Cruise inventory

RRS Challenger CH121C

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH121C
Cruise period1995-09-01 — 1995-09-10
StatusCompleted
Port of departureMallaig, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesCH121 was the second of six cruises under the LOIS Shelf Edge Study (SES) aimed at defining the nature of the processes occurring at the shelf edge, their seasonal variability and their impact on the fluxes of nutrients and carbon across the shelf and into the seabed sediments through the shelf.
The cruise was divided into three legs with the first and third being principally directed to the deployment and recovery of an extensive mooring array and the acquisition of sediment cores from selected sites in the SES area. The second leg had a series of objectives concerned with measuring the water column structure and velocity field in the shelf edge regime. To complement the time series data from the moored array of current meters and thermistor chains, the cruise plan called for measurements by shipboard adcp and CTD together to help identify the motions associated with internal tides and waves. These motions, which are generated at the shelf edge, may contribute to turbulent mixing and dissipation and the distribution of the latter was to be investigated with the aid of the FLY free-fall turbulence probe which was to be investigated. More wide-ranging spatial measurements were required to demonstrate the continuity of the slope current and to investigate its cross slope structure.
While this cruise was principally concerned with the physics of the shelf edge system, the programme was also designed to obtain an extensive set of measurements of chlorophyll a, primary production and nutrient concentrations in parallel with physical observations. A further goal was to acquire surficial sediment material from a number of sites down the slope.
Chief scientistJohn H Simpson (University of Wales, Bangor School of Ocean Sciences)
ProjectLOIS - SES
Coordinating bodyUK NERC/Proudman Oceanographic Laboratory (POL)
Cruise reportRRS Challenger CH121C cruise report ch121_95.pdf — access key 'C' (1.92 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNE Atlantic, Malin Shelf Break (60nm west of Hebrides)
Track chartsRRS Challenger CH121C cruise track — trk4120.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 500
Description: surface underway measurements
CTD stationsQuantity: number of profiles = 32
Description: CTD plus transmissometer,fluorometer,O2 sensors,PAR sensors
Transparency (eg transmissometer)Quantity: track kilometres = 500
Description: surface underway measurements
Transparency (eg transmissometer)Quantity: number of profiles = 32
Description: on CTD
Optics (eg underwater light levels)Quantity: track kilometres = 500
Description: surface underway measurements
Optics (eg underwater light levels)Quantity: number of profiles = 32
Description: on CTD
Current metersQuantity: number of recoveries = 7
Current profiler (eg ADCP)Quantity: track kilometres = 500
Description: shipborne ADCP
Chemical oceanography 
OxygenQuantity: number of profiles = 32
Description: on CTD
Contamination 
Suspended matterQuantity: number of samples = 42
Description: 2 sediment traps deployed at 56 43.5N, 9 24.3W (redeployed)
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 32
Description: on CTD
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 64
Description: bottle samples for chlorophyll determination
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: track kilometres = 500
Description: surface underway measurements
Geology and geophysics 
Core - soft bottomQuantity: number of deployments = 9
Description: 8 multi- & 1 Sholkovitz core for bio- & geochemical analysis
Moorings, landers, buoys 
Physical oceanography 
Current meters56° 28' 23" N  9° 9' 53" W — Site S700, recovered
Current meters56° 27' 47" N  8° 57' 47" W — Site S140, deployed
Current meters56° 26' 42" N  9° 3' 6" W — S400 site recovered, ADCP and STABLE
Current meters56° 27' 6" N  9° 4' 48" W — Site S400, recover/redeploy pop-up ADCP, recover pop-up current meter
Current meters56° 43' 36" N  9° 24' 11" W — Site N1500 recovered, current meter/transmissometer, sediment trapr
Current meters56° 37' 23" N  9° 1' 30" W — Site N300 recovered
Current meters56° 27' 36" N  9° 3' 36" W — Site S300, recovered, redeployed- and lost a few days later
Surface drifters/drifting buoys56° 27' 47" N  9° 7' 54" W — subsurface drogue (surface/subsurface temperature), deployed
Other physical oceanographic measurements56° 27' 36" N  8° 58' 0" W — acoustic study of bubble entrapment (ARIES II) recovery
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)56° 29' 53" N  9° 2' 35" W — toroid buoy with nitrate analysers and fluorometers
Phytoplankton pigs (eg chlorophyll, fluorescence)56° 28' 0" N  8° 52' 36" W — toroid buoy with nitrate analysers and fluorometers
Data held at BODC 
Series/Profiles 
1  Accelerometer-waverider buoy
Wave height and period statistics
Date and time
Wave height and period statistics
Date and time

