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RRS Discovery D111A
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Discovery (74E3) |
Cruise identifier | D111A |
Cruise period | 1980-06-21 — 1980-07-03 |
Status | Completed |
Port of departure | Balboa, Panama |
Port of return | Halifax, Canada |
Purpose | Research |
Objectives | The first leg of Discovery Cruise 111 was to have been primarily a transit leg from Balboa Panama to Halifax, Nova Scotia with little time allowed for underway geophysical profiling. However, the previous December the charter ship RV Starella, on passage from Jacksonville, Florida to San Juan, Puerto Rico had obtained a GLORIA survey track over the Bahama Outer Ridge. The large scale sedimentary bedforms observed on the resulting sonographs were impressive. Thus a second passage track with GLORIA and 2 kHz high resolution seismic profiling was planned for this Cruise 111 transit leg. Allowance was made for Discovery to arrive in Halifax one day later than originally planned and it was hoped that an early transit of the Panama Canal and fair weather on transit would provide time for a deviation to the Blake-Bahama Outer Ridge area.
On the survey area the objectives mainly involved mapping of sea bed morphology using GLORIA and interpretation of large scale sedimentary features through 2 kHz high-resolution and precision echosounder profiling, and later linking these to 3.5 kHz profiles of Lamont-Doherty Geological Observatory. The resulting zonation of bottom morphology would then be related to current flow in the Western Boundary Undercurrent which is believed to have constructed the Outer Ridge themselves. |
Chief scientist | Robert B Kidd (Institute of Oceanographic Sciences Wormley Laboratory) |
Cruise report | (0.34 MB) |
Ocean/sea areas | |
General | North West Atlantic Ocean (limit 40W) Caribbean Sea |
Specific | N.W. Atlantic |
Track charts | |
Measurements | |
Meteorology | |
Routine standard measurements | Quantity: track kilometres = 5622 |
Geology and geophysics | |
Multi-beam echosounding | Quantity: track kilometres = 2667 |
Long/short range side scan sonar | Quantity: track kilometres = 1333 |
Gravity measurements | Quantity: track kilometres = 5622 |
Magnetic measurements | Quantity: track kilometres = 2667 |
Other geological/geophysical measurements | Quantity: track kilometres = 1333 Description: Gloria |
Other geological/geophysical measurements | Quantity: track kilometres = 2000 Description: 2 kHz profiler |