Mushy-layer growth and convection, with application to sea ice
Mushy-layer growth and convection, with application to sea ice
复制标题
糊状层生长和对流，应用于海冰
DOI：
--
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
J. Parkinson
中科院分区：
文献类型：
--
作者：
A. Wells;Joseph Hitchen;J. Parkinson
海冰是一种由冰晶和液态盐水组成的反应性多孔介质，这是糊状层的一个例子。海冰的相行为控制着不断变化的物质特性和通过多孔冰的流体输送，从而影响到冰的生长、冰中的盐水排出为极地海洋提供浮力通量以及海冰的地球化学。我们回顾了在间隙液中密度梯度驱动的糊状层和对流的生长工作。在介绍了糊层理论的基本原理之后，我们讨论了糊层的有效热性质，包括盐输运对糊层生长的影响。我们提出了一个简化的模型，扩散控制的糊状层与适度的冷却与溶质凝固点抑郁症的增长。对于从一个冷的等温边界的增长，盐扩散修改mushy-layer增长约5-20%，这取决于远场的温度和盐度。我们还回顾了工作的发病，空间定位和非线性发展的对流糊状层，突出最近的工作瞬态凝固和模型的非线性对流与溶解固体无盐水通道。最后，未来的研究机会被确定，出于地球物理观测冰的增长。这篇文章是“冰的物理和化学：从生命的可行性到行星的形成，跨越尺度的脚手架”主题的一部分。
Sea ice is a reactive porous medium of ice crystals and liquid brine, which is an example of a mushy layer. The phase behaviour of sea ice controls the evolving material properties and fluid transport through the porous ice, with consequences for ice growth, brine drainage from the ice to provide buoyancy fluxes for the polar oceans, and sea-ice biogeochemistry. We review work on the growth of mushy layers and convective flows driven by density gradients in the interstitial fluid. After introducing the fundamentals of mushy-layer theory, we discuss the effective thermal properties, including the impact of salt transport on mushy-layer growth. We present a simplified model for diffusively controlled growth of mushy layers with modest cooling versus the solutal freezing-point depression. For growth from a cold isothermal boundary, salt diffusion modifies mushy-layer growth by around 5–20% depending on the far-field temperature and salinity. We also review work on the onset, spatial localization and nonlinear development of convective flows in mushy layers, highlighting recent work on transient solidification and models of nonlinear convection with dissolved solid-free brine channels. Finally, future research opportunities are identified, motivated by geophysical observations of ice growth. This article is part of the theme issue ‘The physics and chemistry of ice: scaffolding across scales, from the viability of life to the formation of planets’.
糊状层中稳定对流和振荡对流之间的相互作用
影响因子：
3.7
作者：
GUBA P
通讯作者：
GUBA P