Late spring 2021 land-fast sea ice and sub-ice platelet layer thicknesses from electromagnetic induction soundings on transect TNB-2021_NS-CIT_EM in Gerlache Inlet, Terra Nova Bay, Antarctica@en

Ground-based electromagnetic induction (EM) measurements of land-fast sea ice and sub-ice platelet layer (SIPL) thickness distributions were carried out on land-fast sea ice in Gerlache Inlet, Terra Nova Bay, Antarctica in late spring (November 3-7) of 2021. EM transects were carried out across Gerlache Inlet in north to south and east to west directions. The EM data were acquired using a frequency-domain Geonics Ltd EM31-MK2 instrument mounted on a sledge and towed by skidoo. The thicknesses of consolidated ice (sea ice plus the snow layer) and the SIPL were simultaneously retrieved from the EM31 measured response using the forward modelling and inversion methods of Irvin (2018).2021年晚春（11月3日至7日），研究团队于南极洲特拉诺瓦湾（Terra Nova Bay）盖尔拉什湾（Gerlache Inlet）的固定冰（land-fast sea ice）上，开展了针对固定冰与冰下血小板层（sub-ice platelet layer, SIPL）厚度分布的地面电磁感应（electromagnetic induction, EM）测量工作。研究团队沿盖尔拉什湾布设了南北向与东西向的EM测线。本次EM数据通过安装于雪橇、由雪地摩托牵引的频域型盖尼克斯有限公司（Geonics Ltd）EM31-MK2仪器采集获取。研究人员借助Irvin（2018）提出的正演模拟与反演方法，从EM31的实测响应数据中同步反演得到了固结冰（海冰与积雪层之和）以及SIPL的厚度。