The Greenland ice sheet is less stable than thought
Researchers at the University of Cambridge have developed a new model that shows that, despite his apparent stability, the massive ice sheet that covers most of Greenland is more sensitive to climate change than estimated earlier studies. If it is true, it could speed up sea level rise, which threatens coastal communities around the world.In addition to assessing the increasing levels of water created by melting and dumped in the ocean with the heating, the model takes into account also the role that soft and spongy ground beneath the ice layer holds in changing their dynamics.According to the study, which was published yesterday in Nature, the Greenland ice sheet is the second largest in the world and covers 1.7 million square miles, containing enough ice to raise sea levels by more than seven metres if all melt.Currently, only with surface melting, the ice loss takes place at an annual rate of 200 gigatons, equivalent to a rise of 0.6 mm annually. Globally, the level rises to 3 mm per year, today's data."Be due to seasonal change or climate warming, the layer does not melt like an ice cube," said Marion Bougamont, Polar Research Institute in Cambridge, to Red Orbit. "Instead, there are two sources of loss of ice melt on the surface ice flow himself, and there is a link between these two mechanisms we don't understand fully and that is not taken into account in default templates."See what the world's most vulnerable cities and its gallery. .fancybox-wrap { position: absolute; top:0; left: 0; z-index: 8020; } .fancybox-skin { position: relative; /*margin-top:20px !important;*/ background: #222222; color: #74b32e; text-shadow: none; -webkit-border-radius: 2px; -moz-border-radius: 2px; border-radius: 2px; } .fancybox-opened { z-index: 8030; } .fancybox-opened .fancybox-skin { -webkit-box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5); -moz-box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5); box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5); } .fancybox-outer, .fancybox-inner { position: relative; } .fancybox-inner { overflow: hidden; } .fancybox-type-iframe .fancybox-inner { -webkit-overflow-scrolling: touch; } .fancybox-close{ background: url('wp-content/themes/codistage/styles/fancybox/exit.png') no-repeat; width:25px; height:25px; float:right; margin-top:10px; margin-right:5px; } /*.ngg-gallery-image img{width:565px; height:393px;}*/ As cidades mais vulneráveis do mundo 1 of 10 jQuery(document).ready(function($) { var thumbContainerWidth = 0, thumbs = Array(), selectedIndex = 1, thumbIndex = 1, imageOffset = 7; $('.ngg-gallery-thumbnail-box').each(function() { thumbs.push($(this)); }); /*thumbnail navigation */ $('.ngg-greensavers-thumb-next').unbind().bind('click', function(e) { e.preventDefault(); if(thumbIndex <= (thumbs.length-imageOffset)) { $('.ngg-thumbnails-container').stop().animate({ left : -$(thumbs[thumbIndex]).position().left }); thumbIndex++; } }); $('.ngg-greensavers-thumb-prev').unbind().bind('click', function(e) { e.preventDefault(); if(thumbIndex > 1) { $('.ngg-thumbnails-container').stop().animate({ left : $('.ngg-thumbnails-container').position().left + ( $(thumbs[thumbIndex-1]).position().left - $(thumbs[thumbIndex-2]).position().left ) }); thumbIndex--; } }); $(window).load(function() { /* set thumbnail container width */ $('.ngg-gallery-thumbnail').each(function() { thumbContainerWidth = thumbContainerWidth + $(this).width() + 10; }); $('.ngg-thumbnails-container').width(thumbContainerWidth); }); }); Foto: Christine Zenino / Creative Commons
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