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RRS Challenger CH140 (PROVESS N-4)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH140 (PROVESS N-4)
Cruise period1998-10-21 — 1998-11-11
StatusCompleted
Port of departureGreenock, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesLast of a series of four cruises carried out in the northern North Sea between September and November 1998 as part of the EU MAST III project PROVESS (PROcesses of Vertical Exchanges in Shelf Seas). The cruise objectives were:
1- to study benthic exchanges of nutrients and dissolved oxygen
2- to study the in situ particle sizes of suspended particulate matter
3- to deploy, turn round and recover moorings and bottom frames deployed during cruise Valdivia VA174 and Pelagia PE125
4- to study the water column properties by obtaining CTD profiles and water samples.
The cruise was split into two legs, from Greenock to Peterhead (21 to 30 October) and from Peterhead to Southampton (30 October to 11 November). During both legs, the main study site was located in the vicinity of 59° 20' N, 1° E.
Chief scientistM John Howarth (Proudman Oceanographic Laboratory)
ProjectPROVESS
Coordinating bodyEU-MAST (POL)
Cruise reportRRS Challenger CH140 (PROVESS N-4) cruise report ch140.pdf (0.13 MB) 
Ocean/sea areas 
GeneralNorth Sea
Measurements 
Physical oceanography 
Water bottle stationsDescription: measurements on CTD-rosette water bottle samples
Water bottle stationsDescription: measurements on CTD-rosette water samples
CTD stationsQuantity: number of profiles = 60
Description: Neil Brown CTD
Transparency (eg transmissometer)Quantity: number of profiles = 59
Description: LISST laser in situ particle sizer
Transparency (eg transmissometer)Quantity: number of profiles = 60
Description: Neil Brown CTD
Optics (eg underwater light levels)Quantity: number of profiles = 60
Description: Neil Brown CTD
Chemical oceanography 
OxygenQuantity: number of profiles = 60
Description: Neil Brown CTD
OxygenQuantity: number of cores = 8
Description: Collected from 6 sediment corer deployments at the main study site on 26/10/98 in a water depth of 105 m.
OxygenDescription: measurements on CTD-rosette water samples
PhosphateDescription: measurements on CTD-rosette water samples
NitrateDescription: measurements on CTD-rosette water samples
NitriteDescription: measurements on CTD-rosette water samples
SilicateDescription: measurements on CTD-rosette water samples
Contamination 
Suspended matterQuantity: number of profiles = 59
Description: LISST laser in situ particle sizer
Suspended matterQuantity: number of deployments = 14
Description: Settling Velocity Tubes
Suspended matterDescription: measurements on CTD-rosette water bottle samples
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of cores = 8
Description: Collected from 6 sediment corer deployments at the main study site on 26/10/98 in a water depth of 105 m.
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of deployments = 14
Description: Settling Velocity Tubes
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 60
Description: Neil Brown CTD
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: measurements on CTD-rosette water samples
Particulate organic matter (inc POC, PON)Quantity: number of cores = 8
Description: Collected from 6 sediment corer deployments at the main study site on 26/10/98 in a water depth of 105 m.
Particulate organic matter (inc POC, PON)Description: measurements on CTD-rosette water samples
PhytoplanktonDescription: measurements on CTD-rosette water samples
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 8
Description: Collected from 6 sediment corer deployments at the main study site on 26/10/98 in a water depth of 105 m.
Bottom photography
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Transparency (eg transmissometer)59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Current meters59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Current profiler (eg ADCP)59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Sea level (inc. bot. press., inverted echosounder)59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Other physical oceanographic measurements59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Chemical oceanography 
Nitrate59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Silicate59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Meteorology 
Incident radiation59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Other meteorological measurements59° 1' 59" N  1° 0' 0" E — 19 Rigs deployed
Data held at BODC Get data
Discrete samples 
60  CTD frame plus rosette samplerAmmonium and ammonia concentration parameters in water bodies
Density of the water column
Visible waveband radiance and irradiance measurements in the water column
Transmittance and attenuance of the water column
Chlorophyll pigment concentrations in water bodies
Metadata parameters
Raw fluorometer output
Silicate concentration parameters in the water column
Concentration of suspended particulate material in the water column
Salinity of the water column
Temperature of the water column
Raw light meter output
Nitrate concentration parameters in the water column
Dissolved oxygen parameters in the water column
Phosphate concentration parameters in the water column
2  Instrument mooring
3  MulticorerSediment water content, porosity and surface area
Other fluxes between the bed and the water column
Concentration of organic matter in sediments
Geological sample density
27  Sample taken from ship's non-toxic supplyChlorophyll pigment concentrations in water bodies
Salinity of the water column
2  Sediment-water interfacial sampler
59  Sequoia Inst. Laser In Situ particle size profilerTransmittance and attenuance of the water column
Suspended particulate material grain size parameters
Sediment grain size parameters
Concentration of suspended particulate material in the water column
Temperature of the water column
14  Settling velocity tubeSuspended particulate material setting velocity parameters
Concentration of suspended particulate material in the water column
3  Underwater camera system