Holocene Marine Climate Evolution and Variability from Multi-Proxy Analyses of High Resolution Shelf Cores in the Northern North Atlantic (West of 20W)

该合同将使研究人员能够使用多代理方法从捕获北极和大西洋环境之间动态的地点评估环境变异性。研究的目的是确定该地区在全新世期间气候变化的范围、趋势和性质。研究策略的广泛地理范围旨在对气候系统不同组成部分的影响和复杂性进行评估。全新世的百年时间分辨率古气候记录将从1999年在对比水文环境下恢复的四个长沉积物岩心中产生。这些地点包括来自拉布拉多大陆架、冰岛西南边缘、冰岛北部大陆架和东格陵兰大陆架的岩心。在劳伦泰德、格陵兰和冰岛冰盖的最后消冰阶段，这些地点暴露在冰盖与海洋的相互作用中。这种研究将有助于更好地了解今天在北极观察到的巨大环境变化（即，海冰覆盖的明显退缩和变薄，格陵兰冰盖的融化和变薄，俄罗斯河流的流量增加）。这些当前的变化是在自然变率的范围内，还是前所未有的，可以通过保存在沉积物岩心中的数据来评估，并将它们与北大西洋北部冰冻圈-海洋相互作用的光谱进行比较。总之，这项关于高纬度大陆边缘的研究打开了一个有希望的关于过去气候变化的新档案。这项研究在教育和国际研究合作领域具有更广泛的意义，因为它将为研究生提供一个独特的机会，积极追求低于10摄氏度的水温的镁/钙温度校准。这一代用物的成功开发将对古气候学领域作出重大贡献。

This award will enable researchers to use a multi-proxy approach to evaluate environmental variability from sites capturing the dynamics between the Arctic and Atlantic environment. The goal of the research is to determine the range, trends, and nature of climate variability in the region during the Holocene. The broad geographic extent of the research strategy is designed to allow evaluation of the influences and complexities of different components of the climate system. Holocene paleoclimate records of centennial temporal resolution will be produced from four long sediment cores recovered in 1999 in contrasting hydrographic settings. The sites include cores from the Labrador Shelf, the Southwest Iceland margin, the North Iceland shelf, and the East Greenland shelf. The sites were exposed to ice-sheet/ocean interactions during the final deglaciation phases of the Laurentide, Greenland, and Iceland ice sheets.Such research would help provide an improved understanding of the dramatic environmental changes being observed in the Arctic today (i.e., marked retreat and thinning of the sea-ice cover and melting and thinning of the Greenland Ice Sheet, increased discharge of the Russian rivers). Whether these current changes are within the range of natural variability, or are unprecedented, can be evaluated by the data preserved in sediment cores and comparing them to a spectrum of cryosphere-ocean interactions in the northern North Atlantic. In summary, this research on high latitude continental margins opens a promising new archive of past climatic variability. The research has broader implications in areas of education and international research co-operation as it will provide a graduate student with a unique opportunity to actively pursue magnesium/calcium temperature calibrations for water temperatures less than 10degrees-Celsius. Successful development of this proxy would be a significant contribution to the field of paleoclimatology.