Improve ice-ocean momentum coupling

[jchanut]

• With 1 m resolution at the ocean surface, matching log-law scaling leads to a 4-5 times increase of ice-ocean drag usually given at 5-10m depth. This often translates into a drastic decrease of the time step, ice-ocean interface being solved explicitly. We propose to implement an implicit formulation for ice-ocean drag. Momentum exchange won't be exact and the mismatch should be quantified but this may greatly improve the overall stability.
• TKE and GLS schemes assume turbulent kinetic injection below the ice-ocean interface which refers to the energy fluxed by breaking surface waves. However, away from marginal ice zones, wave energy nearly vanish so that this assumption is not valid. We propose to revert to a standard log-law boundary condition below sea ice, a situation well observed in the literature.

[jchanut]

In 12947:

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[jchanut]

In 12953:

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[jchanut]

In 12964:

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[jchanut]

In 12966:

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