4 sites and 89 equipment deployments covering the offshore Southern Indian Ocean /Southern Ocean in the region of the Crozet Plateau. (Data set limits -49 to -44 deg. N; 49 deg. E to 56 deg. E.)

Horizontal spatial co-ordinates; Bacteria in biota; Air pressure; Sediment lipid concentrations; Air temperature; Atmospheric humidity; Variable fluorescence parameters; Particulate total and organic carbon concentrations in the water column; Chlorophyll pigment concentrations in sediment; Chlorophyll pigment concentrations in water bodies; Dissolved oxygen parameters in the water column; Wind strength and direction; Biota lipid concentrations; Vertical velocity of the water column (currents); Particulate total and organic nitrogen concentrations in the water column; Optical backscatter; Phaeopigment concentrations in sediment; Salinity of the water column; Horizontal velocity of the water column (currents); Phaeopigment concentrations in the water column; Visible waveband radiance and irradiance measurements in the atmosphere; Transmittance and attenuance of the water column; Nitrogen concentrations in sediment; Bathymetry and Elevation; Carotenoid pigment concentrations in sediment; Carbon concentrations in sediment; Water body lipid concentrations; Temperature of the water column; Inorganic chemical composition of sediment or rocks

Anemometers; meteorological packages; fluorometers; radiometers; optical backscatter sensors; thermosalinographs; single-beam echosounders; benthos samplers; unconsolidated sediment corers; sieves and filters; gas chromatographs; gas chromatograph mass spectrometers; transmissometers; CTD; current profilers; dissolved gas sensors

The dataset contains hydrographic, biogeochemical and biological measurements of ocean and seabed sediment properties. Hydrographic profiles provided measurements of temperature, salinity, dissolved oxygen and fluorescence to accompany biogeochemical and biological samples, including concentrations of nutrients, particulate organic carbon (POC) and particulate organic nitrogen (PON). Emphasis was placed on the collection of benthic data, with numerous core samples being collected and analysed for pigments, biomarkers, lipids and other organic compounds. Samples were also collected and analysed for Holothurian species, while a large volume in situ filtration system was used to measure biogeochemical variables including POC and PON, and particulate iron. Station data were supplemented by continuous underway measurements of bathymetry, current velocities, sea surface salinity, temperature, fluorescence and beam attenuation across the survey area. These were accompanied by underway measurements of surface meteorological parameters including irradiance, air temperature, humidity, sea level pressure and wind velocities. The data were collected across the Crozet Plateau in the Southern Indian Ocean between 1st December 2005 and 14th January 2006 on RRS Discovery cruise D300. Data collection focused on four sites, with repeated hydrographic profiles, water and sediment samples collected at each location. In total, 89 instrumentation deployments were carried out at the four stations, including a conductivity-temperature-depth (CTD) package and a Megacorer (for sediment sampling). The underway system utilised a hull-mounted acoustic Doppler current profiler (ADCP) as well as a thermosalinograph and other standard surface hydrographic and meteorological instruments. Further data were collected using a variety of equipment including an otter trawl (net) and submersible cameras but these data are currently held by the data originators and are undergoing processing so are not included in the parameter and instrument lists above. The principal objective of Benthic CROZEX was to assess the manner in which biogeochemical composition and flux of organic matter to the deep-sea floor drives benthic community structure, dynamics and diversity at sites with contrasting primary production regimes. Investigators from British Antarctic Survey (BAS), Natural History Museum (NHM), National Oceanographic Centre (NOC) and the National University of Ireland, Galway (NUIG) were involved. Data management is being undertaken by the British Oceanographic Data Centre (BODC) but data processing is ongoing and various data are yet to be submitted to BODC.

Benthic CROZET project (2006) https://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/report/d300.pdf, Benthic CROZET project

British Oceanographic Data Centre
Joseph Proudman Building 6 Brownlow Street
Liverpool
Merseyside
L3 5DA
United Kingdom