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.

提供的资金，以发展的机制和规模的热量传输向上从大西洋水（AW）在东部（30 oE）欧亚盆地（EB）的理解，到的地步，可以准确预测不同的横向输入AW在不同的情景下的大规模气候变率。 具体目标是：O 1。为了评估和改进由于双扩散对流（DDC）引起的热通量和盐通量的参数化，包括DDC热通量对增加的速度剪切的敏感性（例如，平均流量、潮汐）;O2.利用2007年和2009年所有可用的北极东部微结构、冰系剖面仪（ITP）和电导率-温度-深度（CTD）数据绘制DDC参数的空间分布图;O3.使用三维斜压耦合海洋/海冰模式（包括潮汐强迫）估计速度切变的空间分布; O 4。为了评估湍流混合和DDC过程中形成EB向上通量的相对作用; O 5。估计DDC和分层和剪切反馈对EB水文结构的影响（通过建模）;和O 6。为了估计横向侵入热通量，评估其在通风的海洋内部的作用。PI提出了一套现有的水文数据与精细的垂直分辨率先进的分析？微结构、CTD、ITP和MacLane系泊剖面仪？利用国际社会近十年来收集的独特的电子商务数据集。一个高分辨率的三维区域海洋模式与活跃的海冰将被用来量化上层海洋切变的平均流量，涡流和潮汐，并提供了一个工具，调查模拟通量的敏感性参数化DDC，剪切诱导湍流，DDC/剪切耦合。