Collaborative Research: Overturning in the Subpolar North Atlantic - Labrador Basin and Floats

合作研究：北大西洋副极地的翻转——拉布拉多盆地和浮体

基本信息

批准号：
2017522
负责人：
Susan Lozier
金额：
$ 50.87万
依托单位：
Georgia Tech Research Corporation
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-10-01 至 2023-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2017522&HistoricalAwards=false
关键词：
Collaborative Research Overturning Subpolar North

项目摘要

Variability in the transport of heat, freshwater and mass in the North Atlantic has been linked to a number of societally relevant factors including sea level change, the melting of sea and glacial ice, and anthropogenic carbon storage in the deep ocean. However, the current understanding of the drivers of such changes is limited, making an investigation of overturning in the Sub-polar region a key ocean research priority. This field program explicitly addresses this gap. Furthermore, by engaging the larger international community studying the North Atlantic, Overturning in the Sub-polar North Atlantic Program (OSNAP) is playing a key role in catalyzing scientific progress by promoting international collaborations, synthesis, and the sharing of resources and by training future generations. Key to the latter is a network of early career scientists whose professional growth will continue to be facilitated through targeted activities that have been tested and improved during OSNAP's initial phase. Graduate students and post-docs will be trained in seagoing operations and in the processing and analysis of observational data.The overall goal of this field project, in conjunction with other measurements in the North Atlantic, is to establish determination of the linkage between intermediate and deep water formation and the overturning circulation--a connection that is present in climate models, but has yet to be observed. This project will also provide the first comprehensive view of spreading pathways for the deep waters in the Sub-polar basin. Starting in 2014, the US-led international project, Overturning in the Sub-polar North Atlantic Program (OSNAP), provides a continuous record of the full-water column, trans-basin fluxes of heat, mass and freshwater in the Sub-polar North Atlantic, in partnership with the UK, Netherlands, Canada, Germany and China. Data from the first 21 months of the full OSNAP observing system has been used to produce an initial time series of the meridional overturning, heat and freshwater fluxes for the Sub-polar basin. These preliminary results reveal a highly variable overturning in the basin, interior pathways for overflow waters, surprisingly energetic boundary current systems on timescales from days to months, and a strong overflow plume in the Iceland Basin. The additional two years of OSNAP observations will cover a time frame sufficient to make comparisons with other overturning time series and optimize the OSNAP measurement system--all necessary tasks prior to a request for longer term measurements. This component of OSNAP (OSNAP West) is for the western array across the Labrador Sea between Greenland and Canada in coordination with Germany and Canada. The sub-goal for OSNAP is to quantify the structure and transport of the West Greenland boundary current system and determine the nature of its variability and shelf-slope exchange. In addition, the overflow water pathways throughout the subpolar region and the mechanisms responsible for their variability will be studied by analyzing the subsurface float data collected since 2014 and the output of high-resolution ocean circulation 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.

北大西洋的热量，淡水和质量的运输变化与许多与社会相关的因素有关，包括海平面变化，海洋和冰川冰的融化以及深海中的人为碳存储。但是，目前对这种变化驱动因素的理解是有限的，这使得对亚极区域的倾覆是重要的海洋研究优先事项。此字段程序明确解决了此差距。此外，通过参与研究北大西洋的大型国际社会，在北大西洋亚大西洋计划（OSNAP）中推翻，通过促进国际合作，综合，资源共享和资源和资源和培训，在催化科学进步方面发挥了关键作用。后者的关键是一个早期职业科学家的网络，通过在OSNAP初始阶段经过测试和改进的有针对性活动，他们的职业发展将继续促进。研究生和DOC将在海上运营以及观察数据的处理和分析中接受培训。该现场项目的总体目标与北大西洋的其他测量结果一起，是确定中间和深水形成和深水循环之间的链接以及在气候模型中存在的连接，但可以观察到。该项目还将提供第一个全面的观点，即在亚波盆地的深水中传播途径。从2014年开始，美国领导的国际项目在北大西洋次极性北大西洋计划（OSNAP）中推翻，可连续记录全水柱，trans-basin fluxes的热量，质量，质量和淡水在北大西洋亚北大西洋上，与英国，荷兰，加拿大，德国，德国，中国和中国合作。完整OSNAP观测系统的前21个月中的数据已用于产生亚光盆地的子午倾覆，热量和淡水通量的初始时间序列。这些初步结果揭示了盆地中高度可变的倾覆，溢流水的内部途径，从几天到几个月的时间尺度上出人意料的边界电流系统以及冰岛盆地的强大溢流羽流。另外两年的OSNAP观察结果将涵盖足以与其他推翻时间序列进行比较并优化OSNAP测量系统的时间范围 - 在要求进行长期测量的请求之前，所有必要的任务。 OSNAP（OSNAP WEST）的这一组成部分是针对格陵兰岛和加拿大之间拉布拉多海的西部阵列，与德国和加拿大协调。 OSNAP的子目标是量化西格陵兰边界电流系统的结构和运输，并确定其可变性和架子 - 斜率交换的性质。此外，将通过分析自2014年以来收集的地下浮点数据以及高分辨率海洋循环模型的输出来研究整个子极区域的溢流水路以及负责变异性的机制。该奖项反映了NSF的法定任务，并通过使用该基金会的知识优点和广泛的影响来评估NSF的法定任务。