Reconstructing the Limits of the Last Glaciation and Postglacial Environments in the Southeastern Barents and Southwestern Kara Seas

重建巴伦支海东南部和喀拉海西南部末次冰期和冰后环境的界限

• 批准号: 9818247
• 负责人: Leonid Polyak
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9818247&HistoricalAwards=false
• 关键词: Reconstructing; Limits; Last; Glaciation; Postglacial

The Principal Investigator will attempt to define and date the highly-debated southeastern margin of the latest Barents-Kara Ice Sheet. The uncertain configuration of this major Northern Hemisphere marine-based ice sheet results in striking discrepancies in global models of ice and sea-level distribution at and after the Last Glacial Maximum. A major question is related to the southeast extent of the Barents-Kara Ice Sheet. It is unclear whether Late Weichselian ice advanced onto the coasts of western Siberia and Pechora lowland. He surmises that the ice-sheet limits should be investigated on the shelf of the Barents and Kara Seas south and east of the Novaya Zemlya archipelago.The Principal Investigator will organize a Russian-American oceanographic program to retrieve geophysical and sedimentary records from the Pechora Sea and southwestern Kara Sea of time-constrained ice-sheet development and postgacial environmental history. The goal will be to build a comprehensive characterization of the glacier-marginal zone by seismic, side-scan, and penetration sonar profiling, and recover long sediment cores in key locations. Sediment records will be analyzed for lithological, paleobiological, and geochemical proxies supported by rigorous chronostratigraphic control. He anticipates identifying: 1) the marginal position of the last glaciation, 2) the timing of its culmination and the speed of retreat, and 3) major (extreme) events in the evolution of postglacial environments in the southern Barents and Kara seas. Although he does not plan to do a detailed study of the late Holocene, he can use accumulated data to investigate recent climatic change in the Eurasian Arctic.

首席研究员将试图定义和日期备受争议的最新巴伦茨-卡拉冰盖的东南边缘。 这个主要的北方海洋冰盖的不确定的配置结果在冰和海平面分布的全球模型在末次冰期最大和之后的显着差异。 一个主要的问题与巴伦茨-卡拉冰盖的东南范围有关。 目前还不清楚魏克塞尔晚期的冰是否推进到西伯利亚西部和伯朝拉低地的海岸。 他推测，冰盖的界限应该在巴伦支海和卡拉海的陆架上进行调查，主要研究员将组织一个俄美海洋学计划，从伯朝拉海和卡拉海西南部检索受时间限制的冰盖发展和后冰川环境历史的地球物理和沉积记录。 目标是通过地震、侧扫和穿透声纳剖面法全面确定冰川边缘区的特征，并在关键地点采集长沉积物岩心。 沉积物记录将分析岩性，古生物和地球化学代理支持严格的年代地层控制。 他预计将查明：1）末次冰期的边缘位置，2）其鼎盛时期和消退速度，3）巴伦支海和喀拉海南部冰后期环境演变中的重大（极端）事件。 虽然他不打算对全新世晚期进行详细研究，但他可以利用积累的数据来调查欧亚北极地区最近的气候变化。