Holocene paleoceanography and climate variability in the Western Canadian Arctic Ocean: insights from**neodymium, protactinium and thorium isotopes

加拿大西部北冰洋全新世古海洋学和气候变化：来自**钕、镤和钍同位素的见解

• 批准号: 444197-2013
• 负责人: MonteroSerrano, JeanCarlos
• 金额: $ 1.09万
• 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 - Northern Research Supplement
• 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=660088
• 关键词: Holocene; paleoceanography; climate; variability; Western

The long-term objective of this northern research supplement program is to better improve the paleoceanographic interpretation of both neodymium (Nd) isotopes and sedimentary protactinium/thorium (231Pa/230Th) ratios in the Western Canadian Arctic region. This long-term objective is paramount to validate and better interpret the results of my NSERC Discovery Grant program. To achieve this goal, I plan to compare Nd-isotopes and 231Pa/230Th measurements extracted of core-top sediments, seawater and suspended particles collected from different water depths in the Western Canadian Arctic Ocean. Therefore, in the present proposal, funds are requested to cover the high costs related to acquiring these sediment cores, seawater, and suspended particles from the continental margin of the Canadian Beaufort Sea on board the Canadian Coast Guard Ships in collaboration with ArcticNet network investigators. This northern research supplement program, together with my Discovery Grant, will provide new evidence on the different processes (e.g., boundary exchange, sea ice extent, Arctic Ocean circulation) that may impact the chemistry of seawater in the Western Canadian Arctic Ocean, as well as novel data at high temporal resolution (centennial to millennial scales) that will allow reconstructing the natural evolution and variability of climatic and oceanographic conditions in the Western Canadian Arctic Ocean during the last 10,000 years. A better understanding of past climate and oceanographic variations, better future predictions and general ocean circulation model validation will help Canada's government to implement adaptation and mitigation strategies to future climate changes in the Canadian Arctic region. This Arctic research program will also contribute with the training of the Arctic specialists needed to maintain the study and stewardship of a changing Arctic Ocean. Likewise, during each Arctic expedition, several educational activities will be scheduled in the Aurora College Community Learning Centre in Inuvik, to inform the northern communities on the natural variability in the Arctic climate-ocean system during the last 10,000 years, as well as their potential trends caused by anthropogenic climate forcing.****

这项北方研究补充计划的长期目标是更好地改善加拿大西部北极地区钕（Nd）同位素和沉积镤/钍（231Pa/230Th）比值的古海洋学解释。这个长期目标对于验证和更好地解释我的NSERC发现资助项目的结果至关重要。为了实现这一目标，我计划将nd同位素与从加拿大西部北冰洋不同水深的岩心顶部沉积物、海水和悬浮颗粒中提取的231Pa/230Th测量值进行比较。因此，在本提案中，要求经费支付与加拿大海岸警卫队船上与北极网网络调查人员合作从加拿大波弗特海大陆边缘获取这些沉积物岩心、海水和悬浮粒子有关的高昂费用。这个北方研究补充计划，连同我的发现基金，将为可能影响加拿大西部北冰洋海水化学的不同过程（例如，边界交换、海冰范围、北冰洋环流）提供新的证据。以及高时间分辨率（百年至千年尺度）的新数据，这些数据将允许重建加拿大西部北冰洋在过去一万年中气候和海洋条件的自然演变和变化。更好地了解过去的气候和海洋学变化、更好地预测未来和验证一般海洋环流模式，将有助于加拿大政府实施针对加拿大北极地区未来气候变化的适应和缓解战略。这项北极研究计划还将有助于培训北极专家，以维持对不断变化的北冰洋的研究和管理。同样，在每次北极考察期间，将在因努维克的奥罗拉学院社区学习中心安排一些教育活动，向北方社区介绍过去一万年来北极气候-海洋系统的自然变化，以及人为气候强迫造成的潜在趋势。****