Percolation in Sea Ice

* 9725038金色 这个项目是渗透理论的一个应用，渗透理论是一个基于多孔介质中流体和气体流动研究的成熟数学概念，用于研究海冰，其中间隙盐水袋影响盐和热量以及营养物和生物量的运输。 在低温和低盐水浓度下，盐水袋被分离，海冰基本上是不可渗透的，但超过约5%的临界盐水体积分数，盐水包裹体在宏观尺度上变得连接，允许海水的循环或渗透以及海水性质的扩散。 在临界盐水体积分数的过渡起着重要的作用，在空气-海冰的相互作用，在海冰的微观结构的演变，并在生活在冰的生物群落的生命周期。 逾渗理论是专门为模拟连通性变得重要的材料中的流动而开发的，它是一种强大的技术，用于研究为什么临界体积分数为5%，这是否取决于特定的冰类型，是什么决定了盐水管的间距和几何形状，过渡如何影响海冰的电磁特性，以及海冰的其他过渡特性。 该理论的应用还将使人们能够发展对海冰在电磁频谱中的反应的预测能力，这对于用卫星合成孔径雷达遥感海冰特别重要。 更一般地说，这是从数学到地球科学的一次有趣的思想交流。 ***

*** 9725038 Golden This project is an application of percolation theory, a well-developed mathematical concept based on the study of fluid and gaseous flow in porous media, to the study of sea ice where interstitial brine pockets affect the transport of salt, and heat, as well as nutrients and biomass. At low temperatures and low brine concentrations, brine pockets are separated, and sea ice is essentially impermeable, but above a critical brine volume fraction of about 5 percent, brine inclusions become connected on a macroscopic scale, allowing the circulation or percolation of sea water and the diffusion of sea water properties. The transition at the critical brine volume fraction plays an important role in air-sea-ice interactions, in the evolution of the sea ice microstructure, and in the life cycles of biological communities inhabiting the ice. Percolation theory, which was developed specifically to model flow in materials where connectedness becomes important, is a powerful technique for studying why the critical volume fraction is 5 percent, whether this is dependent on the specific ice type, what determines the spacing and geometry of brine tubes, how the transition affects the electromagnetic characteristics of sea ice, and other transition properties of sea ice. The application of the theory will also allow the development of a predictive capability for the response of sea ice in the electromagnetic spectrum, which is particularly important in the remote sensing of sea ice with satellite-based synthetic aperture radars. In more general terms, it is an intriguing cross-fertilization of ideas from mathematics to the geosciences. ***