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Valdivia VLD174 (PROVESS N-1)

Cruise summary report

Cruise Info. 
Ship name (ship code)Valdivia (06AZ)
Cruise identifierVLD174 (PROVESS N-1)
Cruise period1998-09-05 — 1998-09-17
StatusCompleted
Port of departureBremerhaven, Germany
Port of returnBremerhaven, Germany
PurposeResearch
ObjectivesFirst of a series of four cruises in the northern North Sea carried out between September and November 1998 as part of the EU-MAST III PROVESS (PROcesses of Vertical Exchanges in Shelf Seas) project. It aimed to provide the initial conditions prior to or during the onset of the cooling phase and stormy wind season.
Cruise objectives:
- to deploy an array of 18 moorings close to 59deg20'N, 1deg00'E to measure time-series of meteorological, hydrographical and chemical quantities for the duration of the experiment (September-November 1998).
- to assess the hydrographic conditions in the PROVESS study area in the northern North Sea by means of CTD-surveys including distributions of chlorophyll-fluorescence and turbidity.
- to perform biological and chemical sampling for phytoplankton, photosynthetic pigments, particulate organic matter and dissolved oxygen.
- to observe temporal changes of the stratification and of the nutrient situation during the first phase of the autumnal changes of the summer stratification.
- to study the turbulence regimes in the water column above, across and beneath the thermocline to derive turbulence parameters for modelling of the vertical mixing processes.
Chief scientistGunther Krause (Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research)
ProjectPROVESS
Coordinating bodyEU-MAST (POL)
Cruise reportValdivia VLD174 (PROVESS N-1) cruise report valdivia174_98.pdf (0.86 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificNorthern North Sea
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 13
Description: CTD/water bottle sampling stations
Water bottle stationsQuantity: number of profiles = 166
Description: SeaBird 911 CTD unit with fluorometer, Mie backscattering sensor and rosette water sampler.
CTD stationsQuantity: number of profiles = 166
Description: SeaBird 911 CTD unit with fluorometer, Mie backscattering sensor and rosette water sampler.
Transparency (eg transmissometer)Quantity: number of profiles = 166
Description: SeaBird 911 CTD unit with fluorometer, Mie backscattering sensor and rosette water sampler.
Other physical oceanographic measurementsQuantity: number of profiles = 400
Description: MICSOS microstructure and turbulence profiler
Chemical oceanography 
OxygenQuantity: number of stations = 13
Description: CTD/water bottle sampling stations
NitrateQuantity: number of stations = 13
Description: CTD/water bottle sampling stations
SilicateQuantity: number of stations = 13
Description: CTD/water bottle sampling stations
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 13
Description: CTD/water bottle sampling stations
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 166
Description: SeaBird 911 CTD unit with fluorometer, Mie backscattering sensor and rosette water sampler.
Particulate organic matter (inc POC, PON)Quantity: number of stations = 13
Description: CTD/water bottle sampling stations
PhytoplanktonQuantity: number of stations = 13
Description: CTD/water bottle sampling stations
Geology and geophysics 
Bottom photographyQuantity: number of images = 12
Description: seabed photographs from bed-hopping camera
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements59° 19' 59" N  1° 4' 59" E — Rig R: 50 m thermistor chain
Subsurface temperature measurements59° 22' 27" N  1° 0' 0" E — Rig S: 40 m thermistor chain
Subsurface temperature measurements59° 19' 57" N  1° 0' 37" E — Rig L: 50 m thermistor chain + INFLUX meter
Transparency (eg transmissometer)59° 19' 52" N  1° 0' 3" E — Rig D: STABLE bottom lander
Transparency (eg transmissometer)59° 19' 22" N  1° 0' 38" E — Rig I: surface environment
Transparency (eg transmissometer)59° 19' 45" N  1° 0' 31" E — Rig J2: Nearbed environment
Transparency (eg transmissometer)59° 19' 34" N  1° 0' 38" E — Rig J1: Midwater environment
Current meters59° 19' 52" N  1° 0' 3" E — Rig D: STABLE bottom lander
Current meters59° 19' 5" N  0° 59' 59" E — Rig F: surface currents (Eta-rig)
Current meters59° 29' 12" N  1° 0' 1" E — Rig E: surface currents (J-rig)
Current profiler (eg ADCP)59° 19' 52" N  1° 0' 3" E — Rig D: STABLE bottom lander
Current profiler (eg ADCP)59° 19' 25" N  1° 0' 4" E — Rig C: 1.2MHz WH ADCP
Current profiler (eg ADCP)59° 19' 32" N  0° 59' 53" E — Rig B: 1.2MHz WH ADCP
Current profiler (eg ADCP)59° 19' 41" N  1° 0' 13" E — Rig A: 150kHz RDI ADCP
Current profiler (eg ADCP)59° 19' 58" N  1° 25' 4" E — Rig U: 150 kHz RDI ADCP
Current profiler (eg ADCP)59° 34' 36" N  0° 59' 35" E — Rig V: 150 kHz narrowband ADCP
Sea level (inc. bot. press., inverted echosounder)59° 45' 0" N  1° 0' 4" E — Rig Y: Seabed pressures (BPR)
Sea level (inc. bot. press., inverted echosounder)59° 19' 55" N  1° 40' 17" E — Rig X: Seabed pressure (BPR)
Sea level (inc. bot. press., inverted echosounder)59° 19' 52" N  1° 0' 3" E — Rig D: STABLE bottom lander
Sea level (inc. bot. press., inverted echosounder)59° 19' 58" N  1° 25' 4" E — Rig U: 150 kHz RDI ADCP
Sea level (inc. bot. press., inverted echosounder)59° 19' 41" N  1° 0' 13" E — Rig A: 150kHz RDI ADCP
Other physical oceanographic measurements59° 19' 45" N  1° 0' 31" E — Rig J2: Nearbed environment
Other physical oceanographic measurements59° 19' 22" N  1° 0' 38" E — Rig I: surface environment
Other physical oceanographic measurements59° 19' 52" N  1° 0' 3" E — Rig D: STABLE bottom lander
Other physical oceanographic measurements59° 19' 34" N  1° 0' 38" E — Rig J1: Midwater environment
Chemical oceanography 
Nitrate59° 19' 45" N  1° 0' 31" E — Rig J2: Nearbed environment
Nitrate59° 19' 22" N  1° 0' 38" E — Rig I: surface environment
Nitrate59° 19' 34" N  1° 0' 38" E — Rig J1: Midwater environment
Silicate59° 19' 45" N  1° 0' 31" E — Rig J2: Nearbed environment
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)59° 19' 22" N  1° 0' 38" E — Rig I: surface environment
Phytoplankton pigs (eg chlorophyll, fluorescence)59° 19' 34" N  1° 0' 38" E — Rig J1: Midwater environment
Meteorology 
Incident radiation59° 20' 36" N  0° 59' 43" E — Rig G: Meteorological Buoy
Other meteorological measurements59° 20' 36" N  0° 59' 43" E — Rig G: Meteorological Buoy
Data held at BODC Get data
Discrete samples 
168  CTD frame plus rosette samplerDensity of the water column
Chlorophyll pigment concentrations in water bodies
Salinity of the water column
Temperature of the water column
Carotenoid and flavenoid pigment concentrations in water bodies
Optical backscatter
Dissolved oxygen parameters in the water column
Phaeopigment concentrations in the water column
18  Instrument mooring
62  Microstructure and precision CTD profilerDensity of the water column
Temperature variation in the water column
Turbulence in the water column
Salinity of the water column
Temperature of the water column
2  Underwater camera system