Hummock corridors in the south‐central sector of the Fennoscandian ice sheet, morphometry and pattern

Peterson Gustaf; Johnson Mark D.

摘要

Abstract >Subglacial conditions strongly influence the flow of ice‐sheets, in part due to the availability of melt water. Contemporary ice sheets are retreating and are affected by increased melting as climate warms. The south Swedish uplands (SSU) were deglaciated during the relatively warm B?lling‐Aller?d interval, and by studying the glacial landforms there it is possible to increase the understanding of the subglacial environment during this period of warming. Across the study area, vast tracts of hummocks have long been recognized. However, recent mapping shows a pattern of elongated zones of hummocks radially oriented, hereafter referred to as ‘hummock corridors’. Morphometric parameters were measured on the hummock corridors using a 2?m horizontal resolution digital elevation model. Corridor width varies between 0.2 and 4.9?km and their length between 1.5 and 11.8?km. A majority of hummock corridors are incised in drumlinised till surfaces. The pattern of hummock corridors shows a clear relation to the overall ice‐flow. Further, hummock corridors do not follow topographic gradients, and in at least one place an esker overlies hummocks on the corridor floor. The lateral spacing of hummock corridors and corridor morphology are similar to tunnel valleys, eskers and glaciofluvial corridors reported elsewhere. Such relationships support a subglacial genesis of the corridors in the SSU by water driven by the subglacial hydraulic gradient and that hummock corridors are forms that can be identified as tunnel valleys and glaciofluvial corridors (GFC). Ages were assigned to hummock‐corridor cross‐sections from a deglacial reconstruction of the Fennoscandian Ice Sheet. By comparing the frequency of corridors per age interval with climate variations from a Greenland ice core, we hypothesize that an increase in the number of corridors is rel </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 xmlns =“http://www.wiley.com/namespaces/wiley”type =“main”xml：lang =“en”> <title type =“main”>抽象</ title> >子透明条件强烈影响冰盖的流动，部分原因是由于熔体水的可用性。当代冰盖正在退缩，受到气候变暖的熔化增加的影响。南方瑞典高地（SSU）在相对温暖的B？隆起的间隔期间崩溃，并通过研究冰川地貌，在这一时期的变暖期间可以增加对底裂环境的理解。在研究区，长期以来一直被认可的大船只。然而，最近的映射显示了径向定向的小木马的细长区域的图案，下文称为“艇走廊”。使用2Ωm水平分辨率数字高度模型在管道走廊上测量形态学参数。走廊宽度在0.2和4.9 km之间变化，其长度在1.5和11.8之间。大多数用枪走廊都在鼓风中切入到表面。水管走廊的模式显示出与整体冰流动的明确关系。此外，海拔走廊不遵循地形梯度，并且在至少一个地方，ESKER覆盖在走廊地板上的Hummocks。 Hummock走廊和走廊形态的横向间隔与隧道谷，ESKERS和Glaciofluvial走廊相似。这种关系支持SSU中的走廊的底纤维原因是由底纤维液压梯度驱动的水，并且管道走廊是可以识别为隧道谷的形式和甘草流路走廊（GFC）。从Fennoscandandian冰盖的冥想重建中分配到Hummock-走廊横截面。通过将每年间隔的走廊频率与来自格陵兰冰核的气候变化进行比较，我们假设走廊数量增加是rel </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-22319/'>《Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group》</a> <b style="margin: 0 2px;">|</b><span>2018年第4期</span><b style="margin: 0 2px;">|</b><span>共11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=Peterson Gustaf&option=202" target="_blank" rel="nofollow">Peterson Gustaf;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Johnson Mark D.&option=202" target="_blank" rel="nofollow">Johnson Mark D.;</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 Physical PlanningGeological Survey of SwedenBox 670 751 28 Uppsala Sweden;</p> <p>Department of Earth SciencesGothenburg UniversityBox 460 405 30 G?teborg Sweden;</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=hummock corridors&option=203" rel="nofollow">hummock corridors;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=glaciofluvial corridors&option=203" rel="nofollow">glaciofluvial corridors;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=fennoscandian ice sheet&option=203" rel="nofollow">fennoscandian ice sheet;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=morphometry&option=203" rel="nofollow">morphometry;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=tunnel valleys&option=203" rel="nofollow">tunnel valleys;</a> </p> <div class="translation"> 机译：Hummock走廊;Glaciofluvial走廊;Fennoscandandian冰盖;形态学;隧道山谷; 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style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：用于风力涡轮机垫片系统的扇形板，具有设计成穿孔板的中心孔，该板通过激光切割分为由钢板制成的三个扇形，其中一个扇形形成有开孔 </span> </p> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/patent-detail/06130479617217.html">Security construction for licence plate - with central sheet bonded to upper and lower cover layers with stamped interdigitated patterns</a> <b>[P]</b> . <span> 外国专利：  DE2819390A1 </span> <span> . 1979-11-08</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：车牌的安全结构-中心板通过冲压叉指图案粘合到上，下覆盖层 </span> </p> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/patent-detail/06130436460202.html">Zone e.g. public garden, access restricting device, has barrier with rotating arm that moves on limited sector, and unlocking mechanism to rotate arm beyond sector, where central zone of arm is located at preset distance from arm`s free end</a> <b>[P]</b> . <span> 外国专利：  FR2871819A1 </span> <span> . 2005-12-23</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：区域例如公共花园，出入限制装置，带有旋转臂的屏障，旋转臂在有限的扇形上移动，解锁机构将手臂旋转到扇形之外，其中手臂的中央区域位于距手臂自由端预设距离的位置 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" id="enpatent55">相关主题</h3> <ul id="subject"> </ul> </div> </div> </div> </div> <div class="right rightcon"> <div class="details_img cardcommon clearfix" style="margin-bottom: 10px;display:none;" > </div> </div> </div> <div id="thesis_get_original1" class="downloadBth" style="bottom: 19px;z-index: 999;" onclick="ywcd('0704023139201','4',7,2,1,'',this,24)" class="delivery" prompt="010401" title="通过人工服务将文献原文发送至邮箱" >获取原文</div> <div class="journalsub-pop-up" 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