Australian Coastal Water Quality Measurements from Reference Stations

IMOS National Reference Station data provides measurements of Total Suspended Solids and Secchi Depth from nine coastal sites around Australia. Sampling began between 2008 and 2010 and is ongoing at seven sites, with historical data available for some locations dating back to 1944. The dataset is collected by the Integrated Marine Observing Systems (IMOS) Biogeochemical project team.

Use Cases

• Analyze temporal trends in Secchi Depth measurements to assess long-term changes in water clarity at specific stations like Maria Island or Port Hacking.
• Model relationships between Total Suspended Solids (inorganic and organic) and other environmental variables using the monthly time-series data.
• Compare water quality parameters like Secchi Depth across the nine distinct geographic sites, from Darwin to Kangaroo Island.
• Investigate the impact of sampling cessation in 2013 on data continuity for the Ningaloo and Esperance station records.

Strengths

• Long-term monitoring with ongoing data collection at 7 sites and historical records extending back to 1944 for 3 locations.
• Geographic coverage includes 9 distinct coastal reference stations around Australia's coastline.
• Standardized collection following the documented 'IMOS National Reference Stations Biogeochemical Operations Manual'.

Limitations

• Sampling frequency is monthly (or was 3-monthly for some sites), which may miss short-term episodic events.
• Data collection ceased at two Western Australian sites (Ningaloo and Esperance) in 2013, creating incomplete time series.
• The dataset has been superseded by a combined collection, indicating it may not be the most current version.

Provenance

Source

Integrated Marine Observing Systems (IMOS) National Mooring Network, Australian Ocean Data Network.

Collection Method

Monthly field sampling from small vessels, with analyses performed on collected water samples.

Time Range

Sampling began 2008-2010 and is ongoing; includes historical data from 1944 for some sites.

Freshness

Ongoing monthly sampling at 7 sites; dataset last updated in catalog on 2026-04-04 but is superseded.

Geography

Nine coastal reference stations around Australia: Maria Island (TAS), Kangaroo Island (SA), Esperance (WA), Rottnest Island (WA), Ningaloo (WA), Darwin (NT), Yongala (QLD), North Stradbroke Island (QLD), Port Hacking (NSW).