Groundwater Seawater Mixing Zone Hydrochemistry from Nauru Island

Hydrochemical data describes the evolution of freshwater to seawater across a brackish mixing zone in Nauru Island's karstified dolomitic limestone aquifer. The dataset, provided by the Australian Ocean Data Network, was last updated in April 2026. It details saturation indices for carbonate minerals like dolomite, calcite, and aragonite across a salinity gradient.

Use Cases

• Modeling dolomitization potential using saturation indices for dolomite across total dissolved solids concentrations.
• Analyzing chemical evolution trends in groundwater by tracking changes in HCO3-Ca-Mg composition with increasing salinity.
• Distinguishing open and closed system groundwater behavior based on partial pressure of CO2 measurements.
• Calibrating seawater intrusion models using salinity profiles extending to 70 meters below sea level.

Strengths

• Data includes specific saturation thresholds for key carbonate minerals (e.g., dolomite at 300 mg/L TDS).
• Describes a detailed hydrochemical profile from freshwater through a brackish mixing zone to seawater.

Limitations

• Sample size, row count, and specific measurement locations are unknown.
• Data is presented in PDF/HTML formats, limiting direct machine readability and analysis.

Provenance

Source

Australian Ocean Data Network

Collection Method

Field measurements and laboratory analysis of groundwater samples.

Freshness

Updated in April 2026.

Geography

Nauru Island, central Pacific Ocean.