Nd, Sr and Pb Isotope, Major Cation, and Rare Earth Element Geochemistry of the Arctic Ocean

9400254克拉克研究由这笔赠款资助，由北极系统科学全球变化研究计划赞助，由海洋科学部和极地方案办公室联合赞助。这项研究将围绕着对北冰洋从未被广泛研究的部分进行一次独特的、密集的、多学科的研究考察。1994年美国/加拿大北冰洋部分是与加拿大的一项合作努力，将有大约60名科学家在1994年夏天在一艘加拿大破冰船和一艘美国破冰船上工作。NSF资助的项目将集中在水文地理学、生物学、古生物和海冰研究上。从北冰洋几个地区收集的数据将是有史以来最早的数据之一，对于增进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较温和海洋和地区的物理、化学和生物特征的理解，将具有非常重要的意义。这项具体的研究工作涉及稀土元素(REE)和ND同位素系统学的研究，以深入了解海洋化学、生物学和物理学之间的相互作用。将从邮轮期间收集的沉积物和水样中获得稀土、稀土和钕同位素测量结果，并将用于确定构成北冰洋的不同水团的来源。还将获得关于海水分层、混合过程、循环和生物地球化学过程的起源和维持的信息。此外，这些数据将使北冰洋能够与来自北冰洋次海洋的其他现有稀土和钕同位素数据放在一起，并纳入现有的全球大洋间环流模型。对冰载和海底沉积物中的铅、稀土和钕铅锶同位素的分析将使晚新生代北冰洋沉积物的地球化学与目前对北冰洋沉积物来源和扩散的了解相结合。***

9400254 Clark 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 specific research effort involves the study of rare-earth element (REE) and Nd isotope systematics in order to gain insights on the interplay of ocean chemistry, biology, and physics. REE, and Nd isotope measurements will be obtained from sediment and water samples collected during the cruise and will be used to determine the origin of different water masses comprising the Arctic Ocean. Information will also be derived on the origin and maintenance of the seawater stratification, mixing processes, circulation, and biogeochemical processes. In addition, these data will allow the Arctic Ocean to be placed in context with other existing REE and Nd isotope data from the sub-Arctic oceans and to be integrated into existing global, inter-oceanic circulation models. Analysis of ice-borne and seabed sediments for Pb, REE, and Nd-Pb-Sr isotopes will allow integration of Late Cenozoic Arctic Ocean sediment geochemistry to the current understanding of sediment sources and dispersal in the Arctic Ocean. ***