Ocean convection and mixing: from signature to parameterization

海洋对流和混合：从签名到参数化

• 批准号: RGPIN-2018-03740
• 负责人: Kelley, Daniel
• 金额: $ 1.82万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680977
• 关键词: Ocean; convection; mixing; signature; parameterization

I request support for continuing research on the dynamics of ocean mixing and watermass exchange. My main interest is in key phenomena that cannot be handled directly by numerical models, owing to coarse model resolution. Dynamically-based parameterizations of such phenomena are needed for reliable numerical simulation of the ocean and climate system.******Over the funding period, my research program will build on two themes of great scientific interest and practical importance, one related to ice in the Northwest Passage and the other to watermass interactions on the Scotian Shelf. The work will be carried out with students, and the planned close collaboration with partners in Department of Fisheries and Oceans should contribute greatly to the career potential of the graduates.******Theme 1: convective heat fluxes in ice-influenced domains******My research group will study the effects of ocean turbulence and convection on ice cover in coastal waters, using fine-scale signatures acquired with an advanced profiling instrument deployed in Barrow Strait. This is in the Northwest Passage, so a key initial objective will be to improve on statistical predictions of the periods of ice cover, a prime factor for navigation. By incorporating signatures throughout the water column, the methodology will improve upon previous predictions using point-wise measurements. However, the improvement involves more than mere statistical power. We will also apply results from the turbulence literature to infer heat fluxes, and results from the convection literature to infer ice transformation. Another objective is to relate these things to the background state, to develop more robust predictions of ice cover in the study region. This work will pave the way to improved parameterizations for use in models of general ice-affected regions.******Theme 2: inference of lateral interleaving with glider-based instrumentation******Ocean gliders are used increasingly to observe coastal waters. Their zigzag profiling motion yields high spatial sampling densities that reveal ocean variations that are difficult to resolve with conventional ship-based surveys. We will take advantage of this enhanced resolution to examine fine-scale frontal features on the Scotian Shelf, with a particular focus on cross-frontal exchanges caused by quasi-lateral interleaving. My tests with glider surveys carried out over the past few years suggest the feasibility of tracking interleaving motions and associated hydrographic changes in sufficient detail to provide improved dynamical constraints on parameterizations of cross-frontal exchange. The results will deepen understanding of important issues relating to how the waters of the Nova Scotia current interact with waters derived from the Gulf Stream. The anticipated advances in sampling and analysis methodologies will also benefit studies of the many other coastal regions in which watermasses collide.

我要求支持继续研究海洋混合和水手交换的动态。我的主要兴趣是关键现象，由于模型分辨率粗糙，数值模型无法直接处理。需要对这种现象的动态参数化来对海洋和气候系统进行可靠的数值模拟。******在资助期间，我的研究计划将基于两个极大的科学兴趣和实践意义的主题，一个与西北通道中的冰有关，另一个与Scotian Shelf的水量相互作用有关。 The work will be carried out with students, and the planned close collaboration with partners in Department of Fisheries and Oceans should contribute greatly to the career potential of the graduates.******Theme 1: convective heat fluxes in ice-influenced domains******My research group will study the effects of ocean turbulence and convection on ice cover in coastal waters, using fine-scale signatures acquired with an advanced profiling instrument deployed in Barrow Strait.这是在西北通道中，因此关键的初始目标将是改善冰盖周期的统计预测，这是导航的主要因素。通过在整个水柱中纳入标志，该方法将对以前的预测进行使用点测量。但是，改进不仅仅涉及统计能力。我们还将应用湍流文献中的结果来推断热通量，并从对流文献中推断出冰的转化。另一个目的是将这些东西与背景状态联系起来，以开发研究区域中对冰盖的更强大的预测。这项工作将为改进参数化的方式铺平道路，以用于一般受冰区影响区域的模型。它们的曲折分析运动产生了高空间采样密度，这些密度揭示了海洋变化，而这些海洋变化很难通过常规的基于船舶的调查来解决。我们将利用这一增强的分辨率来检查斯科舍省架子上的细尺度额叶特征，特别关注由准上外侧交织引起的跨额外交换。在过去的几年中，我对滑翔机调查进行的测试表明，跟踪交织动作和相关水文变化的可行性足够细节，以改善对跨额外交换的参数化的动力约束。结果将加深对与新斯科舍省水域如何与从海湾流得出的水相互作用的重要问题。采样和分析方法的预期进步还将有益于水流相撞的许多其他沿海地区的研究。