Benthic Nutrient Flux Measurements in Port Phillip Bay, Australia, 1994-1995

Geoscience Australia Data provides benthic chamber measurements from Port Phillip Bay, Australia, quantifying solute exchange rates between sediment and overlying water. The dataset includes measurements of oxygen, ammonium, nitrate, nitrite, phosphate, silicate, TCO2, and alkalinity taken at various sites during the summers of 1994 and 1995. It distinguishes four bay regions and calculates that benthic recycling accounted for 63% and 72% of annualized nitrogen and phosphorus inputs, respectively.

Use Cases

• Modeling coastal nutrient budgets based on benthic recycling rates for nitrogen and phosphorus.
• Comparing regional sediment properties and their influence on nutrient regeneration rates within a bay.
• Studying denitrification efficiency in coastal sediments relative to carbon loading.
• Investigating bio-irrigation rates using radon-222 and CsCl spike injection measurements.
• Assessing the spatial variability of non-diffusive pore-water solute exchange in a coastal ecosystem.

Strengths

• Defines solute exchange rates for eight key reactants and products (oxygen, ammonium, nitrate, nitrite, phosphate, silicate, TCO2, alkalinity).
• Quantifies benthic recycling contributions as 63% of annualized N input and 72% of annualized P input to the entire bay.
• Identifies a northern region with nutrient regeneration rates 3-30 times greater than other regions.
• Compares year-to-year variability (±50%) with within-site variability.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and temporal bias inherent to data_gov_au, focusing on two summers in one bay.

Provenance

Source

Geoscience Australia Data

Collection Method

Benthic chamber measurements and radon-222/CsCl spike injection chamber measurements.

Time Range

Summers of 1994 and 1995

Freshness

Last updated 2026-05-14 03:41:08.732846; freshness should be verified.

Geography

Port Phillip Bay, Australia