All the PolarConnect events with Heidi Roop and the Ice Core Drilling team in Antarctica are now archived here.
What Are They Doing?
Using a large hollow drill, the WAIS Divide Ice Core Drilling team aimed to collect a 3,500-meter-long ice core, or sample of ice, from the West Antarctic Ice Sheet. Because of the weight of the overlying snowpack, snow that falls and accumulates on ice sheets re-crystallizes and forms annual layers over time. The ice core recovered during the project had annual resolution, or distinct yearly markings, for the past 40,000 years.
In ice sheets, the compression of snow traps small bubbles of air in the layers of ice. By measuring concentrations of greenhouse gasses and non-greenhouse gasses and their isotopes trapped within bubbles in the ice, the team aimed to develop climate records dating back to 100,000 years before present.
This ice core provided the first Southern Hemisphere climate and greenhouse gas records of comparable time, resolution, and duration to ice cores previously recovered in Greenland. The ice core enabled scientists to make detailed comparisons of greenhouse gas concentrations and environmental conditions between the Northern and Southern hemispheres with a greater level of detail than previously possible. The biology of the ice collected was also investigated.
Where Are They?
The research team was based at the West Antarctic Ice Sheet (WAIS) drill site, in western Antarctica. The WAIS divide sits on top of 3,485 meters of ice, thicker than nine Empire State Buildings stacked on top of one another! The WAIS is classified as a marine-based ice sheet, meaning that its bed lies well below sea level and its edges flow into floating ice shelves. The WAIS is bounded by the Ross Ice Shelf, the Ronne Ice Shelf, and outlet glaciers that drain into the Amundsen Sea.
Heidi Roop grew up exploring the formerly glaciated landscape of Wisconsin, and today continues her love for studying glaciers and climate variability through research in Antarctica and alpine regions around the world. Spending the austral summer of 2010-2011 in Antarctica, it will be her second season working as a part of the West Antarctic Ice Sheet (WAIS) Divide project. When she is not in Antarctica, she works throughout the Sierra Nevada studying climate variability and hydrology for the United States Geological Survey.