Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models?

Kyrke‐Smith Teresa M.; Gudmundsson G. Hilmar; Farrell Patrick E.

摘要

Abstract >We investigate correlations between seismically derived estimates of basal acoustic impedance and basal slipperiness values obtained from a surface‐to‐bed inversion using a Stokes ice flow model. Using high‐resolution measurements along several seismic profiles on Pine Island Glacier (PIG), we find no significant correlation at kilometer scale between acoustic impedance and either retrieved basal slipperiness or basal drag. However, there is a stronger correlation when comparing average values along the individual profiles. We hypothesize that the correlation appears at the length scales over which basal variations are important to large‐scale ice sheet flow. Although the seismic technique is sensitive to the material properties of the bed, at present there is no clear way of incorporating high‐resolution seismic measurements of bed properties on ice streams into ice flow models. We conclude that more theoretical work needs to be done before constraints on mechanical conditions at the ice‐bed interface from acoustic impedance measurements can be of direct use to ice sheet models. </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：ID =“JGRF20764-ABS-ABS-ABS-ABS-0001”> <标题类型=“MAIN”>抽象</标题> <P>我们研究了基础声阻抗和基底滑滑值的地震衍生估计之间的相关性从使用Stokes冰流模型从表面到床反转获得。在松树岛冰川（猪）上的几个地震曲线上使用高分辨率测量，发现声阻抗与检索到基础滑移或基底阻力之间没有显着相关性。然而，当比较各个配置文件的平均值时存在更强的相关性。我们假设相关性出现在尺度上，基础变化对大规模冰盖流程很重要。虽然地震技术对床的材料特性敏感，但目前没有明确的方法将高分辨率的地震测量纳入冰流模型的冰流中。我们得出结论，在从声阻抗测量的冰床界面上的机械条件的限制之前需要进行更多的理论工作可以直接用来冰盖模型。</ 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11期</span><b style="margin: 0 2px;">|</b><span>共14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=Kyrke‐Smith Teresa M.&option=202" target="_blank" rel="nofollow">Kyrke‐Smith Teresa M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Gudmundsson G. Hilmar&option=202" target="_blank" rel="nofollow">Gudmundsson G. Hilmar;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Farrell Patrick E.&option=202" target="_blank" rel="nofollow">Farrell Patrick E.;</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>British Antarctic SurveyCambridge UK;</p> <p>British Antarctic SurveyCambridge UK;</p> <p>Mathematical InstituteUniversity of OxfordOxford 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=ice sheets&option=203" rel="nofollow">ice sheets;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=inverse modeling&option=203" rel="nofollow">inverse modeling;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Pine Island Glacier&option=203" rel="nofollow">Pine Island Glacier;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=bed conditions&option=203" rel="nofollow">bed conditions;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=subglacial processes&option=203" rel="nofollow">subglacial processes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic measurements&option=203" rel="nofollow">seismic measurements;</a> </p> <div class="translation"> 机译：冰盖;逆建模;松树岛冰川;床条件;底透明过程;地震测量; </div> </li> </ul> </div> </div> <div class="literature cardcommon" id="literaturereference" style="display:none"> <div class="similarity "> <h3 class="all_title" id="enpatent111">引文网络</h3> <div class="referencetab clearfix"> <ul id="referencedaohang"> <li dataid="referenceul">参考文献</li> <li dataid="citationul">引证文献</li> <li dataid="commonreferenceul">共引文献</li> <li dataid="commoncitationul">同被引文献</li> <li dataid="tworeferenceul">二级参考文献</li> <li dataid="twocitationul">二级引证文献</li> </ul> </div> <div class="reference_details" id="referenceList"> <ul id="referenceul"></ul> <ul id="citationul"></ul> <ul id="commonreferenceul"></ul> <ul id="commoncitationul"></ul> <ul id="tworeferenceul"></ul> <ul id="twocitationul"></ul> </div> </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/0704020651373.html">Can Seismic Observations of Bed Conditions on Ice Streams Help Constrain Parameters in Ice Flow Models?</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kyrke-Smith Teresa M.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Kyrke-Smith Teresa M.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Gudmundsson G. 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