BODC idDate/TimeLocationDoc.
5078151995-09-05 18:00  — 1995-11-07 06:00 56° 27' 28" N  8° 58' 13" W  View metadata report for BODC series reference number 507815
2  Acoustic doppler current profiler
Vertical velocity of the water column (currents)
Metadata parameters
Vertical spatial coordinates
Horizontal velocity of the water column (currents)
Date and time
Vertical velocity of the water column (currents)
Metadata parameters
Vertical spatial coordinates
Horizontal velocity of the water column (currents)
Date and time

BODC idDate/TimeLocationDoc.
4441971995-09-04 18:34:59  — 1995-11-19 09:05 56° 27' 49" N  8° 57' 59" W  View metadata report for BODC series reference number 444197
4442531995-09-06 07:55  — 1995-11-27 08:15 56° 27' 11" N  9° 4' 50" W  View metadata report for BODC series reference number 444253
25  Bottle station
Quality control flags
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Phaeopigment concentrations in the water column
Reference numbers
Quality control flags
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Phaeopigment concentrations in the water column
Reference numbers

BODC idDate/TimeLocationDoc.
16874011995-09-02 09:14 56° 27' 59" N  8° 58' 16" W  View metadata report for BODC series reference number 1687401
16874131995-09-02 14:23 56° 37' 28" N  9° 1' 28" W  View metadata report for BODC series reference number 1687413
16874251995-09-02 17:15 56° 27' 2" N  9° 4' 27" W  View metadata report for BODC series reference number 1687425
16874371995-09-03 02:59 56° 27' 38" N  9° 18' 0" W  View metadata report for BODC series reference number 1687437
16874491995-09-03 07:41 56° 27' 10" N  9° 3' 47" W  View metadata report for BODC series reference number 1687449
16874501995-09-03 13:43 56° 27' 56" N  9° 8' 4" W  View metadata report for BODC series reference number 1687450
16874621995-09-03 19:35 56° 26' 48" N  9° 2' 16" W  View metadata report for BODC series reference number 1687462
16874741995-09-03 20:49 56° 29' 56" N  8° 56' 2" W  View metadata report for BODC series reference number 1687474
16874861995-09-03 21:45 56° 30' 17" N  9° 2' 14" W  View metadata report for BODC series reference number 1687486
16874981995-09-03 22:29 56° 30' 20" N  9° 3' 41" W  View metadata report for BODC series reference number 1687498
16875051995-09-03 23:27 56° 30' 34" N  9° 7' 5" W  View metadata report for BODC series reference number 1687505
16875171995-09-04 00:29 56° 30' 54" N  9° 11' 5" W  View metadata report for BODC series reference number 1687517
16875291995-09-04 01:49 56° 31' 6" N  9° 18' 1" W  View metadata report for BODC series reference number 1687529
16875301995-09-04 08:01 56° 43' 47" N  9° 25' 50" W  View metadata report for BODC series reference number 1687530
16875421995-09-04 15:44 56° 27' 52" N  8° 57' 48" W  View metadata report for BODC series reference number 1687542
16875541995-09-05 02:34 56° 38' 43" N  9° 6' 36" W  View metadata report for BODC series reference number 1687554
16875661995-09-05 03:44 56° 40' 24" N  9° 11' 43" W  View metadata report for BODC series reference number 1687566
16875781995-09-05 09:02 56° 42' 46" N  9° 25' 39" W  View metadata report for BODC series reference number 1687578
16875911995-09-06 01:40 56° 27' 29" N  9° 39' 0" W  View metadata report for BODC series reference number 1687591
16876091995-09-06 05:33 56° 36' 16" N  9° 17' 12" W  View metadata report for BODC series reference number 1687609
16876101995-09-07 00:24 56° 37' 13" N  9° 0' 33" W  View metadata report for BODC series reference number 1687610
16876221995-09-07 02:25 56° 37' 37" N  9° 1' 31" W  View metadata report for BODC series reference number 1687622
16876341995-09-07 03:10 56° 38' 6" N  9° 3' 59" W  View metadata report for BODC series reference number 1687634
16876461995-09-07 04:47 56° 34' 8" N  9° 3' 14" W  View metadata report for BODC series reference number 1687646
16876581995-09-07 05:21 56° 33' 51" N  9° 1' 55" W  View metadata report for BODC series reference number 1687658
1  Bottom pressure sensor tide gauge
Sea level
Temperature of the water column
Date and time
Sea level
Temperature of the water column
Date and time

