East Australian Current Sea Surface Temperature Maps from Himawari-8 Satellite

Himawari-8 satellite data provides sea surface temperature imagery at very high spatiotemporal resolution. Researchers from the Australian Ocean Data Network used this data to map the spatial structure and temporal evolution of the East Australian Current from July 2015 to September 2017. The analysis employed a Topographic Position Index method to capture the current's complex dynamics.

Use Cases

• Analyze the 65-100 day eddy-shedding timescale of the East Australian Current using temporal wavelet analysis on SST time series.
• Map the spatial variability of EAC meanders, offshoots, and eddies using the Topographic Position Index (TPI) method applied to SST images.
• Investigate seasonal cycles in EAC coastal proximity by comparing austral summer and winter SST signatures over the 26-month study period.
• Relate SST signatures to surface current speed by calculating the ~60% area ratio of overlap between satellite data and numerical ocean model outputs.
• Document powerful summer pulses of EAC encroachment off the eastern coast of Tasmania using the high-resolution SST time series.

Strengths

• Time series covers a 26-month period from July 2015 to September 2017.
• Analysis uses very high spatiotemporal resolution imagery from the Himawari-8 satellite.
• Methodology validated by relating SST signatures to an eddy-resolving numerical ocean model.

Limitations

• Dataset size, row count, and specific file formats are not provided in the source description.
• Data is temporally limited to a specific 2-year study period and may not represent long-term trends.
• Primary output appears to be analytical results and maps, not the raw satellite data files.

Provenance

Source

Australian Ocean Data Network, based on Himawari-8 satellite data and analysis published in the Journal of Geophysical Research: Oceans.

Collection Method

Satellite remote sensing using Himawari-8 sea surface temperature data, analyzed with a Topographic Position Index (TPI) method.

Time Range

July 2015 to September 2017

Freshness

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Geography

Southeast coast of Australia, including the East Australian Current path and the eastern coast of Tasmania.