Late Quaternary Ice Sheet Extent, Chronology, and Paleoceanography, East Greenland Margin/Denmark Strait: Implictions for the Arctic and North Alantic Oceans

要求提供资金，以支持对美国/挪威联合研究航行期间从格陵兰东部获得的沉积物岩心进行研究。 该提案的目标是：1）记录过去30 ka东格陵兰/丹麦海峡边缘冰盖/斜坡/深海沉积物的转移和相互作用; 2）测试末次盛冰期（LGM）期间东格陵兰冰盖边缘范围和退缩时间的不同假设;和3）开发和解释高分辨率海洋记录（十年至百年的时间尺度）的地表水的性质的变化（东格陵兰海流）和底层水（北极中层水）至少在过去的14 ka，以及这些数据如何反映在北极和北大西洋的古海洋的变化。 从以前的调查和1996年的岩心收集过程中，大陆架和斜坡上的岩心被牢固地置于地震地层框架中。 选择的核心网站的目的是1）测试两个对比模型的冰川冰的范围在东南格陵兰边缘LGM期间和自2）调查的古海洋学和冰盖/海洋的相互作用横跨北极和北大西洋之间的丹麦海峡“门户”在记录的时间间隔（最近30 ka）。东格陵兰冰缘侧翼丹麦海峡在末次冰期的程度几乎是未知的，但这一程度和时间的冰川消退是了解过去的海洋环流变化的重要参数通过丹麦海峡，这一冰缘的作用在海因里希事件，融水尖峰，和其他突然的气候变化在冰期。 全新世的研究重点是记录峡湾和大陆架的古海洋学和冰川条件，并将这些重建与其他古气候数据进行比较，如来自Renland冰芯的18 °记录，以及正在研究的来自陆地新冰川记录的“小冰期”事件。 这些研究的结果将有助于我们了解全新世期间该地区环境变化的方式、原因和速度。

Funding is requested to support research on sediment cores obtained from eastern Greenland during a joint USA/Norwegian research cruise. The objectives of the proposal are to: 1) Document ice sheet/slope/deep-sea sediment transfers and interactions for the East Greenland/Denmark Strait margin over the last 30ka; 2) Test different hypotheses for the extent of the East Greenland ice sheet's margin during the Last Glacial Maximum (LGM) and the timing of retreat; and 3) Develop and interpret high-resolution marine records (decadal to centuries time-scales) of changes in the character of the surface water (East Greenland Current) and bottom water (Arctic Intermediate Water) over at least the last 14ka, and how these data reflect paleoceanogrphic changes in the Arctic and North Atlantic Oceans. The core on the shelf and slope are firmly placed in a seismic stratigraphic framework both from previous surveys and during core collection in 1996. The choice of the core sites was designed to 1) test two contrasting models for the extent of glacial ice on the south-central east Greenland margin during and since the LGM and to 2) investigate the paleoceanography and ice-sheet/ocean interactions across the Denmark Strait "gateway" between the Arctic and the North Atlantic over the interval of record (the last 30 ka). The extent of the East Greenland ice margin flanking Denmark Strait during the last glaciation is virtually unknown, yet this extent and the timing of deglaciation are important parameters for understanding the past changes in ocean circulation through the Denmark Strait, and the role of this ice margin in Heinrich events, meltwater spikes, and other abrupt climate changes during the glacial period. The research thrust for the Holocene is to document paleoceanographic and glacial conditions in the fjords and on the shelf, and to compare these reconstructions with other paleoclimate data such as the ( 18( record from Renland ice core, and the "Little Ice Age" events under study from the t errestrial neoglacial record. The results of these studies will help us to understand how, why, and how quickly the environment has changed in this region during the Holocene.