Asked by Rose
Hello, I came upon ur topics about Ice velocity, I have a question regarding it. So what would be the difference between the ice velocity of Glacier during summer and winter? considering the velocity for the top and bottom of the glacier? am I correct that summer would be faster and basal sliding would happen first? Would highly appreciate for ur answer!
Thank you for your question Rose! Glacier velocity is a function of several things: ice surface slope, ice thickness, and slipperiness at the base of the glacier. Ice velocity can therefore be quite variable along and across a glacier, with ice at the sides typically flowing more slowly, and ice flowing fastest at the centre, where ice is thickest.
In temperate regions with a distinct summer and winter season, there can be a lot more melt in the summer. This means that there is more meltwater reaching the base of the glacier in the summer. Glaciers of this type (such as Alpine glaciers) may flow faster in the summer, as there is less friction and the ice is more slippery. We also see this for the outlet glaciers around the edge of the Greenland Ice Sheet.
Best wishes
Bethan