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

Am-9708071布拉德利，马萨诸塞州雷蒙德大学标题：高分辨率湖泊沉积物研究用于重建加拿大北极高原的古气候该奖项将支持一个项目，该项目旨在将加拿大北极高原各种沉积物的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戏剧性变化放在更长远的角度来看。特别是，将审查大约1000年前所谓的中世纪暖期的条件，以确定其全球意义。将使用多种测年方法来提供对年代学的信心，并建立该区域的长期古地磁记录。然后，这可以作为年表模板，帮助测定其他有机碳含量较低的沉积记录的年代。对选定盆地的水文研究将澄清气候对这些湖泊沉积物通量的控制，并改进对恢复的各种沉积物记录的古气候解释。通过将这些观测与以前的工作相结合，将开发一个气候控制北极湖沉积物通量的综合概念模型。

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.