Large-Eddy Simulation of Turbulence Under Sea Ice and ArcticLeads

这个研究项目是一个名为北极海洋表面热收支（SHEBA）的大型、协调的、多研究者项目的关键组成部分。SHEBA项目将在一年的周期内同时测量大气、浮冰和上层海洋的各种通量和特性，这些通量和特性决定了北极海冰的总质量和能量预算。其目标是提高对冰雪覆盖的北冰洋如何以及在多大程度上影响低纬度地区和全球气候模式（GCMs）的气候变化的认识。为了实现这一目标，已经挑选出两个可能重要的辐射/气候反馈过程进行研究：冰反照率反馈和云辐射反馈。这个项目代表了一个过程建模的努力，以检查浮冰和铅下上层海洋的详细湍流结构。这项工作通过提供一种解释和分析在引线和冰袋下采集的数据的方法，增加了SHEBA项目的实地工作。这项研究的结果将有助于阐明湍流和海冰如何在极地海洋中相互作用，并将有助于建立基于物理的冰覆盖混合层参数化。海冰的热力学模型将与现有的三维海洋大涡模拟模型耦合，该模型可以解决混合层中相当一部分湍流涡尺度。该项目有三个主要目标：1)确定冰和铅下湍流漩涡的时空尺度；2)研究海洋混合层湍流与海冰形成和衰减之间的关系；3)量化混合层作为北冰洋热储的作用。通过将模拟实验的结果与SHEBA的观测结果相结合，该研究将有助于建立对北极上层海洋海冰过程的强有力的物理理解，可用于开发和测试改进的参数化。

9703539 Skyllingstad This research project is a key component of a large, coordinated, multi-investigator program called SHEBA (Surface Heat Budget of the Arctic) Ocean. The SHEBA program will simultaneously measure, over an annual cycle, the various fluxes and properties of the atmosphere, ice pack, and upper ocean that determine the aggregate mass and energy budgets of Arctic sea ice. Its goal is improved understanding of how and to what extent, the ice covered Arctic Ocean affects climate variability in lower latitudes and in global climate models (GCMs). Towards that goal, two potentially important radiation/climate feedback processes have been singled out for study: Ice-Albedo Feedback and Cloud-Radiation Feedback. This project represents a process modeling effort to examine the detailed turbulent structure of the upper ocean under pack ice and leads. The work augments the field work of the SHEBA program by providing a method for interpreting and analyzing data taken in leads and under the ice pack. Results from this study will help clarify how turbulence and sea ice interact in the polar oceans, and will aid in the construction of physically-based parameterizations of the ice covered mixed layer. A thermodynamic model of sea ice will be coupled to an existing three-dimensional ocean large-eddy simulation model that resolves a significant portion of the turbulent eddy scales in the mixed layer. The project has three main objectives: 1) to determine the temporal and spatial scales of turbulent eddies beneath ice and leads, 2) to examine the relationship between ocean mixed layer turbulence and sea ice formation and decay, and 3) to quantify the role that the mixed layer has as a heat reservoir for the Arctic Ocean. By combining the results of the modeling experiments with observations from SHEBA, the study will help establish a strong physical understanding of upper ocean sea ice processes in the Arctic that can be used to develop and test improved parameterizations.