European Directory of Marine Environmental Data (EDMED)

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General
Data set name

Sulphide and methane-based ecosystems in the North Sea and Skagerrak (1991)

Data holding centreMarine Biological Association of the UK
CountryUnited Kingdom  United Kingdom
Time periodFrom 12 July to 01 August 1991
OngoingNo
Geographical area

North Sea (UK Block 15/25, Witch Ground Basin), Skagerrak

Observations 
Parameters

Alkalinity, acidity and pH of the water column; Ammonium and ammonia concentration parameters in water bodies; Carbon concentrations in sediment; Carbonate chemistry in sediment pore waters; Dissolved oxygen concentration parameters in sediment pore waters; Dissolved organic carbon concentration in the water column; Fauna abundance per unit area of the bed; Vertical velocity of the water column (currents); Bathymetry and Elevation; Dissolved organic carbon concentrations in sediment pore waters; Salinity of the water column; Horizontal velocity of the water column (currents); Redox potential in sediment; Seabed photography; Stable isotope enrichment in sediment pore waters; Concentration of inorganic sulphur species in sediment pore water; Side-scan sonar; Stable isotope enrichment in sediment; Total dissolved inorganic carbon (TCO2) concentration in the water column; Temperature of the water column; Zoobenthos dry weight biomass; Zoobenthos taxonomic abundance; Zoobenthos taxonomy-related counts; Zoobenthos taxonomy-related wet weight biomass per unit area of the bed; Concentration of inorganic sulphur species in sediment

Instruments

Current profilers; CTD; sidescan sonars; single-beam echosounders; underwater cameras; discrete water samplers; unconsolidated sediment corers; rock dredges

Description 
Summary

The project is designed to study sulphide and methane based ecosystems and a large volume of data has been collected to facilitate this. Geophysical surveys have been made in the North Sea (Witch Ground Basin) and the Skagerrak. In the Witch Ground Basin surveys were carried out for shallow gas and seeps. Box core samples were taken to compare biomass and species composition of zoobenthos within pockmarks and on the flat sand bed. Measurements were made of dissolved gas concentrations in the water column within an area of gas seepage. In the Skagerrak surveys were carried out over an area where seepage is known to occur. A bathymetric map of the area has been produced with the aim of relating seepage areas to bottom topography. Sediment chemistry and zoobenthos in sediment cores have been compared in seep and non-seep areas. Estimates of the input of methane derived carbon into the zoobenthos have been made. Bottom photographs were taken.

OriginatorsMarine Biological Association of the UK
Availability 
OrganisationMarine Biological Association of the UK
AvailabilityBy negotiation
ContactThe Director
Address

Marine Biological Association of the UK
Citadel Hill
Plymouth
Devon
PL1 2PB
United Kingdom

Telephone+44 1752 222772
Administration 
Collating centreBritish Oceanographic Data Centre
Local identifier1051009
Global identifier680
Last revised2009-12-01