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

这个项目是为了参加RV Jan Mayen(特罗姆斯大学)的巡航，这是科罗拉多大学和特罗姆斯大学(挪威)的研究人员之间的美国/挪威联合研究邮轮。邮轮上的联席首席科学家将是哈尔德(特罗姆斯)和詹宁斯(科罗拉多州)。该研究计划是在科罗拉多州哈尔德休假期间共同制定的，并建立在1991年和1993年与研训所领导进行的海上侦察巡航的基础上。邮轮将于9月1日至9月1日之间举行。从冰岛西北部横跨丹麦海峡至东格陵兰边缘，北纬约68度(图1)。这次巡航的主要目标是提取沉积物岩芯，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这一关键“门户”的冰盖/海洋相互作用的信息。根据现有的岩心数据(主要是1-2米长的重力岩芯)，以及对格陵兰东部陆架1655公里地震轨迹的详细分析，选择了关键的取芯地点，以1)测试陆架上潜在的晚第四纪冰盖接地位置：以及2)将我们在陆架上的古海洋学时间框架延长到远远超过我们以前遇到的8至14 ka的基本年龄限制。根据冰川历史的不同，获得10米岩心的能力可能会使该团队获得进入海洋同位素阶段2/3的记录。Jan Mayen将配备一个活塞式取样器，使科学家能够获得10米长的取样器，这将使他们提取获取冰川冰范围和冰盖海洋相互作用所需信息的能力发生革命性变化。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的AMS 14C测年，以及高分辨率有孔虫生物地层学。

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.