{"id":82693,"date":"2019-11-12T12:52:07","date_gmt":"2019-11-12T18:52:07","guid":{"rendered":"https:\/\/news.medill.northwestern.edu\/chicago\/?p=82693"},"modified":"2019-11-15T10:43:26","modified_gmt":"2019-11-15T16:43:26","slug":"greenland-ice-tongue-at-risk-of-melting-away-again","status":"publish","type":"post","link":"https:\/\/news.medill.northwestern.edu\/chicago\/greenland-ice-tongue-at-risk-of-melting-away-again\/","title":{"rendered":"Greenland \u2018ice tongue\u2019 at risk of melting away \u2014 again"},"content":{"rendered":"<p><strong>By Zack Fishman<\/strong><br \/>\n<em>Medill Reports<\/em><\/p>\n<p class=\"dropcap\">A 30-mile-long strip of sea ice in northwest Greenland, once thought to be a permanent structure, didn\u2019t exist until 2,000 years ago, according to <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0277379119300502\">newly published research<\/a> from researchers at Oregon State University. The findings suggest that some of the Arctic may melt more quickly in today\u2019s warming climate than previously expected.<\/p>\n<p>The sea ice, known as the Petermann ice tongue, stretches across a narrow valley where the large Petermann Glacier meets the Arctic Ocean. The ice tongue captured media attention in <a href=\"https:\/\/dotearth.blogs.nytimes.com\/2010\/08\/07\/vast-ice-island-breaks-free-of-greenland-glacier\/?searchResultPosition=3\">2010<\/a> and <a href=\"https:\/\/www.washingtonpost.com\/\">2012<\/a> when enormous icebergs, each many times larger than Manhattan Island, broke off into the ocean. New fractures spotted this year threaten to shrink the ice tongue to its smallest size in modern history.<!--more--><\/p>\n<figure id=\"attachment_82697\" aria-describedby=\"caption-attachment-82697\" style=\"width: 474px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-82697 size-large\" src=\"https:\/\/news.medill.northwestern.edu\/chicago\/wp-content\/uploads\/sites\/3\/2019\/11\/UNADJUSTEDNONRAW_thumb_1f21-1024x866.jpg\" alt=\"A map of the Petermann Glacier and its ice tongue in northern Greenland. On the right, time-stamped outlines capture the ice tongue shrinking over the last 60 years. (Brendan Reilly\/Oregon State University)\" width=\"474\" height=\"401\" srcset=\"https:\/\/news.medill.northwestern.edu\/chicago\/wp-content\/uploads\/sites\/3\/2019\/11\/UNADJUSTEDNONRAW_thumb_1f21.jpg 1024w, https:\/\/news.medill.northwestern.edu\/chicago\/wp-content\/uploads\/sites\/3\/2019\/11\/UNADJUSTEDNONRAW_thumb_1f21-300x254.jpg 300w, https:\/\/news.medill.northwestern.edu\/chicago\/wp-content\/uploads\/sites\/3\/2019\/11\/UNADJUSTEDNONRAW_thumb_1f21-768x650.jpg 768w\" sizes=\"(max-width: 474px) 100vw, 474px\" \/><figcaption id=\"caption-attachment-82697\" class=\"wp-caption-text\">A map of the Petermann Glacier and its ice tongue in northern Greenland. On the right, time-stamped outlines capture the ice tongue shrinking over the last 60 years. (Brendan Reilly\/Oregon State University)<\/figcaption><\/figure>\n<p>A research group, led by Oregon State post-doctoral researcher Brendan Reilly, sought to understand the modern behavior of the ice tongue by examining its past. They joined dozens of other scientists in 2015 on an expedition to the Petermann Glacier.<\/p>\n<p>\u201cWe were really interested in understanding the geologic history of the Petermann ice tongue on timescales much longer than we can observe using historical record or satellite data,\u201d said Reilly, who studies paleoclimatology.<\/p>\n<p>He and his team took samples of the seabed below the ice, extracting 2-foot-long sediment cores of sand, shells and other debris.<\/p>\n<p>By analyzing the cores, they documented the last 7,000 years of the valley&#8217;s past and found that the ice tongue was missing until about 2,000 years ago. The ice tongue grew to its modern size only in the last few centuries.<\/p>\n<p>\u201cThis was a really surprising finding, at least for me,\u201d he said. \u201cI was expecting to go out there and find history for a very stable system. It\u2019s showing something kind of weird now.\u201d<\/p>\n<p>The Arctic temperatures during its absence were roughly the same as they are today, Reilly said, implying the ice tongue may soon disappear once again. If broken up, the tongue may also cause a rise in sea level by destabilizing the Petermann Glacier.<\/p>\n<p>\u201cLosing the ice tongue will increase the amount of (meltwater) that&#8217;s coming out of that system, so that&#8217;ll be the contribution to sea level rise,\u201d Reilly said.<\/p>\n<p>The contribution wouldn&#8217;t be from the ice tongue itself \u2014 it is floating in the Arctic Ocean and wouldn&#8217;t change sea levels if melted, for the same reason why a full glass of water with ice cubes will never overflow.<\/p>\n<p>The sea level threat instead comes from the rest of the Petermann Glacier, which sits on Greenland and will spill water into the ocean more quickly without a large ice tongue present. The glacier holds enough water to raise global sea level by 1.5 feet, Reilly said.<\/p>\n<p>The new research contributes to scientists\u2019 understanding of modern ice sheets and how they may change in the future, said Sidney Hemming, an associate professor of geochemistry at Columbia University.