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Defence Evaluation Research Agency

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  • The dataset comprises 71 hydrographic data profiles, collected by a conductivity-temperature-depth (CTD) sensor package, from across the Malin shelf-edge, on the North-West UK shelf margin area specifically on the shelf edge just east of the Hebrides Seamount. The data were collected during July and August 1996. A complete list of all data parameters are described by the SeaDataNet Parameter Discovery Vocabulary (PDV) keywords assigned in this metadata record. The data were collected by the Defence Evaluation and Research Agency Winfrith as part of the Shelf Edge Studies Acoustic Measurement Experiment (SESAME).

  • The dataset comprises 122 hydrographic data profiles, collected by a conductivity-temperature-depth (CTD) sensor package, made in the NE Atlantic specifically NE of Penmarc' h Canyon, during July 1998. A complete list of all data parameters are described by the SeaDataNet Parameter Discovery Vocabulary (PDV) keywords assigned in this metadata record. The data were collected by the Defence Evaluation and Research Agency Winfrith.

  • The dataset comprises 31 hydrographic data profiles, collected by a conductivity-temperature-depth (CTD) sensor package, from on the Malin shelf-edge, on the North-West UK shelf margin area specifically tho the north east of the Hebrides Seamount, during August and September 1995. A complete list of all data parameters are described by the SeaDataNet Parameter Discovery Vocabulary (PDV) keywords assigned in this metadata record. The data were collected by the Defence Evaluation and Research Agency Winfrith as part of the Shelf Edge Studies Acoustic Measurement Experiment (SESAME).

  • The dataset comprises 34 hydrographic data profiles, collected by a conductivity-temperature-depth (CTD) sensor package, from the West Inner Seas off the West Coast of Scotland and the North East Atlantic Ocean area specifically East of Barra Fan, taken during September 1995. A complete list of all data parameters are described by the SeaDataNet Parameter Discovery Vocabulary (PDV) keywords assigned in this metadata record. The data were collected by the Defence Evaluation and Research Agency Winfrith as part of the Shelf Edge Studies Acoustic Measurement Experiment (SESAME).

  • The dataset comprises physical, biogeochemical and biological measurements of water column properties. Hydrographic profiles of water temperature, salinity, fluorescence, turbidity, attenuance, dissolved oxygen and photosynthetically active radiation were collected, and were supplemented by measurements of surface ocean (temperature, salinity, fluorescence, attenuance) and meteorological (air pressure, air temperature, humidity, wind, irradiance) properties, as well as bathymetry. A comprehensive water sampling program provided biogeochemical data including measurements of dimethyl sulphide (DMS), dimethylsulphionopropionate (DMSP), nutrients, halocarbons, methylamines, pigments, radiogeochemistry and dissolved organic carbon (DOC). Biological data were also collected, including samples of viruses, bacteria, phytoplankton, micro- and mesozooplankton. Currents throughout the water column were measured both at fixed locations and across the study area, while Lagrangian experiments provided further current data. The datqa were collected in the northern North Sea between 5th June 1999 and 1st July 1999 during RRS Discovery cruise D241. Hydrographic profiles were collected using a conductivity-temperature-depth (CTD) package with attached auxiliary sensors, an undulating oceanographic recorder (UOR), a vessel-mounted acoustic Doppler current profiler (ADCP), moored ADCP and temperature sensors, and a suite of standard underway hydrographic and meteorological sensors. Water samples for biogeochemical and biological analyses were collected from both the underway system and CTD bottles, while nets were deployed to collect zooplankton samples. Plankton samples were supplemented by respiration experiments conducted during the cruise. The Lagrangian current data were gathered from four drifters and a tracer experiment where the distribution of sulphur hexafluoride (SF6) released from the ship was monitored via water samples collected from the CTD and the underway system. A survey of the region was carried out in order to locate an Emiliania huxleyi bloom suitable for the study and the chosen bloom was labelled with the SF6 tracer. The biogeochemical process study followed the patch as it drifted in a SE direction and was eventually subducted under Norweigian coastal water on 26 June. The study aimed to investigate DMS biogeochemistry within a coccolithophore bloom. The research was organised by NERC's Plymouth Marine Laboratory and involved the University of East Anglia, Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Marine Biological Association, Defence Research Agency, and Southampton Oceanography Centre. Data management support for the project is provided by the British Oceanographic Data Centre (BODC). The dataset is available on CD-ROM and can be requested from BODC.

  • The data set includes hydrographic profiles (including temperature, salinity, attenuance, chlorophyll, oxygen, irradiance, turbulence, sound velocity and currents), hydrographic time series (temperature, currents, fluorescence, bottom pressure), water samples (>70 parameters measured), sediment samples (>160 parameters measured), sediment trap samples (>10 parameters measured), production experiments and marine snow camera profiles. Additional meteorological and wave records are also available, as well as satellite imagery and underwater photography (water column and seabed). The data were collected on the Hebridean Slope (NW of Ireland) between March 1995 and September 1996. Measurements were collected via a combination of shipboard instrument deployments, including >1,800 conductivity-temperature-depth (CTD) and SeaSoar (undulating oceanographic recorder) profiles, >100 expendable bathythermograph (XBT) profiles, >38,000 acoustic Doppler current profiler (ADCP) profiles, >35 core profiles, >800 turbulence profiles, >40 marine snow camera profiles, >55 radiometer profiles and >25 sound velocity and travel time experiments. Benthic lander deployments were also undertaken, along with shipboard incubation experiments and drifting buoy deployments (48 tracks). An intensive water sampling programme provided >2,500 samples for biological and biogeochemical analysis. An extensive moored instrument array was maintained throughout the experiment, including sediment traps, recording current meters (104 series), electromagnetic current meters (9 series), ADCPs (16 series), thermistor chain and temperature probes (70 series), fluorometers (18 series), transmissometers (16 series), light meter (5 series), bottom pressure recorders (11 series), plus one waverider buoy series and three meteorological buoy time series. The Shelf Edge Study (SES) was an intensive multidisciplinary experiment and formed part of the NERC Land Ocean Interaction Study. The British Oceanographic Data Centre (BODC) assembled over 95% of the data sets collected during SES into its project database system. Once basic quality control procedures had been completed the data set was published, complete with extensive data documentation, on CD-ROM.