Cruise inventory

RRS Discovery D248

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD248
Cruise period2000-07-08 — 2000-08-10
StatusCompleted
Port of departureGovan, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesA multidisciplinary study of the environment and ecology of deep-water coral ecosystems and associated seabed facies and features in the N.E. Atlantic Ocean (The Darwin Mounds, Porcupine Bank and Porcupine Seabight). Leg 1 focused on the ecology of the Darwin Mounds area with seabed photographic surveys, coring and trawling. Leg 2 undertook a detailed geological study of the same area using piston coring and side-scan sonar surveys, before studying carbonate mounds and coral communities on the Porcupine Bank and in the northeastern part of the Porcupine Seabight.
Chief scientistDouglas G Masson (Southampton Oceanography Centre), Paul A Tyler (University of Southampton School of Ocean and Earth Science)
ProjectAtlantic Coral Ecosystem Study (ACES)
Coordinating bodyEuropean Commission (University of Tubigen)
Cruise reportRRS Discovery D248 cruise report d248.pdf — access key 'C' (2.39 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificRockall Trough, Darwin Mounds, Porcupine Bank, Porcupine Seabight (NE)
Track chartsRRS Discovery D248 cruise track — d248track.pdf (00 MB) 
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 2
Description: Total water column casts (c.1000m depth). Water bottle samples 5m and 150m above seabed.
CTD stationsQuantity: number of stations = 2
Description: Total water column casts (c.1000m depth). Water bottle samples 5m and 150m above seabed.
Contamination 
Suspended matterQuantity: number of stations = 7
Description: Stand alone pumps for large volume filtration of particulate material
Biology and fisheries 
ZoobenthosQuantity: number of stations = 39
Description: Box curer (USNEL) for macrobenthos, coral and giant protozoans (xenophyophores)
ZoobenthosQuantity: number of stations = 4
Description: Agassiz trawl for megabenthos
ZoobenthosQuantity: number of stations = 12
Description: Multiple corer (SMBA) for meiobenthos
Geology and geophysics 
DredgeQuantity: number of stations = 1
Description: Rock dredge
Core - soft bottomQuantity: number of stations = 22
Description: Piston corer 3-9m barrel length on sand mounds, pockmarks and other seabed features
Bottom photographyQuantity: number of stations = 20
Description: Drifting vieo and still camera on conducting cable, 1-5m above seabed, c.3hrs for each station. Faunal and seabed feature surveys.
Long/short range side scan sonarQuantity: activity duration in hours = 103
Description: 100/410 KHz sidescan sonar surveys showing seabed mounds, trawl tracks and other features
Moorings, landers, buoys 
Physical oceanography 
Transparency (eg transmissometer)59° 49' 59" N  7° 19' 59" W — Optical (transmissometer) recorder c.1m above seabed on top of sand mound c.5m high. Deployed 11 July, recovered 31 July 2000.
Current meters59° 49' 59" N  7° 20' 59" W — Current meter 1m above seabed in area downstream of sand mound. Deployed 12 July, recovered 31 July 2000.
Current meters59° 49' 59" N  7° 19' 59" W — Current meter 1m above seabed in area upstream of sand mound. Deployed 11 July, recovered 31 July 2000.
Current meters59° 49' 0" N  7° 20' 59" W — Current meter 1m above seabed in area downstream of sand mound. Deployed 12 July, recovered 31 July 2000.
Geology and geophysics 
Bottom photography51° 27' 0" N  11° 45' 0" W — Time lapse photography on coral mound. Deployed 08 August 2000.
Bottom photography59° 49' 59" N  7° 19' 59" W — Time lapse photography on sand mound. Deployed 12 July, recovered 31 July 2000.
Data held at BODC 
Discrete samples 
2  CTD frame plus rosette samplerRaw suspended particulate material concentration sensor output
Raw fluorometer output
Salinity of the water column
Raw light meter output
Temperature of the water column
Dissolved oxygen parameters in the water column