Small-Scale variability of physical properties and structural characteristics of Antarctic fast ice
Small-Scale variability of physical properties and structural characteristics of Antarctic fast ice
复制标题
南极固定冰物理性质和结构特征的小规模变化
作者：
A.L. Veazey;M. Jeffries;K. Morris
对1991 ~ 1992年南极夏季在南极麦克默多海峡（MCM）和松岛湾（PIB）获得的多对冰心的物理性质和结构特征的小尺度变化进行了研究和讨论。MCM现场的冰比PIB现场的冰厚，并被稍微薄一些的积雪覆盖。虽然这两个地点的冰的平均盐度和温度是相似的，小规模的变化，盐度和温度都在PIB大于MCM。MCM的冰盖是一个双层介质，由覆盖在片状冰上的冰屑组成。然而，来自PIB现场的冰主要由冰和冰层组成，偶尔在核心表面有薄的雪冰层。MCM岩心的晶体子结构测量、c轴方向和盐水层间距显示，南极坚冰具有适度排列的水平c轴，这表明，远离Hut Point半岛西南端的东西向洋流控制了晶体生长方向。
The small-scale variability of physical properties and structural characteristics of multiple pairs of fast-ice cores obtained during the austral summer of 1991-92 at two Antarctic sites, McMurdo Sound (MCM) and Pine Island Bay (PIB), are examined and discussed with respect to the growth and decay of the sea ice. The ice at the MCM site was thicker than that at the PIB site and was covered by a somewhat thinner snowpack. While mean salinity and temperature of the ice at the two sites were similar, small-scale variations in both salinity and temperature were greater at PIB than at MCM. The ice sheet at MCM was a two-layer medium consisting of congelation ice overlying platelet ice. The ice from the PIB site, however, was composed of mainly frazil ice and layers of congelation ice with occasional thin layers of snow-ice at the surface of the cores. Crystal sub-structure measurements, c-axis orientation and brine-layer spacing from the MCM cores revealed that the congelation ice had moderately aligned, horizontally oriented c axes, suggesting that east-west currents off the southwest tip of Hut Point Peninsula control crystal-growth orientation.d others: Variability of physical and structural characteristics of Antarctic fast ice