Time-lapse photography yields new insights into Greenland outlet glacier dynamics (Invited)

The dynamic nature of fast-flowing outlet glaciers in Greenland poses a challenge to traditional methods of investigation, such as in situ GPS observations (limited spatial coverage) and satellite remote sensing (low temporal resolution). While we have applied both approaches with great success in our study of Helheim Glacier in East Greenland, the addition of a repeat photography component to our project has provided unique insights into several key glaciological processes. Off-the-shelf time-lapse cameras were deployed at three sites overlooking the glacier terminus for ∼2-month periods during the summers of 2008 and 2010, and collected images at intervals ranging from 4-30 minutes. The time series of photographs are especially useful for elucidating details of the timing and style of mega-scale iceberg calving events, understanding short-term variability in the advance and retreat of the terminus, and examining some of the mechanical properties of the iceberg melange in front of the terminus. We will describe, with examples, how repeat photography in combination with other observations has enhanced our understanding of the glacier’s dynamic behavior.