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

[Dimitris Menemenlis]

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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