Semi & Hemi Data

The data collected within the Beaufort Sea used a helicopter-borne electromagnetic system called the Ice Pic. This system measures sea ice thickness without the ice observer having to exit the helicopter. The system operates by using low-frequency electromagnetic waves which pass through sea ice and reflect from the ice-sea boundary. The strength of the reflections are then compared to the distance from the sensor to the top of the snow/ice. This yields an accurate estimate of sea ice thickness.

Within this resource you will find zipped data set files corresponding to the year that the data was collected along with the metadata describing each data set. Also included are pictures taken in the field showing the Ice Pic system as well as various ice floes. The user manuals for the Hemi and Semi systems are made available as well.

本次采集自波弗特海（Beaufort Sea）的数据集，采用了一款名为Ice Pic的直升机搭载式电磁探测系统。该系统可在冰面观测人员无需离开直升机的前提下，完成海冰厚度的测量。其工作原理为：利用低频电磁波穿透海冰，并在冰-海界面处发生反射；随后将反射波强度与传感器至雪/冰表层的距离进行比对，即可精准估算出海冰厚度。

本数据集资源包含与数据采集年份对应的压缩数据包文件，以及用于描述各数据集的元数据（metadata）。此外还包含野外拍摄的Ice Pic系统实拍影像，以及各类浮冰（ice floes）的照片。本次资源同时提供了Hemi与Semi两款系统的用户手册。