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Shelf-Basin Exchange in the Chukchi Sea

楚科奇海陆架盆地交换

基本信息

批准号：
1415489
负责人：
Michael Spall
金额：
$ 34.7万
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：
2014
资助国家：
美国
起止时间：
2014-08-01 至 2017-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1415489&HistoricalAwards=false
关键词：
Shelf Basin Exchange Chukchi Sea

项目摘要

The observed ongoing decline of summer sea ice coverage in the Arctic Ocean results, in part, from heat carried by ocean waters. This heat enters the Arctic Ocean by direct solar heating and by the transport of heat with flows from the Atlantic Ocean and Bering Sea. The warm waters from the Atlantic Ocean are isolated from direct contact with the sea ice by subsurface colder waters. This project will develop a model that synthesizes our understanding of important physical processes in the Arctic Ocean, compare the model output to observations, use the model to increase understanding of the processes responsible for modulating heat flux to the sea ice, and understand the observed recent trends in those processesThe principal investigator proposes to study processes that lead to water mass transformation within the Chukchi Sea, exchange across the shelfbreak to the basin interior, and the melting of ice using a very high resolution regional numerical model in conjunction with recent and historical observations. The model is a realistically configured coupled ocean/sea ice model forced by synoptic atmospheric fields and flow through Bering Strait. Physical processes responsible for exchange of mass, heat, freshwater, and tracers across the shelfbreak will be diagnosed. The circulation and fluxes in the model will be compared with in-situ mooring and hydrographic data. The objectives of the proposed study are to better understand the processes responsible for cross shelf exchange in the Pacific sector of the Arctic Ocean, their relation to ice melt in the interior, and how they might change in a changing Arctic climate. The focus of the regional model is to diagnose the mechanisms responsible for shelf-basin exchange and relate them to the basic forcing mechanisms in this region (flow through Bering Strait and the atmosphere). The efficiency of the regional model allows for large numbers of calculations to be carried out, and for hypotheses relating to exchange to be tested. Such a process-based approach allows for a general understanding of the controlling physics with broader implications for other regions and forcing scenarios.The principal investigator teaches graduate level classes in the MIT-WHOI Joint Program in Physical Oceanography, and the material developed during this project will be incorporated into his classes. He has also been involved in the GFD summer school and will offer summer school lectures about the understanding gained from this study. Undergraduate students strong in mathematics and physics will also be recruited to work on the model analysis through the WHOI Summer Student Fellowship program at no cost to this project. The PI also maintains a web site that summarizes and highlights his research interests for a broader audience.

观测到的北冰洋夏季海冰覆盖率持续下降的部分原因是海洋沃茨携带的热量。这些热量通过直接的太阳能加热和来自大西洋和白令海的热量输送进入北冰洋。来自大西洋的温暖沃茨被地表下较冷的沃茨隔离，不与海冰直接接触。该项目将开发一个模型，综合我们对北冰洋重要物理过程的理解，将模型输出与观测结果进行比较，使用该模型增加对负责调节海冰热通量的过程的理解，并了解这些过程中观察到的最新趋势。通过一个非常高分辨率的区域数值模型，结合最近和历史的观测，研究了陆棚到盆地内部的交换以及冰的融化。该模式是一个由天气大气场和白令海峡气流强迫的真实配置的海洋/海冰耦合模式。物理过程负责交换的质量，热量，淡水和示踪剂在货架断裂将被诊断。模型中的环流和通量将与现场系泊和水文数据进行比较。拟议研究的目的是更好地了解造成北冰洋太平洋部分跨大陆架交换的过程、它们与内陆冰融化的关系以及它们在北极气候变化中可能如何变化。区域模式的重点是诊断负责陆架盆地交换的机制，并将它们与该区域的基本强迫机制（通过白令海峡和大气的流量）联系起来。区域模式的效率允许进行大量的计算，并测试与交换有关的假设。这样一个基于过程的方法允许的控制物理与其他地区和强迫scenaries.The首席研究员教研究生水平的课程在麻省理工学院-WHOI物理海洋学联合计划的影响更广泛的理解，在这个项目期间开发的材料将被纳入他的类。他还参与了GFD暑期学校，并将提供关于从这项研究中获得的理解的暑期学校讲座。在数学和物理方面很强的本科生也将被招募通过WHOI暑期学生奖学金计划在模型分析上工作，这对这个项目来说是免费的。PI还维护一个网站，为更广泛的受众总结和突出他的研究兴趣。