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Cruise Info
| Cruise ID | NH1116 |
| Vessel | R/V NEW HORIZON |
| Abstract | Deep-ocean Assessment and Reporting of Tsunamis (DART) Service of Stations 46412 and 43412: The ship will transit to DART station 43412, located approximately 230 nautical miles southwest of Manzanillo, Mexico. Upon arrival at the station, the ship survey technician will perform a full depth CTD cast. Data is only required on the downcast, and the CTD can be lowered at maximum allowable speed. Required measurements are depth, salinity, and speed of sound. The survey tech will use the sound velocity data and the ship echosounder to calculate water depth. After the CTD cast, NOAA techs will attempt to contact the existing Bottom Pressure Recorder (BPR) and activate the acoustic release. This was attempted on May 22, 2011, with no success. If BPR release is successful, the ship deck crew and NOAA techs will recover the BPR and floats. The ship deck crew and NOAA techs will then deploy the buoy on a new mooring, then deploy the BPR. The ship will remain on station for six hours after the BPR has settled on the sea floor to ensure that the system is operating properly. When released from station 43412, the ship will transit approximately 1,230 nautical miles northwest to station 46412, which is located 170 nautical miles west of San Diego. NOAA techs will send a signal to the BPR acoustic release and will recover the BPR and floats when they surface. NOAA techs and the ship deck personnel will then bring the existing buoy on board and exchange it for a new buoy using the same mooring. Techs will deploy the new buoy, then deploy the new BPR. The ship will remain on station for six hours after the BPR has settled on the sea floor to ensure that the system is operating properly. During this time, the ship survey technician will perform a full depth CTD cast. Data is only required on the downcast, and the CTD can be lowered at maximum allowable speed. Required measurements are depth, salinity, and speed of sound. After being released from station 43412, the ship can transit to port. When the ship gets within 50 nautical miles of each station, the ship survey technician will activate the Acoustic Doppler Current Profiler and continue its operation until the work is done at the station and the ship is 50 nautical miles away from the station. A 75 kHz ADCP is required, though a 38 kHz ADCP is desired. The ship echosounder and transducer system shall be rated for a depth of at least 4,000 meters. The depth at station 43412 is 3,245m sand at 46412 is 3,717m. |
| Starting Port | San Diego, California, USA |
| Ending Port | San Diego, California, USA |
| Starting Date | 2011-11-30 |
| Ending Date | 2011-12-13 |
| Principal Investigator | Brewer, Michael J. |