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Late Quaternary sedimentary processes in the central Arctic Ocean inferred from geophysical mapping
Geomorphology ( IF 3.9 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.geomorph.2020.107309
Lara F. Pérez , Martin Jakobsson , Thomas Funck , Katrine J. Andresen , Tove Nielsen , Matt O'Regan , Finn Mørk

Abstract Cryospheric events in the Arctic Ocean have been largely studied through the imprints of ice sheets, ice shelves and icebergs in the seafloor morphology and sediment stratigraphy. Subglacial morphologies have been identified in the shallowest regions of the Arctic Ocean, up to 1200 m water depth, revealing the extent and dynamics of Arctic ice sheets during the last glacial periods. However, less attention has been given to sedimentary features imaged in the vicinity of the ice-grounded areas. Detailed interpretation of the sparse available swath bathymetry and sub-bottom profiles from the Lomonosov Ridge and the Amundsen Basin shows the occurrence of mass transport deposits (MTDs) and sediment waves in the central Arctic Ocean. The waxing and waning ice sheets and shelves in the Arctic Ocean have influenced the distribution of MTDs in the vicinity of grounding-ice areas, i.e. along the crest of Lomonosov Ridge. Due to the potential of Arctic sediments to hold gas hydrates, their destabilization should not be ruled out as trigger for sediment instability. Sediment waves formed by the interaction of internal waves that propagate along water mass interfaces with the bathymetric barrier of Lomonosov Ridge. This work describes the distribution and formation mechanisms of MTDs and sediment waves in the central Arctic Ocean in relation to grounding ice and internal waves between water masses, respectively. The distribution of these features provides new insight into past cryospheric and oceanographic conditions of the central Arctic Ocean.

中文翻译:

从地球物理绘图推断北冰洋中部晚第四纪沉积过程

摘要 北冰洋冰冻圈事件的研究主要是通过冰盖、冰架和冰山在海底形态和沉积地层中的印记。已经在北冰洋最浅的区域确定了冰下形态,水深达 1200 米,揭示了最后冰期期间北极冰盖的范围和动态。然而,很少有人关注在冰陆地区附近成像的沉积特征。对来自罗蒙诺索夫海岭和阿蒙森盆地的稀疏可用条带水深测量和海底剖面的详细解释表明,在北冰洋中部发生了质量输送沉积物 (MTD) 和沉积波。北冰洋冰盖和冰架的增减影响了 MTD 在接地冰区附近的分布,即沿罗蒙诺索夫海脊的顶部。由于北极沉积物具有容纳天然气水合物的潜力,不应排除它们的不稳定是沉积物不稳定的触发因素。由沿水体界面传播的内波与罗蒙诺索夫海岭的测深屏障相互作用而形成的沉积波。这项工作描述了北冰洋中部 MTD 和沉积波的分布和形成机制,分别与接地冰和水团之间的内波有关。这些特征的分布为了解北冰洋中部过去的冰冻圈和海洋条件提供了新的见解。沿着罗蒙诺索夫岭的山顶。由于北极沉积物具有容纳天然气水合物的潜力,不应排除它们的不稳定是沉积物不稳定的触发因素。由沿水体界面传播的内波与罗蒙诺索夫海岭的测深屏障相互作用而形成的沉积波。这项工作描述了北冰洋中部 MTD 和沉积波的分布和形成机制,分别与接地冰和水团之间的内波有关。这些特征的分布为了解北冰洋中部过去的冰冻圈和海洋条件提供了新的见解。沿着罗蒙诺索夫岭的山顶。由于北极沉积物具有容纳天然气水合物的潜力,不应排除它们的不稳定是沉积物不稳定的触发因素。由沿水体界面传播的内波与罗蒙诺索夫海岭的测深屏障相互作用而形成的沉积波。这项工作描述了北冰洋中部 MTD 和沉积波的分布和形成机制,分别与接地冰和水团之间的内波有关。这些特征的分布为了解北冰洋中部过去的冰冻圈和海洋条件提供了新的见解。由沿水体界面传播的内波与罗蒙诺索夫海岭的测深屏障相互作用而形成的沉积波。这项工作描述了北冰洋中部 MTD 和沉积波的分布和形成机制,分别与接地冰和水团之间的内波有关。这些特征的分布为了解北冰洋中部过去的冰冻圈和海洋条件提供了新的见解。由沿水体界面传播的内波与罗蒙诺索夫海岭的测深屏障相互作用而形成的沉积波。这项工作描述了北冰洋中部 MTD 和沉积波的分布和形成机制,分别与接地冰和水团之间的内波有关。这些特征的分布为了解北冰洋中部过去的冰冻圈和海洋条件提供了新的见解。
更新日期:2020-11-01
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