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

基本信息

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

项目摘要

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.

哥伦比亚高原的帕鲁斯（Palouse）黄土中的五个地点跨越了最后75,000年（通过当前冰川间冰期的最后一个冰川周期），将以描述和采样。地点的序列将形成一个生物气候从约200毫米到700毫米的降水，温暖到凉爽的温度，然后灌木叶到森林。 tephrosonology，土壤地层学和热发光日期将提供位点之间的时间顺序控制和相关性。稳定的同位素地球化学和丰富的蛋白石植物岩和稳定的土壤形成的碳酸钙的同位素地球化学将产生有关植物覆盖率，植物群落类型和时间温度的波动的信息。位点地层学和微形状（土壤显微镜），古溶质的物理和化学特性将产生黄土繁聚和侵蚀周期的解释，土壤发育以及改变植被和气候与土壤形成过程和景观进化的关系。对古颜色和黄土的磁敏感性的测量将作为对中国黄土开发的气候代理模型的关键测试。上面的子项目将被合成为5,000至10,000年时间切片的定量描述模型，直到最后75,000年。两个较长的地层部分可以追溯到175,000年。 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代理记录。