Collaborative Research: Reconstructing the Past 20,000 Years of Glacial and Sea Level History for Severnaya Zemlya Russia, 80 N.

这是一个由俄亥俄州州立大学和伊利诺斯大学芝加哥分校的主要研究人员合作的项目，旨在澄清大约2万年前末次冰盛期（LGM）期间备受争议的卡拉海冰盖北方范围。 由于这一主要冰盖和毗邻的巴伦支海冰盖的形状不确定，很难为全球气候模式模拟创造可靠的边界条件。 要成功解决这个问题，必须对Severnaya Zemlya进行重点的地貌、地层和地质年代学研究。主要研究人员将评估自末次冰期以来Severnaya Zemlya冰川和冰消事件的界限和时间以及相关的相对海平面变化。 美国-俄罗斯-瑞典合作的实地项目将集中在两个关键领域，早期研究人员在这两个领域发现了与末次冰期/间冰期循环有关的丰富的冰川、海洋和陆地沉积物。 研究人员将：1）确定末次冰期均衡响应的大小和时间; 2）确定末次冰期冰川和冰消的年龄和时间; 3）评估末次冰期的流向。 他们将确定LGM是否是现有冰盖的10-20公里规模的扩张，至少一公里厚的冰盖，或一个中间复合体。首席研究员将与冰川学和地球流变学建模社区合作，以提高他们对气候，海平面和内在冰川学控制的理解。 为了帮助重建冰盖厚度和变薄速率，他们还将向地球流变学建模社区提供冰川均衡数据。

Abstract OPP-99-11982LubinskiOhio State UniversityFormanUniversity of Illinois at ChicagoOPP-00-01885This is a collaborative project by Principal Investigators from Ohio State University and University of Illinois at Chicago to clarify the heavily debated northern extent of the Kara Sea Ice Sheet during the Last Glacial Maximum (LGM) around 20 thousand years ago. Uncertainty in the configuration of this major ice sheet and the adjoining Barents Sea Ice Sheet has made it difficult to create reliable boundary conditions for global climate model simulations. A successful solution to this problem must involve focussed geomorphic, stratigraphic, and geochronologic studies of Severnaya Zemlya.The Principal Investigators will evaluate the limits and timing of glacial and deglacial events and associated changes in relative sea level on Severnaya Zemlya since the LGM. A collaborative American-Russian-Swedish field program will focus on two key areas where earlier researchers found rich deposits of glacial, marine, and terrestrial deposits associated with the last glacial/interglacial cycle. The researchers will: 1) determine the magnitude and timing of the LGM glacial-isostatic response; 2) define the age and timing of LGM glaciation and deglaciation; and 3) assess the flow direction of the LGM. They will determine if the LGM was a 10-20 km-scale expansion of existing ice caps, at least one km-thick ice sheet, or an intermediate complex.The Principal Investigators will collaborate with the glaciological and Earth-rheological modeling communities to improve their understanding of climatic, sea-level and intrinsic glaciologic controls on LGM glaciation in the High Arctic. To help reconstruct ice-sheet thickness and thinning rates, they will also provide their glacioisostatic data to the Earth-rheological modeling community.