Paul Homewood has some good insight on the sea level issue. Actually he has a lot of insight on a lot of issues. It provides a clarification of what is actually being done. I tongue in cheek of Cliff Ollier of Australia the other day if any of these folks believe that reducing CO2 would change the subsidence portion of SLR. We got a good laugh.
By Paul Homewood
Some comments on Tuesday’s post, UCS Forget To Mention Subsidence, made me wonder if there is a bit of confusion around about sea level changes.
So a quick recap on the basics, and clarification about some of the terminology used. ( Pardon, if I am stating the obvious).
There is a worldwide network of tidal gauges, from which measurements are collated by the PSMSL, Permanent Service for Mean Sea Level, based in Liverpool.
Gauges measure sea levels relative to the land. This is sometimes referred to as Relative Sea Level or RSL.
These sea levels can change essentially for two reasons.
1) Eustatic Change
In simple terms, this refers to the volume of water in the ocean, which can increase, for instance, because of glacial melting and thermal expansion.
The other mechanism mentioned is a change in the size of the ocean basin that contains…
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