High Resolution Paleoenvironmental Study of the Cariaco Venezuala: Late Quaternary to Present

委内瑞拉卡里亚科高分辨率古环境研究：晚第四纪至今

• 批准号: 8910667
• 负责人: Warren Prell
• 金额: $ 4.16万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-15 至 1992-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8910667&HistoricalAwards=false
• 关键词: Resolution; Paleoenvironmental; Study; Cariaco; Venezuala

High accumulation rates, the lack of bioturbation, an abundance of distinct laminae (probably varves), and the preservation of both siliceous and calcareous microfossils, make the anoxic sediments of the Cariaco Basin optimal for use in constructing high-resolution records of paleoclimatic change. During the field program piston, gravity, and box core samples of these laminated sediments will be collected. AMS radiocarbon time control and multiple paleoenvironmental proxies will be used to focus on changes in trade wind strength and hydrologic balance over the western tropical North Atlantic region during the last glacial termination, the Holocene, and the Little Ice Age. Preliminary analysis of existing data suggests that this change was large and related to global climatic change. After testing the annual nature of the sediment laminae, calibration time series of proxy data from the sediment directly against observed hydrographic and climatic data will be made. Synoptic analysis and climate model experiments will be used to understand reconstructed patterns of low latitude variability in the context of global change and to test hypothesized causes of this variability.

高积累率，缺乏生物扰动， 丰富的独特的laminae（可能是varves）， 硅质和钙质微体化石的保存， Cariaco盆地的缺氧沉积物最适合用于 建立高分辨率的古气候变化记录。 在现场计划期间， 这些层状沉积物将被收集。 AMS放射性碳 时间控制和多个古环境代理将是 用于关注信风强度的变化， 热带北大西洋西部水文平衡 在最后一次冰川终止，全新世，和 小冰河时代。对现有数据的初步分析表明， 这一变化是巨大的，与全球气候变化有关。 在测试了沉积物纹层的年度性质后， 沉积物代用数据的校准时间序列 直接对照观测到的水文和气候数据， 进行了天气分析和气候模式实验将 用来理解低纬度地区的重建模式 全球变化背景下的变异性并进行测试 这一变异性的假设原因。