SGER: Use of Novel Biogeochemical Techniques on Core Sediments from the Tibetan Plateau

SGER：新型生物地球化学技术在青藏高原岩心沉积物中的应用

• 批准号: 0732701
• 负责人: Richard Ricketts
• 金额: $ 2.29万
• 依托单位: University of Minnesota Duluth
• 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 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0732701&HistoricalAwards=false
• 关键词: SGER; Use; Novel; Biogeochemical; Techniques

This SGER will support preliminary analyses of sediment cores (covering approximately the last 18,000 years) recovered from a remote, high-elevation Tibetan lake - Peiku Co. The PI will use novel biogeochemical techniques (TEX86 and MBT/CBT), as well as emerging high-resolution (= 2mm) sedimentological analyses (utilizing a XRF core scanner) to complement climatic interpretations based on standard stable isotope techniques. This will facilitate future work on sedimentary archives taken from lakes in a part of the world where long, high-resolution lacustrine records are extremely difficult to obtain.The specific objectives of the present proposal are:a) To apply three novel biogeochemical proxies to sedimentary material from Peiku Co in order to provide quantitative estimates of past temperature changes on the Tibetan Plateau;b) To measure the elemental composition of core sediment, in order to provide information about the sedimentology of cores from the lake; andc) To establish a preliminary chronology for the sediment cores, using short-lived radioisotopes and AMS radiocarbon dating.

该SGER将支持沉积物岩心的初步分析（涵盖了大约18,000年的时间），从一个偏远的高海拔西藏湖泊--北库湖（Peiku Co.）中发现。PI将使用新的地球化学技术（TEX 86和MBT/CBT），以及新兴的高分辨率（= 2 mm）沉积学分析（利用X射线荧光岩心扫描仪），以补充基于标准稳定同位素技术的气候解释。这将有助于今后在世界上很难获得长时间、高分辨率湖泊记录的地区进行湖泊沉积档案的工作。本建议的具体目标是：a）将三种新的地球化学代用指标应用于北库错的沉积物，以提供青藏高原过去温度变化的定量估计; B）测量岩芯沉积物的元素组成，以提供关于该湖岩芯沉积学的资料;和c）利用短寿命放射性同位素和AMS放射性碳测年法，初步确定沉积物芯的年代。