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Responding to Frank's posting, Marc Bernstein wrote-

| Sea level rise may appear linear but that does not mean that the
| increase in volume of the oceans is linear.

Yes, it does. Increase in ocean volume, over a very wide range, will
be very precisely proportional to rise in sea-level. Not until the
level has changed so much as to make a noticeable difference to the
overall AREA of the oceans will there be the slightest departure from
linearity.

===================

Frank wrote-

| > Tide gauge data  --available online-- shows a linear increase in
sea level
| > over the past 150  years. For example, here's the historical tide
gauge data for
| > The Battery in  southern  Manhattan:
| >
http://tidesandcurrents.noaa.gov/sltrends/sltrends_station.shtml?stnid=8518750

Here, I think that Frank was being somewhat over-simplistic in
relating change in overall sea level to one location, even as an
example.

Such local changes respond not only to change in sea level, but also
to changes in land level, which can be rising or falling.

For example, even within the limited extent of the geology of the UK,
although in some parts of the coast sea levels are rising, in others
they are falling. By choosing your location, you could make whatever
predictions you thought fit.

I am not knowledgeable about American geology, but understand that
even something as solid and massive as the Laurentian shield is still
recovering, rising and tilting, after release from the enormous
overburden of the ice ages, comparatively recent in geological terms.
Which has given rise to the changes in drainage of the Great Lakes
basin, once having been via the Mississippi, then the Hudson, now the
St Laurence.

However, I would not disagree with the point Frank was making.

George.

contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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