Description
Chairs:
Dr. Jakob Schwander and Dr. Kenji Kawamura
During EastGRIP season 2017 we observed a rapidly growing borehole inclination, which culminated at ≈ 5,5° in a depth of 550m. In order to correct for this inclination a leaf spring was mounted on the outer glass fiber core barrel, near the drill head of our 2-m core-barrel version of the Hans Tausen Drill to provide a sideways force as close to the cutters as possible. To rectify the...
Authors: Carson McAfee, Sean Quirk, Keith Makinson, Julius Rix, Paul Anker and Alex Brisbourne
Abstract:
A programmable borehole measurement system was deployed in hot water drilled ice holes during the BEAMISH project to drill to the bed of the Rutford Ice Stream in Antarctica. Capable of operating remotely, this system reached depths of 2150 meters and measured hole diameter, depth and...
Mass loss of ice shelf is of great significance to a better understanding of the ice sheet dynamics and a more precise prediction of global sea levels. However, the melting processes and ocean currents beneath the ice shelf remain poorly understood. The hot water drill, a highly efficient drill technique, provides an opportunity to investigate the physical and chemical processes beneath the...
To date, more than 400 relatively small subglacial reservoirs and several large lakes were discovered in Antarctica. Certainly subglacial lakes exist in Greenland. In recent years, different approaches were taken to access and directly sample subglacial water environments. RECoverable Autonomous Sonde (RECAS) allows to access subglacial lake when water remains isolated from the modern ice...
Core sampling from beneath Antarctic subglacial environments offers unique opportunities for examining processes acting of overlying ice. Basal aquatic sediment materials contain important paleo-climatic and paleo-environmental records even more than ice cores, provide unique habitat for life, give significant interactive information between ice bottom, subglacial hydraulic system and the...
Abstract
Much of the direct geological evidence for the instability of Antarctica’s ice sheets and shelves in past warmer climate regimes is now hidden beneath thick floating and grounded ice. The ANDRILL project showed the scientific rewards of deep geological drilling through the Ross Ice shelf, but was on a logistical (>250 tonnes of equipment) and financial (USD30M) scale that is not...
