Climate Change Can Be Abrupt


	Climate Change Can Be Abrupt

dmegivern

12-6-2007 6:20 PM

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tags:

climate change, flooding, oceanic conveyor belt

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12-9-2007 6:58 PM

righthand

Ireland would be the biggest loser by a long way if this change reoccurred.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/757d6692-2f52-44f1-87e7-1ac31e2f7817/FC37E200-447F-433E-A843-87F8282244B3/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://environment.newscientist.com/channel/earth/dn13013-ancient-flood-brought-gulf-stream-to-a-halt.html?feedId=online-news_rss20" href="http://environment.newscientist.com/channel/earth/dn13013-ancient-flood-brought-gulf-stream-to-a-halt.html?feedId=online-news_rss20" style="font-size: 11px;">environment.newscientist.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn13013-ancient-flood-brought-gulf-stream-to-a-halt.html?feedId=online-news_rss20"><H1 class="inline">Ancient flood brought Gulf Stream to a halt</H1></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn13013-ancient-flood-brought-gulf-stream-to-a-halt.html?feedId=online-news_rss20"><P>Just over 8000 years ago, a huge glacial lake in Canada burst, and an estimated 100,000 cubic kilometres of fresh water rushed into the North Atlantic. Researchers now say they know for sure that this catastrophic event shut down the Gulf Stream and cooled parts of the northern hemisphere by several degrees for more than a hundred years.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn13013-ancient-flood-brought-gulf-stream-to-a-halt.html?feedId=online-news_rss20"><P>Modern concerns arise because melting ice, especially on Greenland and in Siberia, is making the North Atlantic less saline. Oceanographers worry that this might eventually be sufficient to shut down the ocean circulation, says Kleiven, just as happened 8000 years ago, "particularly given the concerns about the impact of future warming on the Greenland ice sheet."</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn13013-ancient-flood-brought-gulf-stream-to-a-halt.html?feedId=online-news_rss20"><P>The next step, Kleiven believes, is to use the findings to work out exactly how much freshwater may be needed to shut down the circulation.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/FC37E200-447F-433E-A843-87F8282244B3/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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