111 stations covering the Southern Indian Ocean/Southern Ocean in the region of the Crozet Plateau. (Data set limits -49 to -42 deg. N; 44 deg. E to 56 deg. E.)

Atmospheric particulates; Bacteria taxonomic abundance in water bodies; Air pressure; Sediment lipid concentrations; Air temperature; Atmospheric humidity; Particulate inorganic carbon concentrations in the water column; Variable fluorescence parameters; Electrical conductivity of the water column; Particulate total and organic carbon concentrations in the water column; Precipitation and evaporation; Chlorophyll pigment concentrations in sediment; Chlorophyll pigment concentrations in water bodies; Dissolved oxygen parameters in the water column; Wind strength and direction; Raw fluorometer output; Zooplankton gut pigments; Vertical velocity of the water column (currents); Sedimentation flux of metallic and metalloid elements and isotopes in water bodies; Sediment grain size parameters; Particulate metal concentrations in the water column; Particulate total and organic nitrogen concentrations in the water column; Nitrate concentration parameters in the water column; Phytoplankton taxonomic abundance in water bodies; Partial pressure (pCO2) and fugacity (fCO2) of carbon dioxide in the water column; Phosphate concentration parameters in the water column; Primary production in the water column; Salinity of the water column; Horizontal velocity of the water column (currents); Nutrient fluxes between the bed and the water column; Metal fluxes between the bed and the water column; Other fluxes between the bed and the water column; Radioactivity in water bodies; Zooplankton taxonomy-related abundance per unit volume of the water column; Phaeopigment concentrations in the water column; Phytoplankton generic abundance in water bodies; Concentration of inorganic sulphur species in sediment; Zooplankton and zoobenthos development stage parameters; Sedimentation flux of carbon, nitrogen or organic matter in the water column; Total dissolved inorganic carbon (TCO2) concentration in the water column; Alkalinity, acidity and pH of the water column; Heat fluxes between the water column and the atmosphere; Dissolved trace metalloid and inorganic selenium concentrations in water bodies; Particulate trace metalloid and inorganic selenium concentrations in water bodies; Transmittance and attenuance of the water column; Sedimentation flux of pigments in the water column; Silicate concentration parameters in the water column; Long-wave radiation; Bathymetry and Elevation; Carotenoid and flavenoid pigment concentrations in water bodies; Carotenoid pigment concentrations in sediment; Phytoplankton taxonomic biomass in water bodies; Water body lipid concentrations; Fauna abundance per unit area of the bed; Temperature of the water column; Inorganic chemical composition of sediment or rocks; Gas fluxes between the water column and the atmosphere

Meteorological packages; fluorometers; current meters; radiometers; optical backscatter sensors; plankton recorders; plankton nets; discrete water samplers; continuous water samplers; particulates samplers; unconsolidated sediment corers; elemental analysers; bench particle sizers; CTD undulators; transmissometers; CTD; current profilers; dissolved gas sensors; shipboard incubators

The dataset contains physical, biogeochemical and biological data, including measurements of water temperature, salinity, fluorescence, dissolved gases and current velocities; plankton samples from nets and plankton recorders; water samples for analysis of nutrients, phytoplankton, radioactivity and biogeochemical parameters; benthic cores; meteorological time series (pressure, temperature, humidity, wind velocities); atmospheric samples and ocean-atmosphere fluxes; and results from incubation experiments. The data were collected north of the Crozet Plateau in the Southern Ocean/Southwest Indian Ocean on RRS Discovery cruises D285 (3rd November - 10th December 2004) and D286 (13th December 2004 - 21st January 2005). Much of the data collection focussed on a series of Major Stations (called M1 to M10), with measurements being collected at these stations every two or three days. Conductivity-temperature-depth (CTD) casts were undertaken at each station, providing both hydrographic data and water samples from a range of depths. Other work at each Major Station included zooplankton nets, Longhurst-Hardy Plankton Recorder (LHPR) tows, sediment coring and Argo float deployment. In between Major Stations some additional CTD casts were undertaken. The SeaSoar oceanographic undulator provided further hydrographic data, while hull-mounted acoustic Doppler current profilers (ADCPs) provided current velocity data across the survey area. In addition, continuous underway measurements of hydrographic and meteorological parameters and surface water samples were collected along the cruise track. Five moorings were deployed, one of which was recovered at the end of D286. The other four, including sediment traps, current profilers and CTDs were deployed for one year. CROZEX (CROZet circulation, iron fertilization and Export production experiment) is a complex, multidisciplinary project to examine, from surface to sediment, the structure, causes and consequences of a naturally occurring annual phytoplankton bloom that forms. This collaborative project involved researchers in Ireland and the UK, and was administered by the National Oceanography Centre (NOC), Southampton. Data are managed by the British Oceanographic Data Centre. Much of the CROZEX data processing is ongoing and a number of datasets have yet to be submitted to BODC. The data described here are those presently held by BODC, with the exception of the Argo floats (these data are not expected by BODC and should be accessible via the Argo website) and the four year-long mooring deployments (data from these will be submitted to BODC in the future).

CROZEX project (2006) http://www.bodc.ac.uk/data/information_and_inventories/cruise_inventory/report/d285_d286crozex.pdf, CROZEX project

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