+--------------------------------------------------------------------------+ | OCEANUS CRUISE SYNOPSIS | +--------------------------------------------------------------------------+ Voyage - Leg: OC 415-4 Voyage Dates: 29 Aug - 15 Sep 2005 Chief Sci(s): Jim Ledwell (McGillicuddy) Address: WHOI Bigelow 103 MS# 12 Phone: 508-289-3305 Email: jledwell@whoi.edu Cruise Objective: TRACER 2 - Tracer sampling with towed system, drifter servicing and recovery, float deployments, glider deployments, CTD/Rosette casts. Science Activities: CTD/Rosette Casts (Ledwell et al.) XBT ADCP tracking (Ledwell) Tracer sampling* - towed sled from A-frame (Ledwell) Tracking drogue deployments and recoveries (Ledwell) Sea Horse deployment and recovery (Greenan, BIO) APEX/EM profiling float deployments and recoveries (Girton, UW) Glider deployments and recoveries (Schofield, Rutgers)) Operations Area: Sargasso Sea SSSG Tech: Patrick Rowe - sssg @oceanus.whoi.edu Departure Port: St. Georges, BERMUDA Agent: Meyer Shipping Somers Wharf 14 Water St. St. Georges, GE BX BERMUDA Contact: Capt. John Moore tel. (441) 297-2303 fax: (441) 292-1583 email: meyershipping@ibl.bm Arrival Port: Woods Hole, MA Agent: WHOI 266 Woods Hole Rd. Woods Hole, MA 02543 Contact: John Dyke tel. (508) 289-3770 fax: (508) 457-2185 email: jdyke@whoi.edu Installed Scientific ADCP Equipment: XBT System Deionized Water CTD/Rosette System WHOI-Provided Science UNOLS General Purpose Van Tools: Berthing Van ARGOS RDF Program-Provided Sampling Sled - 500 lbs. Science Tools: Shipboard GPS Nav Equipment/Nav: 4 conductor slip rings Other Requirements: Night Work Anticipated Auto winch control, Sampling system Notes: All hazardous materials will be removed at the end of this cruise. List of gear required for operations: Automatic winch control circuitry Primary CTD winch Secondary CTD winch Wide-mouthed block on starboard boom for secondary wire Wide-mouthed block on A-Frame for secondary wire Crane (2) Air tuggers A-Frame *Note that automatic winch control is crucial for the injection and sampling tows. Cruise Plan (Rough) Days 1-3 Transit, Site survey with XBT and CTD Days 4-14 Tracer sampling tows; ancillary projects over the side Days 15-17 Transit to Woods Hole Sampling tows are done overnight and require about 14 hours of wire time. Ancillary projects will be done during the day between tows with the CTD/Rosette over the stern. Details: CTD/Rosette casts will be done from the stern during most days; sampling tows at night. XBT profiles will be done during the first three days of the cruise to help locate the tracer patch. ADCP. The ADCP record velocities will be integrated in real time to help keep track of patch. Shears from the ADCP will be used to interpret the observations. The ADCP is therefore crucial to this cruise. Tracer sampling (Ledwell group). Sampling tows will be done from the A-frame to give us flexibility in direction of tow. Therefore, the CTD cable and the secondary cable must be led aft to the A-frame. The lower part of the sampling array is supported by a 50-meter non conducting cable with a 500-pound weight at the bottom. Deployment goes as follows: The weight and cable are deployed over the stern with the secondary winch, wire and sheaves. Ten or eleven 5-liter Niskin bottles, with integrating samplers attached, and two temperature pods are hung on the wire as it is deployed. The top of the secondary cable is coupled to a pendant attached to the sampling sled, which houses a CTD, rosette pylon, and a 50-chamber sampling system. The sampling sled is then lifted with the main CTD cable and lowered into the water. This sled is not neutrally buoyant; it becomes a link between the two cables. As the CTD cable is paid out, ten or eleven more 5-liter Niskin bottles with integrating samplers and two more temperature pods are hung on it. The array is lowered to the same density surface as used for the injection, at about 80 meters depth, and is maintained on that density surface with automatic control of the winch using feedback from the CTD. The array of samplers is tripped by mechanical messenger. The array is towed for ten hours at 1.5 to 2 knots across the suspected location of the tracer patch. The plan is to deploy this system in the evening and recover it in the morning. The CTD cable will be transferred to the CTD/Rosette for day time casts each day, and transferred back each evening. Drogues (Ledwell, Brian Guest). The four ARGOS-tracked drifters, with holey-sock drogues set at the approximate depth of the tracer patch, may be recovered during the injection to help track the tracer. Sea Horse Float (Blair Greenan, BIO). The Sea Horse consists of a float with a 200-meter wire and weight suspended from it. An instrument package crawls down the wire, driven by wave action, and then freely rides up the wire while measuring conductivity, temperature, presuure, and velocity. This instrument will be deployed with the crane. The float is 5-feet in diameter and weighs about 1600 pounds. The Sea Horse will be recovered at least once, and most likely will be redeployed near the end of the cruise. A document describing deployment and recovery is available. APEX/EM floats (James Girton and Tom Sanford, U. W.). These are floats that profile to 200 meters while measuring CTD and velocity. They can be deployed by hand. They may be recovered during the cruise. Gliders (Oscar Schofield, Rutgers). Deployment / Recovery of the glider of Oscar Schofield is best done from a small boat, i.e., zodiac Water Sampling - Jingfeng - We only sample with a pole (for surface water and it requires ship to steam at ~5 knots during 10 min sampling time when the ship starts and slows down around the station) and with automatic sampler which will be attached directly on the hydrowire (we need to attach two clamps on the wire to fix each sampler at certain part of the wire although the sampler itself is neutral buoyant). Navy Clearance Status: Last Modified: 12/13/2006 Check List: Required? Comments US Customs Form Yes Explosives Clearance No Isotope Use Approval No Diplomatic Clearance Yes Bermuda SCUBA Diving No