Collaborative Research: Millennial Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change

合作研究：干谷湖泊的千年尺度波动：对区域气候变率和半球间气候变化同步性的影响

• 批准号: 0124049
• 负责人: Glenn Berger
• 金额: --
• 依托单位: Nevada System of Higher Education, Desert Research Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0124049&HistoricalAwards=false
• 关键词: Collaborative; Research; Millennial; Scale; Fluctuations

0124049BergerThis award supports a project to add to the understanding of what drives glacial cycles. Most researchers agree that Milankovitch seasonal forcing paces the ice ages but how these insolation changes are leveraged into abrupt global climate change remains unknown. A current popular view is that the climate of Antarctica and the Southern Ocean leads that of the rest of the world by a couple thousand years at Termination I and by even greater margins during previous terminations. This project will integrate the geomorphological record of glacial history with a series of cores taken from the lake bottoms in the Dry Valleys of the McMurdo Sound region of Antarctica. Using a modified Livingstone corer, transects of long cores will be obtained from Lakes Fryxell, Bonney, Joyce, and Vanda. A multiparameter approach will be employed which is designed to extract the greatest possible amount of former water-level, glaciological, and paleoenvironmental data from Dry Valleys lakes. Estimates of hydrologic changes will come from different proxies, including grain size, stratigraphy, evaporite mineralogy, stable isotope and trace element chemistry, and diatom assemblage analysis. The chronology, necessary to integrate the cores with the geomorphological record, as well as for comparisons with Antarctic ice-core and glacial records, will come from Uranium-Thorium, Uranium-Helium, and Carbon-14 dating of carbonates, as well as luminescence sediment dating. Evaluation of the link between lake-level and climate will come from hydrological and energy-balance modelling. Combination of the more continuous lake-core sequences with the spatially extensive geomorphological record will result in an integrated Antarctic lake-level and paleoclimate dataset that extends back at least 30,000 years. This record will be compared to Dry Valleys glacier records and to the Antarctic ice cores to address questions of regional climate variability, and then to other Southern Hemisphere and Northern Hemisphere records to assess interhemispheric synchrony or asynchrony of climate change.

0124049Bergerthis奖支持一个项目，以增加对驱动冰川周期的理解。 大多数研究人员都同意，米兰科维奇季节性强迫加快了冰河时代的速度，但是如何将这些暴发的变化借给突然的全球气候变化仍然未知。当前的一个流行观点是，南极洲和南方海洋的气候在终止I时带领世界其他地区的气候使世界其他地区的气候在终止终止时更大的利润率。 该项目将将冰川历史的地貌记录与来自南极洲McMurdo Sound地区干山谷中的湖底底部捕获的一系列核心。使用改良的利文斯通·科勒（Livingstone Corer），将获得长核的样带，将从湖泊，邦尼，乔伊斯和万达获得湖泊。 将采用一种多参数方法，旨在从干山谷湖泊中提取最大数量的以前的水位，冰川和古环境数据。水文变化的估计将来自不同的代理，包括晶粒尺寸，地层，蒸发矿物质学，稳定的同位素和痕量元素化学和硅藻组合分析。 将核心与地貌记录整合在一起所必需的年表，以及与南极冰核和冰川记录的比较，将来自铀 - 硫代基因，铀巢和碳酸盐含量，以及碳酸盐的碳14级，以及发光沉积物的日期。 评估湖泊水平与气候之间的联系将来自水文和能量平衡建模。 更连续的湖核序列与空间广泛的地貌记录的结合将导致南极综合的湖泊水平和古气候数据集延伸至少30，000年。该记录将与干谷冰川记录和南极冰芯进行比较，以解决区域气候变化的问题，然后与其他南半球和北半球记录进行比较，以评估半球间的同步或气候变化的异步。