This record is derived from DEC Marine Policy Branch Endnote library and spatially referenced SIER Database.

This record is derived from DEC Marine Policy Branch Endnote library and spatially referenced SIER Database.

This record is derived from DEC Marine Policy Branch Endnote library and spatially referenced SIER Database.

This record is derived from DEC Marine Policy Branch Endnote library and spatially referenced SIER Database.

This record is derived from DEC Marine Policy Branch Endnote library and spatially referenced SIER Database.

Observations of the Leeuwin Current, the poleward flow of warm, low salinity water off the west coast of Australia, are described from acoustic Doppler current profiler (ADCP), temperature and salinity (CTD) and moored current meter measurements from the Australian North West Shelf made in May and June 1993. Two cross-shelf and slope transects of ADCP and CTD measurements were completed at latitudes of approximately 17 and 19S.

From 2007 to 2011, a field measurement program, a numerical circulation model development program, and a laboratory program will provide a comprehensive understanding and predictive capability of the tidal motions and tidally driven internal wave climatology on the North West Shelf of Western Australia. This will encompass the generation, propagation and dissipation of internal waves and their effects on the marine environment. This precise understanding of the local ocean environment will link with issues of loading on structures, seabed stability and bottom erosion, and hence engineering design criteria for the design and operation of pipelines and offshore structures.

This record is derived from DEC Marine Policy Branch Endnote library and spatially referenced SIER Database.

The East Australian Current (EAC) onshore encroachment drives coastal upwelling and shelf circulations, changes slope-shelf bio-physical dynamics, and consequently exerts significant influence on coastal marine ecosystem along the south-eastern Australian margin. The EAC is a highly dynamic eddy-current system which exhibits high-frequency intrinsic fluctuations and eddy shedding. As a result, low-frequency variability in the EAC is usually overshadowed and rarely detectable. For decades, despite many efforts into the ocean current observations, the seasonality of EAC’s shoreward intrusion remains highly disputable. In this study, for the first time we use a long-term (26 years) remotely sensed AVHRR Sea Surface Temperature (SST) dataset spanning 1992-2018 to map the EAC off the coast of northern New South Wales (NSW), between 28°S - 32.5°S. A Topographic Position Index (TPI) image processing technique was applied to conduct the quantitative mapping. The mapping products have enabled direct measurement (area and distance) of the EAC’s shoreward intrusion. Subsequent spatial and temporal analyses have shown that the EAC move closer to the coast in austral summer and autumn than in austral winter, with the mean distance-to-coast ~6 km shorter and occupying the shelf area ~12% larger. This provides quantitative and direct evidence of the seasonality of the EAC’s shoreward intrusion. Such seasonal migration pattern of the EAC thus provides new insights into the seasonal upwelling and shelf circulations previously observed in this region. As a result, we were able to confirm that the EAC is a driving force of the seasonal ocean dynamics for the northern NSW coast.