BODC idDate/TimeLocationDoc.
4426401995-09-04 18:30:21  — 1995-11-19 09:30:21 56° 27' 49" N  8° 57' 59" W  View metadata report for BODC series reference number 442640
32  CTD/STD cast
Density of the water column
Transmittance and attenuance of the water column
Visible waveband radiance and irradiance measurements in the water column
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Salinity of the water column
Temperature of the water column
Density of the water column
Transmittance and attenuance of the water column
Visible waveband radiance and irradiance measurements in the water column
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Salinity of the water column
Temperature of the water column

BODC idDate/TimeLocationDoc.
8518561995-09-01 19:03 56° 49' 4" N  6° 39' 38" W  View metadata report for BODC series reference number 851856
8518681995-09-02 08:59 56° 28' 0" N  8° 58' 16" W  View metadata report for BODC series reference number 851868
8518811995-09-02 12:12 56° 28' 20" N  9° 5' 0" W  View metadata report for BODC series reference number 851881
8518931995-09-02 14:11 56° 37' 28" N  9° 1' 28" W  View metadata report for BODC series reference number 851893
8519001995-09-02 20:01 56° 28' 32" N  9° 9' 47" W  View metadata report for BODC series reference number 851900
8519121995-09-03 02:34 56° 27' 38" N  9° 18' 0" W  View metadata report for BODC series reference number 851912
8519241995-09-03 13:29 56° 27' 56" N  9° 8' 4" W  View metadata report for BODC series reference number 851924
8519361995-09-03 21:40 56° 30' 17" N  9° 2' 14" W  View metadata report for BODC series reference number 851936
8519481995-09-03 22:18 56° 30' 20" N  9° 3' 42" W  View metadata report for BODC series reference number 851948
8519611995-09-03 23:13 56° 30' 34" N  9° 7' 5" W  View metadata report for BODC series reference number 851961
8519731995-09-04 01:21 56° 31' 7" N  9° 18' 1" W  View metadata report for BODC series reference number 851973
8519851995-09-04 07:29 56° 43' 46" N  9° 25' 50" W  View metadata report for BODC series reference number 851985
8519971995-09-04 20:42 56° 31' 8" N  9° 17' 58" W  View metadata report for BODC series reference number 851997
8520001995-09-05 02:18 56° 38' 43" N  9° 6' 36" W  View metadata report for BODC series reference number 852000
8520121995-09-05 08:33 56° 42' 46" N  9° 25' 39" W  View metadata report for BODC series reference number 852012
8520241995-09-06 01:13 56° 27' 29" N  9° 39' 0" W  View metadata report for BODC series reference number 852024
8520361995-09-06 23:37 56° 36' 18" N  8° 55' 49" W  View metadata report for BODC series reference number 852036
8520481995-09-07 00:16 56° 37' 13" N  9° 0' 33" W  View metadata report for BODC series reference number 852048
8520611995-09-07 02:17 56° 37' 37" N  9° 1' 31" W  View metadata report for BODC series reference number 852061
8520731995-09-07 04:04 56° 33' 38" N  9° 0' 8" W  View metadata report for BODC series reference number 852073
8520851995-09-07 04:37 56° 34' 8" N  9° 3' 13" W  View metadata report for BODC series reference number 852085
8520971995-09-07 13:04 56° 34' 36" N  9° 6' 39" W  View metadata report for BODC series reference number 852097
8521041995-09-02 17:07 56° 27' 1" N  9° 4' 27" W  View metadata report for BODC series reference number 852104
8521161995-09-03 07:27 56° 27' 10" N  9° 3' 47" W  View metadata report for BODC series reference number 852116
8521281995-09-03 20:42 56° 29' 57" N  8° 56' 3" W  View metadata report for BODC series reference number 852128
8521411995-09-04 00:07 56° 30' 54" N  9° 11' 4" W  View metadata report for BODC series reference number 852141
8521531995-09-05 03:20 56° 40' 24" N  9° 11' 43" W  View metadata report for BODC series reference number 852153
8521651995-09-06 05:10 56° 36' 16" N  9° 17' 12" W  View metadata report for BODC series reference number 852165
8521771995-09-07 02:53 56° 38' 6" N  9° 4' 0" W  View metadata report for BODC series reference number 852177
8521891995-09-07 05:15 56° 33' 51" N  9° 1' 55" W  View metadata report for BODC series reference number 852189
8521901995-09-03 19:24 56° 26' 48" N  9° 2' 16" W  View metadata report for BODC series reference number 852190
8522081995-09-04 15:35 56° 27' 52" N  8° 57' 47" W  View metadata report for BODC series reference number 852208
1  Fluorometers
Chlorophyll pigment concentrations in water bodies
Raw fluorometer output
Date and time
Chlorophyll pigment concentrations in water bodies
Raw fluorometer output
Date and time

