Abstract:
Glaciers of the Dry Valleys occur where snow accumulation gains exceed sublimation and other losses. Monitoring of the mass balance of glaciers in the Dry Valleys was conducted from the 1969/70 summer until the 1990/91 season. The data was used to contribute to the understanding of the mass balance of the glacier-river-lake systems in the Dry Valleys because these fluctuations are indicators of ... climate change in this part of Antarctica. Mass balances, ablation and other measurements were measured since 1969 on several glaciers within the Dry Valleys including the Sykes, Alberich, Heimdall, Upper Wright, Lower Wright, Clarke, Meserve, Bartley, Hart, Goodspeed, Denton and the Wilson Piedmont Glaciers in the Wright Valley, the Upper Victoria, Lower Victoria and Packard Glaciers in the Victoria Valley, the Upper Taylor, La Croix, Suess, Canada and Commonwealth Glaciers in the Taylor Valley and the Miers and Adams Glaciers in the Miers Valley. Not all measurements were made at each glacier in each season. Arrays of stakes were re-measured both at the beginning and at the end of the season for glacier mass balance figures. Sufficient information was collected to calculate a winter balance, summer balance and annual net balance. Different glacier margins were recognised, varying from snow aprons to calving cliffs. Based on a hypothesis that the type of margin may indicate the state of balance of the glacier, flow and strain rates and ablation measurements were made on some glaciers. Photo-theodolite photos were taken of several glaciers on a 1, 2, 5, 10 year basis for mapping and ice movement purposes. (Detailed mapping is beyond the scope of this equipment and in view of the small glacier fluctuations which occur here over lengthy time periods, these measurements will be of a qualitative rather than quantitative form.) Fixed benchmark photography of the glacier termini of several glaciers was completed. Ice cliff distance and height were measured on the Goodspeed, Hart, Meserve and Bartley Glaciers. In the 1980/81 season, where the Lower Wright Glacier enters Lake Brownworth, and the Taylor Glacier enters Lake Bonney, a number of ice samples were taken. Photos of ice crystals taken from samples will be studied to determine the position and formations present, where glacier ice meets the permanent lake ice. In the 1983/84 season, sites were installed and measurements taken to establish the cliff heights of points on the Lower Wright, Upper Wright, Clarke, Victoria, Meserve and Bartley Glacier margins. Sequences of glacier margin photographs taken from fixed points were repeated at the Lower Wright, Meserve and Heimdall Glaciers for comparison with previously taken sequences to determine glacier margin changes.
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
N: -77.25
S: -78.25
E: 164.0
W: 160.0
Parent DIF
This data set description is a member of a collection. The
collection is described in
K161_1969_1991_NZ_1
