Collaborative Research: TransArctic Paleoclimate of the Eocene

合作研究：始新世跨北极古气候

• 批准号: 0806228
• 负责人: Roger Summons
• 金额: $ 36.83万
• 依托单位: Massachusetts Institute of Technology
• 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=0806228&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.

提供了资金，用于在横跨北极的始新世野外地点应用由阿克塞尔·海伯格陆地化石首席调查员开创的稳定同位素技术。首席调查员将从北极东部(阿克塞尔·海贝格和埃尔斯米尔岛，2008年)、北极西部(班克斯岛，2009年)和阿拉斯加安克雷奇附近(2010年)取回化石材料。实地考察和对这些地点的沉积物和植物/脊椎动物化石的分析将提供始新世北部高纬度古气候的全球量化。除了开创性地用于化石木材、纤维素、树脂、有机物和碳酸盐的ä13C、ä18O和äD技术外，他们还将应用两项新的化学技术：在从纤维素中提取的苯基葡萄糖苷中使用ä18O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(GDGTS)的脂质生物标志物来推断土壤温度。他们预计，他们的分析将对全球始新世北极样带的有机碳循环、土壤温度、大气相对湿度、环境水源和天气模式的推断进行量化。这些分析是专门为开发北极始新世沉积物中保存极为完好的木乃伊树木和凋落物层的陆地有机化合物而设计的。