Snow and firn permeability at Siple Dome, Antarctica
Snow and firn permeability at Siple Dome, Antarctica
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南极洲 Siple Dome 的雪和冷杉渗透性
DOI：
10.3189/172756400781820273
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发表时间：
2000
影响因子：
2.9
通讯作者：
F. Perron
中科院分区：
文献类型：
--
作者：
M. Albert;E. F. Shultz;F. Perron
摘要气-雪交换过程的性质既取决于雪的物理特性，也取决于大气的强迫作用。了解雪-空气输送过程和这些过程的模型对于解释冰芯和预测遥感的雪面特征很重要。准确的建模需要了解积雪和积雪的物理特性。本文介绍了南极西普尔穹顶从地表到12m深度的积雪和积雪渗透性的测量结果。渗透率随地层和深度的变化很大，一般增加到3米左右，低于3米一般下降。最大渗透率为280×10~(-10)m~2，深度约为3m。在地表风场中测得积雪顶端12m积雪的最低渗透率为10×10-10wm2。测量表明，分层和微结构对渗透率有很大影响。给出了渗透率随深度变化的数学表达式。结果表明，雪密度是反映渗透率的一个较差的指标，定量显微镜有助于将观测到的积雪特征与渗透率联系起来，并可用于模拟硬化和化学物种迁移。
Abstract The nature of air-snow exchange processes depends upon both the physical characteristics of the snow and forcing from the atmosphere. An understanding of snow-air transport processes and models of these processes are important for interpreting ice cores and for predicting remotely sensed snow-surface characteristics. Accurate modeling requires knowledge of the physical characteristics of the snow and firn. In this paper, measurements of snow and firn permeability from the surface down to 12 m depth at Siple Dome, Antarctica, are presented. The permeability varies greatly as a function of layer and depth, generally increasing to approximately 3 m, and generally decreasing below that. The maximum permeability,280 × 10–10 1 0 m2, occurs at approximately 3 m depth. The lowest permeability in the top 12 m of snow and firn, 10 × 10–10w m2, was measured in the surface wind pack/The measurements show that layering and microstructure have large effects on permeability A mathematical expression for the overall variation of permeability with depth is presented It is shown that snow density is a poor indicator of permeability Quantitative microscopy may be helpful in relating observed snow characteristics to permeability, and useful in modeling firnification and chemical-species transport.