High Resolution Lake Sediment Studies for Paleoclimatic Reconstruction in the Canadian High Arctic

摘要ATM-9708071布拉德利，雷蒙德大学马萨诸塞州标题：高分辨率湖泊沉积物研究在加拿大高北极古气候重建 该奖项将支持一个项目，该项目旨在将加拿大北极高纬度地区的纹状沉积物夏季温度记录扩展到过去2-3000年。 这将把几个世纪以来观察到的巨大变化放在一个更长远的角度。 特别是，大约1,000年前的条件，在所谓的中世纪温暖时期，将检查其全球意义。 将使用多种测年方法来提供年代学的信心，并建立该地区的长期古地磁记录。 这可以作为一个年代模板，帮助测定其他有机碳含量低的沉积记录。 在选定的流域进行水文研究，将澄清气候对这些湖泊沉积物通量的控制，并改善对恢复的纹状沉积物记录的古气候解释。 通过将这些观测与早期工作相结合，将开发一个关于沉积物通量对北极湖泊的气候控制的综合概念模型。

Abstract ATM-9708071 Bradley, Raymond University of Massachusetts Title: High Resolution Lake Sediment Studies for Paleoclimatic Reconstruction in the Canadian High Arctic This award will support a project designed to extend the record of summer temperature derived from varved sediments in the Canadian High Arctic to cover the last 2-3000 years. This will place the dramatic changes observed over the few centuries into a longer term perspective. In particular, conditions around 1,000 years ago, during the so-called Medieval Warm Period, will be examined for its the global significance. Multiple dating approaches will be used to provide confidence in the chronology and to establish a secular paleomagnetic record for the region. This can then be used as a chronological template to help in dating other sedimentary records which are low in organic carbon. Hydrological studies in selected basins will clarify the climatic controls on sediment flux to these lakes and improve paleoclimatic interpretations of the varved sediment records recovered. By combining these observations with earlier work, a comprehensive conceptual model of the climatic controls on sediment flux to arctic lakes will be developed.