Holocene paleoceanography and climate variability in the Western Arctic Ocean

北冰洋西部的全新世古海洋学和气候变化

• 批准号: 418199-2013
• 负责人: MonteroSerrano, JeanCarlos
• 金额: $ 2.04万
• 依托单位: Université du Québec à Rimouski
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=660089
• 关键词: Holocene; paleoceanography; climate; variability; Western

The Arctic Ocean is a sensitive responder to climate changes as well as active driver of global and regional atmospheric and oceanic circulation patterns. In order to document long-term natural climate cycles and predict future climate trends for the Arctic Ocean, one needs to reconstruct the oceanic dynamics locked in sedimentary records in which hydrologic and oceanographic responses to climatic changes are represented by the variability of sedimentary and geochemical tracers. Among these tracers, the clay minerals (e.g., illite, kaolinite, chlorite and smectite), radiogenic isotopes [e.g., neodymium (Nd), lead (Pb) and strontium (Sr)] and sedimentary protactinium-231/thorium-230 (231Pa/230Th) records from marine sediments are useful tools for paleoceanographic and paleoclimatic reconstructions. Under this context, the overall objective of this research program is to use a powerful multi-proxy approach combining clay mineral composition, elemental geochemistry, radiogenic isotope compositions (Nd, Pb and Sr) in both the clay-size fraction and authigenic (seawater-derived) ferromanganese coatings, and sedimentary 231Pa/230Th ratios from identical sediment core samples from the continental margins of the Canadian Beaufort and Chukchi seas, in order to document Holocene changes in continental inputs, deep-Arctic circulation and current transport related to climate change. Hence, because Holocene sedimentation rates in the continental margins of the Canadian Beaufort and Chukchi seas reach up to 120 cm/ka, this innovative research program will offer a unique opportunity to reconstruct the natural evolution and variability of climatic and oceanographic conditions in the Western Arctic Ocean during the last 10,000 years at decadal to millennial timescales. These results not only will help to significantly advance our understanding on the future Arctic climate and oceanographic dynamics, but will also provide high temporal resolution data that will help to better constrain the regional climate models. Finally, this unique pool of mineralogical and geochemical tools will also offer a dynamic training environment for highly qualified personnel with access to expertise in different fields of marine geology and geochemistry.

北极海洋是对气候变化以及全球和区域大气和海洋循环模式的主动驱动力的敏感响应者。为了记录长期自然气候周期并预测北极海洋的未来气候趋势，需要重建锁定在沉积记录中的海洋动力学，其中水文和海洋学对气候变化的反应由沉积和地球化学示踪剂的变异性代表。在这些示踪剂中，粘土矿物质（例如，伊利石，高岭石，氯酸盐和蒙特矿），放射异位同位素[重建。在这种情况下，该研究计划的总体目标是在结合粘土矿物质成分，元素地球化学，放射异位同位素组成（ND，PB和SR）中使用强大的多种方法，在粘土尺寸的分数和身份典型的（海水衍生）属于Ferromanganese coatings和Sedients statients satefort and sedigrets and Sediferes 23031pa sateforts clay simize smize simber和airsigent cartiofe clay尺寸分数中为了记录大陆投入，深度北极流通和与气候变化相关的当前运输的全新世变化，加拿大博福特和丘奇海的边缘。因此，由于加拿大Beaufort和Chukchi海洋大陆边缘的全新世沉淀率达到120 cm/ka，因此这项创新的研究计划将提供一个独特的机会，可以在过去10,000年的十，000年中，在十，000年的千年时代，在西部北极大洋中重建气候和海洋学条件的自然发展和可变性。这些结果不仅将有助于大大提高我们对未来北极气候和海洋学动态的理解，而且还将提供高度的时间分辨率数据，从而有助于更好地限制区域气候模型。最后，这种独特的矿物学和地球化学工具库还将为高素质的人员提供动态的培训环境，并在海洋地质学和地球化学不同领域获得专业知识。