CDEX (1) carried out some site surveys for operational purposes for IODP (2) campaigns separately from those conducted by proponents of drilling proposals. Long-term ocean current monitoring using subsurface mooring systems is one of the site surveys, obtaining ocean current data to assess the impacts of those on the drilling operations. The mooring system consists of a long ranger multi-current ADCP (3) at the top buoy, which is designed to locate at 300-500m below sea level, single-point doppler current meters and CTDs (4) aligned below the top buoy, a pair of acoustic releasers, and an anchor at the sea bottom. Here, long-term ocean current directions and velocities, temperatures, and conductivities obtained by the mooring systems near the IODP drilling sites or proposed drilling sites are available. (1) Center for Deep Earth Exploration (2002~2019), the previous IODP Implementation Organization of Japan operating D/V Chikyu. (2) Integrated Ocean Drilling Program (2003~2013) or International Ocean Discovery Program (2013~2024) (3) Acoustic Doppler Current Profiler (4) Conductivity Temperature Depth profiler.

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JAMSTEC

2022-11-24