Bitter laughter
The calving front has receded so far that today's Sentinel1 image no longer gives any information. Attached last image
Personal Calving Analysis :
1) FredBear, I completely agree with what you're saying. The CDW goes in deep and to the north and after melting the shelf on the grounding line comes out below the ice shelf (with some residual melting in passing) to the south. This water is less dense and tends to rise and enlarge existing fractures if possible. Moreover it is this action that explains the explosive widening of the whole fracture system in the last few months and the final increment in the speed of the southern edge of the calving line already observed in November (more than 6km per year, even with the action of the cork).
2) Concerning the calving I find that there have been mainly three places where there has been a relaxation of tensions:
a. North: abrupt opening of two fractures extending an existing fracture to the south and north, respective lengths: 2.5 km and 1 km.
b. South: opening of a much shorter fracture (200m)
c. In the center: opening of the two fractures north and south of the ridge already indicated in my previous posts (it is the cigar that was isolated in the center and later divided into three pieces). These fractures are very long: 8km each.
Since the energies released depend on the conditions we do not control (what are the current tensions? is the ice already partially fractured? etc.) we cannot make relative evaluations. Nevertheless these energies are the product of the energy per unit length multiplied by the length of the fracture. We can therefore assume that the energy has been released especially in the centre and north.
As regards their release I think that the first one triggered a shock (earthquake) which propagated to the whole iceberg by triggering the whole rupture. The calving must have been, in my opinion, very brutal and very fast (between one rupture and the other the interval being very short).
3) Currents: in addition to the current exiting to the south (see point 2) there is a clockwise current flowing in front of the calving line. This current has reorganized itself very quickly as it moves up to the new calving line. The two currents: outgoing and circulatory, explain the movements that occur after calving.
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