A glimpse beneath Antarctic sea ice: Platelet layer volume from multifrequency electromagnetic induction sounding
A glimpse beneath Antarctic sea ice: Platelet layer volume from multifrequency electromagnetic induction sounding
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DOI：
10.1002/2015gl065074
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发表时间：
2016-01
影响因子：
5.2
通讯作者：
P. Hunkeler;M. Hoppmann;Stefan Hendricks;T. Kalscheuer;R. Gerdes
中科院分区：
文献类型：
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作者：
P. Hunkeler;M. Hoppmann;Stefan Hendricks;T. Kalscheuer;R. Gerdes
在南极洲，冰晶从冰架洞穴中出现，并聚集在附近海冰下松散的层中。这些次冰片层形成了一个独特的栖息地，并作为冰架状态的指示器。然而，缺乏适当的方法阻碍了对这一现象的有效量化，超出了点的测量范围。在这项研究中，我们在韦德尔海东部100公里长的剖面上，在快速冰层上获得了多频电磁(EM)感应测深。电磁法测得的片层厚度和电导率与其他野外观测结果一致。我们的结果表明，该区域的血小板层体积比先前认为的要大，并且血小板层冰体积分数与其厚度成正比。我们得出结论，多频电磁是测定血小板层体积的合适工具，有可能获得有关冰架空洞的相关过程的关键知识。
In Antarctica, ice crystals emerge from ice shelf cavities and accumulate in unconsolidated layers beneath nearby sea ice. Such sub‐ice platelet layers form a unique habitat and serve as an indicator for the state of an ice shelf. However, the lack of a suitable methodology impedes an efficient quantification of this phenomenon on scales beyond point measurements. In this study, we inverted multifrequency electromagnetic (EM) induction soundings, obtained on fast ice with an underlying platelet layer along profiles of 100 km length in the eastern Weddell Sea. EM‐derived platelet layer thickness and conductivity are consistent with other field observations. Our results suggest that platelet layer volume is higher than previously thought in this region and that platelet layer ice volume fraction is proportional to its thickness. We conclude that multifrequency EM is a suitable tool to determine platelet layer volume, with the potential to obtain crucial knowledge of associated processes in otherwise inaccessible ice shelf cavities.