[MITgcm-support] [EXTERNAL] Ice not Moving when Resolution is Very High

Dimitris Menemenlis dmenemenlis at gmail.com
Fri Jan 17 12:50:19 EST 2020

Hey, for actual sea ice, wouldn’t you expect that for same surface wind and bottom stress,
the smaller floe would accelerate less because of relatively more “floe edge" drag?
But I don’t think that this effect is represented in pkg/seaice dynamics.

> On Jan 17, 2020, at 6:26 AM, Senja Walberg <senja.w at gmail.com> wrote:
> Hey Nils,
> thanks for the reply-- I believe your thesis may be useful regardless. However, and perhaps I should have been clearer in my first message, the floe I initialize should indeed be in free drift. It is an ice floe of size 25x18 grid cells, located in the centre of a 192x88 cell domain such that it doesn't touch any of the walls. 
> I've attached some movies showing my cases at 500m and 1km resolutions so you can see what I mean. The time format at the top is days:hours:minutes. Both cases are using constant windspeed of 6 m/s. 
> At resolutions higher than ~500m (not an exact bound, just an estimate) no motion is visible. 
> Note how in the 500m case the right bound of the initial floe remains static at A=1 even though ice moves past/off of it in much lower concentration. I'm not sure what to make of that but perhaps it's some clue.
> Regards and thanks,
> Senja
> <Icearea500m.mp4><Icearea1km.mp4>_______________________________________________
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