Collaborative Research: SCICEX/SCAMP Mapping of the Arctic Ocean Floor to Test the Hypothesis of the Pleistocene Arctic Ice Sheet

AbstractOPP-9813532EdwardsOPP-9813535PolyakThis是由夏威夷大学、地图研究小组和俄亥俄州立大学的首席研究人员合作的项目。首席调查员提议在第四纪历史上的一个重大不确定性--冰川盛期期间测试北冰洋冰盖的存在。检验这一有争议的假设的唯一可靠方法是调查北冰洋海底相对较浅的部分，以寻找冰川撞击的痕迹。在SCICEX项目中使用海底特征和测绘吊舱(SCAMP)为开展这项研究提供了一个独特的机会。将收集楚科奇边界隆起和海脊、洛蒙索夫海脊的部分地区，可能还有加拿大大陆边缘的后向散射、条带测深和海底剖面仪记录。首席调查员将专注于冰下和冰缘海底地貌、冰山犁痕以及可能与冰川有关的泥石流的位置和追踪。冰底痕迹和冰缘指标的发现将为北冰洋过去存在厚厚的冰架提供强有力的证据。在没有直接冰下特征的情况下，冰山犁痕的深度范围将提供关于北冰洋第四纪期间冰层厚度的关键信息。绘制耕作方向图将能够重建北极的古环流模式。经过处理的海底图像将与大陆边缘现有的冰川特征进行比较。未来的沉积岩芯和钻孔将对绘制的冰川海底地貌提供地层限制，并提供对相关古海洋环境的进一步了解。

AbstractOPP-9813532EdwardsOPP-9813535PolyakThis is a collaborative project by Principal Investigators from the University of Hawaii, Mapping Research Group, and Ohio State University. The Principal Investigators propose to test the existence of the Arctic Ocean Ice Sheet during the glacial maxima which is a major uncertainty in Quaternary history. The only reliable way of testing this controversial hypothesis is to investigate the relatively shallow portions of the Arctic Ocean seafloor for traces of glacial impact. The use of the Seafloor Characterization and Mapping Pod (SCAMP) in the SCICEX program provides a unique opportunity to perform this research. Backscatter, swath bathymetry, and subbottom profiler records across the rises and ridges of the Chukchi Borderland, parts of the Lomonsov Ridge, and possibly the Canadian continental margin will be collected. The Principal Investigators will concentrate on the location and tracing of subglacial and ice-marginal seafloor features, iceberg plow marks, and potentially glacier-related debris flows. Findings of glacial-sole marks and ice-marginal indicators would provide strong evidence for the existing of a thick ice shelf over the Arctic Ocean in the past. In the absence of direct subglacial features, the depth range of iceberg plowmarks will provide critical information on the thickness of the ice over the Arctic Ocean during the Quaternary. Mapping the plowmark orientation will enable reconstruction of Arctic paleo-circulation patterns. The processed seafloor images will be compared with existing glacial features from the continental margin. Future sediment cores and boreholes will provide stratigraphic constraints on the mapped glacial seafloor features and provide further understanding of associated paleoceanographic environments.