Oceanographic and Biological Implications of Arctic Sea-Ice Change: Evidence from Quaternary Benthic Foraminifers

北极海冰变化的海洋学和生物学影响：来自第四纪底栖有孔虫的证据

• 批准号: 1304755
• 负责人: Leonid Polyak
• 金额: $ 25万
• 依托单位: Ohio State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1304755&HistoricalAwards=false
• 关键词: Oceanographic; Biological; Implications; Arctic; Sea

This project will provide insights into the history of sea-ice cover and related evolution of deep-sea fauna by using newly discovered, continuous Arctic microfaunal records characterizing a transition from seasonally ice-free to perennially ice-covered and glacially-affected oceanic environments in the western Arctic. The major thrusts of the proposal will focus on (1) investigating, in detail, foraminiferal distribution along with ostracodes and related sedimentary proxies in the Early Pleistocene, the time of mostly seasonal sea ice and little glacial inputs; (2) comparing these records to correlative IODP data from the North Atlantic for a broad geographic and paleoclimatic context of at least hemispheric scale; and (3) analyzing the distribution of foraminifers and ostracodes and, by proxy, sea-ice cover during the major climatic transitions and warm intervals in the younger stratigraphy in geographically distributed cores from the western Arctic Ocean.The recently observed and ongoing changes in sea ice distribution are expected to have significant impact on endemic Arctic species. The data developed during this project will be useful to modelers trying to understand past changes in the Arctic system and predict future changes.

该项目将利用新发现的、连续的北极微型动物记录，深入了解海冰覆盖的历史和深海动物的相关演变，这些记录描述了北极西部海洋环境从季节性无冰向常年有冰和受冰川影响的海洋环境的转变。该提案的主要内容将集中于(1)详细调查早更新世与介形虫和相关沉积代用品一起的有孔虫分布，季节性海冰主要出现和冰川输入很少的时间；(2)将这些记录与北大西洋的相关IODP数据进行比较，以获得至少半个半球尺度的广泛地理和古气候背景；(3)分析了北冰洋西部地理分布的岩芯中主要气候过渡期和暖期海冰覆盖的有孔虫和介形虫的分布，以及海冰分布的近期和持续变化，预计将对北极特有物种产生重大影响。在该项目期间开发的数据将有助于建模人员试图了解北极系统过去的变化并预测未来的变化。