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Sea-level changes due to Isostatics (ground rise or sink)

 
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Steve



Joined: 31 Oct 2004
Posts: 14
Location: Plymouth

PostPosted: Mon Nov 28, 2005 8:50 am    Post subject: Sea-level changes due to Isostatics (ground rise or sink) Reply with quote

Sea-level changes due to Isostatics (ground rise or sink)



Sea-level is measured relative to the sea shore (the tidal base measurements that the TideTables(UK) are based on, are taken from a meter set on the side of

Newlyn Harbour in Cornwall).
So, as measurements of sea-level are taken from land, the height is relevant to what is perceived. ie if the ground was sinking, the sea

would appear to be rising. This in fact is happening all over the planet and is known as isostatic changesb].

Land, when seen as a global item, is

merely the skin on the top of home made custard - if you press it in one area it will sink down at that point, but somewhere else will be rising up (if its not yer partner,

telling you to stop fiddling with yer food!)

[b]One example relevant to the UK area:

In the north west Europe area, we are in a post-glacial

period. The ice glaciers that were all over areas such as Scandinavia have, and still are melting and this gives rise to more water in the ocean basins = sea level

rise.
Something else is also occurring..... The weight of the ice has been taken off the land where the glaciers used to be, and this area of Scandinavia is rebounding

isostatically from the release of that ice loading.
The rebounding distance has outpaced the amount of the sea-level rise due to melt water, and so [relatively] the

sea level is falling in the area of sea around Scandinavia.

Just like the custard skin principle..... As Scandinavia is lifting due to presure down being released, it

should be noted that nearby (south west UK) is being dunked!
This, relative to real measured sea-level change, means that Scandinavia has a falling sea-level

change of around 5mm a year. South west UK has a rising sea-level change of around 2mm a year.

The land moves as well. Isostatic change.

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