Collaborative Research: TransArctic Paleoclimate of the Eocene

合作研究：始新世跨北极古气候

• 批准号: 0804627
• 负责人: Jaelyn Eberle
• 金额: $ 31.39万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0804627&HistoricalAwards=false
• 关键词: Collaborative; Research; TransArctic; Paleoclimate; Eocene

Funds are provided to apply the stable isotope techniques pioneered by the principal investigators for Axel Heiberg terrestrial fossils across a Trans-Arctic trajectory of Eocene field sites. The principal investigators will retrieve fossil materials from the Eastern High Arctic (Axel Heiberg and Ellesmere Island; 2008), the Western High Arctic (Banks Island; 2009), and near Anchorage, Alaska (2010). Fieldwork and the resulting analyses of sediments and plant/vertebrate fossils across these sites will provide global quantification of Eocene northern high-latitude paleoclimate. In addition to the ä13C, ä18O and äD techniques pioneered for fossil wood, cellulose, resin, organic matter and carbonate, they will apply two new chemical techniques: the use of ä18O in phenylglucosazone derived from cellulose to imply the oxygen isotope composition of environmental water, and the use of lipid biomarkers known as glycerol dialkyl glycerol tetraethers (GDGTs) to infer soil temperature. They anticipate that their analyses will yield a quantification of organismal carbon-cycling, soil temperature, atmospheric relative humidity, environmental water source and inference of weather pattern, across a global Eocene Arctic transect. These analyses are specifically designed to exploit the exceptionally well-preserved terrestrial organic compounds of the mummified trees and litter layers within Arctic Eocene sediments.

提供资金，以应用稳定同位素技术开创了阿克塞尔海伯格陆地化石横跨跨北极轨迹的始新世现场的主要调查人员。主要研究人员将从北极东部高纬度地区（阿克塞尔海伯格和埃尔斯米尔岛; 2008年）、北极西部高纬度地区（班克斯岛; 2009年）和阿拉斯加安克雷奇附近（2010年）检索化石材料。通过对这些地点的沉积物和植物/脊椎动物化石进行实地考察和分析，将提供全球始新世北方高纬度古气候的量化结果。除了在化石木材、纤维素、树脂、有机物和碳酸盐中率先采用的碳同位素技术外，他们还将采用两种新的化学技术：在纤维素衍生的苯基葡糖腙中使用碳同位素技术来推断环境水的氧同位素组成，以及使用被称为甘油二烷基甘油四醚（GDGT）的脂质生物标志物来推断土壤温度。他们预计，他们的分析将在全球始新世北极样带中量化生物碳循环，土壤温度，大气相对湿度，环境水源和天气模式的推断。这些分析是专门设计的，以利用保存非常完好的陆地有机化合物的木乃伊树木和枯枝落叶层内的北极始新世沉积物。