Merging the Arctic paleoceanography into the Earth's global climate/ocean history

将北极古海洋学纳入地球的全球气候/海洋历史

• 批准号: RGPIN-2018-05031
• 负责人: HILLAIREMARCEL, Claude
• 金额: $ 4.44万
• 依托单位: Université du Québec à Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=755114
• 关键词: Merging; Arctic; paleoceanography; into; Earth

The Arctic Ocean is an important component of the climate system because of its sea-ice cover modulating energy budget through albedo, and of its exchanges with the northern Pacific and North Atlantic that play a role on the global ocean circulation. However, its history is still unresolved, notably due to i) the lack of a robust chronology from sedimentary archives, ii) difficulties in recovering such archives in the Arctic, and iii) equivocal proxy records of environmental changes. Hence merging the Arctic Ocean into the global Earth and ocean climate system remains a challenge. This is the issue I will focus on in the forthcoming years. Sediment cores recently raised from the Arctic Ocean and the subarctic seas of the North Atlantic will be used for the documenting of the status and interactions of the Arctic Ocean during recent glacial/interglacial cycles. Drill cores from the International Ocean Discovery Program (IODP) will be used for the dating of the inception of marine conditions and the subsequent evolution of the Arctic basin towards the late Cenozoic perennial sea ice cover. A strongly coordinated Canadian participation to international efforts and tight collaborations with foreign scientists, notably from Germany through the International NSERC-CREATE program on "processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic" (ArcTrain), provide the frame of the present proposal. The research planned here aims at contributing to partner studies of cores from Arctic Ocean ridges and subarctic Seas with geochemical and radiochronological investigations. The three main objectives are : i) to better constrain the age of the marine invasion of the Arctic Ocean and its Cenozoic evolution based on Rhenium-Osmium isotope studies and; ii) to set a consensual Late Quaternary chronostratigraphy of Arctic ridge records, based on the decay of Uranium series isotopes in sediments from recently recovered cores; iii) to further develop geochemical and isotopic tracers of past and present fluxes within the Arctic Ocean and towards adjacent subarctic seas during warm episodes of the past and the present warming trend. This work aims at providing critical information for climate and geochemical modelling efforts undertaken within the framework of international research initiatives supported by other funding agencies. A cohort of graduate students with state-of-the-art training in environmental isotope geochemistry and/or geochemical and climate modelling will be directly involved in the program.

北极海洋是气候系统的重要组成部分，因为它的海冰覆盖了通过反照率调节能源预算，并与北太平洋和北大西洋进行了交流，在全球海洋循环中发挥了作用。但是，它的历史仍未解决，尤其是由于i）缺乏沉积档案的稳健年表，ii）在北极恢复此类档案的困难以及iii）环境变化的模棱两可的代理记录。因此，将北极海洋融入全球地球和海洋气候系统仍然是一个挑战。这是我将在未来几年重点关注的问题。最近从北极海洋和北大西洋亚北方海洋饲养的沉积物核心将用于记录最近冰川/冰川间周期期间北极海的状态和相互作用。国际海洋发现计划（IODP）的钻芯将用于海洋条件成立的日期，以及随后北极盆地向晚期新生代多年生海冰覆盖的演变。加拿大强烈协调的加拿大参与国际努力和与外国科学家的紧密合作，尤其是来自德国的NSERC-NSERC-创建计划“北大西洋气候变化的过程和影响”计划目前的提议。这里计划的研究旨在为北极海脊和亚北极海洋的核心研究做出贡献，并进行地球化学和放射性学研究。三个主要目标是：i）更好地限制基于rhenium osmium osmium osotope研究的北极海洋侵袭及其新生代进化的年龄。 ii）基于最近回收的核心的沉积物中的铀系列同位素的衰减，建立了北极山脊记录的第四纪晚期年代地层学； iii）进一步发展北极海洋中过去和现在的地球化学和同位素示踪剂，并在过去的温暖发作和当前的变暖趋势中朝着邻近的亚北极海洋发展。这项工作旨在为在其他资金机构支持的国际研究计划框架内为气候和地球化学建模工作提供关键信息。该计划将直接参与该计划的一群研究生，并接受了环境同位素地球化学和/或地球化学和气候建模的最先进培训。