Cyclonic entrainment of preconditioned shelf waters into a frontal eddy

Everett, JD; MacDonald, H; Baird, ME; Humphries, J; Roughan, M; Suthers, IM

Cyclonic entrainment of preconditioned shelf waters into a frontal eddy

Everett, JD

MacDonald, H Baird, ME

Humphries, J Roughan, M Suthers, IM

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Publication Type:: Journal Article
Citation:: Journal of Geophysical Research: Oceans, 2015, 120 (2), pp. 677 - 691
Issue Date:: 2015-01-01

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Field	Value	Language
dc.contributor.author	Everett, JD https://orcid.org/0000-0002-6681-8054	en_US
dc.contributor.author	MacDonald, H	en_US
dc.contributor.author	Baird, ME https://orcid.org/0000-0003-4955-2298	en_US
dc.contributor.author	Humphries, J	en_US
dc.contributor.author	Roughan, M	en_US
dc.contributor.author	Suthers, IM	en_US
dc.date.issued	2015-01-01	en_US
dc.identifier.citation	Journal of Geophysical Research: Oceans, 2015, 120 (2), pp. 677 - 691	en_US
dc.identifier.issn	2169-9275	en_US
dc.identifier.uri	http://hdl.handle.net/10453/33141
dc.description.abstract	© 2015. American Geophysical Union. All Rights Reserved. The volume transport of nutrient-rich continental shelf water into a cyclonic frontal eddy (entrainment) was examined from satellite observations, a Slocum glider and numerical simulation outputs. Within the frontal eddy, parcels of water with temperature/salinity signatures of the continental shelf (18-19°C and >35.5, respectively) were recorded. The distribution of patches of shelf water observed within the eddy was consistent with the spiral pattern shown within the numerical simulations. A numerical dye tracer experiment showed that the surface waters (≤50 m depth) of the frontal eddy are almost entirely (≥95%) shelf waters. Particle tracking experiments showed that water was drawn into the eddy from over 4°of latitude (30-34.5°S). Consistent with the glider observations, the modeled particles entrained into the eddy sunk relative to their initial position. Particles released south of 33°S, where the waters are cooler and denser, sunk 34 m deeper than their release position. Distance to the shelf was a critical factor in determining the volume of shelf water entrained into the eddy. Entrainment reduced to 0.23 Sv when the eddy was furthest from the shelf, compared to 0.61 Sv when the eddy was within 10 km of the shelf. From a biological perspective, quantifying the entrainment of shelf water into frontal eddies is important, as it is thought to play a significant role in providing an offshore nursery habitat for coastally spawned larval fish.	en_US
dc.relation.ispartof	Journal of Geophysical Research: Oceans	en_US
dc.relation.isbasedon	10.1002/2014JC010301	en_US
dc.title	Cyclonic entrainment of preconditioned shelf waters into a frontal eddy	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	120	en_US
utslib.for	0404 Geophysics	en_US
utslib.for	0405 Oceanography	en_US
utslib.for	0406 Physical Geography and Environmental Geoscience	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	120	en_US

Abstract:

© 2015. American Geophysical Union. All Rights Reserved. The volume transport of nutrient-rich continental shelf water into a cyclonic frontal eddy (entrainment) was examined from satellite observations, a Slocum glider and numerical simulation outputs. Within the frontal eddy, parcels of water with temperature/salinity signatures of the continental shelf (18-19°C and >35.5, respectively) were recorded. The distribution of patches of shelf water observed within the eddy was consistent with the spiral pattern shown within the numerical simulations. A numerical dye tracer experiment showed that the surface waters (≤50 m depth) of the frontal eddy are almost entirely (≥95%) shelf waters. Particle tracking experiments showed that water was drawn into the eddy from over 4°of latitude (30-34.5°S). Consistent with the glider observations, the modeled particles entrained into the eddy sunk relative to their initial position. Particles released south of 33°S, where the waters are cooler and denser, sunk 34 m deeper than their release position. Distance to the shelf was a critical factor in determining the volume of shelf water entrained into the eddy. Entrainment reduced to 0.23 Sv when the eddy was furthest from the shelf, compared to 0.61 Sv when the eddy was within 10 km of the shelf. From a biological perspective, quantifying the entrainment of shelf water into frontal eddies is important, as it is thought to play a significant role in providing an offshore nursery habitat for coastally spawned larval fish.

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http://hdl.handle.net/10453/33141