1. Australian Antarctic Data Centre
2. Discover and Manage Data
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4. ADBEX_I_ocean

Description

This dataset contains CTD (conductivity, temperature, depth) and nutrient (nitrate, phosphate, silicate) data obtained from the Antarctic Division BIOMASS Experiment I (ADBEX I) cruise of the Nella Dan, during Nov - Dec 1982. This cruise is the second in a series of six, conducting a long term field survey of krill and other zooplankton. 79 CTD casts were taken in the Prydz Bay region, and nutrient data were collected at 28 out of the 79 CTD stations. Casts within the shelf zone were made to the bottom and down to 2000 m offshore. Oceanographic sampling was subordinate to other programs such as the phytoplankton survey, hence the locations of the CTD stations were not always ideal for oceanographic purposes. Nutrient samples were collected to provide information for the interpretation of phytoplankton distribution and abundance.

The fields in this dataset are:
Pressure
temperature
salinity
volume
geopotential
samples
deviation
conductivity

Quality

Oceanography and nutrient measurements were taken where possible, which was not always at ideal locations. Therefore coverage of the area is not necessarily complete. Nutrient data were only recorded at 28 out of the 79 CTD stations. This cruise is however part of a series of 6 cruises which operated in this area, providing data from varying seasons and condition.

Data collection: Two Neil Brown Mark III CTD (conductivity, temperature, depth probes #2568, #2941) systems attached to a rosette water sampler (General Oceanics) were used for collecting continuous vertical profiles of conductivity and temperature. Water samples were collect at different depths using the rosette water sampler with 5L Niskin bottles. Measurements were made on the downcast, and water samples collected on the upcast. The water sampling depths were determined depending on the readings made during the downcast. The CTD was lowered at a rate as close to 1 m/sec, and raised between samples at speeds between 1 and 2 m/sec. Conductivity and temperature readings were also made at each water sampling station. 79 CTD stations were taken in a grid rather than along transects. Transect sampling was impractical due to unconsolidated pack ice. Nutrient samples were taken at 28 of the CTD stations.

Ship-board processing: 250 mL water sub-samples were filtered through GF/F glass fibre filters, transferred to Whirlpacks and immediately frozen. Water samples were analysed on board the ship for salinity and oxygen. The complete dataset is logically consistent, as krill and zooplankton hauls and phytoplankton pigment analysis were also obtained at the same sampling sites as the oceanographic and nutrient data. The cruise track was established before the experiment in order to eliminate bias. The oceanographic sampling was done as a supplement to the krill research program and the nutrient sampling to help interpret phytoplankton distribution and abundance, so sampling location and depth were not necessarily selected according to oceanographic or nutrient related considerations.

Access

Data are available for download from the URL given below.

Temporal Coverages

• Start date: 1982-11-19 - Stop date: 1982-12-17

Spatial Coverages

Science Keywords

• EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > AIR TEMPERATURE
• EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR INDICATORS > HUMIDITY
• EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS
• EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > SOLAR RADIATION
• EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH
• EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN
• EARTH SCIENCE > OCEANS > OCEAN OPTICS > IRRADIANCE
• EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE
• EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY
• EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE
• EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS
• EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON
• EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON

Use Constraints

This data set conforms to the CCBY Attribution License
(http://creativecommons.org/licenses/by/4.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ADBEX_I_ocean when using these data.