[NatureNS] Determining Elevation

References: <996250.19958.qm@web36213.mail.mud.yahoo.com> <45EF1815.9020909@zdoit.airpost.net> <1571a4be1bd8f2bed07293f554c9ae24@dal.ca> <45EF2D18.1070900@zdoit.airpost.net>
From: c.majka@ns.sympatico.ca
Date: Wed, 7 Mar 2007 17:44:59 -0400
To: naturens@chebucto.ns.ca
Precedence: bulk
Return-Path: <naturens-mml-owner@chebucto.ns.ca>
Original-Recipient: rfc822;"| (cd /csuite/info/Environment/FNSN/MList; /csuite/lib/arch2html)"

next message in archive
next message in thread
previous message in archive
previous message in thread
Index of Subjects

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 suspect that this conclusion may be out of date.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