Cruise inventory

RRS Discovery D97

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD97
Cruise period1978-12-06 — 1978-12-21
Port of departureRecife, Brazil
Port of returnRecife, Brazil
Objectives1. To collect tidal pressure records from a line of stations between West Africa and Northeast Brazil, to be supplemented by tide gauge records from coastal ports and islands of both continents. The records were required not only for tidal boundary conditions for the North Atlantic Ocean, but also to define low frequency pressure waves with possible coherence across the ocean, of interest to the international FGGE exercise. IOS had also sent D.L. Leighton to Ascension Island just before the cruise, to install a pressure recorder at the jetty there.
2. To record surface and deep currents at the Equator at about 32.5W, for comparison with pressure gradients measured simultaneously, again of potential FGGE interest.
3. To take CTD and current profiles from surface to 500m at two equatorial cross-sections, 1N to 1S along the meridians 27.5W and 32.5W, for definition of the undercurrent structure, for FGGE. All records of wind and surface currents in the equatorial regions were similarly relevant.
4. To attempt recovery of a current meter mooring laid by Institut fur Meereskunde, Kiel in December 1977 at about 32N, 22W.
Chief scientistLeonard M Skinner (Research Vessel Services)
Cruise reportRRS Discovery D97 cruise report d95and97.pdf — access key 'C' (0.83 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
Track chartsRRS Discovery D97 cruise track — trk2204b.html
Physical oceanography 
Surface measurements underway (T,S)
CTD stations
Geology and geophysics 
Single-beam echosoundingDescription: Echo sounding carried out throughout the cruise with manual logging at 6 minute intervals.
Magnetic measurementsDescription: Magnetometer deployed throughout the cruise.
Moorings, landers, buoys 
Physical oceanography 
Current meters0° 19' 59" S  32° 28' 59" W — Current meter recovered
Sea level (inc. bot. press., inverted echosounder)0° 57' 59" N  35° 34' 59" W — Tide gauge recovered
Sea level (inc. bot. press., inverted echosounder)3° 7' 59" N  25° 3' 59" W — Tide gauge recovered
Sea level (inc. bot. press., inverted echosounder)0° 55' 59" N  29° 16' 59" W — Tide gauge recovered
Sea level (inc. bot. press., inverted echosounder)10° 5' 59" N  17° 13' 59" W — Tide gauge recovered
Sea level (inc. bot. press., inverted echosounder)6° 3' 59" N  20° 57' 59" W — Tide gauge recovered