Establishing the Onset and History of Perennial Sea Ice in the Arctic

确定北极常年海冰的形成和历史

• 批准号: 0550109
• 负责人: Dennis Darby
• 金额: $ 30.6万
• 依托单位: Old Dominion University Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-02-15 至 2010-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0550109&HistoricalAwards=false
• 关键词: Establishing; Onset; History; Perennial; Sea

Core material recovered from the Lomonosov Ridge during the 2004 IODP Arctic Coring Expedition (ACEX) will be used to reconstruct the history of sea ice in the Arctic Ocean through application of the iron oxide fingerprinting technique. This method permits researchers to trace the origin of detrital sediments to specific regions of the circum-Arctic Ocean. Hypothesizing that seasonal ice and perennial ice deliver sediments to the Lomonosov Ridge from different locations and distances, the researchers will conduct exhaustive analyses of continuous core sections dating back to 15-17 Ma and other core sections that cover the period from ~44 Ma back to Paleocene time to infer the patterns of perennial and seasonal ice represented in the cores. The results will provide constraints not only on Arctic sea ice history and paleoclimate, but also on paleocirculation patterns. Such information is critical for more accurate reconstruction of paleoclimate scenarios and better prediction of future climate change. Broader impacts include the critical contributions this research will make to Arctic climate history and the analysis of the unique IODP ACEX cores, collaboration with Canadian and European researchers, and training of undergraduate and graduate students.

2004年国际海洋学项目北极取芯考察期间从罗蒙诺索夫海岭回收的芯材将用于通过应用氧化铁指纹技术重建北冰洋海冰的历史。 这一方法使研究人员能够追踪到环北冰洋特定区域的碎屑沉积物的来源。 假设季节性冰和常年冰将沉积物从不同的位置和距离运送到罗蒙诺索夫海岭，研究人员将对可追溯到15-17 Ma的连续核心部分和其他核心部分进行详尽的分析，这些核心部分涵盖了从~44 Ma到古新世的时间，以推断核心中代表的常年和季节性冰的模式。 研究结果不仅对北极海冰历史和古气候，而且对古环流模式提供了约束。 这些信息对于更准确地重建古气候情景和更好地预测未来气候变化至关重要。 更广泛的影响包括这项研究将对北极气候历史和独特的IODP ACEX核心的分析，与加拿大和欧洲研究人员的合作以及本科生和研究生的培训做出重要贡献。