Tealight....great image of the underlying bed topography and the minimum for last year. I believe this image holds the key to the future with regards to the retreat of the calving face. On the northern wall of the main ice stream we see two elevated areas of the underlying topography (in white) which are where the flow of the sheet slows down. In between, where the topography is considerably lower (in yellow), the ice moves rapidly towards the main ice stream. It is clear that this ice moving towards the main ice stream serves to pin the glacier and restrict calving along the northern edge. If the calving face ever retreats past this ice and into the deep trough behind it, we may then see a rapid retreat of the calving face south and then east.
I had the image lying around in a folder for 2-3weeks. but never managed to publish it. It is my first published bedrock overlay of Jakobshavn with correct mathematical scaling. Previously I just eyeballed it. Hard to say if it is more accurate, but at least it is more consistent. At the northern and southern shore the bedrock overlay shows 300m below sea level where it clearly isn't.
I attach another forgotten image from 18 July 2016 which shows the greater area and a bedrock legend.
Click for full resolution In the deeper parts we can at least expect a higher volume loss, but I don't know if the calving front retreats faster. After all the calving front cuts into a thick icesheet with ice supply from north, east and south. Previously it only had ice supply from the east.
Today is the one year anniversary of cloud free Sentinel 2A images of Jakobshavn. I plan to do some comparisons of
land ice retreat. Especially the ice free areas near the calving front which are used as control points.
@nukefix
Maybe there are some people who only follow certain users and not a whole thread.