Abstract:
The Lambert Glacier Basin (LGB) series of five oversnow traverses were conducted from 1989-95. Several shallow depth ice cores (15-60 m) were drilled at selected sites along 2014 km of the main traverse track from LGB00 (68.6543 S, 61.1201 E) near Mawson Station to LGB72 (69.9209 S,76.4933 E) near Davis Station, and at selected sites along a western traverse line from LGB00 toward Enderby Land. Surface cores (2 m) were collected at 30 km intervals along the entire route from LGB00-LGB72.
Ice cores have been kept in cool storage at a local cold room storage facility. Isotope data from the cores have been saved in various spreadsheet files (mainly MS Excel).
Initial summary data can be obtained from CRC Research Note No.09 &Surface mass balance and snow surface properties from the Lambert Glacier Basin Traverses 1990-94&.
This work was completed as part of ASAC projects 3 and 2216.
Some of this data have been stored in a very old format. The majority of files have been updated to current formats, but some files (kaleidograph files in particular) were not able to be modified due to a lack of appropriate software. However, these files are simply figures, and can be regernerated from the raw data (also provided).
The fields in this dataset are:
Latitutde Longitude Height Cane Distance Elevation Density Mass Accumulation Year Delta Oxygen-18 Grain Size Ice Crusts Depth Hoar
Not all ratios have yet been measured for all cores. Shallow ice cores to a depth of 2-15 m (70-80 mm diameter) were hand drilled with the Polar Ice Coring Office (PICO) lightweight fibreglass drill. Deeper cores, 20-60 m, (75-92 mm diameter) were obtained with the use of an in-house designed and built electromechanical (Wehrle) drill. Cores were generally logged for density, stratigraphy, grain size and electrical conductivity on site in the field, then bagged for return to Australia andsubsequent logging of oxygen isotope ratios and selected chemical species analysis. Oxygen isotope ratios were determined by standard small quantity mass spectrometric techniques. Geographic positions for shallow ice core drilling sites (2-60 m) were given as LGB station geodetic GPS survey fixes (1-5 m horizontal). Actual corelocations were generally some 50-200 m from the survey points; any such minor inaccuracies in geographical positioning were largely irrelevant.
