Cruise inventory

RRS Discovery D188

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD188
Cruise period1990-01-24 — 1990-02-24
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnFunchal, Portugal
PurposeResearch
ObjectivesThe major objectives of the cruise were to investigate facies distributions, and sedimentation patterns and processes on the lower continental slope and around the Canary Islands using surface towed long-range sidescan sonar (GLORIA), deep-towed medium range sidescan sonar, 7 kHz profiler and fluxgate magentometer (TOBI), airgun and 3.5kHz seismic profilers, and various types of sediment core. The main area of interest was a large and complex sediment slide, the Saharan Slide, which extends from the upper continental slope off Spanish Sahara to the Madeira Abyssal Plain. It was planned that the major features of the sediment would be mapped using GLORIA, and that the GLORIA mosaic would then be used to choose areas of interest for investigation using TOBI. All TOBI work was to be navigated using the Oceano bottom transponder system. Because the cruise was also the first trial of the re-built TOBI system, some time at the beginning of the cruise was also planned for TOBI test runs.
Chief scientistDouglas G Masson (Institute of Oceanographic Sciences Deacon Laboratory)
Cruise reportRRS Discovery D188 cruise report d188.pdf — access key 'C' (0.64 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificBetween Madeira and the Canary Islands
Track chartsRRS Discovery D188 cruise track — trk3677.html
Measurements 
Geology and geophysics 
Single-beam echosoundingQuantity: track kilometres = 5500
Description: 10 kHz bathymetry
Long/short range side scan sonarQuantity: track kilometres = 400
Description: deep towed 7kHz profile data collected simultaneously with side scan
Long/short range side scan sonarQuantity: survey square kilometres = 2650
Description: TOBI medium range deep towed side-scan sonar (30kHz), 8 days of survey
Long/short range side scan sonarQuantity: activity duration in days = 11
Description: 168000sq.km, GLORIA long range side-scan sonar (6.5kHz)
Single channel seismic reflectionQuantity: track kilometres = 1300
Description: Airgun single channel seismic reflection
Single channel seismic reflectionQuantity: track kilometres = 5500
Description: 3.5kHz high-resolution profiler records
Gravity measurementsQuantity: track kilometres = 6100
Description: shipborne gravity