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An avenue of eddies: quantifying the biophysical properties of mesoscale eddies in the Tasman Sea

Citation

Everett, JD and Baird, ME and Oke, PR and Suthers, IM, An avenue of eddies: quantifying the biophysical properties of mesoscale eddies in the Tasman Sea, Geophysical Research Letters, 39, (16) Article L16608. ISSN 0094-8276 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 American Geophysical Union

DOI: doi:10.1029/2012GL053091

Abstract

[1] The Tasman Sea is unique - characterised by a strong seasonal western boundary current that breaks down into a complicated field of mesoscale eddies almost immediately after separating from the coast. Through a 16-year analysis of Tasman Sea eddies, we identify a region along the southeast Australian coast which we name ‘Eddy Avenue’ where eddies have higher sea level anomalies, faster rotation and greater sea surface temperature and chlorophylla anomalies. The density of cyclonic and anticyclonic eddies within Eddy Avenue is 23% and 16% higher respectively than the broader Tasman Sea. We find that Eddy Avenue cyclonic and anticyclonic eddies have more strongly differentiated biological properties than those of the broader Tasman Sea, as a result of larger anticyclonic eddies formed from Coral Sea water depressing chl. aconcentrations, and for coastal cyclonic eddies due to the entrainment of nutrient-rich shelf waters. Cyclonic eddies within Eddy Avenue have almost double the chlorophylla (0.35 mg m−3) of anticyclonic eddies (0.18 mg m−3). The average chlorophyll a concentration for cyclonic eddies is 16% higher in Eddy Avenue and 28% lower for anticyclonic eddies when compared to the Tasman Sea. With a strengthening East Australian Current, the propagation of these eddies will have significant implications for heat transport and the entrainment and connectivity of plankton and larval fish populations.

Item Details

Item Type:Refereed Article
Keywords:anticyclonic eddies, biological properties, biophysical properties, Chlorophyll a, Coral sea, cyclonic eddy, heat transport, larval fishes, mesoscale eddy, sea level anomaly, sea surface temperature (SST), western boundary currents
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Oceanic processes (excl. in the Antarctic and Southern Ocean)
UTAS Author:Oke, PR (Dr Peter Oke)
ID Code:118982
Year Published:2012
Web of Science® Times Cited:98
Deposited By:Oceans and Cryosphere
Deposited On:2017-07-25
Last Modified:2017-08-03
Downloads:109 View Download Statistics

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