Collaborative Research: Unraveling the post-Pliocene Arctic Ocean transition to the icehouse climate

合作研究：揭示上新世后北冰洋向冰室气候的过渡

• 批准号: 1003740
• 负责人: Brian Haley
• 金额: $ 5.33万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1003740&HistoricalAwards=false
• 关键词: Collaborative; Research; Unraveling; post; Pliocene

Funds are provided to allow the PIs to develop a continuous record of changes in the Arctic Ocean in response to climatic cooling and growth of ice sheets in the Early to Middle Pleistocene based on sediment cores from the western Arctic Ocean. They will utilize a suite of proxies (microfaunal assemblages, stable and radiogenic isotopes, biomarkers, sediment mineralogy and elemental composition and grain size) to reconstruct variations in glacial inputs, sea ice, and water circulation. The use of paleobiological and geochemical proxies will be greatly enhanced by a unique sediment core that has a rich calcareous microfossil record extending through most of the Quaternary and potentially into the Pliocene, unlike other cores from the Arctic Ocean. This is a unique find that they can capitalize on as Arctic cores typically preserve calcareous microfossils only in Late Quaternary sediments. Age control will be achieved by paleomagnetic, 10Be, Sr-isotope, and cyclostratigraphic methods. This research will allow them to test whether there was an overall progressive growth in ice sheets and sea-ice cover and if sea ice and continental glaciers changed synchronously. They will also test whether the Mid Pleistocene Transition led to the growth of a super-thick Laurentide Ice Sheet by analyzing changes in glacial inputs from the northern Laurentide margin, with a multi-century scale record for the threshold glaciation ca. 650 ka, which initiated the icehouse world.

提供了资金，以使PIS根据来自西部北极海洋的沉积物核心，在早期至中新世的气候冷却和冰盖生长中，在北极海洋中不断变化的记录。他们将利用一套代理（微孔组合，稳定和放射异位素，生物标志物，沉积物矿物学以及元素组成以及晶粒尺寸）来重建冰川输入，海冰和水循环的变化。与北极海洋中的其他核心不同，独特的沉积物核心将大大增强古生物学和地球化学代理的使用将大大增强，该核心具有丰富的钙质微化石记录，该记录延伸到大多数季季，并可能进入上新世，这也是如此。这是一个独特的发现，它们可以利用为北极岩心，通常仅在晚期沉积物中才能保留钙质的微化石。年龄控制将通过古磁，10BE，SR-同位素和环形学方法来实现。这项研究将使他们能够测试冰盖和海冰覆盖物以及海冰和大陆冰川是否同步变化的整体渐进式增长。他们还将测试更新世过渡是否通过分析北劳伦特北部边缘的冰川输入的变化来导致超厚的月桂赛冰盖的生长，并具有跨越阈值冰川的跨度尺度记录。 650 ka，发起了冰屋世界。