Limited Impact of Subglacial Supercooling Freeze‐on for Greenland Ice Sheet Stratigraphy

Dow Christine F.; Karlsson Nanna B.; Werder Mauro A.

摘要

Abstract >Large units of disrupted radiostratigraphy (UDR) are visible in many radio‐echo sounding data sets from the Greenland Ice Sheet. This study investigates whether supercooling freeze‐on rates at the bed can cause the observed UDR. We use a subglacial hydrology model to calculate both freezing and melting rates at the base of the ice sheet in a distributed sheet and within basal channels. We find that while supercooling freeze‐on is a phenomenon that occurs in many areas of the ice sheet, there is no discernible correlation with the occurrence of UDR. The supercooling freeze‐on rates are so low that it would require tens of thousands of years with minimal downstream ice motion to form the hundreds of meters of disrupted radiostratigraphy. Overall, the melt rates at the base of the ice sheet greatly overwhelm the freeze‐on rates, which has implications for mass balance calculations of Greenland ice. </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”XML：ID =“Grl56945-Abs-0001”> <标题类型=“main”>抽象</ title> >大单位中断的辐射放射线图（UDR）在来自格陵兰冰板的许多无线电回声探测数据集中可见。本研究研究了床上的过冷冻结率是否会导致观察到的UDR。我们使用底纤维水文模型来计算分布式薄片和基底通道内冰盖底部的冻结和熔化速率。我们发现，虽然过冷冻冻结是冰盖的许多区域发生的现象，但与UDR的发生没有可辨别的相关性。过冷冻结的速率非常低，这需要数万年的数千年来，最小的下游冰动作，形成数百米的中断的接触物图。总体而言，冰盖底部的熔体速率大大压倒了冻结率，这对格陵兰冰的大规模平衡计算具有影响。</ 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-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2018年第3期</span><b style="margin: 0 2px;">|</b><span>共9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=Dow Christine F.&option=202" target="_blank" rel="nofollow">Dow Christine F.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Karlsson Nanna B.&option=202" target="_blank" rel="nofollow">Karlsson Nanna B.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Werder Mauro A.&option=202" target="_blank" rel="nofollow">Werder Mauro A.;</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 Geography and Environmental ManagementUniversity of WaterlooWaterloo Ontario Canada;</p> <p>Alfred Wegener Institute Helmholtz‐Centre for Polar and Marine ResearchBremerhaven Germany;</p> <p>Laboratory of Hydraulics Hydrology and Glaciology (VAW)ETH ZurichZurich Switzerland;</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><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></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=Greenland Ice Sheet&option=203" rel="nofollow">Greenland Ice Sheet;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=supercooling&option=203" rel="nofollow">supercooling;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=ice stratigraphy&option=203" rel="nofollow">ice stratigraphy;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=radio‐echo sounding&option=203" rel="nofollow">radio‐echo sounding;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=subglacial hydrology&option=203" rel="nofollow">subglacial hydrology;</a> </p> <div class="translation"> 机译：格陵兰冰盖;过冷;冰地层;无线电回声探测;底层水文; 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FIXING IMPACT ABSORPTION DOUBLE-SIDE ADHESIVE SHEET AND BACKLIGHT UNIT FIXING IMPACT ABSORPTION DOUBLE-SIDE ADHESIVE SHEET</a> <b>[P]</b> . <span> 外国专利：  JP2020073817A </span> <span> . 2020-05-14</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：冲击吸收板，冲击吸收胶板，前面板固定冲击吸收板，背面板固定冲击吸收板，双面胶板和背面固定胶粘剂的双面胶 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130410367216.html">Supercooling device, refrigerating device having the supercooling device, and supercooling method</a> <b>[P]</b> . <span> 外国专利：  JP6150622B2 </span> <span> . 2017-06-21</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：过冷却装置，具有该过冷却装置的制冷装置和过冷却方法 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" 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