A glimpse beneath Antarctic sea ice: Platelet layer volume from multifrequency electromagnetic induction sounding
2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 1, 222-231 p.Article in journal (Refereed) Published
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 multi-frequency electromagnetic (EM) induction soundings of > 100 km length, obtained on fast ice with an underlying platelet layer in the eastern Weddell Sea. EM-derived platelet-layer thickness and conductivity are consistent with other field observations. Our results further 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 multi-frequency 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.
Place, publisher, year, edition, pages
2016. Vol. 43, no 1, 222-231 p.
Research subject Geophysics with specialization in Solid Earth Physics
IdentifiersURN: urn:nbn:se:uu:diva-270273DOI: 10.1002/2015GL065074ISI: 000369014100027OAI: oai:DiVA.org:uu-270273DiVA: diva2:889246
FunderSwedish National Infrastructure for Computing (SNIC), snic2014-1-243German Research Foundation (DFG), SPP1158German Research Foundation (DFG), NI 1092/2German Research Foundation (DFG), HE2740/12