Statistical characterization of the geophysical and electrical properties of snow on Landfast first-year sea ice
Statistical characterization of the geophysical and electrical properties of snow on Landfast first-year sea ice
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Landfast 第一年海冰上雪的地球物理和电学特性的统计特征
DOI：
10.1029/94jc02200
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发表时间：
1995
影响因子：
--
通讯作者：
E. LeDrew
中科院分区：
文献类型：
--
作者：
D. Barber;S. Reddan;E. LeDrew
在这项工作中，我们量化的垂直地球物理和电气性能的积雪对陆地固定的第一年海冰观测季节性海冰监测和模拟网站（SIMMS'92）的实验。雪粒形态，密度，盐度，温度和湿度进行了测量，空气，冰，盐水的体积分数，和复杂的介电常数的雪进行了建模超过3厘米的垂直分辨率跨越季节从4月至6月。我们的研究结果表明，在垂直方向上的雪粒形态，盐度，密度和分数体积的盐水，冰，和空气协变。垂直颗粒形态的统计特征表明，在寒冷（−20°C）的大气温度下会出现两个不同的层，而在温暖（−5°C）的大气温度下会出现三个层。在整个季节期间，新雪的沉积量约为250 kg·m−3，并迅速压实至375 kg·m−3，由于变质条件不同，雪粒在积雪中的生长速度也不同。介电，雪量密切遵循的季节和垂直模式的颗粒形态，盐度，温度，密度和相比例的水在雪量。随着季节的演变，盐水体积的增加和液相中水的存在导致介电特性在几个因素（e′mix）和数量级（e″mix）上增加。
In this work we quantify the vertical geophysical and electrical properties of a snow cover on landfast first-year sea ice observed during the Seasonal Sea Ice Monitoring and Modelling Site (SIMMS'92) experiment. Snow grain morphology, density, salinity, temperature and wetness were measured; the volume fractions of air, ice, brine, and the complex dielectric constant of the snow were modeled over a 3-cm vertical resolution spanning a seasonal period from April to June. Our results show that over the vertical dimension the snow grain morphology, salinity, density, and fractional volumes of brine, ice, and air covary. The statistical characterization of the vertical grain morphology indicates that two distinct layers occurred under cold (−20°C) and three layers under warm (−5°C) atmospheric temperatures. Over the seasonal period it was shown that new snow was deposited at about 250 kg·m−3 and quickly compacted to 375 kg·m−3 Snow grains grew at different rates within the snow cover because of differing metamorphic conditions. Dielectrically, the snow volume followed closely the seasonal and vertical patterns of grain morphology, salinity, temperature, density and the phase proportions of water within the snow volume. As the season evolved, the increasing brine volumes and presence of water in liquid phase caused the dielectric properties to increase over several factors (e′mix) and orders of magnitude (e″mix).