This thing with marine cliff failure is you do not know it's about to manifest until it does? As we all know both P.I.G. and Thwaites are sat atop ridges that then rapidly fall away into the inland basin ( the ocean passage between east and west Antarctica once the ice goes?) so any new retreat ( not a natural calve but one pushing the grounding line further inland?) is likely to push us closer to the majik 100m max for ice cliff stability. If we do begin a Jakobshavn type collapse then it will progress far faster than we see on Greenland where tolerances are more slender And cliff heights more marginal?
Once the process begins it cannot be stopped until the basin is emptied. That is a lot of ice in a very short span of time.
2017, being another low max year when the ozone hole healed more than expected, looks to test the stability of all the remaining shelfs with early sea ice retreat meaning longer under the swells of a very busy southern Ocean. We will see what the ice behind the LarsenC calve does in response. If fohn melting along the surface has exploited crevasses , as we saw in LarsenB, then we could see rapid collapse of the remaining shelf there?
Just like 90,%+ of Greenland's ice sheet, the area in question is young. Past behavior clearly indicates at the appex of the Holocene, sea levels will be 10+M higher than present. It won't make any difference what CO2 emissions are, it is going to happen.
If you don't read the newspaper you are uninformed, if you do read the newspaper you are misinformed. -- Mark Twain