OISO-18 Cruise: Surface Ocean Carbon and Hydrography in the Indian Ocean

Surface underway measurements of dissolved inorganic carbon, total alkalinity, temperature, and salinity were collected during the R/V Marion-Dufresne OISO-18 cruise in the Indian Ocean from December 19, 2009, to January 22, 2010. This dataset is part of the long-term OISO program, initiated in 1998, which monitors carbon dioxide and associated parameters along repeated transects in the South-Western Indian and Southern Oceans. The data contribute to international synthesis projects like the Surface Ocean CO2 Atlas (SOCAT) and the Global Ocean Data Analysis Project (GLODAP).

Use Cases

• Calibrating and validating ocean carbon models based on direct measurements of dissolved inorganic carbon and total alkalinity.
• Assessing ocean acidification trends in the Indian Ocean using time-series data from a repeated monitoring line.
• Studying air-sea CO2 flux dynamics using parameters that inform the calculation of partial pressure of carbon dioxide (pCO2).
• Integrating cruise data into global carbon atlases (e.g., SOCAT, GLODAP) for large-scale biogeochemical analysis.

Strengths

• Data is part of a long-term monitoring program (OISO) initiated in 1998, providing context for time-series analysis.
• Measurements are integrated into major international synthesis projects (SOCAT, GLODAP), indicating quality and interoperability.
• Covers a specific, well-documented cruise (EXPOCODE 35MV20091219) with a precise time range (2009-12-19 to 2010-01-22).

Limitations

• Column names and data structure are not specified in the provided metadata, limiting immediate usability.
• Conflicting 'last updated' dates (2010-01-22 vs. 2026-03-05) create uncertainty about metadata maintenance.
• Key metadata such as row count, file size, and specific license are unavailable.

Provenance

Source

National Oceanic and Atmospheric Administration (NOAA), Department of Commerce, via the OISO (Ocean Indien Service d'Observations) program.

Collection Method

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

Time Range

2009-12-19 to 2010-01-22

Freshness

Last updated date conflicts: one source lists 2010-01-22, another lists 2026-03-05.

Geography

Indian Ocean, specifically along the repeated lines of the R.V. Marion-Dufresne in the South-Western Indian and Southern Oceans.