Sea ice draft measured by upward looking sonar at mooring site AWI230-3

Lograte: 4 min. The data identification flags (columns 6 & 8) stand for: 1=ice, 2=thin ice/open water, 0=water, empty cells=rejected/erroneous data. Depth was calculated by: (p_uls-p_atm)/(rho * g), where p_uls is the measured water pressure, p_atm is the atmospheric pressure from ECMWF (http://www.ecmwf.int) reanalysis, rho is 1027 kg/m**3, and g is the latitude-dependent acceleration of gravity.

数据记录间隔：4分钟。数据识别标记（第6列与第8列）的含义如下：1代表海冰，2代表薄冰/开阔水域，0代表水域，空单元格表示数据被剔除或存在错误。水深通过如下公式计算：(p_uls - p_atm)/(ρ·g)，其中p_uls为实测水压，p_atm为来自欧洲中期天气预报中心（ECMWF，http://www.ecmwf.int）的再分析大气压强数据，ρ为1027 kg/m³，g为随纬度变化的重力加速度。