Collection and Analysis of Sediments as Part of the Three- Ship Expedition to the Central Arctic Ocean During the Summer of 1991

1991年夏季北冰洋中部三船考察沉积物的收集与分析

• 批准号: 9024560
• 负责人: Glenn Jones
• 金额: $ 20.27万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9024560&HistoricalAwards=false
• 关键词: Collection; Analysis; Sediments; Part; Three

The high polar latitudes are amongst the most sensitive to climatic changes. In the summer of 1991 an international team of three ice-breakers will depart on a 70 day expedition to explore and sample the largely unknown eastern sector of the central Arctic. This award will support the collection of upwards of 90 sediment cores to provide the scientific community with the first major collection of core materials from the interior of this ocean basin. In addition, the type of materials to be collected (i.e. boxcores, giant gravity cores, and large diameter piston cores) are designed to overcome the poor coretop recovery and very narrow core diameter limitations present in the existing cores. This research will focus on Arctic Ocean sediments deposited during the last 25,000 years to address questions of the temporal and geographic variability in the stable isotopic signature of Arctic surface waters and the response of the central Arctic Ocean to mid-Holocene warming (i.e. Hypsithermal). This work will also help to define the extent and disintegration pattern of the late Weichselian Ice Sheets in the Eurasian Arctic.

高纬度地区是气候变化最敏感的地区之一。1991年夏天，一支由三艘破冰船组成的国际考察队将出发，开始为期70天的探险，对北极中部大部分未知的东部地区进行探索和取样。该奖项将支持收集超过90个沉积物岩心，为科学界提供第一个从海洋盆地内部收集岩心材料的主要项目。此外，要收集的材料类型（即箱形岩心、巨型重力岩心和大直径活塞岩心）的设计是为了克服现有岩心中存在的较差的岩心顶部采收率和非常窄的岩心直径限制。本研究将聚焦于过去25000年沉积的北冰洋沉积物，以解决北极地表水稳定同位素特征的时间和地理变异问题，以及北冰洋中部对全新世中期变暖（即低温）的响应。这项工作还将有助于确定欧亚北极地区晚期魏奇塞利冰盖的范围和解体模式。