Coastal and landfast sea ice thickness in western Ross Sea, Antarctica, from airborne electromagnetic induction in November 2017@en

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.本数据集为覆盖南极罗斯海西部（从麦克默多湾至阿代尔角）沿岸海冰与冰下血小板层（sub-ice platelet layer, SIPL）厚度分布的约800公里航空电磁测量（airborne electromagnetic survey）数据。数据采集于2017年11月8日至13日，处于该区域固定冰（fast ice）最大覆盖范围出现后的30天内。约700公里的测线覆盖了与海岸牢固附着至少15天的固定海冰，该区域海冰以一年冰为主。所有测点均提供未经过平滑处理的同相分量（in-phase component）与正交分量（quadrature component）数据。数据已通过100点中值滤波器（median filter）进行平滑处理，所有测点同样提供平滑后的同相分量与正交分量数据。在平整冰（level ice）下方可识别冰下血小板层厚度，另有Langhorne等学者提出的滤波器可用于识别平整冰。基于上述数据，可在平整冰测点处得到平整冰的同相分量、正交分量以及冰下血小板层厚度数据。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；对于存在冰下血小板层的平整冰，正交分量与冰下血小板层厚度则是估算海冰厚度的最优指标。所有数据单位均为米。