Towards an estimation of sub-sea-ice platelet-layer volume with multi-frequency electromagnetic induction sounding
Towards an estimation of sub-sea-ice platelet-layer volume with multi-frequency electromagnetic induction sounding
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DOI：
10.3189/2015aog69a705
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发表时间：
2015
影响因子：
2.9
通讯作者：
P. Hunkeler;S. Hendricks;M. Hoppmann;S. Paul;R. Gerdes
中科院分区：
文献类型：
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作者：
P. Hunkeler;S. Hendricks;M. Hoppmann;S. Paul;R. Gerdes
摘要冰-血小板簇改变了南极冰架附近海冰的热量和质量平衡，并为冰相关生物提供了独特的栖息地。这些冰晶在固体海冰下面的数量和分布提供了对冰架空腔中的融化速率和循环状态的洞察，这是难以直接观察的。然而，人们对南极洲周围海冰下血小板层的体积知之甚少，因为观测大多仅限于点测量。在这项研究中，我们提出了一个新的应用多频电磁（EM）感应测深量化血小板层的属性。结合原位数据和理论响应，得到体片晶层电导率为1154 ± 271 mS m-1，冰体积分数为0.29-0.43。校准程序和不确定性进行了详细讨论，以方便今后的研究。我们的研究结果表明，多频电磁感应探测是一种很有前途的方法，有效地映射血小板层体积在更大的规模比以前是可行的。
Abstract Ice-platelet clusters modify the heat and mass balance of sea ice near Antarctic ice shelves and provide a unique habitat for ice-associated organisms. The amount and distribution of these ice crystals below the solid sea ice provide insight into melt rates and circulation regimes in the ice-shelf cavities, which are difficult to observe directly. However, little is known about the circum-Antarctic volume of the sub-sea-ice platelet layer, because observations have mostly been limited to point measurements. In this study, we present a new application of multi-frequency electromagnetic (EM) induction sounding to quantify platelet-layer properties. Combining in situ data with the theoretical response yields a bulk platelet-layer conductivity of 1154 ± 271 mS m–1 and ice-volume fractions of 0.29-0.43. Calibration routines and uncertainties are discussed in detail to facilitate future studies. Our results suggest that multi-frequency EM induction sounding is a promising method to efficiently map platelet-layer volume on a larger scale than has previously been feasible.