Cruise inventory

RRS Charles Darwin CD72

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Charles Darwin (74AB)
Cruise identifierCD72
Cruise period1992-08-24 — 1992-09-11
StatusCompleted
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
PurposeResearch
ObjectivesThe site of study during this cruise was 49 degrees north 16 degrees 20' west. The main objectives were:
1. To recover and deploy moorings as part of a long term study of particle flux at this site.
2. to collect various classes of particle for an on board study and experimentation with particular emphasis on their microbiology and molecular biology.
3. To obtain acoustic information using the on-board and bottom mounted ADCP and to relate these data to the physical structure of the water column and to the net collected plankton.
4. To examine the diel variability of one particular class of particle.
5. To use some of the collected biological specimens for experimentation on their behaviour.
Chief scientistRichard Stephen Lampitt (Institute of Oceanographic Sciences Deacon Laboratory)
Cruise reportRRS Charles Darwin CD72 cruise report cd72.pdf — access key 'C' (0.68 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificPorcupine Abyssal Plain, 49N;01630W
Track chartsRRS Charles Darwin CD72 cruise track — trk3853.html
Measurements 
Physical oceanography 
BathythermographQuantity: number of profiles = 46
CTD stationsQuantity: number of profiles = 5
Description: 3<300m & 2 4500m
Transparency (eg transmissometer)Quantity: number of profiles = 5
Description: 3<300m & 2 4500m
Optics (eg underwater light levels)Quantity: number of stations = 2
Description: recovered & redeployed
Current metersQuantity: number of stations = 2
Description: recovered & rredeployed
Current profiler (eg ADCP)Quantity: track kilometres = 600
Description: RDI ADCP
Chemical oceanography 
OxygenQuantity: number of profiles = 5
Description: 3<300m & 2 4500m
Biology and fisheries 
Primary productivityQuantity: number of measurements = 21
Description: 10m - GOFLO
Sediment trapsQuantity: number of stations = 3
Description: recovered & redeployed
ZooplanktonQuantity: number of hauls = 15
Description: 6:RMT1+8 net, 6:small nets, 3: LHPR
SestonQuantity: number of samples = 2
Description: 100 l samples for large rare particles
NektonQuantity: number of hauls = 6
Description: RMT1+8 net
Pelagic bacteria/micro-organismsQuantity: number of stations = 5
Description: microbiology and molecular biology
Acoustic reflection on marine organisms.Quantity: track kilometres = 600
Description: ADCP for backscatter strength
Other biological/fisheries measurementQuantity: number of samples = 21
Description: 10m - GOFLO
Meteorology 
Routine standard measurementsQuantity: track kilometres = 800
Description: underway meteorology
Geology and geophysics 
Bottom photographyQuantity: number of stations = 2
Description: recovered & redeployed
Moorings, landers, buoys 
Physical oceanography 
Optics (eg underwater light levels)48° 58' 59" N  16° 22' 0" W — photographic device on mooring above redeployed
Optics (eg underwater light levels)48° 55' 59" N  16° 19' 0" W — camera to record large particles
Current meters48° 55' 59" N  16° 19' 0" W — mooring deployed 6 April 1992
Current meters48° 58' 59" N  16° 22' 0" W — redeployed
Biology and fisheries 
Sediment traps48° 55' 59" N  16° 19' 0" W — Recovered - 3 1171m, 3000m and 4400m
Sediment traps48° 58' 59" N  16° 22' 0" W — Redeploy sediment trap mooring as above
Sediment traps48° 53' 59" N  16° 26' 59" W — Drifting, 2 traps (2175m,2205m depth) for 3 days
Geology and geophysics 
Bottom photography48° 57' 0" N  16° 19' 0" W — Recover bottom time lapse camera system
Bottom photography48° 55' 59" N  16° 22' 0" W — Redeploy bottom time lapse camera system above
Data held at BODC 
Discrete samples 
4  CTD frame plus rosette samplerDensity of the water column
Transmittance and attenuance of the water column
Raw fluorometer output
Salinity of the water column
Temperature of the water column
Dissolved oxygen parameters in the water column