EcoFOCI hourly-averaged Ice Draft Data and statistics at Icy Cape, Alaska station C2; 10/2017 to 08/2018 (3 parts/phases), and 08/2018 to 08/2019 (2 parts/phases), Arctic Integrated Ecosystem Research Program, 2017-2019.

Ice draft time series data were collected at NOAA/PMEL/EcoFOCI mooring station C2 on the 3-station Icy Cape line in the Chukchi Sea at 71.23 N latitude and 164.22 W longitude and 43 meters depth. Two data sets were collected using an upward-looking sonar IPS5 instrument (ASL Environmental Sciences) mounted near-bottom at an operating frequency of 420 kHz with a beam width of 1.8 degrees. Data records extend from October 1, 2017 to August 13, 2018, and August 15, 2018 to August 14, 2019. The first mooring was deployed from R/V Ocean Starr (OS1701, leg 1). Related CTD calibration cast c005 was processed by EcoFOCI. USCGC Healy (he1801) recovered and redeployed the mooring. Related CTD cast 033 was processed by R.Pickard group, WHOI. The second mooring was recovered by R/V Ocean Starr (OS1901, leg 1). Related CTD calibration casts 021, 022 & 032 were processed by the EcoFOCI group. Range data from sonar pings to the sea ice undersurface were collected every second, and on-board, near-bottom temperature and pressure data were collected every 2 minutes. These were converted and processed into ice draft values using Matlab-based proprietary software from ASL Environmental. Ice draft data were averaged to hourly statistics. Data files contain these columns: date, mean, median, minimum, maximum and standard deviation values. Files are readable comma-separated text.

冰吃水时间序列数据采集于楚科奇海三站冰角测线的NOAA/PMEL/EcoFOCI锚系站C2，观测点位为北纬71.23°、西经164.22°，水深43米。本数据集包含两套由向上观测声呐IPS5（ASL环境科学公司，ASL Environmental Sciences）采集的数据，该仪器安装于近底位置，工作频率为420千赫，波束宽度1.8度。数据记录时段涵盖两段：2017年10月1日至2018年8月13日，以及2018年8月15日至2019年8月14日。第一套锚系装置由"海洋之星号"科研考察船（R/V Ocean Starr，航次OS1701，第一航段）布放，相关温盐深（Conductivity-Temperature-Depth, CTD）校准测站c005由EcoFOCI团队处理。美国海岸警卫队"希利号"破冰船（USCGC Healy，航次he1801）回收并重新布放了该锚系装置，相关CTD测站033由伍兹霍尔海洋研究所（Woods Hole Oceanographic Institution, WHOI）的R.Pickard团队处理。第二套锚系装置由"海洋之星号"科研考察船（R/V Ocean Starr，航次OS1901，第一航段）回收，相关CTD校准测站021、022与032由EcoFOCI团队处理。声呐脉冲至海冰下表面的距离数据以每秒1次的频率采集，船载近底温度与压力数据则每2分钟采集一次。上述数据通过ASL环境科学公司基于Matlab的专有软件转换并处理为冰吃水数值。冰吃水数据被汇总为逐小时统计量。数据文件包含以下字段：日期、平均值、中位数、最小值、最大值以及标准差。所有文件均为可读的逗号分隔文本格式。