Collaborative Research: P2C2: Water Isotopes in Peat Mosses as Proxies for Understanding Climate and Atmospheric Circulation Changes in Southern Patagonia

这项授予利哈伊和布朗大学的奖项将开发和测试一种强大的技术，利用泥炭苔藓中的两种水同位素重建大气环流模式和水分轨迹。这项研究将产生重要的气候记录，可能会改变我们对相对研究较少的南半球过去1000年气候动态的理解。这种方法也适用于该地理区域的较长时间尺度上，以及其他可以找到泥炭藓的地方。来自研究不足的巴塔哥尼亚南部的新气候记录将提供一个基准数据集，用来评估用于预测未来气候变化的气候模型。该项目将培训两所大学的研究生和本科生在创新的跨学科研究中应用最先进的技术。该奖项将使用同位素记录来记录和了解上个千年的气候和大气环流变化，方法是采用新的双水同位素方法，并对保存在最南端巴塔哥尼亚(南美洲南部)泥炭沼泽中的单一物种泥炭苔藓(Sphagnum)进行系统的现代校准。调查人员将在巴塔哥尼亚南部进行校准采样和分析，以跨越大纬度和降水梯度。同位素记录将来自利哈伊大学现有的泥炭岩心。除了使用来自纤维素和脂类的氧和氢同位素时间序列来进行常规？通过对古气候的解释，该小组将探索使用衍生的重氢过量(增量过量)作为水分来源区域条件和水分轨迹的示踪剂。这种双(O和D)同位素的创新使用将提供有关过去大气环流和观测到的气候变化机制的强大信息。

This award to Lehigh and Brown Universities will develop and test a powerful technique to reconstruct atmospheric circulation patterns and moisture trajectories using two water isotopes from peat mosses. The research will generate important climate records that will potentially transform our understanding of climate dynamics of the last 1000 years in the relatively understudied southern hemisphere. This approach is also applicable over longer time scales in this geographic regions, as well as other places Sphagnum moss can be found. The new climate records from under-studied southern Patagonia will provide a benchmark data set with which to evaluate the climate models that are used for projecting future climate change. The project will train graduate and undergraduate students at both institutions in the application of a state-of-art technology in innovative interdisciplinary research. This award will use isotope records to document and understand climate and atmospheric circulation changes in the last millennium using a novel dual water isotope approach and systematic modern calibration from single species peat mosses (Sphagnum) as preserved in peat bogs in southernmost Patagonia (southern South America). The investigators will carry out calibration sampling and analysis to span large latitude and precipitation gradients in southern Patagonia. The isotope records will be derived from the existing peat cores at Lehigh University. In addition to using oxygen and hydrogen isotope time series from cellulose and lipids for ?conventional? paleoclimate interpretations, the team will explore the use of derived deuterium excess (delta-excess) as a tracer for moisture source region conditions and moisture trajectories. This innovative use of dual (O and D) isotopes would provide powerful information regarding past atmospheric circulation and mechanisms of observed climate changes.