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.

提供资金用于加深对从欧亚盆地 (EB) 东部 (30oE) 的大西洋水 (AW) 向上传输热量的机制和程度的了解，以便能够对不同的 AW 横向输入进行准确的预测大规模气候变化的不同情景。 具体目标是：O1。评估和改进双扩散对流 (DDC) 引起的热通量和盐通量的参数化，包括 DDC 热通量对附加速度剪切的敏感性（例如，平均流量、潮汐）；O2。使用 2007 年和 2009 年所有可用的东部北极微观结构、冰系系剖面仪 (ITP) 和电导率-温度-深度 (CTD) 数据绘制 DDC 参数的空间分布图；O3。使用 3D 斜压耦合海洋/海冰模型（包括潮汐强迫）估计速度切变的空间分布；O4。评估湍流混合和 DDC 过程在形成 EB 向上通量中的相对作用；O5。估计 DDC 以及分层和剪切反馈对 EB 水文结构的影响（通过建模）；和O6。估算横向侵入热通量，评估其在海洋内部通风中的作用。PI 提出对一套具有精细垂直分辨率的现有水文数据进行高级分析？微观结构、CTD、ITP 和 MacLane 系泊剖面仪 ?利用国际社会近十年来收集的独特 EB 数据集。具有活动海冰的高分辨率 3D 区域海洋模型将用于量化平均流量、涡流和潮汐产生的上层海洋剪切力，并提供一种工具来研究模拟通量对 DDC、剪切引起的湍流和 DDC 参数化的敏感性/剪切耦合。