[NatureNS] Determining Elevation

Date: Wed, 07 Mar 2007 17:22:32 -0400
From: Gerald Ruderman <naturens@zdoit.airpost.net>
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Steve,

http://pubs.usgs.gov/gip/continents/map.jpg shows NS covered by ice
during the recent ice age and Baltimore exposed. I wonder how thick the
ice was here. I recall reading it was over 6 000 feet deep in New Hampshire.

Gerald

Steve Shaw wrote:
>   For detailed discussion of land sinking/rising, and of determining
> actual mean sea level (MSL) changes over time as a result of
> measurements that largely originate from multiple tide gauges, try this
> (1995) review:
> 
> http://www.agu.org/revgeophys/dougla01/node3.html
> 
>   According to this site, local sea level is rising rapidly by 3.5 mm
> per year near Baltimore because the local land is sinking. Because of a
> sort of amplification effect explained in the article, a change of 1 mm
> can result in devastating effects 50-200 times larger, as has happened
> in nearby Chesapeake Bay.   Oppositely, local sea level is falling
> rapidly by 4 mm per year at Stockholm because of continuing post-glacial
> rebound (the land is rising after a heavy ice-age load).   Nothing is
> mentioned in the article on the situation further north from Baltimore
> in NS, but presumably NS is more like Sweden.
>   The more reliable tide gauge data are said to indicate a rise of 1.8
> mm per year in MSL, averaged worldwide.  At least in 1995, this guy
> seemed to think this rate of rise was not obviously accelerating, but I
> suspect that this conclusion may be out of date.
> 

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