Past modes of Arctic climate variability from varved sediments

北极是加拿大受全球变暖影响最严重的地区。加拿大政府需要更好地了解和评估这些变化目前对水生和陆地环境的影响，并估计未来的情况。这项研究旨在通过化石记录重建过去的气候和环境。这些数据用于测试和验证用于预测未来气候条件的气候模型。我们研究了北极湖泊底部积累的沉积物，在有利的情况下，每年都会留下一层独特的沉积物。他们用电子显微镜和扫描仪进行分析，以高分辨率检索化学成分，从而可以重建每年的平均温度或/和降水量。我们打算研究2个地点，这将有可能使我们获得最长的（8000年），每年解决高北极记录。这项提议的目的是支持在努纳武特的埃尔斯米尔岛进行实地工作的高昂费用，以获得沉积物岩心和解释所需的仪器数据。

The Arctic is the region of Canada that is the most affected by global warming. The Government of Canada needs to better understand and evaluate what are the current impacts of these changes on aquatic and terrestrial environments and to estimate future conditions. This research aims to look at the fossil record to reconstruct the climate and the environment of the past. These data are used to test and validate the climate models that are used to predict future climate conditions. We look at the sediments that accumulate at the bottom of the arctic lakes and that leave - in favorable situation - a distinct layer for each year. Their analyses with an electron microscope and a scanner that retrieve the chemical composition at high resolution allow to reconstruct the mean temperature or/and the precipitation for each year. We intend to study 2 sites that will potentially enable us to obtain the longest (8000 years), annually resolved records of the High Arctic. This proposal aims to support the high costs of conducting the fieldwork on Ellesmere Island, Nunavut, for obtaining the sediment cores and the instrumental data needed for their interpretation.