unknown Amer Meteorological Soc Foppert, A orcid:0000-0003-2958-1454 2019 , 'Observed storm track dynamics in Drake Passage' , Journal of Physical Oceanography, vol. 49, no. 3 , 867–884 , doi:10.1175/JPO-D-18-0150.1 <http://dx.doi.org/10.1175/JPO-D-18-0150.1>. Southern Ocean currents eddies cyclogenesis energy transfer Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.1175/JPO-D-18-0150.1 2021-10-04T22:18:44Z The dynamics of an oceanic storm track—where energy and enstrophy transfer between the mean flow and eddies—are 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 eddy–mean flow interactions and provide insight into physical mechanisms for these transfers. Averaged within the upper to mid-water column (400–1000-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 eddy’s 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 Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean 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 |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
Southern Ocean currents eddies cyclogenesis energy transfer |
spellingShingle |
Southern Ocean currents eddies cyclogenesis energy transfer Foppert, A Observed storm track dynamics in Drake Passage |
topic_facet |
Southern Ocean currents eddies cyclogenesis energy transfer |
description |
The dynamics of an oceanic storm track—where energy and enstrophy transfer between the mean flow and eddies—are 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 eddy–mean flow interactions and provide insight into physical mechanisms for these transfers. Averaged within the upper to mid-water column (400–1000-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 eddy’s 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://eprints.utas.edu.au/34637/ |
long_lat |
ENVELOPE(-60.000,-60.000,-60.000,-60.000) |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage Shackleton Shackleton Fracture Zone |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage Shackleton Shackleton Fracture Zone |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
Foppert, A orcid:0000-0003-2958-1454 2019 , 'Observed storm track dynamics in Drake Passage' , Journal of Physical Oceanography, vol. 49, no. 3 , 867–884 , doi:10.1175/JPO-D-18-0150.1 <http://dx.doi.org/10.1175/JPO-D-18-0150.1>. |
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_ |
1766170456112496640 |