The Lambert Glacier Basin (LGB) series of five oversnow traverses were conducted from 1989-95. Snow accumulation rate measurements were recorded every 2 km along the 2014 km 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 7 selected sites around the basin where local accumulation cane farm gridded arrays were established.
Raw data were manually recorded in field logbooks and later entered into spreadsheet files (MS Excel).
Summary data (2 km spatial resolution) 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 regenerated from the raw data (also provided).
The fields in this dataset are:
Latitude Longitude Height Cane Distance Elevation Density Mass Accumulation Year Delta Oxygen-18 Grain Size Ice Crusts Depth Hoar
All logbooks have been archived at the Australian Antarctic Division.
Copies of the document details forms for the logbooks is available for download from the provided URL.
Download point for the data
Very few data gaps appeared in almost 1000 accumulation rate measurements along the 2014 km of traverse track, those that did occur were simply due to breakage loss of canes caused by the strong plateau winds. Snow accumulation data were obtained using an extensible tape measure to record the heights above the snow surface of the tops of bamboo accumulation-navigation canes and pairs of aluminium marker tags attached to them. Three measurements allowed a level of redundancy to compensate for cases where either the lower marker became buried beneath the snow surface, or one or other marker shifted with respect to the cane due to vibration in the continual plateau winds. Time, date, and geographic location were also recorded. At seven (7) selected sites around the basin, usually coinciding with locations of automatic weather station (AWS) installations, gridded arrays of accumulation canes were established to investigate the spatial variability of the local surface microrelief (sastrugi, dunes, ....). To convert snow layer thicknesses to annual surface accumulation rates densities were recorded, either as 1 m averaged values over the top metre of a 2 m shallow core (taken for oxygen isotope measurements), or from an 0.5 litre cylinder inserted horizontally into the firn some 10-20 cm below the snow surface. Accumulation canes have been measured every time a portion of the track has been established and revisited. Several annual cycles have been recorded throughout the program exhibiting broad agreement in accumulation trends around the basin. Geographic locations for which snow accumulation rates applied were navigational GPS (30-100 m accuracy) constrained to overnight LGB station geodetic GPS fixes (1-5 m horizontal) every 30 km along the traverse route. Since snow surface accumulation rates were in general only meaningful over large distances (30 km smoothing has been applied), any such minor inaccuracies in geographical positioning were largely irrelevant.