Antarctica for day 2️⃣ 5️⃣ of #30DayMapChallenge :...

Antarctica for day 2️⃣ 5️⃣ of #30DayMapChallenge : a fanciful conjecture based on NISDC bedrock data. Subsidiary title should read "nor isostatic rebound nor sea level rise".

A map of Antarctica centred on the S pole with the ice stipped off, and shaded hypsometrically according to height of bedrock above current sea level

Like 25 Nov 2023 at 21:32 | Open on en.osm.town

5 comments

Gonéri

@SK53 nor gravitationnal and rotational effects due to ice sheet mass loss!

25 Nov 2023 at 22:10 | Open on mamot.fr

SK53

@Goneri well I think I can crudely approximate the first two, but not the others

25 Nov 2023 at 22:28 | Open on en.osm.town

Brendan Jones

@SK53 @atthenius Is it without ice really such an archipelago at current sea levels? I had always assumed it was a bit more … solid.

25 Nov 2023 at 22:57 | Open on fosstodon.org

legraLeGra

@Brendanjones @SK53

The grounding line in many spots in Antarctica is below sea level: scary :-/

But, given enough time (millennia), the land would ‘rise’ w/o the load of ice on top of it (isostatic rebound*)… but, w/o that ice-load, seas would be 50’s meters-ish higher.

Isostatic rebound: think about it like continents floating on a sea of mantle (so they must have keels)… and ice sheets are like huge foam blocks on top, pushing the whole boat below ‘surface’. That’ll rebound in time.

25 Nov 2023 at 23:07 | Open on fediscience.org

Brendan Jones

@atthenius @SK53 very cool (the concepts, not the sea level rise), thanks for the explanation.

26 Nov 2023 at 12:19 | Open on fosstodon.org