Global Change: COLLABORATIVE RESEARCH: Geologic & Pedologic Record of Climate and Vegetation in Pleistocene Palouse Loess, Pacific, Northwest

全球变化：合作研究：地质

• 批准号: 9219148
• 负责人: Eugene Kelly
• 金额: $ 11万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219148&HistoricalAwards=false
• 关键词: Global; Change; COLLABORATIVE; RESEARCH; Geologic

Five sites in the Palouse Loess of the Columbia Plateau, that each span the last 75,000 yr (the last glacial cycle through the current interglacial), will be mapped in exposures, described, and sampled. The sequence of sites will form a bioclimatic transect from about 200 mm to 700 mm precipitation, warm to cool temperature, and shrub-steppe to forest. Tephrochronology, soil stratigraphy, and thermoluminescence dating will provide chronological control and correlation among sites. The stable isotope geochemistry and abundances of opal phytoliths and the stable isotope geochemistry of soil-formed calcium carbonates will yield information about fluctuations in plant cover, plant community type, and temperature through time. Site stratigraphy and the micromorphology (soil microscopy), physical, and chemical properties of paleosols will yield interpretations of loess aggradation and erosion cycles, of soil development, and of relationships of changing vegetation and climate to soil-forming processes and landscape evolution. Measurement of magnetic susceptibility of paleosols and loess will serve as a critical test of the climate proxy model developed from Chinese loess. The sub projects above will be synthesized into a quantitative descriptive model of change in 5,000 to 10,000 year time slices through the last 75,000 yr. Two longer stratigraphic sections that date back to 175,000 yr B.P. then will be sampled and analyzed using the same techniques to reconstruct the record of the penultimate glacial-interglacial cycle Project goals are to provide direct information on changes in climate and vegetation, to quantify region-wide responses of the pedologic, sedimentologic, and hillslope-geomorphic systems to those changes, to further document a losess-based proxy record of activity of the Cordilleran Ice Sheet, and to test several climate proxy records.

在哥伦比亚高原的帕卢塞黄土中的五个地点， 跨越过去75，000年（最后一次冰川循环通过电流 间冰期），将绘制曝光，描述和采样。 这些地点的顺序将形成一个生物气候样带， 200毫米至700毫米降水量，温暖到凉爽的温度， 灌木草原到森林 灰岩年代学，土壤地层学， 热释光测年将提供年代控制， 网站之间的相关性 稳定同位素地球化学和 蛋白石植硅体丰度及其稳定同位素地球化学 土壤中形成的碳酸钙的含量将提供有关 植被、植物群落类型和温度的波动 穿越时空 场地地层和微形态（土壤 显微镜），物理和化学性质的古土壤将 黄土沉积和侵蚀循环的产量解释， 土壤发展，以及植被变化和 气候到土壤形成过程和景观演变。 古土壤和黄土磁化率的测定， 作为气候代理模型的关键测试， 中国黄土 上述子项目将被合成为一个 5,000 - 10,000年变化的定量描述模型 时间在过去的75,000年里一片一片地流逝 两个较长的地层 然后将对可追溯到175，000年B. P.的部分进行采样， 使用相同的技术进行分析，以重建 倒数第二次冰期-间冰期旋回 项目的目标是提供有关 气候和植被，以量化整个区域的反应， 土壤、沉积和山坡地貌系统， 这些变化，以进一步记录基于损失的代理记录， 活动的科迪勒拉冰盖，并测试几个气候 代理记录