NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sea level rise
From: Frank Reed CT
Date: 2006 Jul 8, 17:30 -0500
From: Frank Reed CT
Date: 2006 Jul 8, 17:30 -0500
George, you 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." Indeed I was. I was trying to be brief --and let the data speak for itself (sorry Fred, data speak for themselves). And you wrote: "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." The correct expression, of course, is "relative sea level". The Baltic is shrinking and Sweden and Finland are gaining land area every year because the land up there, which bore the greatest burden of the European ice sheet in the last glaciation, is still rebounding and rising rather rapidly. So "relative sea level" is falling. The same thing is happening to Hudson Bay in Canada. On the US East coast about half, very roughly, of the increase in relative sea level is attributed to geological factors. The land in these area is sinking because the continental shelf, which was dry ground 10,000 years ago, now bears the weight of some 100 meters of water. There are dozens of other tide gauge data sets available at the web site I referenced. Here's the best place to start: http://tidesandcurrents.noaa.gov/sltrends/sltrends.html . -FER 42.0N 87.7W, or 41.4N 72.1W. www.HistoricalAtlas.com/lunars --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---