Collaborative Research: Management and Implementation of US GEOTRACES GP17 Section: Amundsen Sea Sector of the Antarctic Continental Margin (GP17-ANT)

合作研究：美国GEOTRACES GP17部分的管理和实施：南极大陆边缘阿蒙森海段（GP17-ANT）

• 批准号: 2023230
• 负责人: Phoebe Lam
• 金额: $ 54.22万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-01-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2023230&HistoricalAwards=false
• 关键词: Collaborative; Research; Management; Implementation; US; Collaborative; Research; Management; Implementation; US

This project will support the management and implementation of a 60-day research cruise to the Amundsen Sea sector of the Antarctic continental margin to collect samples for measurements of a broad suite of trace elements and isotopes (“TEIs”), as part of the U.S. GEOTRACES program. GEOTRACES is a global effort in the field of Chemical Oceanography, the goal of which is to understand the distributions of trace elements and their isotopes in the ocean. Determining the distributions of these elements and isotopes will increase the understanding of processes that shape their distributions and also the processes that depend on these elements. Key TEIs include essential micronutrients such as iron and zinc; “tracers” such as aluminum, manganese, and isotopes of nitrogen, thorium and neodymium that can be used to investigate modern and ancient ocean processes; and elements such as lead that are indicative of human activities. In the Southern Ocean, the Antarctic continental margins are important as sources of micronutrient trace elements such as iron, which is required to support biological production and carbon export over the Antarctic shelf and in offshore waters of the Antarctic Circumpolar Current. Moreover, these regions are experiencing rapid environmental changes that are expected to impact oceanic circulation and biogeochemical cycles, for which TEIs provide crucial data needed to test and refine numerical models of the Earth system. The Amundsen Sea sector holds particular interest because of the pronounced, decadal-scale increases in the melting rates of glacial ice shelves that border the region, driven by intrusions of warm Circumpolar Deep Water onto the continental shelf. This melting has potentially major impacts on global sea level, on the formation of Antarctic Bottom Water in the Ross Sea, and on the regional ecosystem. The cruise will comprise essential sampling operations (collection and shipboard processing) and ancillary measurements (hydrography, nutrients, algal pigments) in support of multiple, individual science projects, following the successful model of previous U.S. GEOTRACES cruises in the Atlantic, Pacific and Arctic ocean basins. The cruise will sample the ocean region between 100°W and 135°W, with stations ranging from 67°S in the Antarctic Circumpolar Current southward to the Amundsen Sea continental shelf, including stations adjacent to several rapidly melting ice shelves and in highly-productive shelf polynyas. Water column samples will be collected using conventional and trace-metal clean CTD-rosette systems, in-situ high-volume pumps, and a towed fish sampler or small boat, using established methods. Sampling time will also be provided for collection of sea ice, floating glacial ice, and seafloor sediments. To facilitate coordination with a complementary open-ocean cruise and ensure access to the study region to document the impact of biological processes, the cruise is planned for late austral summer (late January-late March). Beyond the disciplinary contributions, the proposed research will contribute knowledge concerning the cryosphere and its impacts on global sea level and ocean circulation, regional ecosystems and biological processes, ocean-atmosphere interactions, and past and future environmental change. The project will contribute to STEM education and outreach through the participation of an NSF-funded PolarTREC education professional, and a K-12 STEM program for students from underserved and underrepresented schools run by Rutgers University education specialists. To foster public engagement, the investigators will partner with the UCSC Science Communication Program to engage freelance science journalists to profile research in this spectacular and harsh Antarctic environment.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目将支持和实施60天的研究巡游，向南极连续边距的Amundsen海洋部门收集样本，以测量广泛的微量元素和同位素（“ TEIS”），这是美国Geotraces计划的一部分。 Geotraces是化学海洋学领域的全球努力，其目的是了解痕量元素及其同位素在海洋中的分布。确定这些元素和同位素的分布将增加对塑造其分布的过程以及取决于这些元素的过程的理解。关键的TEI包括铁和锌等必需的微量营养素； “示踪剂”，例如铝，锰和同位素的氮，th or和neododymium，可用于研究现代和古老的海洋过程；以及指示人类活动的铅等因素。在南大洋中，南极大陆边缘作为微量营养素痕量元素（例如铁）的来源很重要，这是支持在南极货架上以及在南极圆极电流的近海水域上支持生物产生和碳出口所必需的。此外，这些区域正在经历快速的环境变化，这些变化有望影响海洋循环和生物地球化学周期，TEI提供了测试和完善地球系统数字模型所需的重要数据。阿蒙森海洋部门引起了特别的兴趣，这是由于与该地区的冰川冰架的熔融速率显着的，十年级的尺度增加，这是由温暖的圆形深水进入大陆架子的侵入。这种熔化可能对全球海平面，罗斯海中南极底水以及区域生态系统产生重大影响。巡航将包括基本的抽样操作（收集和船板处理）以及辅助测量（水文，营养素，藻类色素），以支持多个单个科学项目，遵循以前的美国地质架子在大西洋，太平洋和北极海洋鲈鱼中的成功模型。巡航将在100°W和135°W之间采样海洋区域，其站点从南极循环极电流的67°S向南到Amundsen Sea CONTIALENT架子，包括与几个快速融化的冰架子相邻的站点，以及在高生产力的架子上。水柱样品将使用常规和痕量金属清洁的CTD-Rosette系统，原位高容量泵以及使用既定的方法（使用既定的方法）收集。还将提供采样时间，以收集海冰，浮冰冰和海底沉积物。为了促进完整的开放海洋巡游协调，并确保进入研究区域以记录生物过程的影响，计划在澳大利亚夏季（1月下旬三月）进行巡航。除纪律贡献外，拟议的研究还将贡献有关冰冻圈及其对全球海平面和海洋循环，区域生态系统和生物学过程，海洋 - 大气相互作用以及过去和未来环境变化的影响。该项目将通过NSF资助的Polartrec教育专业人员的参与以及由Rutgers University教育专家经营的服务不足和代表性不足的学校的K-12 STEM计划，为STEM教育和宣传做出贡献。为了促进公众参与，调查人员将与UCSC科学传播计划合作，以吸引自由科学记者在这个壮观而Harmh的南极环境中介绍研究。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响审查标准，通过评估来诚实地支持支持。