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Index of Subjects --Apple-Mail-15--424312129 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi, If your are interested in changing sea levels and coastlines in Atlantic Canada take a look at the CoastWeb site at: http://gsc.nrcan.gc.ca/coast/sealevel/evol/prog_e.php Cheers, Chris On 7-Mar-07, at 5:22 PM, Gerald Ruderman wrote: > 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 suspect that this conclusion may be out of date. >> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _. Christopher Majka - Nova Scotia Museum of Natural History 1747 Summer Street, Halifax, Nova Scotia, Canada B3H 3A6 (902) 424-6435 Email <c.majka@ns.sympatico.ca> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _. --Apple-Mail-15--424312129 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 <HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; = -khtml-line-break: after-white-space; ">Hi,<DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>If your are interested in = changing sea levels and coastlines in Atlantic Canada take a look at the = CoastWeb site at:</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV><A = href=3D"http://gsc.nrcan.gc.ca/coast/sealevel/evol/prog_e.php">http://gsc.= nrcan.gc.ca/coast/sealevel/evol/prog_e.php</A></DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>Cheers,</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>Chris</DIV><DIV><BR><DIV><DIV= >On 7-Mar-07, at 5:22 PM, Gerald Ruderman wrote:</DIV><BR = class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">Steve,</DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: = 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; "><A = href=3D"http://pubs.usgs.gov/gip/continents/map.jpg">http://pubs.usgs.gov/= gip/continents/map.jpg</A> shows NS covered by ice</DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">during the recent ice age and Baltimore exposed. I = wonder how thick the</DIV><DIV style=3D"margin-top: 0px; margin-right: = 0px; margin-bottom: 0px; margin-left: 0px; ">ice was here. I recall = reading it was over 6 000 feet deep in New Hampshire.</DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: = 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; = ">Gerald</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">Steve Shaw wrote:</DIV> <BLOCKQUOTE type=3D"cite"><DIV= style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; "><SPAN class=3D"Apple-converted-space">=A0 </SPAN>For = detailed discussion of land sinking/rising, and of determining</DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">actual mean sea level (MSL) changes over time as a = result of</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; ">measurements that largely = originate from multiple tide gauges, try this</DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">(1995) review:</DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: = 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; = margin-bottom: 0px; margin-left: 0px; "><A = href=3D"http://www.agu.org/revgeophys/dougla01/node3.html">http://www.agu.= org/revgeophys/dougla01/node3.html</A></DIV><DIV style=3D"margin-top: = 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; = min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN = class=3D"Apple-converted-space">=A0 </SPAN>According to this site, local = sea level is rising rapidly by 3.5 mm</DIV><DIV style=3D"margin-top: = 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">per year = near Baltimore because the local land is sinking. Because of a</DIV><DIV = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px; ">sort of amplification effect explained in the = article, a change of 1 mm</DIV><DIV style=3D"marg