<\/p>\n<p>She also compliments the innovative techniques Reilly and his team used in analyzing the sediment cores. By sorting and testing different-sized grains, Hemming said, they can glean more information about ice shelves as they existed thousands of years ago.<\/p>\n<p>\u201cBy studying this in detail, they&#8217;re tackling those questions,\u201d Hemming said. \u201cI think it&#8217;s a pretty powerful strategy that they&#8217;re taking.\u201d<\/p>\n<p>Reilly and his team returned to northern Greenland this summer to study the nearby Ryder Glacier, which has its own ice tongue but may respond differently to a warming climate. Their research on both glaciers, Reilly said, \u201ccan be applied to understanding the future of North Greenland.\u201d<\/p>\n<div class=\"featurecaption\">Photo at top: Paleoclimatologist Brendan Reilly and Ph.D. student Anna Glueder collect rock and sediment samples near the Petermann Glacier in northwest Greenland. (Brendan Reilly\/Oregon State University)<\/div>\n","protected":false},"excerpt":{"rendered":"<p>By Zack Fishman Medill Reports A 30-mile-long strip of sea ice in northwest Greenland, once thought to be a permanent structure, didn\u2019t exist until 2,000 years ago, according to newly published research from researchers at Oregon State University. The findings suggest that some of the Arctic may melt more quickly in today\u2019s warming climate than [&hellip;]<\/p>\n","protected":false},"author":600,"featured_media":82696,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4780,28,29,30],"tags":[4853,4852,192],"class_list":["post-82693","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fall-2019","category-general-interest","category-health-and-science","category-public-affairs","tag-brendan-reilly","tag-petermann-glacier","tag-promo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Greenland \u2018ice tongue\u2019 at risk of melting away \u2014 again - Medill Reports Chicago<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/news.medill.northwestern.edu\/chicago\/greenland-ice-tongue-at-risk-of-melting-away-again\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Greenland \u2018ice tongue\u2019 at risk of melting away \u2014 again - Medill Reports Chicago\" \/>\n<meta property=\"og:description\" content=\"By Zack Fishman Medill Reports A 30-mile-long strip of sea ice in northwest Greenland, once thought to be a permanent structure, didn\u2019t exist until 2,000 years ago, according to newly published research from researchers at Oregon State University. The findings suggest that some of the Arctic may melt more quickly in today\u2019s warming climate than [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/news.medill.northwestern.edu\/chicago\/greenland-ice-tongue-at-risk-of-melting-away-again\/\" \/>\n<meta property=\"og:site_name\" content=\"Medill Reports Chicago\" \/>\n<meta property=\"article:published_time\" content=\"2019-11-12T18:52:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-11-15T16:43:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/s3.amazonaws.com\/medill.wordpress.offload\/WP%20Media%20Folder%20-%20medill-reports-chicago\/wp-content\/uploads\/sites\/3\/2019\/11\/UNADJUSTEDNONRAW_thumb_1f20.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"768\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"zacharyfishman2020\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"zacharyfishman2020\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/news.medill.northwestern.edu\\\/chicago\\\/greenland-ice-tongue-at-risk-of-melting-away-again\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/news.medill.northwestern.edu\\\/chicago\\\/greenland-ice-tongue-at-risk-of-melting-away-again\\\/\"},\"author\":{\"name\":\"zacharyfishman2020\",\"@id\":\"https:\\\/\\\/news.medill.northwestern.edu\\\/chicago\\\/#\\\/schema\\\/person\\\/15710d85e0fc0629ce16cc49125d611f\"},\"headline\":\"Greenland \u2018ice tongue\u2019 at risk of melting away \u2014 again\",\"datePublished\":\"2019-11-12T18:52:07+00:00\",\"dateModified\":\"2019-11-15T16:43:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/news.medill.northwestern.edu\\\/chicago\\\/greenland-ice-tongue-at-risk-of-melting-away-again\\\/\"},\"wordCount\":667,\"image\":{\"@id\":\"https:\\\/\\\/news.medill.northwestern.edu\\\/chicago\\\/greenland-ice-tongue-at-risk-of-melting-away-again\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/s3.amazonaws.com\\\/medill.wordpress.offload\\\/WP%20Media%20Folder%20-%20medill-reports-chicago\\\/wp-content\\\/uploads\\\/sites\\\/3\\\/2019\\\/11\\\/UNADJUSTEDNONRAW_thumb_1f20.jpg\",\"keywords\":[\"Brendan Reilly\",\"Petermann Glacier\",\"promo\"],\"articleSection\":[\"Fall 2019\",\"General Interest\",\"Health and Science\",\"Public Affairs\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/news.medill.northwestern.edu\\\/chicago\\\/greenland-ice-tongue-at-risk-of-melting-away-again\\\/\",\"url\":\"https:\\\/\\\/news.medill.northwestern.edu\\\/chicago\\\/greenland-ice-tongue-at-risk-of-melting-away-again\\\/\",\"name\":\"Greenland \u2018ice tongue\u2019 at risk of melting away \u2014 again - 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