The Arctic-Atlantic gateway of the Northwest Passage: oceanic exchange, paleoceanography, paleoclimate, proxy calibration and refinement

我的研究小组致力于确定自上一个冰河时代（~ 22000年前）至今，加拿大北极地区的海洋环境如何随着气候变化而变化。该研究项目的重点是西北航道（NWP）——大西洋和太平洋之间通过加拿大北极群岛（CAA）的浅水通道的历史路线——是从北冰洋到北大西洋的热量和水运输的关键门户。该地区受到最近气候变化的影响，经历了季节性海冰覆盖减少等显著变化。这种变化迫切需要加拿大的管理，为日益重要的社会和经济问题作出贡献。因此，我及时的研究计划将产生与北极社区和决策者高度相关的新知识，以扩大NWP的使用，因为进一步的气候变化使该地区为广泛的船舶交通打开了大门。***这项研究计划的主要目的是显著提高我们对该地区大冰盖最后一次消亡后，CAA如何以及何时成为北极-大西洋通流门户的基础知识，并提高我们对极地群岛过去和最近如何应对气候变化的理解。另一个目标是将NWP最近的环境变化纳入长期地质记录，并确定是否存在可识别的相似性。这项研究需要一种综合的方法，利用基于船舶的实地研究（海洋沉积物岩心及其包含的生物和生物地球化学信息）和海洋学模型来跟踪海洋通流建立的时间和方式，并表征当时的环境条件（海冰覆盖、水温、生态系统生产力）。这些数据用于确定控制北大西洋网关连通性的因素。为了帮助解释来自海洋岩心的证据（延伸到遥远的过去）并提供现代背景，该计划还将生成关于表面海底沉积物（代表当今）的生物和生物地球化学特征的有价值的数据集。***这个拟议的项目代表了一种创新的、综合的和及时的研究方法，以研究作为全球海洋门户的极地群岛的长期海洋学和气候发展。这些知识是在北冰洋范围内了解极地对气候变化的反应的先决条件。该计划将培训12名HQP，并为他们提供海洋地质、生物地球化学和微古生物学技术方面的宝贵技能。此外，学生将获得现场规划、管理技能方面的专业知识，并获得远程工作经验，为他们在学术界、工业界和政府中担任领导角色做好准备

My research group works to determine how the marine environments of Arctic Canada have changed in response to climate change since the last Ice Age (~22,000 years ago) to the present. The focus of this research program, the Northwest Passage (NWP) – the historical route between the Atlantic and Pacific oceans via the shallow channels of the Canadian Arctic Archipelago (CAA) – is a crucial gateway for heat and water transport from the Arctic Ocean to the North Atlantic. This region has been affected by recent climate change, experiencing pronounced shifts such as decreasing seasonal sea-ice cover. Such changes urgently require Canadian stewardship to contribute to issues of growing social and economic importance. As such, my timely research program will generate new knowledge highly relevant to Arctic communities and decision makers in anticipation of expanded NWP use, as further climate change opens up this region for extensive ship traffic.***The principal objective of this research program is to significantly advance our fundamental knowledge of how and when the CAA became a gateway for Arctic-Atlantic ocean throughflow after the last demise of the great ice sheets in this region, and to improve our understanding of how polar archipelagos respond to climate change both in the past and recently. Another objective is to place recent NWP environmental changes into the long-term geological record and determine whether there are identifiable similarities. This research requires an integrated approach that uses ship-based field studies (marine sediment cores and their included biological and biogeochemical information) with oceanographic modeling to track the timing and style of establishment of oceanic throughflow and to characterize the prevailing environmental conditions (sea-ice cover, water temperatures, ecosystem productivity). These data are used to determine factors controlling Arctic-Atlantic gateway connectivity. To aid in interpreting evidence from marine cores (extending into the distant past) and provide a modern context, this program will also generate valuable data sets on biological and biogeochemical characteristics of surface seabed sediments (which represent the present day). ***This proposed program represents an innovative, integrated and timely research approach to studying the long-term oceanographic and climatic development of polar archipelagos serving as global ocean gateways. Such knowledge is a pre-requisite for an Arctic Ocean-wide understanding of polar responses to climate change. This proposed program will train 12 HQP and provide them with invaluable skills in marine geological, biogeochemical and micropaleontological techniques. Additionally, students will gain expertise in field planning, management skills and gain experience working in remote settings, preparing them to take on leadership roles in academia, industry, and government.**