Cenzoic Paleoceanographic and Climate Development of the Antarctic Region Based on Oceanic Sediment Sequences

基于海洋沉积序列的南极地区新生代古海洋学和气候发展

• 批准号: 9218720
• 负责人: James Kennett
• 金额: $ 28.5万
• 依托单位: University of California-Santa Barbara
• 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: 1993-02-15 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218720&HistoricalAwards=false
• 关键词: Cenzoic; Paleoceanographic; Climate; Development; Antarctic

This award supports a continuing investigation of the oxygen and carbon isotopic composition and biostratigraphy of marine sedimentary sequences from the circum-Antarctic oceans. These studies are aimed at reconstructing the paleoclimatic, paleoceanographic, and biotic evolution of the Antarctic region during the Cenozoic. Oceanographic and climatic evolution since the middle Eocene (the last 52 million years) consists largely of progressive cooling and glaciation of the polar regions and perhaps warming in the tropics. The climatic and glacial evolution of polar regions, including Antarctica, is crucial to our understanding of long term global climatic change because high latitudes are among the most sensitive regions to externally driven change. Strong feedback mechanisms involving ice albedo and bottom water formation contribute to the development of polar regions. The Cenozoic marine stratigraphic record is largely the product of this climate evolution at high latitudes and hence it is crucial to have the most complete record possible. This investigation will add to the record of proxy climate and environmental indicators by using existing Ocean Drilling Program (ODP) cores. For the Paleogene (Paleocene through Oligocene), work will focus on cores from ODP Legs 113, 119, and 120. For the Neogene (Oligocene through present), work will focus on ODP cores from low and middle latitudes in the southwest and equatorial Pacific. This work will contribute significantly to a general understanding of the role of polar regions in global climatic change. In addition, this work will contribute to our understanding of the significance of the Circum-Antarctic Current in Antarctic and global climate processes. This work is particularly relevant in addressing the important question about the stability of the marine-based ice sheet of West Antarctica.

该奖项支持继续调查环南极海洋的海洋沉积序列的氧和碳同位素组成和生物地层学。这些研究旨在重建南极地区新生代的古气候、古海洋和生物演化。始新世中期(过去的5200万年)以来的海洋和气候演变主要包括极地地区的逐渐冷却和冰川作用，可能还有热带地区的变暖。包括南极洲在内的极地地区的气候和冰川演化对于我们理解长期的全球气候变化至关重要，因为高纬度地区是对外部驱动变化最敏感的地区之一。涉及冰反照率和底水形成的强反馈机制有助于极地区域的发展。新生代海洋地层记录在很大程度上是这种高纬度气候演变的产物，因此拥有尽可能完整的记录是至关重要的。这项调查将通过使用现有的大洋钻探计划(ODP)岩芯来增加替代气候和环境指标的记录。对于古近纪(古新世至渐新世)，工作重点将放在ODP113、119和120段的岩心上。对于新近纪(渐新世至今)，工作重点将放在西南部和赤道太平洋中低纬度的ODP柱上。这项工作将大大有助于全面了解极地地区在全球气候变化中的作用。此外，这项工作将有助于我们理解环南极流在南极和全球气候过程中的重要意义。这项工作对于解决有关南极洲西部海洋冰盖稳定性的重要问题特别重要。