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Observed and simulated Lagrangian and eddy characteristics of the East Australian Current and the Tasman Sea |
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| Authors: | Gary B Brassington Nicholas SummonsRick Lumpkin |
| Institution: | a Centre for Australian Weather and Climate Research, Bureau of Meteorology, PO Box 1289K, Melbourne, Australia b University of Melbourne, Australia c AOML, National Oceanographic and Atmospheric Administration, Miami, Florida, USA |
| Abstract: | New insights into the Lagrangian and eddy dynamical processes within the East Australian Current (EAC) and the Tasman Sea are presented. We briefly discuss the past campaigns undertaken to observe the EAC and the Tasman Sea eddies as well as the motivation to renew the deployment of drifting buoys into the EAC and the Tasman Sea. The specific features discussed are motivated by the recent observing campaigns using drifting buoys and the availability of high spatial- and temporal-resolution estimates of the ocean state and circulation from eddy resolving models. The interpretation of these features is also aided by other components of the ocean observing system. The dynamics presented includes: (a) transient EAC separation through a vortex dipole, (b) stratified vortex mergers and secondary circulation of EAC eddies, (c) eddy networks in the Tasman Sea and (d) formation and propagation of the EAC separation point. The importance of these dynamical features to the EAC and the Tasman Sea and their implications for the observing system and modelling are discussed. |
| Keywords: | Lagrangian drifting buoys Western boundary currents Mesoscale eddies The Tasman Sea The East Australian Current |
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