Ocean Carbonate System Measurements from a Moored Buoy near Honolulu, Hawaii

A seven-month time series of dissolved inorganic carbon, pH, temperature, and salinity collected from a moored buoy near the coast of Honolulu, Hawaii. The dataset was created by the National Oceanic and Atmospheric Administration to evaluate a prototype autonomous DIC sensor, with performance validated against 51 discrete bottle samples and a collocated CO2 buoy.

Use Cases

• Evaluating the accuracy of autonomous dissolved inorganic carbon sensors based on direct measurement versus pH/CO2 estimates.
• Analyzing temporal variability in coastal carbonate system parameters based on the seven-month time series.
• Modeling ocean acidification dynamics in a coastal North Pacific environment based on concurrent DIC, pH, and CO2 measurements.
• Calibrating and validating other oceanographic sensors based on the over-constrained carbonate system measurements from the buoy array.

Strengths

• Laboratory-determined sensor uncertainty of ±5 µmol kg-1 for dissolved inorganic carbon.
• Performance validated against 51 discrete bottle samples analyzed via coulometry.
• Data collection over-constrained by deployment ~25m from an existing CO2 buoy.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Oceanic and Atmospheric Administration, Department of Commerce

Collection Method

Data collected from a moored buoy using a prototype MADIC System, Sunburst SAMI2 pH sensor, and a Sea-Bird Electronics CTD.

Time Range

Seven-month deployment (specific start date provided as '20' in title).

Freshness

Last updated 2026-03-05 22:50:48.450872; freshness should be verified.

Geography

Kewalo Buoy near the coast of Honolulu, Hawaii, North Pacific Ocean.