1. Australian Antarctic Data Centre
2. Discover and Manage Data
3. Records
4. 199394010

Description

This dataset contains the underway data from Voyage 1 1993-94 (THIRST) of the Aurora Australis. This was a manned marine science voyage. DLS data types were logged at 10-second intervals. The observations were taken between August and October 1993 en route from Hobart to Macquarie Island to Heard Island and back to Hobart. See the Marine Science Support Programmer's and Data Quality Reports at the Related URL section.

XBT data were obtained on the legs to and from Hobart. CTD data were collected around Heard Island.

Also available is a scan of a printed plot of a section of the Voyage 1 1993/94 (THIRST) track in the Heard Island area, 28 August to 28 September 1993.

From the voyage leader's report:

Voyage 1 was the main biological research cruise for the 1993/94 season for Aurora Australis. Research was conducted in the region of Heard Island, and the main objectives were:

1) Deploy 6 personnel and their equipment at Macquarie Island.
2) A continuation of the survey of the distribution and abundance of demersal fish in shelf waters in the EEZ around Heard Island into a third season (Spring) after having completed previous surveys in Winter and Summer.
3) Studies on the zooplankton of the area.
4) Studies on the invertebrate benthos brought up in the trawls and on cephalopods by workers from the Victorian Museum.
5) Studies on the atmosphere/sea exchange of CO2 (Antarctic CRC).
6) Radiometric studies of the skin temperature of the ocean (Antarctic CRC).
7) Observations of seabirds at sea and sampling of some species for dietary studies.
8) XBT transects between Hobart and Macquarie Island and Hobart.
9) Trials of multiple cod-end (MIDOC) on the midwater trawl for mesopelagic fish sampling.
10) Deploy tide gauge at Atlas Cove.

The basic plan was to head straight for Macquarie Island with at most two stops for sampling of midwater fish, deploy the personnel and equipment at Buckles Bay and then head directly for Heard Island. Five weeks were scheduled in the vicinity of Heard Island, with the fish survey determining the vessel's route around the EEZ between the fishing sites, and the other scientific programmes would continue in "piggy back" fashion. The original fish sampling plan was to move round the sampling area in an anti-clockwise direction, starting at the island, and doing roughly half the planned stations in the two areas of high sampling density on Gunnari Ridge and Shell Bank. The balance of stations in these two areas would be completed on a second pass at the end of the sampling period, and we would depart for Hobart from Shell Bank. This would allows us maximum chance of covering the whole area, and spread the workload more evenly, as stations were close together and likely to produce large samples at Gunnari Ridge and Shell Bank. Although 30% of the available time was allowed for bad weather, this plan had to be extensively modified because the weather. After leaving the Heard Island vicinity, the ship would return direct to Hobart.

Quality

See the Marine Science Support Programmer's and Data Quality Reports at the Related URL section.

The data have been acquired at 0.1 Hz. There will be the occasional invalid value such as temperatures being out of range.

This dataset has not been checked. Please verify the data before use.

Where data for a particular sensor do not exist for a particular time, the last known value is used unless the sensor has been disabled or has encountered an error. For example, some sensors only record data every minute, but the resolution for the underway dataset is 10 seconds, so the same value will be used 6 times a minute. No averages are taken for sensors that capture data at a rate other than every 10 seconds. Instead, each record will be a snapshot of each sensor at that time.

Access

Data are available online via the AADC web page. A "supplementary" dataset is also available for download from the provided URL. It contains raw data collected directly from the ship, which has not been quality checked.

Reports from the voyage are also available for download.

Temporal Coverages

• Start date: 1993-08-07 - Stop date: 1993-10-09

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 > SEAFLOOR TOPOGRAPHY
• EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
• EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY
• EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE

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=199394010 when using these data.