Upernavik is another one of these upper west central glaciers that may be affected by an extensive field of basal upheavals just to the east. These features are fairly sparse along the coast and the distribution seems uncorrelated with overhead velocity (or anything else). Some areas, like the mammoth Hammond Glacier, appear completely free of anomalous basal regions.
The first image shows the available tracks, the thick blue one (20140509_01_046) is fairly central. Despite some new ones in 2014, Upernavik is unfavorable because of a lack of east-west crosstracks. The second image, adapted from RE Bell 2014, shows the known locations of basal features at the end of 2013. The right half of this image attempts to correlate the occurrence of these features with bedrock topography and paleo drainages.
The two matched animations show a sampler of other flight segments from 2014 exhibiting basal upheavals. Without a mission dedicated to mapping, the full extent of the feature will remain unknown. Many techniques have been applied to enhance visibility and features of the upheavals; there is no clear optimal method for doing this.
