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George Huxtable wrote:

>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.
>
>

That's where measurements from satellites come in. (e.g. google
TOPEX/POSEIDON.) They directly indicate actual sea levels, but we have
them only for the last decade, or so.  Long term tide gauge data and
short term altimetric satellite data can be used to calibrate each other
and they seem to confirm each other.

>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.
>
>

Yes, and that's also confirmed world wide by satellite data, even for
places in the middle of the ocean. But the global trend has been a
linear increase of 2-3 mm / year.


Herbert Prinz

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