OISO-25 Cruise: Sea Surface Carbon and Hydrography in the Indian Ocean

Surface measurements of dissolved inorganic carbon, total alkalinity, temperature, and salinity were collected during the R/V Marion-Dufresne OISO-25 cruise from January 7 to 26, 2016. The data are part of the OISO program, initiated in 1998, which collects repeated observations in the South-Western Indian and Southern Oceans to complement the international CO2 observing system. These measurements are regularly included in international syntheses like SOCAT and GLODAP.

Use Cases

• Calibrating ocean carbon models based on direct measurements of DIC and total alkalinity.
• Assessing ocean acidification trends in the Indian Ocean using time-series cruise data.
• Validating satellite-derived sea surface salinity and temperature products with in-situ measurements.
• Contributing data to international synthesis efforts like SOCAT and GLODAP for global carbon budget calculations.

Strengths

• Data is part of a long-term monitoring program (OISO) initiated in 1998, providing context for time-series analysis.
• Includes key parameters for ocean carbon cycle studies (DIC, TALK, temperature, salinity) as part of an international observing system (IOCCP).
• Cross-platform presence on NASA EarthData and Data.gov signals importance and facilitates broader access.

Limitations

• Critical metadata is missing, including row count, specific column names, file size, and license information.
• Conflicting 'last updated' dates exist between sources (2016-01-26 vs. 2026-03-05), creating uncertainty about data currency.
• The dataset's scope is limited to a single, 20-day cruise, requiring combination with other cruises for long-term spatial analysis.

Provenance

Source

NOAA National Centers for Environmental Information (NCEI)

Collection Method

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

Time Range

2016-01-07 to 2016-01-26

Freshness

2026-03-05 23:45:47.895859

Geography

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