Support for a Coring Cruise to the East Greenland Continental Margin and Denmark Strait, and Preliminary Data Analysis

支持前往东格陵兰大陆边缘和丹麦海峡的取芯巡航及初步数据分析

• 批准号: 9615935
• 负责人: Anne Jennings
• 金额: $ 5万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615935&HistoricalAwards=false
• 关键词: Support; Coring; Cruise; East; Greenland

This project is to participate in a cruise of RV Jan Mayen (University of Troms() which was planned as a joint USA/Norwegian research cruise between investigators at the University of Colorado and the University of Troms(, Norway. The Co-Chief Scientists on the cruise will be Hald (Troms() and Jennings (Colorado). The research plan was developed jointly during a sabbatical of Hald in Colorado and built upon the reconnaissance marine cruises that had been undertaken with INSTAAR leadership in 1991 and 1993. The cruise will take place between Sept. 21 and Oct. 10th, 1996 (Troms( to Troms() and will undertake a transect from NW Iceland, across Denmark Strait to the East Greenland margin at ca. 68o N (Fig. 1). The major goal of the cruise is to extract sediment cores which will provide information on the extent of the Greenland Ice Sheet in the Denmark Strait, and the late Quaternary paleoceanography and on ice sheet/ocean interactions across this critical "gateway" between the arctic and mid-latitude North Atlantic. Based on existing core data (mainly 1-2 m long gravity cores), and on a detailed analysis of 1655 km of seismic tracklines on the E. Greenland shelf, key coring sites have been selected to 1) test potential late Quaternary ice-sheet grounding positions on the shelf: and 2) extend our paleoceanographic time-frame on the shelf well beyond the 8 to 14 ka basal age limit that we encountered previously. The ability to obtain 10-m cores will potentially allow the team to obtain records into Marine Isotope Stage 2/3, depending on the glacial history. The Jan Mayen will be equipped with a piston corer that will allow the scientists to obtain 10 m long cores, which will revolutionize their ability to extract the information needed to obtain on glacial ice extent and icesheet ocean interactions. Preliminary analyses of the East Greenland cores will also be undertaken including visual and x-radiograph core descriptions, laser color logging, bulk density measurements, volume and m ass magnetic susceptibility, AMS 14C dating of foraminifera and potentially molluscs, and coarse resolution foraminiferal biostratigraphy.

该项目将参加RV Jan马延号（特罗姆大学）的巡航考察，该巡航考察计划由科罗拉多大学和特罗姆大学（挪威）的研究人员联合进行。 巡航中的联合首席科学家将是哈尔德（特罗姆）和詹宁斯（科罗拉多）。 该研究计划是在哈尔德在科罗拉多休假期间共同制定的，并以1991年和1993年与研究所领导人进行的海上侦察巡航为基础。 这次航行将于9月10日至12日进行。21日和1996年10月10日（特罗姆（至特罗姆（），并将进行一个从冰岛西北部穿越丹麦海峡至东格陵兰边缘的断面。北纬68度（图1）。 这次航行的主要目标是提取沉积物岩心，以提供关于丹麦海峡格陵兰冰盖范围、第四纪晚期古海洋学以及横跨北极和中纬度北大西洋之间这一关键“门户”的冰盖/海洋相互作用的资料。 根据现有的岩心资料（主要是1-2 m长的重力岩心），并对东太平洋1655 km的地震轨迹进行了详细分析。格陵兰大陆架，关键的取芯地点已被选定1）测试潜在的晚第四纪冰盖着陆位置的架子上：和2）延长我们的古海洋学的时间框架远远超过8至14万年的基底年龄限制，我们以前遇到的。 获得10米岩心的能力将可能使该团队获得海洋同位素阶段2/3的记录，这取决于冰川历史。 Jan马延号将配备一个活塞取样器，使科学家能够获得10米长的岩心，这将彻底改变他们提取冰川冰范围和冰洋相互作用所需信息的能力。 还将对东格陵兰岩心进行初步分析，包括目视和X射线岩心描述、激光彩色测井、体积密度测量、体积和质量磁化率、有孔虫和潜在软体动物AMS 14 C测年以及粗分辨率有孔虫生物地层学。