On 10/1/07, James Annan <[EMAIL PROTECTED]> wrote:
>
> 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.
Oops. Silly me. Correction accepted.
While I was presuming no sea ice as well without saying so, even if
there were no land or sea ice there would still be salinity gradients
due to precip and evap.
mt
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