{"id":1251,"date":"2023-04-27T15:41:08","date_gmt":"2023-04-27T15:41:08","guid":{"rendered":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/?page_id=1251"},"modified":"2025-03-06T17:31:36","modified_gmt":"2025-03-06T17:31:36","slug":"crevasses-on-outlet-glaciers-across-the-greenland-antarctic-ice-sheets","status":"publish","type":"page","link":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/crevasses-on-outlet-glaciers-across-the-greenland-antarctic-ice-sheets\/","title":{"rendered":"Crevasses on outlet glaciers across the Greenland &amp; Antarctic Ice Sheets"},"content":{"rendered":"\n<p>Crevasses affect ice flow, and thus sea-level rise, in multiple important ways.&nbsp; Crevasses provide entry points for water to reach the interior of a glacier or ice sheet, where it refreezes and warms the ice, reducing the viscosity of the glacier.&nbsp; Crevasses are the primary pathway for meltwater to reach the bed of a glacier or ice sheet, where it changes the hydrologic state and affects ice flow.&nbsp; Crevasses also structurally damage a glacier, reducing its bulk viscosity by accommodating deformation across crevasse planes.&nbsp; Finally, crevasses are the pre-existing fracture planes that allow calving of icebergs into the ocean.&nbsp;&nbsp;The magnitude of all of these effects on ice flow depend on the depth of crevasses, which is notoriously difficult to measure.&nbsp; To constrain the depths of thousands of crevasses across the Greenland and Antarctic Ice Sheets, we are applying remote sensing techniques to derive the surface width of crevasses, then applying a crevasse propagation model to convert those widths to likely depths.&nbsp; We anticipate depth accuracy of ~5-20%, with higher accuracy for deeper crevasses.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"398\" src=\"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-content\/uploads\/sites\/104\/2023\/04\/FigureX_CrevModel_DepthVsWidth-1024x398.jpg\" alt=\"\" class=\"wp-image-1256\" srcset=\"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-content\/uploads\/sites\/104\/2023\/04\/FigureX_CrevModel_DepthVsWidth-1024x398.jpg 1024w, https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-content\/uploads\/sites\/104\/2023\/04\/FigureX_CrevModel_DepthVsWidth-300x117.jpg 300w, https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-content\/uploads\/sites\/104\/2023\/04\/FigureX_CrevModel_DepthVsWidth-768x299.jpg 768w, https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-content\/uploads\/sites\/104\/2023\/04\/FigureX_CrevModel_DepthVsWidth-1536x597.jpg 1536w, https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-content\/uploads\/sites\/104\/2023\/04\/FigureX_CrevModel_DepthVsWidth-1568x610.jpg 1568w, https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-content\/uploads\/sites\/104\/2023\/04\/FigureX_CrevModel_DepthVsWidth.jpg 1687w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">(a) Crevasses widen and deepen over time when filled with meltwater.  When the meltwater supply stops changing, the crevasse depth and shape quickly equilibrate.  <br>(b) Crevasse width (x) can be used to measure crevasse depth (y) if the stress state (colors) surrounding the crevasse is known.  Here, we use remote sensing observations (ICESat-2, WorldView DEMs, and others) to measure crevasse width, and a crevasse propagation model (results shown here) to translate width to depth.<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\">\ud83e\uddca<\/p>\n\n\n\n<p>You can apply for a graduate research position at <a href=\"http:\/\/arts-sciences.buffalo.edu\/geology\/apply.html\" target=\"_blank\" rel=\"noreferrer noopener\">http:\/\/arts-sciences.buffalo.edu\/geology\/apply.html <\/a>. <strong>UB Earth Sciences does NOT require the Graduate Record Examination (GRE) <\/strong>for admission to the graduate program.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Crevasses affect ice flow, and thus sea-level rise, in multiple important ways.&nbsp; Crevasses provide entry points for water to reach the interior of a glacier or ice sheet, where it &hellip; <a href=\"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/crevasses-on-outlet-glaciers-across-the-greenland-antarctic-ice-sheets\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Crevasses on outlet glaciers across the Greenland &amp; Antarctic Ice Sheets<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":301,"featured_media":731,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1251","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/pages\/1251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/users\/301"}],"replies":[{"embeddable":true,"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/comments?post=1251"}],"version-history":[{"count":4,"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/pages\/1251\/revisions"}],"predecessor-version":[{"id":1802,"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/pages\/1251\/revisions\/1802"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/media\/731"}],"wp:attachment":[{"href":"https:\/\/ubwp.buffalo.edu\/glaciermodelinglab\/wp-json\/wp\/v2\/media?parent=1251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}