Wind Forced Variability in Eddy Formation, Eddy Shedding, and the Separation of the East Australian Current
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Bull, Christopher; Kiss, Andrew; Jourdain, Nicolas; England, Matthew; van Sebille, Erik
Description
The East Australian Current (EAC), like many other subtropical western boundary currents, is believed to be penetrating further poleward in recent decades. Previous observational and model studies have used steady state dynamics to relate changes in the westerly winds to changes in the separation behavior of the EAC. As yet, little work has been undertaken on the impact of forcing variability on the EAC and Tasman Sea circulation. Here using an eddy‐permitting regional ocean model, we present a...[Show more]
dc.contributor.author | Bull, Christopher | |
---|---|---|
dc.contributor.author | Kiss, Andrew | |
dc.contributor.author | Jourdain, Nicolas | |
dc.contributor.author | England, Matthew | |
dc.contributor.author | van Sebille, Erik | |
dc.date.accessioned | 2019-04-15T04:42:56Z | |
dc.date.available | 2019-04-15T04:42:56Z | |
dc.identifier.issn | 2169-9291 | |
dc.identifier.uri | http://hdl.handle.net/1885/159638 | |
dc.description.abstract | The East Australian Current (EAC), like many other subtropical western boundary currents, is believed to be penetrating further poleward in recent decades. Previous observational and model studies have used steady state dynamics to relate changes in the westerly winds to changes in the separation behavior of the EAC. As yet, little work has been undertaken on the impact of forcing variability on the EAC and Tasman Sea circulation. Here using an eddy‐permitting regional ocean model, we present a suite of simulations forced by the same time‐mean fields, but with different atmospheric and remote ocean variability. These eddy‐permitting results demonstrate the nonlinear response of the EAC to variable, nonstationary inhomogeneous forcing. These simulations show an EAC with high intrinsic variability and stochastic eddy shedding. We show that wind stress variability on time scales shorter than 56 days leads to increases in eddy shedding rates and southward eddy propagation, producing an increased transport and southward reach of the mean EAC extension. We adopt an energetics framework that shows the EAC extension changes to be coincident with an increase in offshore, upstream eddy variance (via increased barotropic instability) and increase in subsurface mean kinetic energy along the length of the EAC. The response of EAC separation to regional variable wind stress has important implications for both past and future climate change studies. | |
dc.description.sponsorship | This work was supported by an Australian Government Research Training Program Scholarship and the Australian Research Council (ARC), specifically, the ARC Centre of Excellence in Climate System Science (CE110001028) and grant DE130101336. This research was undertaken with the assistance of resources from the National Computational Infrastructure (NCI), which is supported by the Australian Government. We thank Eric C. J. Oliver for developing the eddy tracking code (Oliver et al., 2013, Appendix A); the GitHub fork used in this study is publicly available online (https:// github.com/chrisb13/eddyTracking). NJ is funded by the French National Research Agency through the TROISAS project (ANR-15-CE01-0005-01). | |
dc.format.extent | 19 pages | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | American Geophysical Union (AGU) | |
dc.rights | © 2017. American Geophysical Union. Not subject to U.S. copyright https://publications.agu.org/author-resource-center/usage-permissions/ (Publisher journal website as of 15/4/2019) | |
dc.source | Journal of Geophysical Research: Oceans | |
dc.subject | East Australian Current (EAC) | |
dc.subject | eddy‐permitting regional ocean model | |
dc.subject | climate | |
dc.title | Wind Forced Variability in Eddy Formation, Eddy Shedding, and the Separation of the East Australian Current | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 122 | |
dcterms.dateAccepted | 2017-11-15 | |
dc.date.issued | 2017-12-15 | |
local.identifier.absfor | 040503 - Physical Oceanography | |
local.identifier.ariespublication | u4485658xPUB1004 | |
local.publisher.url | https://sites.agu.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Bull, Christopher, University of New South Wales | |
local.contributor.affiliation | Kiss, Andrew, College of Science, The Australian National University | |
local.contributor.affiliation | Jourdain, Nicolas, University of New South Wales | |
local.contributor.affiliation | England, Matthew, University of New South Wales | |
local.contributor.affiliation | van Sebille, Erik, University of New South Wales | |
dc.relation | http://purl.org/au-research/grants/arc/CE110001028 | |
dc.relation | http://purl.org/au-research/grants/arc/DE130101336 | |
local.identifier.essn | 2169-9291 | |
local.bibliographicCitation.issue | 12 | |
local.bibliographicCitation.startpage | 9980 | |
local.bibliographicCitation.lastpage | 9998 | |
local.identifier.doi | 10.1002/2017JC013311 | |
local.identifier.absseo | 960304 - Climate Variability (excl. Social Impacts) | |
dc.date.updated | 2019-03-12T07:27:42Z | |
local.identifier.scopusID | 2-s2.0-85037984829 | |
local.identifier.thomsonID | 000422732100039 | |
dcterms.accessRights | Open Access | |
dc.provenance | http://sherpa.mimas.ac.uk/romeo/issn/2169-9291/ Author can archive publisher's version/PDF. Publisher's version/PDF may be used 6 months after publication on an Institutional Repository or Governmental Repository only (Sherpa/Romeo as of 15/4/2019) | |
Collections | ANU Research Publications |
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