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

9400254克拉克研究由该补助金支持的是在北极系统科学（ARCSS）全球变化研究计划的主持下，由海洋科学司和极地计划办公室联合赞助。 该研究将围绕一个独特的和密集的，多学科的研究考察北冰洋的部分地区，从来没有被广泛研究。 1994年美国/加拿大北冰洋科是与加拿大的一项合作努力，将有大约60名科学家在1994年夏季乘坐一艘加拿大和一艘美国破冰船。 NSF资助的项目将侧重于水文学、生物学、古生物学和海冰研究。 收集的数据将是北冰洋几个地区有史以来的第一批数据，将有助于我们更好地了解北极如何成为全球气候变化的指标，以及它如何影响更温和的海洋和地区的物理，化学和生物特征。 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，以获得对海洋化学，生物学和物理学相互作用的见解。 将从航行期间收集的沉积物和水样中获得稀土元素和钕同位素测量结果，并将用于确定组成北冰洋的不同水团的起源。 还将获得有关海水分层、混合过程、环流和海洋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与其他现有的稀土元素和钕同位素数据从亚北极海洋的背景下，并被纳入现有的全球，大洋间环流模型。 冰载和海底沉积物的铅，稀土元素和Nd-Pb-Sr同位素的分析将允许晚新生代北冰洋沉积物地球化学的整合，目前的沉积物来源和分散在北冰洋的理解。 ***

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. ***