RV Corystes COR5/99

Cruise summary report

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Cruise Info.

Ship name (ship code)

RV Corystes (74RY)

Cruise identifier

COR5/99

Cruise period

1999-06-14 — 1999-07-01

Status

Completed

Port of departure

Lowestoft, United Kingdom

Port of return

Lowestoft, United Kingdom

Objectives

The work is directed at a better understanding of the dynamics of the circulation processes fringing thecnorth east coast of England, between the Firth of Forth and Flamborough Head, and in vicinity of the Dogger Bank. It is intended to characterise the extent and nature of the density driven and seasonal jet like circulation which acts as a direct and rapid pathway for transport of material from the coastal region to the central North Sea. Subsequently, the knowledge will be viewed with respect to concerns that elevated levels of contaminants on the Dogger Bank have originated in the near coastal region. Additionally, work includes the servicing of a mooring in the vicinity of the Outer Gabbard as part of the National Marine Monitoring Programme.
The main sampling aims of the cruise are:
1. To service a smart mooring at the Outer Gabbard.
2. To deploy five mooring arrays in the vicinity of the Dogger Bank.
3. Deploy free floating satellite tracked buoys in order to determine the Lagrangian circulation. Subsequently, a number may be retrieved.
4. To undertake Scanfish, CTD and grab surveys of the north-east coast and Dogger Bank to collect information on nutrients, suspended sediment and metals.
5. Conduct experiments to examine the near-bed cross frontal circulation.

Chief scientist

Juan Brown (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)

Cruise report

(0.14 MB)

Ocean/sea areas

General

North Sea

Specific

Dogger Bank

Track charts

Measurements

Physical oceanography

Surface measurements underway (T,S)

Quantity: activity duration in days = 17
Description: Logged hull PRT temperatures, salinity samples

CTD stations

Quantity: number of stations = 73
Description: Vertical profiles using FSI CTD with turbidity, PAR and chlorophyll sensors - some stations have data from near-surface only

Subsurface temperature and salinity measurements

Quantity: track kilometres = 1657.54
Description: Scanfish undulating towed body with temperature, conductivity, turbidity and fluorescence sensors

Optics (eg underwater light levels)

Quantity: number of stations = 73
Description: Vertical profiles using FSI CTD with turbidity, PAR and chlorophyll sensors - some stations have data from near-surface only

Current profiler (eg ADCP)

Quantity: activity duration in days = 17
Description: Underway current profiling using RDI ADCP

Chemical oceanography

Phosphate

Quantity: number of samples = 127
Description: Near surface samples along scanfish sections

Phosphate

Quantity: number of stations = 73
Description: General oceanics sampler used to collect samplesduring upcasts at each CTD station. Samples for conductivity/salinity calibration of CTD, plus nitrites, nitrates, silicates, ammonium, phosphate, suspended particulate matter, chlorophyll and phaeopigment. Samples for analyses of selected metals and particle size analyses at some stations.

Nitrate

Quantity: number of samples = 127
Description: Near surface samples along scanfish sections

Nitrate

Nitrite

Quantity: number of samples = 127
Description: Near surface samples along scanfish sections

Ammonia

Quantity: number of samples = 127
Description: Near surface samples along scanfish sections

Ammonia

Silicate

Quantity: number of samples = 127
Description: Near surface samples along scanfish sections

Silicate

Contamination

Suspended matter

Quantity: number of stations = 73
Description: Vertical profiles using FSI CTD with turbidity, PAR and chlorophyll sensors - some stations have data from near-surface only

Suspended matter

Quantity: track kilometres = 1657.54
Description: Scanfish undulating towed body with temperature, conductivity, turbidity and fluorescence sensors

Biology and fisheries

Phytoplankton pigs (eg chlorophyll, fluorescence)

Quantity: number of stations = 73
Description: Vertical profiles using FSI CTD with turbidity, PAR and chlorophyll sensors - some stations have data from near-surface only

Phytoplankton pigs (eg chlorophyll, fluorescence)

Quantity: track kilometres = 1657.54
Description: Scanfish undulating towed body with temperature, conductivity, turbidity and fluorescence sensors

Geology and geophysics

Core - soft bottom

Quantity: number of cores = 26
Description: Soft bottom cores

Moorings, landers, buoys

Physical oceanography

Optics (eg underwater light levels)

52° 0' 0" N 2° 19' 59" E — Single mooring recovered with pressure, temperature, conductivity, chlorophyll, turbidity and photosynthetically active radiation sensors - mooring was deployed May 1999 - sensors within upper 2m

Current profiler (eg ADCP)

55° 7' 59" N 0° 54' 59" E — Bottom mounted ADCPs deployed 15-16 June 1999 - planned recovery July 1999

Current profiler (eg ADCP)

55° 1' 59" N 1° 11' 59" E — Bottom mounted ADCPs deployed 15-16 June 1999 - planned recovery July 1999

Current profiler (eg ADCP)

54° 49' 59" N 0° 40' 59" E — Bottom mounted ADCPs deployed 15-16 June 1999 - planned recovery July 1999

Current profiler (eg ADCP)

54° 51' 0" N 1° 9' 59" E — Bottom mounted ADCPs deployed 15-16 June 1999 - planned recovery July 1999

Current profiler (eg ADCP)

54° 54' 59" N 1° 30' 0" E — Bottom mounted ADCPs deployed 15-16 June 1999 - planned recovery July 1999