OISO-27 Cruise: Sea Surface Carbon and Hydrographic Measurements

Surface measurements of dissolved inorganic carbon, total alkalinity, temperature, and salinity were collected during the R/V Marion-Dufresne OISO-27 cruise from 2017-01-05 to 2017-02-07 in the Indian Ocean. The data are part of the OISO program, initiated in 1998, which collects pCO2 and associated parameters along repeated lines in the South-Western Indian and Southern Oceans. These measurements contribute to the international CO2 observing system and are regularly included in synthesis products like SOCAT and GLODAP.

Use Cases

• Calibrating and validating ocean carbon cycle models based on direct measurements of DIC and alkalinity.
• Assessing rates of ocean acidification in the Indian Ocean using time-series data of carbonate system parameters.
• Studying air-sea CO2 flux dynamics using surface underway pCO2 measurements and associated hydrographic data.
• Contributing to international carbon data syntheses (e.g., SOCAT, GLODAP) for global climate assessments.

Strengths

• Data is part of a long-term monitoring program (OISO) initiated in 1998, providing context for time-series analysis.
• Measurements are regularly included in authoritative international synthesis products (SOCAT, GLODAP), indicating quality and utility.
• Dataset has a precise temporal coverage from 2017-01-05 to 2017-02-07 and a defined spatial coverage in the Indian Ocean.

Limitations

• Column names and the exact data structure are unknown, limiting immediate usability without further documentation.
• Conflicting 'last updated' dates (2026-03-05 on Data.gov vs. 2017-02-07 on NASA Earthdata) create uncertainty about metadata freshness.
• Key metadata such as row count, file size, and license are not provided on any platform.

Provenance

Source

National Oceanic and Atmospheric Administration, Department of Commerce (via NCEI accession).

Collection Method

Surface underway measurements collected during a dedicated research cruise (R/V Marion-Dufresne, EXPOCODE 35MV20170105).

Time Range

2017-01-05 to 2017-02-07

Freshness

2026-03-05 23:06:08.261710

Geography

Indian Ocean, specifically the South-Western Indian and Southern Oceans along repeated cruise lines.