In situ sea ice temperature and relative conductivity measurements from Microstructure and In situ Salinity and Temperature buoy in Elson Lagoon, October 2017-March 2018

Two Microstructure and In situ Salinity and Temperature (MIST) buoys were deployed in Elson Lagoon in October, 2017. They each consist of two vertical sets of 32 temperature sensors colocated with pairs of exposed wires, between which the electrical impedance of the ice/water in between can be measured (see Notz, 2005). These sensor pairs are located every 3 centimeters (cm) from slightly (~3 cm) above the water line to ~87 cm below. The buoys were each additionally equipped with air temperature, Global Positioning System (GPS), and x-y tilt sensors. Each sensor is sampled every hour, at which point data was both stored locally and sent back via Iridium short burst data link. The buoys were deployed in open water at the beginning of the ice growth season so that the sea ice grows down around the sensors. The electrical impedance of the water and ice, combined with the temperature, can be used to find solid fraction and bulk salinity of the ice as it grows and evolves over the winter season. These buoys were a new design, using a sensor system that had not been run unattended in the field for long periods of time before. Several channels on the sensors stopped reporting over the course of the season, so missing measurements in this dataset are filled in with "NaN". The only vertical profile that continued making measurements throughout a full ice growth season is the left side of buoy E. This was however an abbreviated season, with the buoy having been run over by an ice floe shortly after deployment and was chipped out of the ice and righted in early December (see Sampling, Study Extent section). Notz, D., Wettlaufer, J.S. and Worster, M.G., 2005. A non-destructive method for measuring the salinity and solid fraction of growing sea ice in situ. Journal of Glaciology, 51(172), pp.159-166.两台微结构与原位盐度温度（Microstructure and In situ Salinity and Temperature, MIST）浮标于2017年10月部署于埃尔松泻湖（Elson Lagoon）。每台浮标均包含两套垂直排布的32组温度传感器，每组传感器与一对裸露导线配对安装，可测量该对导线间冰/水介质的电学阻抗（详见Notz等，2005）。这些传感器对以3厘米（cm）为间隔排布，布设范围从水位线以上约3厘米处延伸至水位线以下约87厘米处。每台浮标还额外搭载了空气温度传感器、全球定位系统（Global Positioning System, GPS）以及X-Y倾斜传感器。所有传感器均以1小时为采样周期，采集数据会同时本地存储，并通过铱星短突发数据链路回传。浮标部署于海冰生长季初期的开阔水域，以便海冰能够在传感器周围向下生长覆盖。结合温度数据与冰、水的电学阻抗，可反演冬季海冰生长与演化过程中的冰体固相占比与整体盐度。该浮标为全新设计，其搭载的传感器系统此前从未在野外长期无人值守运行过。观测季期间，部分传感器通道停止回传数据，因此本数据集内的缺失测量值以"NaN"填充。本数据集内唯一在完整海冰生长季持续获取观测数据的是E号浮标的左侧剖面，但该观测季实际为缩短版：浮标在部署后不久即被浮冰撞击，随后于12月初被从冰体中凿出并扶正（详见"采样与研究范围"章节）。参考文献：Notz, D.、Wettlaufer, J.S. 与 Worster, M.G., 2005. 一种原位无损测量生长中海冰盐度与固相占比的方法. 《冰川学期刊》（*Journal of Glaciology*）, 51(172), 第159-166页。