Geochemical Analysis of Ostracodes from the Arctic Ocean: Last Glacial Maximum to Present

北冰洋介形类的地球化学分析：末次盛冰期至今

• 批准号: 9400250
• 负责人: Paul Baker
• 金额: $ 6.48万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-05-15 至 1996-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9400250&HistoricalAwards=false
• 关键词: Geochemical; Analysis; Ostracodes; Arctic; Ocean

9400250 Baker Research supported by this grant is under the auspices of the Arctic Systems Science (ARCSS) Global Change Research Program and is jointly sponsored by the Division of Ocean Sciences and the Office of Polar Programs. The research will be centered around a unique and intensive, multidisciplinary research expedition to parts of the Arctic Ocean that have never been extensively studied. The 1994 U.S./Canada Arctic Ocean Section is a collaborative effort with Canada that will involve approximately 60 scientists on a Canadian and a U.S. icebreaker during summer 1994. NSF-funded projects will focus on hydrography, biology, paleo-, and sea-ice studies. Data collected will be amongst the first ever from several regions of the Arctic Ocean and will be highly relevant to improving our understanding of how the Arctic is an indicator of changing global climate conditions and how it affects the physical, chemical, and biological features of the more temperate oceans and regions. This work is a component of the collaborative paleooceanographic program. A climatic history of the Arctic Basin will be reconstructed by measuring the distribution within the sediments and certain chemical characteristics of the exoskeleton of an abundant zooplankton animal. Ostracodes secrete shells rapidly, thereby recording instantaneous physical and chemical properties of the surrounding water. This combined with frequent molts, definable magnesium-calcite compositions, and sensitive analytical methods make them a prime candidate for recording paleoceanography in cored sediments. Ostracode valves from sediments in piston and box cores will be separated by washing over a sieve, identified, and subjected to elemental and stable isotopic analysis. Calcium will be measured using flame atomic absorption spectrophotometry while strontium and magnesium will be quantified by graphite furnace atomic absorption spectrophotometry. Approximately 1,000 such measurements will be made in an effort to reconstruct deep Arctic Ocean paleocirculation and bottom water paleotemperatures, and to relate these factors to paleoproductivity, dissolved oxygen, sea ice coverage, and other parameters of the period from the last glacial maximum to the present. ***

9400250 贝克研究中心获得这项资助是在北极系统科学（ARCSS）全球变化研究计划的支持下，由海洋科学部和极地项目办公室联合资助。 该研究将围绕对北冰洋从未被广泛研究过的部分地区进行独特而密集的多学科研究考察。 1994 年美国/加拿大北冰洋部分是与加拿大合作开展的项目，1994 年夏季将有大约 60 名科学家参与一艘加拿大和一艘美国破冰船上的工作。 NSF 资助的项目将集中于水文学、生物学、古冰和海冰研究。 收集的数据将是有史以来从北冰洋几个区域收集的数据，对于提高我们对北极如何成为全球气候条件变化的指标以及它如何影响温带海洋和区域的物理、化学和生物特征的理解具有重要意义。 这项工作是古海洋学合作计划的一部分。 通过测量沉积物内的分布和丰富的浮游动物外骨骼的某些化学特征，将重建北极盆地的气候历史。 介形类能快速分泌贝壳，从而记录周围水体的瞬时物理和化学性质。 再加上频繁的蜕皮、可确定的镁方解石成分和灵敏的分析方法，使它们成为记录岩心沉积物中古海洋学的主要候选者。 活塞和箱芯沉积物中的介形阀将通过筛子清洗分离、鉴定，并进行元素和稳定同位素分析。 钙将使用火焰原子吸收分光光度法进行测量，而锶和镁将通过石墨炉原子吸收分光光度法进行定量。 将进行大约 1,000 次此类测量，以重建北冰洋深部古循环和底层水古温度，并将这些因素与古生产力、溶解氧、海冰覆盖以及从末次盛冰期至今的其他参数联系起来。 ***