Eastern Arctic Climate of the Past 2,000 Years: The Varved Lake Sediment Record

人们对北极十年至百年尺度气候变化的模式和原因知之甚少，最重要的是因为该地区过去环境变化的年度记录很少。该奖项支持检索巴芬岛跨越过去500至2000年的气候记录网络。岩心将从三个湖泊中采集。VARVE年表将使用210-铅和BUMP放射性核素进行严格的测试。将生成化石花粉、沟槽厚度和Ge/Si比值的年度时间序列。这项工作将从北冰洋湖泊沉积物中产生第一个按年计算的古气候和古生态时间序列网络。该项目将是首个绘制过去1000年来十年至百年变化模式的项目(北极湖和河口的古气候)。

The patterns and causes of arctic decade- to century-scale climate variability are poorly understood, most significantly because annually-dated records of past environmental change from this region are sparse. This award supports the retrieval of a Baffin Island network of climate records spanning the last 500 to 2000 years. Cores will be collected from three lakes. The varve chronologies will be tested rigorously using 210-Pb and bomb radionuclides. Annually-dated time series of fossil pollen, varve thickness, and Ge/Si ratios will be generated. This effort will yield the first network of annually-dated paleoclimate and paleoecological time series from arctic lake sediments. This project will be the first PALE (Paleoclimates for Arctic Lakes and Estuaries) effort to map out the patterns of decade-to century- scale change of the past 1000 years.