Collaborative Research: Upper ocean heat flux in the Eurasian Basin: Oceanic thermodynamic forcing contributing to Arctic ice loss

合作研究：欧亚盆地上层海洋热通量：海洋热动力强迫导致北极冰损失

• 批准号: 1249182
• 负责人: Laurence Padman
• 金额: $ 54.42万
• 依托单位: Earth and Space Research
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1249182&HistoricalAwards=false
• 关键词: Collaborative; Research; Upper; ocean; heat

Funds are provided to develop understanding of the mechanisms and magnitude of heat transport upward from the Atlantic Water (AW) in the eastern (30oE) Eurasian Basin (EB), to the point where accurate projections can be made for varying lateral input of AW under different scenarios of large-scale climate variability. Specific objectives are:O1. To evaluate and improve parameterizations of heat and salt fluxes due to double-diffusive convection (DDC) including the sensitivity of DDC heat fluxes to added velocity shear (e.g., mean flow, tides);O2. To map the spatial distribution of DDC parameters using all available eastern Arctic microstructure, Ice-Tethered Profiler (ITP) and Conductivity-Temperature-Depth (CTD) data for 2007 and 2009;O3. To estimate the spatial distribution of velocity shear using a 3D baroclinic, coupled ocean/sea-ice model including tide forcing;O4. To evaluate the relative roles of turbulent mixing and DDC processes in shaping EB upward fluxes;O5. To estimate impact of DDC and feedbacks with stratification and shear on the hydrographic structure of the EB (via modeling); andO6. To estimate the lateral intrusive heat fluxes, assessing their role in ventilating the ocean interior.The PIs propose advanced analyses of a suite of existing hydrographic data with fine vertical resolution ? microstructure, CTD, ITP and MacLane moored profilers ? taking advantage of the unique EB dataset collected over the recent decade by the international community. A high-resolution 3D regional ocean model with active sea ice will be used to quantify upper ocean shear from mean flow, eddies and tides, and provide a tool for investigating sensitivity of modeled fluxes to parameterizations of DDC, shear-induced turbulence, and DDC/shear coupling.

提供了资金，以发展对东部（30oe）欧亚盆地（EB）的大西洋水（AW）向上向上传输的机理和幅度的理解，以便可以在不同气候变化的不同情况下对AW的横向输入进行准确的预测。 具体目标是：O1。评估和改善由于双扩散对流（DDC）引起的热和盐通量的参数化，包括DDC热通量对增加速度剪切的敏感性（例如，平均流量，潮汐）； o2。使用所有可用的东北极微观结构，冰螺旋剖面（ITP）和2007年和2009年的电导率 - 温度深度（CTD）数据绘制DDC参数的空间分布。使用3D斜压，耦合的海洋/海冰模型，包括潮汐强迫； o4。评估湍流混合和DDC过程在塑造EB向上通量中的相对作用； O5。估计DDC的影响和通过分层和剪切的反馈对EB的水文结构（通过建模）的影响； Ando6。为了估计横向侵入热通量，评估它们在通风内部的作用。微观结构，CTD，ITP和Maclane系泊剖面？利用国际社会最近十年收集的独特EB数据集。具有活性海冰的高分辨率3D区域海洋模型将用于量化平均流量，涡流和潮汐的上海剪切，并提供了一种工具，用于研究建模通量对DDC参数化的敏感性，剪切诱导的湍流和DDC/剪切偶联。