Analysis of full-depth profiles of mixing observations across the Arctic Ocean

为一个为期一年的项目提供了资金，该项目包括仔细分析一套独特的实地观测资料，以表征北冰洋水域的湍流扩散、热通量和混合率。拟议的工作有可能大大增加对北冰洋混合及其对热、盐和动量通量的影响的了解，并将深入了解北冰洋混合的盆地尺度分布。这些数据还可以用于研究侵入体的厘米级结构、双扩散过程和深水地热加热。pi将产生一个完整的记录良好的数据集，包括原始数据和分析数据以及混合估计。这些数据包括微尺度温度和电导率波动以及速度剪切的剖面，分布在加拿大深部、Makarov和Amundsen盆地，以及Alpha-Mendeleyev和Lomonosov脊。它们是在2005年瑞典破冰船奥登号（Oden）穿越北极时收集的。这些新的和独特的测量数据由消耗性探针、低声学多普勒电流剖面仪和完整的水文生物地球化学程序的信息补充。初步分析表明，收集到的数据质量非常高，噪声水平低，并且在高分辨率下包含明显的强化混合特征。这些分析提供的对北冰洋源自大西洋的暖水层的垂直热通量的更好理解，应该能够同样地增强对大西洋和北冰洋之间的海洋耦合对海冰损失和气候变率的作用的理解。这些分析也可能证明对指导北冰洋未来观测活动的规划是有用的。

Winsor0612342Funds are provided for a one-year project consisting of careful analysis of a unique set of field observations leading to characterization of turbulent diffusion, heat fluxes and mixing rates in the waters of the Arctic Ocean. The proposed work has the potential to increase significantly understanding of mixing in the Arctic Ocean and its influence on fluxes of heat, salt and momentum, and will provide insight into the basin-scale distribution of mixing across the Arctic Ocean. The data also enable investigation of the centimeter-scale structure of intrusions, double-diffusive processes, and geothermal heating of the deep waters. The PIs will produce a complete well-documented data set, consisting of raw and analyzed data and mixing estimates. The data consist of profiles of microscale temperature and conductivity fluctuations, as well as velocity shear, across the deep Canada, Makarov, and Amundsen Basins, and also over the Alpha-Mendeleyev and Lomonosov Ridges. They were collected in 2005 during the trans-Arctic cruise of the Swedish icebreaker Oden. These new and unique measurements are complemented by information from expendable probes, lowered acoustic Doppler current profiler, and a full hydrographic-biogeochemical program. Preliminary analysis shows that the collected data is of very high quality, with low noise levels and contains clear signatures of intensified mixing at a high resolution. The improved understanding of vertical heat flux from the warm layer of water of Atlantic origin in the Arctic Ocean that is provided by these analyses should enable similarly enhanced understanding of the role of oceanic coupling between the Atlantic and the Arctic Oceans on sea ice loss and climate variability. The analyses may also prove useful in guiding the planning of future observational campaigns in the Arctic Ocean.