ESH - Paleoclimatic Significance of the Wucheng Loess in China

ESH - 中国婺城黄土的古气候意义

• 批准号: 9710051
• 负责人: Kenneth Verosub
• 金额: $ 20.06万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 2001-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9710051&HistoricalAwards=false
• 关键词: ESH; Paleoclimatic; Significance; Wucheng; Loess

9710051 Verosub Three important elements of Earth Systems History are Milankovitch forcing, Tibetan uplift and global ice volume. A terrestrial record of the interaction of these three elements can be found in the paleoclimatic record of the Chinese loess plateau. However, most studies of the Chinese loess and associated paleosols have dealt with the upper two-thirds of this 2.6 million year-long sequence. The lower one-third, known as the Wucheng Formation, has a very different physical appearance, and the data that are available suggest that its pedogenic and magnetic properties are also different from the upper two-thirds. These differences are believed to reflect the increasing influence of the Tibetan uplift as well as a shift from Milankovitch forcing dominated by obliquity and precession to one dominated by eccentricity. This proposal represents a request for support to undertake fundamental pedogenic, sedimentologic, and mineral magnetic investigations of the Wucheng Formation with the goal of deciphering its paleoclimatic history. We believe that such a study will serve as an important counterpoint to studies of the rest of the Chinese loess/paleosol sequence, that it will significantly improve our ability to interpret the paleoclimate record of the entire sequence, that it will provide new insights about the coupling between marine and terrestrial climate, and that it will lead to new opportunities to test computer models of atmospheric and oceanic circulation.

小行星9710051 地球系统史的三个重要要素是米兰科维奇强迫、西藏隆升和全球冰量。 在黄土高原的古气候记录中，可以找到这三种元素相互作用的陆地记录。 然而，大多数对中国黄土和相关古土壤的研究都是针对这个长达260万年的序列的上三分之二。 下三分之一，被称为吴城组，有一个非常不同的物理外观，现有的数据表明，它的成壤和磁性也不同于上三分之二。 这些差异被认为是反映了西藏隆起的影响越来越大，以及从米兰科维奇强迫为主的偏心率和岁差为主的转变。 这一建议代表了一个请求，支持进行基本的成壤，沉积学和矿物磁性调查的吴城组的目标是破译其古气候的历史。 我们相信，这样的研究将作为中国黄土/古土壤序列的研究的一个重要的对位，它将显着提高我们的能力来解释整个序列的古气候记录，它将提供新的见解海洋和陆地气候之间的耦合，它将导致新的机会来测试大气和海洋环流的计算机模型。