Seasonal evolution of granular and columnar sea ice pore microstructure and pore network connectivity
Seasonal evolution of granular and columnar sea ice pore microstructure and pore network connectivity
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粒状和柱状海冰孔隙微结构和孔隙网络连通性的季节演化
DOI：
10.1017/jog.2022.1
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发表时间：
2022
影响因子：
3.4
通讯作者：
Eicken, Hajo
中科院分区：
文献类型：
--
作者：
Oggier, Marc;Eicken, Hajo
海冰孔隙微结构制约着冰的输运特性，影响着与冰中石油输运和海洋地球化学过程相关的流体流动。由于缺乏孔隙微结构数据，特别是颗粒冰和整个季节性周期，喉道大小，曲折度，连通性，和其他微结构变量来自X射线计算机断层扫描的盐水填充孔隙在季节性的阿拉斯加北方的固陆冰。在冰的生长，过渡和融化季节的颗粒和柱状冰的数据。虽然粒状冰比柱状冰具有更不均匀的孔隙空间，但孔隙和喉道尺寸分布是可比的。与柱状冰（1.0 < τc <1.1）相比，颗粒冰（1.2 < τg < 1.7）中孔隙的更大弯曲度与较少互连的孔隙空间相结合，这意味着对于给定的孔隙度，在生长季节期间颗粒冰的渗透率较低。微结构数据解释了在冰的生长和过渡阶段，颗粒冰阻碍冰中石油垂直输送的发现。随着颗粒冰在不断变化的北极地区越来越频繁，需要从这样的研究中获得数据，以改进孔隙度-渗透率关系的建模。
Sea-ice pore microstructure constrains ice transport properties, affecting fluid flow relevant to oil-in-ice transport and biogeochemical processes. Motivated by a lack of pore microstructural data, in particular for granular ice and across the seasonal cycle, throat size, tortuosity, connectivity, and other microstructural variables were derived from X-ray computed tomography for brine-filled pores in seasonal landfast ice off northern Alaska. Data were obtained for granular and columnar ice during the ice growth, transition, and melt season. While granular ice exhibits a more heterogeneous pore space than columnar ice, pore and throat size distributions are comparable. The greater tortuosity of pores in granular (1.2 < τg < 1.7) compared to columnar ice (1.0 < τc < 1.1) compounded with a less interconnected pore space translates into lower permeability for granular ice during the growth season for a given porosity. The microstructural data explain findings of granular ice hindering vertical oil-in-ice transport during ice growth and transition stage. With granular ice more frequent in the changing Arctic, data from studies such as this are needed to inform improved modeling of porosity-permeability relationships.
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DOI：
--
发表时间：
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期刊：
影响因子：
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作者：
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