Herman, F., Anderson, B. & Leprince, S. Mountain
glacier velocity variation during a retreat / advance cycle quantified using sub-pixel analysis of ASTER images.
For instance, see Zwally et al (2002, Science, Vol 297) that showed clear evidence for
velocity variations at Swiss Camp (Greenland), with speed - ups in the summer that likely reflects increase basal motion in response to surface meltwater that can reach the
glacier bed.