Percolation in Sea Ice

*9725038黄金这个项目是渗流理论的一个应用，渗流理论是一个成熟的数学概念，基于对多孔介质中流体和气体流动的研究，在海冰的研究中，间隙卤水口袋影响盐分、热量以及营养物质和生物量的传输。在低温和低卤水浓度下，卤水口袋是分开的，海冰基本上是不渗透的，但在大约5%的临界卤水体积分数以上，卤水包裹体在宏观尺度上变得相互联系，允许海水的循环或渗透和海水性质的扩散。临界卤水体积分数处的转变在海-气-冰相互作用、海冰微结构的演化以及冰上生物群落的生命周期中起着重要的作用。渗流理论是专门为连接性变得重要的材料中的流动建模而开发的，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，是什么决定了卤水管的间距和几何形状，转变如何影响海冰的电磁特性，以及海冰的其他转变属性。该理论的应用还将使人们能够发展对电磁频谱中海冰响应的预测能力，这在利用卫星合成孔径雷达对海冰进行遥感方面尤为重要。更笼统地说，这是从数学到地球科学思想的有趣交融。***

*** 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. ***