Michael Tobis wrote:
> It strikes me that the large scale salinity gradients may require ice
> sheets, so that would put the age at only 3 million years. Before that
> it would mostly have been a thermal circulation.
Don't understand why one would think this. Locally, formation and
melting of (seasonal) sea ice is important, over the larger scale the
transport of evaporation/precipitation matters.
> I think it's safe to say that there has been a large scale circulation
> ever since there was an ocean. Fluids are like that.
Agreed.
James
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