INSTRUMENTATION

All hydrographic stations will consist of full depth casts of a combined CTDO2/LADCP package, with 24 sample bottles for salinity and oxygen calibration, plus an altimeter to find range off bottom. Oxygen data is necessary to measure the low oxygen signal of RSW, and help clarify the relationship of water mass distribution to the structure of the velocity and PV fields. CTDO2 work will be carried out by the Ocean Data Facility (ODF) here at Scripps Institution of Oceanography.

The CTD will be an ODF-modified NBIS MkIIIb CTD system with dual temperature sensors and the new (during WOCE) ODF dissolved oxygen sensor interface. ODF will provide a 24-place rosette system with low-contamination Niskin-like sample bottles, capable of supporting our LADCP.

The LADCP will be Chereskin's RDI, 150kHz broadband instrument. The cabling and external power supply is compatible with intruments from UH (Hacker/Firing), AOML (Wilson), and WHOI (Pickart), and we plan to borrow one of those instruments for redundancy, as scheduling permits.

The mooring equipment, including current meters, flotation, acoustic releases and wire, and its deployment will be provided and carried out by Southampton Oceanography Centre (SOC) Mooring Team. The current meters are Aanderaa RCM 8's (may be updated to 9's) with temperature, speed, direction and pressure sensors. Each mooring will have an acoustic release as a recovery device. Deployment will be set up to ensure two year endurance. A mooring recovery cruise of three days duration is proposed for eighteen months to two years after the deployment.

In addition this project requires a ship equipped with (1) an RDI narrowband 150 kHz hull-mounted ADCP, (2) an Ashtech 3DF GPS attitude sensor (or equivalent), (3) a P-code GPS receiver.