Cryosphere and East Asian monsoon variability during the latest Miocene (7-5 Ma)

最新中新世（7-5 Ma）期间的冰冻圈和东亚季风变率

• 批准号: 224193684
• 负责人: Professor Dr. Wolfgang Kuhnt
• 金额: --
• 依托单位: Arbeitsgruppe Marine Mikropaläontologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/224193684?language=en
• 关键词: Cryosphere; East; Asian; monsoon; variability

During the Neogene, Earth slowly transitioned from Greenhouse to Icehouse conditions, culminating with development of extensive Pleistocene ice sheets over the northern high latitudes. The relatively warm late Miocene period potentially offers a close analogue to understand future climate developement. We propose to develop a late Miocene (7-5 Ma) astronomically-calibrated benthic isotope stratigraphy in a sedimentary splice constructed from carbonate-rich successions drilled at ODP Site 1146 in the South China Sea. High-resolution planktic stable isotopes will be measured in the same samples to contrast the temporal evolution of surface and bottom water masses in the subtropical West Pacific and to evaluate potential repercussions of the Messinian „salinity crisis“ (5.96 – 5.33 Ma) on the Southeast Asian monsoon. Our isotopic records will also provide important information about the pace and magnitude of climate change and main forcing mechanisms during a warmer interval of Earth’s history. Our work will be integrated with published isotope data from ODP Site 1146 to generate a methodology-consistent chronological reference for the last 16 million years. Analysis of this continuous and coherent climate archive in a single core will provide constraints on the development of Northern and Southern Hemisphere ice sheets, subtropical monsoonal climate and major re-organizations in inter-ocean circulation, and will thus contribute to our understanding of climate-ocean dynamics.

在新近纪，地球缓慢地从温室过渡到冰窖，最终在北部高纬度地区形成了广泛的更新世冰原。相对温暖的中新世晚期可能为理解未来的气候发展提供了一个接近的类比。我们建议在南海ODP站点1146钻探的富碳酸盐层序的沉积拼接中建立一个晚中新世（7-5 Ma）天文校准的底栖同位素地层学。在相同的样品中测量高分辨率浮游生物稳定同位素，以对比副热带西太平洋表面和底部水团的时间演变，并评估迈西尼亚“盐度危机”（5.96 - 5.33 Ma）对东南亚季风的潜在影响。我们的同位素记录还将提供有关气候变化的速度和幅度以及地球历史上较暖时期的主要强迫机制的重要信息。我们的工作将与ODP站点1146公布的同位素数据相结合，以生成过去1600万年的方法一致的时间参考。对这一连续和连贯的气候档案的分析将为南北半球冰盖的发展、亚热带季风气候和海洋间环流的主要重组提供约束条件，从而有助于我们对气候-海洋动力学的理解。