BODC idDate/TimeLocationDoc.
4760831995-09-04 17:02:56  — 1995-11-24 02:02:56 56° 27' 58" N  8° 57' 31" W  View metadata report for BODC series reference number 476083
4  Paddle wheel current meter
Moored instrument depth
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Salinity of the water column
Horizontal velocity of the water column (currents)
Temperature of the water column
Date and time
Moored instrument depth
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Salinity of the water column
Horizontal velocity of the water column (currents)
Temperature of the water column
Date and time

BODC idDate/TimeLocationDoc.
4361971995-09-02 09:15  — 1995-11-19 12:15 56° 27' 42" N  8° 57' 51" W  View metadata report for BODC series reference number 436197
4393791995-09-02 08:44  — 1995-11-19 12:14 56° 27' 42" N  8° 57' 51" W  View metadata report for BODC series reference number 439379
4313651995-09-03 11:15  — 1995-09-05 23:15 56° 27' 31" N  9° 3' 43" W  View metadata report for BODC series reference number 431365
4314331995-09-03 11:15  — 1995-09-05 23:15 56° 27' 31" N  9° 3' 43" W  View metadata report for BODC series reference number 431433
1  Pumped water sample
Chlorophyll pigment concentrations in water bodies
Horizontal spatial co-ordinates
Phaeopigment concentrations in the water column
Date and time
Chlorophyll pigment concentrations in water bodies
Horizontal spatial co-ordinates
Phaeopigment concentrations in the water column
Date and time

BODC idDate/TimeLocationDoc.
16785381995-09-02 08:42  — 1995-09-07 07:30 56° 26' 47" N  9° 25' 49" W — 56° 43' 53" N  8° 55' 58" W  View metadata report for BODC series reference number 1678538
3  Thermistor chain
Vertical spatial coordinates
Temperature of the water column
Date and time
Vertical spatial coordinates
Temperature of the water column
Date and time

BODC idDate/TimeLocationDoc.
4395151995-09-02 09:00  — 1995-11-19 12:00 56° 27' 42" N  8° 57' 51" W  View metadata report for BODC series reference number 439515
4397481995-09-03 11:30  — 1995-09-05 23:00 56° 27' 31" N  9° 3' 43" W  View metadata report for BODC series reference number 439748
4395401995-09-03 11:30  — 1995-09-05 23:00 56° 27' 31" N  9° 3' 43" W  View metadata report for BODC series reference number 439540
1  Transmissometer
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Salinity of the water column
Temperature of the water column
Date and time
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Salinity of the water column
Temperature of the water column
Date and time

BODC idDate/TimeLocationDoc.
4961391995-09-04 16:12  — 1995-11-27 11:27 56° 27' 58" N  8° 57' 31" W  View metadata report for BODC series reference number 496139
Discrete samples 
32  CTD frame plus rosette samplerParticulate total and organic carbon concentrations in the water column
Particulate total and organic nitrogen concentrations in the water column
Density of the water column
Transmittance and attenuance of the water column
Visible waveband radiance and irradiance measurements in the water column
Chlorophyll pigment concentrations in water bodies
Salinity of the water column
Temperature of the water column
Phaeopigment concentrations in the water column
1  Instrument mooringSedimentation flux of carbon, nitrogen or organic matter in the water column
Carbon concentrations in suspended particulate material
Concentration of silicon species in suspended particulate material
Sedimentation flux of non-metallic inorganic species in the water column
Nitrogen concentrations in suspended particulate material
Other physical and chemical properties of suspended particulate material
Sedimentation flux quantification in the water column
6  MulticorerSediment water content, porosity and surface area
Stable isotope enrichment in sediment
Other fluxes between the bed and the water column
Concentration of organic matter in sediments
Concentration of inorganic sulphur species in sediment
30  Sample taken from ship's non-toxic supplyChlorophyll pigment concentrations in water bodies
Salinity of the water column
Phaeopigment concentrations in the water column