W-Antarctic Ice Sheet:Geological Influence on the Onset of Fast Moving Ice


	W-Antarctic Ice Sheet:Geological Influence on the Onset of Fast Moving Ice

amgumen

3-28-2008 6:39 PM

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tags:

geology, climate

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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://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/e67fd70a-b31c-4cac-867c-02897186a173/A70124F4-DA76-41DA-91C7-DE2FDBD9735B/" 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://www.ldeo.columbia.edu/%7Emstuding/wais.html" href="http://www.ldeo.columbia.edu/%7Emstuding/wais.html" style="font-size: 11px;">www.ldeo.columbia.edu</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.ldeo.columbia.edu/%7Emstuding/wais.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.ldeo.columbia.edu/img/657219CC-81C8-423A-95E2-185BD051784D" alt="West Antarctic Ice Sheet Ice Stream Onsets" /></div></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://www.ldeo.columbia.edu/%7Emstuding/wais.html">The West Antarctic Ice Sheet</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://www.ldeo.columbia.edu/%7Emstuding/wais.html">The base of the ice sheet is grounded on bedrock well below sea-level, and much of the perimeter is surrounded by floating ice shelves.</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://www.ldeo.columbia.edu/%7Emstuding/wais.html">The image (C) shows sedimentary basins beneath fast-moving West Antarctic ice streams as interpreted from subglacial topography, aerogravity, and aeromagnetic data. These ice streams drain the West Antarctic Ice Sheet. It is believed that the sedimentary basins, together with subglacial water, provide the necessary lubricant to enable rapid basal flow within ice streams</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://www.ldeo.columbia.edu/%7Emstuding/wais.html">Fast moving ice streams drain the interior ice sheet reservoir playing a critical role in a possible instability of the ice sheet.</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://www.ldeo.columbia.edu/%7Emstuding/wais.html">Evidence is emerging that highly erodable soft sedimentary basins formed in an extensional regime may provide a fixed geologic template for ice streaming. Such basins are likely part of the complex geologic structure of the West Antarctic rift system, a region of elevated heat flux and active subglacial volcanism</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/A70124F4-DA76-41DA-91C7-DE2FDBD9735B/blog/" title="blog or email this clip"><img src="http://content6.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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