Seasonal Variability in Regional Ice Flow Due to Meltwater Injection Into the Shear Margins of Jakobshavn Isbr?

Cavanagh J. P.; Lampkin D. J.; Moon T.

摘要

Abstract >The impact of meltwater injection into the shear margins of Jakobshavn Isbr? via drainage from water‐filled crevasses on ice flow is examined. We use Landsat‐8 Operational Land Imager panchromatic, high‐resolution imagery to monitor the spatiotemporal variability of seven water‐filled crevasse ponds during the summers of 2013 to 2015. The timing of drainage from water‐filled crevasses coincides with an increase of 2 to 20% in measured ice velocity beyond Jakobshavn Isbr? shear margins, which we define as extramarginal ice velocity. Some water‐filled crevasse groups demonstrate multiple drainage events within a single melt season. Numerical simulations show that hydrologic shear weakening due to water‐filled crevasse drainage can accelerate extramarginal flow by as much as ~35% within 10?km of the margins and enhance mass flux through the shear margins by 12%. This work demonstrates a novel mechanism through which surface melt can influence regional ice flow. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”xml：lang =“en”> <title type =“main”>摘录</ title> >熔体喷射到jakobshavn isbr剪切边缘的影响？通过填充冰流量的通过排水进行检查。我们使用Landsat-8运营土地成像仪Panchromatic，高分辨率图像来监测2013年至2015年夏季的七种充分的裂隙池塘的时空变化。排水的排水时间与2增加2次jakobshavn isbr超出了20％的冰速度？剪切边距，我们将其定义为横向冰速。一些充满水的裂缝团体在单一的熔体季节中展示了多个排水事件。数值模拟表明，由于水填充的裂隙引流引起的水文剪切削弱可以在边缘10μm的10μmkm内的10.〜35％内加速含紫外流量，并通过剪切边缘增强质量助焊剂12％。这项工作展示了一种新的机制，表面熔体可以影响区域冰流量。</ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-34664/'>《Journal of geophysical research. Earth Surface: JGR》</a> <b style="margin: 0 2px;">|</b><span>2017年第12期</span><b style="margin: 0 2px;">|</b><span>共18页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cavanagh J. P.&option=202" target="_blank" rel="nofollow">Cavanagh J. P.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lampkin D. J.&option=202" target="_blank" rel="nofollow">Lampkin D. J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Moon T.&option=202" target="_blank" rel="nofollow">Moon T.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Department of Atmospheric and Oceanic SciencesUniversity of MarylandCollege Park MD USA;</p> <p>Department of Atmospheric and Oceanic SciencesUniversity of MarylandCollege Park MD USA;</p> <p>Bristol Glaciology Centre School of Geographical SciencesUniversity of BristolBristol UK;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span>TP79:P3; </span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Arctic glaciology&option=203" rel="nofollow">Arctic glaciology;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=ice velocity&option=203" rel="nofollow">ice velocity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=crevasses&option=203" rel="nofollow">crevasses;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=glacier flow&option=203" rel="nofollow">glacier flow;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=glacial hydrology&option=203" rel="nofollow">glacial hydrology;</a> </p> <div class="translation"> 机译：北极冰川术;冰速度;裂缝;冰川流动;冰川水文; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704025586812.html">Seasonal Variability in Regional Ice Flow Due to Meltwater Injection Into the Shear Margins of Jakobshavn Isbr?</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cavanagh J. 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