Oxygen pathways into the deep ocean: investigating boundary current ventilation in the western Irminger Sea

进入深海的氧气通道：调查伊尔明格海西部的边界流通风

• 批准号: 2122579
• 负责人: Isabela Le Bras
• 金额: $ 71.06万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2122579&HistoricalAwards=false
• 关键词: Oxygen; pathways; into; deep; ocean

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).This proposal would fund recovery of deployed oxygen sensors on the OSNAP moorings in the western boundary current of the Irminger Sea, along with deep calibration casts upon recovery, and subsequent processing and analysis of the data. The purpose is to measure O2 that ventilates the deeper boundary current through several pathways leading from the near surface ocean exposed to the atmosphere, into the deeper boundary current, and to investigate the processes responsible. In so doing, the project will also provide information about the pathways of dissolved atmosphere-derived CO2 from the near surface ocean to the deep. Carbon dioxide uptake in the subpolar North Atlantic is thought to significantly mitigate global warming, but as global warming continues, ventilation may decline, potentially weakening this CO2 sink and also reducing oxygen levels throughout the Atlantic. A lack of direct observations of dissolved gases has limited accurate budgeting and hindered understanding of the processes which govern the sequestration of gases into the deep ocean. These results may apply to other ocean regions and inform dissolved gas coupling in ocean and climate models. Broad use of these data will be promoted, to fuel additional advances in the ocean chemistry, ecology, and climate dynamics of this critical region. The project will support an early career female Hispanic/Latina scientist and a graduate student, along with several outreach activities, including documentation of at-sea experience through a blog and interaction with URM student groups.Carbon dioxide uptake in the subpolar North Atlantic is thought to significantly mitigate global warming; moreover, oxygen uptake in this region prevents large scale hypoxia throughout the North Atlantic. As global warming continues, convection is expected to decline, potentially weakening this CO2 sink and reducing oxygen levels throughout the Atlantic. However, a lack of direct observations of dissolved gases, particularly in winter and in boundary current regions, has limited accurate budgeting and has hindered our understanding of the processes which govern the sequestration of gases into the deep ocean. Careful calibration and analysis of these valuable new O2 observations is planned, to emphasize an understanding of the dynamics underlying boundary current ventilation and interior-boundary current exchange. Science question addressed are: 1) How effectively does slantwise convection directly ventilate boundary currents? 2) How much oxygen reaches the Irminger Sea’s boundary current through the draining of Labrador Sea Water (LSW) from the interior? 3) To what extent does LSW entrainment set the high oxygen levels in Denmark Strait Overflow Water (DSOW)? These results may apply to other ocean regions and inform dissolved gas coupling in ocean and climate models.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.

该奖项的全部或部分资金根据《2021 年美国救援计划法案》（公法 117-2）提供。该提案将资助修复伊尔明格海西部边界流 OSNAP 系泊处部署的氧气传感器，以及深度校准在恢复后进行，并对数据进行后续处理和分析，目的是测量通过从暴露于大气的近地表海洋到更深边界流的几条通道通入更深边界流的氧气，在此过程中，该项目还将提供有关大气中溶解的二氧化碳从近地表海洋到深层的二氧化碳吸收路径的信息，该路径被认为可以显着缓解全球变暖。但随着全球变暖，通风可能会减弱，从而可能削弱二氧化碳汇，并降低整个大西洋的氧气水平。由于缺乏对溶解气体的直接观测，准确的预算有限，并阻碍了对控制气体封存过程的理解。深海。可能适用于其他海洋区域，并促进海洋和气候模型中溶解气体耦合的广泛使用，以推动这一关键区域的海洋化学、生态和气候动力学的进一步进步。早期职业女性西班牙裔/拉丁裔科学家和研究生，以及多项外展活动，包括通过博客记录海上经验以及与 URM 学生团体的互动。北大西洋近极地的二氧化碳吸收被认为可以显着缓解全球变暖此外，该区域的摄氧量随着全球变暖的持续，对流预计会减弱，从而可能削弱整个大西洋的二氧化碳汇并降低氧气水平，但缺乏对溶解气体的直接观测，特别是在冬季和边界地区。目前的地区，准确的预算有限，阻碍了我们对控制气体封存到深海的过程的理解，计划对这些有价值的新的 O2 观测进行仔细的校准和分析，以强调对边界流通风的动态的理解。和内部边界电流交换。解决的科学问题是：1）倾斜对流如何有效地直接通风边界电流？2）有多少氧气通过从内部排出拉布拉多海水（LSW）到达伊尔明格海的边界电流？ LSW 夹带在多大程度上导致丹麦海峡溢流水 (DSOW) 中的高氧含量？这些结果可能适用于其他海洋区域，并为海洋和气候模型中的溶解气体耦合提供信息。该奖项反映了通过使用基金会的智力价值和更广泛的影响审查标准进行评估，NSF 的法定使命被认为值得支持。

项目成果

Slantwise Convection in the Irminger Sea

伊尔明格海的倾斜对流

• DOI: 10.1029/2022jc019071
• 发表时间: 2022-10
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Le Bras, I. A. ‐A.;Callies, J.;Straneo, F.;Biló, T. C.;Holte, J.;Johnson, H. L.
• 通讯作者: Johnson, H. L.

Labrador sea water spreading and the Atlantic meridional overturning circulation

拉布拉多海水扩散与大西洋经向翻转环流

• DOI: 10.1098/rsta.2022.0189
• 发表时间: 2023-12-11
• 期刊: Physical and Engineering Sciences
• 作者: Le Bras, Isabela Alexander-Astiz