Into the ice: Exploration and science on the Greenland Ice Sheet

10 november, 2021 @ 17:10 – 18:30

Predava: Matt Covington

Lokacija: Filozofska fakulteta, Oddelek za geografijo, predavalnica 232 (Ljubljana, Aškerčeva cesta 2, 2. nadstropje levo)

Predavanje bo v angleškem jeziku, ključne informacije predavanja je mogoče dobiti tudi v slovenskem jeziku. Za vstop na Filozofsko fakulteto je potrebno izpolnjevati pogoj PCT.

Most of the meltwater on the surface of the Greenland Ice Sheet flows in rivers and streams that eventually end in moulins, which are holes in the ice that carry the water to the bottom of the glacier. Once meltwater is beneath the ice, it can lubricate the bottom of the ice sheet, lift up the ice, and cause the ice to slide faster. This may create a double effect, where future increases in melting of the ice during warmer climate may also cause faster sliding and more loss of ice into the sea. However, these processes are not well understood. During a three-year project, we conducted two summer field expeditions, where we measured meltwater and water levels inside of moulins. In the last two years of the project, we also conducted two fall expeditions, where we directly explored inside of moulins using a mix of caving and ice climbing techniques. In our work, we found that moulin volumes can be much larger than previously thought. These large volumes can store melt water and reduce daily fluctuations in water levels, having important implications for the relationships between meltwater routing beneath the ice sheet and ice sliding velocities.