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

该SGER将支持从遥远的高海拔西藏湖泊- Peiku Co恢复的沉积物岩心（覆盖大约18,000年）的初步分析。PI将使用新的生物地球化学技术（TEX86和MBT/CBT），以及新兴的高分辨率（= 2mm）沉积学分析（利用XRF岩心扫描仪），以补充基于标准稳定同位素技术的气候解释。这将有助于今后对从世界上某个地区的湖泊中采集的沉积档案进行研究，因为那里很难获得长时间、高分辨率的湖泊记录。本文的具体目标是：a)利用三种新的生物地球化学指标对青藏高原北库错沉积物质进行定量估计；b)测量岩心沉积物的元素组成，以提供湖泊岩心沉积学的信息；(c)利用短寿命放射性同位素和AMS放射性碳定年法，建立沉积物岩心的初步年代学。

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.