[Location: Location_Category='CONTINENT', Location_Type='ANTARCTICA', Detailed_Location='Vestfold Hills']
Bathymetric data of Long and Tryne Fjords at Vestfold Hills, Antarctica, collected in December 1999Entry ID: VH_bathy_99
Abstract: This dataset contains 102 depth measurements of the water column in Long and Tryne fjords, which are in the northern Vestfold Hills, Prydz Bay, Antarctica. Sea ice thickness and snow thickness were recorded simultaneously. The motivation for this project has been to yield a description of the pupping and moulting habitat of Weddell seals. This information will assist the interpretation of 25+ ... years of data on seal distribution within that area.
Our data were collected between 7th and 13th December 1999. The measurement sites were chosen according to geographical features; their exact location was determined by GPS with an accuracy of about 25m. At each site a 5cm diameter hole was drilled through the sea ice and a weighted measurement tape was lowered through the ice-hole to the bottom. Water depths were measured to the nearest centimetre; ice and snow thicknesses were measured to the nearest millimetre. A minimum depth of less than 3m was found in a narrow channel between small islands immediately west of Shirokaya Bay. The maximum depth of the water column was 222m in the middle basin of Long Fjord. The tidal range for the measured days was less than 0.5m, with tidal corrections applied to the raw data. Water samples were taken in Breid Basin and the middle basin of Long Fjord. These and water samples taken in Snezhnyy Bay [pers. comm. J. Laynourne Parry, 1999] show aerobic and relatively fresh water for all upper basins. This indicates that even the far basins of both fjords are well mixed despite the drainage of large volumes meltwater from the Antarctic plateau into the fjords.
See related URL for data and a spatial summary of the data.
See Entry: long_tryne_bathy for an interpolation of bathymetry made using the Topogrid command within the ArcInfo GIS software, version 8.0.2. Coastline and spot height (heights above sea level) data, extracted from the Australian Antarctic Data Centre's Vestfold Hills topographic GIS dataset (see Entry: vest_hills_gis), was also used as input data to optimise the interpolation close to the coastline.
The fields in this dataset are:
(Click for Interactive Map)
Start Date: 1999-12-07Stop Date: 1999-12-13
Quality Depth measurements were made by 10kg, 3cm diametre x 50 cm long cylindrical weight on thin static rope. The effect of current on the rope appeared to be minimal. In places the bottom was muddy and the weight may have sunk into the substrate giving measurements a possible error of +/- 50 cm.
Access Constraints See the investigator for details
Use Constraints This data set conforms to the PICCCBY Attribution License
Data Set Progress
Role: DIF AUTHOR
Phone: +64 3 473 9002
Email: se_lake at utas.edu.au
Dunedin 7 Pentland Street
Country: New Zealand
Phone: +61 3 6226 7646
Fax: +61 3 6226 7650
Email: petra.heil at utas.edu.au
Antarctic CRC GPO Box 252 - 80 University of Tasmania
Province or State: Tasmania
Postal Code: 7001
Creation and Review Dates
DIF Creation Date: 2000-03-23
Last DIF Revision Date: 2008-04-10