New and Extended Tree-Ring Records of Temperature Variability for the Medieval Warm Period and Little Ice Age from the North American Arctic Treeline

该奖项是为了支持研究，将开发新的和扩展现有的树木年轮记录从北美北极树线。 由于树线的北方界限与北极锋的南方界限重合，因此这项工作将提供过去一千年来北极锋的空间和时间限制。 将进行实地工作，从加拿大北方和阿拉斯加收集样本。 分析将包括交叉测年，年轮宽度，最大晚材密度的测量。 所有数据都将标准化，以最大限度地提取低频气候变异性。 最后，树木年轮年表将被纳入过去温度的树木气候重建。这项拟议研究的更广泛的影响是，它将导致在一个快速的环境和气候变化的时间森林苔原生态交错带的变化和性质的信息。

This award is to support research that will develop new and extend existing tree ring records from the North American Arctic treeline. Since the northern limit of treeline coincides with the southern limit of the Arctic Front, this work will provide a spatial and temporal constraints on the Arctic Front over the last millennium. Field work will be undertaken to collect samples from northern Canada and Alaska. Analyses will include cross-dating, ring width, and measurement of maximum latewood density. All data will be standardized to maximize extraction of low frequency climatic variability. Finally, tree-ring chronologies will be incorporated into dendroclimatic reconstructions of past temperature. The broader impacts of this proposed research are that it will lead to information about the variation and nature of the forest tundra ecotone during a time of rapid environmental and climatic change.