Brief description
Oceanographic measurements were conducted in the Southern Ocean around Heard and McDonald Islands, and in the Prydz Bay region, from January 1992 to March 1992. A total of 168 CTD (conductivity, temperature and depth) vertical profile stations were taken, most to near bottom. Niskin bottle water samples were collected for the measurement of salinity, dissolved oxygen, nutrients (phosphate, nitrate+nitrite, silicate), chlorofluorocarbons, helium, tritium, dissolved inorganic carbon, alkalinity, carbon isotopes, dissolved organic carbon, dimethyl sulphide/dimethyl sulphoniopropionate, iodate/iodide, oxygen 18, primary productivity, and biological parameters, using a 24 bottle rosette sampler.CTD salinity data have been calibrated against bottle samples, although the calibration quality varies over the cruise. CTD salinity accuracies can be summarised as follows:
Stations 1-26: no bottle samples; conductivity calibration from later stations applied; accuracy therefore unknown.
Stations 27-102: accuracy approximately 0.005 (PSS78).
Stations 83-93: residuals a bit lower than surrounding stations: data uncertainty may be slightly increased.
Stations 103-111: no bottle samples; conductivity calibration from surrounding stations applied; accuracy therefore unknown.
Stations 112-168: significant increase in data scatter; accuracy approximately 0.010 (PSS78).
The bottle data file contains salinities and nutrients. Dissolved oxygen data exist only as titration values recorded on the laboratory analysis sheets. The nutrient data show a fair amount of scatter, particularly when looking at the nitrate vs phosphate ratios. These data should be used with caution.
Measurement and data processing techniques are described, and a summary of the data are presented in graphical and tabular form.
The fields in this dataset are:
oceanography
ship
station number
date
start time
bottom time
finish time
cruise
start position
bottom position
finish position
maximum position
bottom depth
pressure
temperature (T-90)
salinity
sigma-T
specific volume anomaly
geopotential anomaly
dissolved oxygen
fluorescence
photosynthetically active radiation
niskin bottle number
Lineage
Progress Code: completed
Statement: See data report.
Weather conditions were generally moderate, and there were few scientific equipment failures, allowing complete coverage of the areas surveyed. The oceanography program took place in three regions; Heard Island, the eastern flank of the Kerguelen Plateau, and Prydz Bay. Each region had specific objectives, please see the reference given above for these. 61 CTD stations were completed in the Heard Island region, and several XBT's were dropped between widely spaced stations. A number of XBT's were deployed between Heard Island and the Kerguelen Plateau section. The CTD section consisted of 14 CTD casts to the bottom, the deepest being 4850m. XBT's were deployed between the Kerguelen Plateau section and Prydz Bay. 93 CTD stations were occupied in the Prydz Bay region. 40 XBT's were dropped in the transit from Casey to Hobart. Please see the reference given above for further details. Logically consistent, salinity and temperature are measured simultaneously under the same conditions and depths.
Weather conditions were generally moderate, and there were few scientific equipment failures, allowing complete coverage of the areas surveyed. The oceanography program took place in three regions; Heard Island, the eastern flank of the Kerguelen Plateau, and Prydz Bay. Each region had specific objectives, please see the reference given above for these. 61 CTD stations were completed in the Heard Island region, and several XBT's were dropped between widely spaced stations. A number of XBT's were deployed between Heard Island and the Kerguelen Plateau section. The CTD section consisted of 14 CTD casts to the bottom, the deepest being 4850m. XBT's were deployed between the Kerguelen Plateau section and Prydz Bay. 93 CTD stations were occupied in the Prydz Bay region. 40 XBT's were dropped in the transit from Casey to Hobart. Please see the reference given above for further details. Logically consistent, salinity and temperature are measured simultaneously under the same conditions and depths.
Data time period: 1992-01-09 to 1992-03-27
text: westlimit=65; southlimit=-69.0; eastlimit=89; northlimit=-51.0
Subjects
ACE/CRC |
AMD |
AMD/AU |
BOTTOM DEPTH |
BOTTOM POSITION |
BOTTOM TIME |
CEOS |
CONTINENT > ANTARCTICA |
CRUISE |
CTD > Conductivity, Temperature, Depth |
DATE |
DISSOLVED OXYGEN |
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA |
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > DISSOLVED GASES |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC CARBON |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE |
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > STABLE ISOTOPES |
EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE |
EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY |
EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY |
FINISH POSITION |
FINISH TIME |
FLUORESCENCE |
GEOGRAPHIC REGION > POLAR |
GEOPOTENTIAL ANOMALY |
MAXIMUM POSITION |
NISKIN BOTTLE NUMBER |
OCEAN > SOUTHERN OCEAN |
OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS |
OCEANOGRAPHY |
PHOTOSYNTHETICALLY ACTIVE RADIATION |
PRESSURE |
R/V AA > R/V Aurora Australis |
SALINITY |
SHIP |
SHIPS |
SIGMA-T |
SPECIFIC VOLUME ANOMALY |
START POSITION |
START TIME |
STATION NUMBER |
TEMPERATURE (T-90) |
XBT > Expendable Bathythermographs |
biota |
elevation |
geoscientificInformation |
oceans |
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