Coastal and landfast sea ice thickness in western Ross Sea, Antarctica, from airborne electromagnetic induction in November 2017: Victoria Land, from McMurdo Sound to Cape Adare

The data are approximately 800 km of airborne electromagnetic survey of coastal sea ice and sub-ice platelet layer (SIPL) thickness distributions in the western Ross Sea, Antarctica, from McMurdo Sound to Cape Adare. Data were collected between 8 and 13 November 2017, within 30 days of the maximum fast ice extent in this region. Approximately 700 km of the transect was over landfast sea ice that had been mechanically attached to the coast for at least 15 days. Most of the ice was first-year sea ice. Unsmoothed in-phase and quadrature components are presented at all locations. Data have been smoothed with an 100 point median filter, and in-phase and quadrature smoothed data are also presented at all locations. Beneath level ice it is possible to identify the thickness of an SIPL and a filter is described (Langhorne et al) to identify level ice. Level ice in-phase, quadrature and SIPL thickness, derived from these, are presented at locations of level ice. For rough ice, the in-phase component is considered the best measure of sea ice thickness. For level ice where there is the possibility of an SIPL, then the quadrature component is considered the best measure of ice thickness, along with SIPL thickness. All data are in meters.

本数据集为南极罗斯海西部（麦克默多湾至阿德雷角）沿岸海冰及冰下血小板层（sub-ice platelet layer, SIPL）厚度分布的航空电磁测量数据，总测线长度约800千米。数据采集于2017年11月8日至13日，处于该区域固定冰最大覆盖范围出现后的30天内。其中约700千米测线覆盖了至少与海岸固连15天以上的固定海冰，且绝大多数海冰为一年冰。所有测点均提供了未经过平滑处理的同相分量与正交分量数据。数据已通过100点中值滤波器进行平滑处理，所有测点同样提供了平滑后的同相分量与正交分量数据。在平整冰下方可识别SIPL厚度，已有研究（Langhorne等）描述了一种用于识别平整冰的滤波器。基于上述数据计算得到的平整冰同相分量、正交分量及SIPL厚度数据，仅在平整冰测点处提供。对于粗糙海冰，同相分量被认为是估算海冰厚度的最优指标；对于存在SIPL的平整海冰，正交分量与SIPL厚度则是估算海冰厚度的最优指标。所有数据单位均为米。