Transmitted irradiance through sea ice from radiation station 2020R21@en

Solar radiation over and under sea ice was measured by radiation station 2020R21, an autonomous platform, installed on a drifting melt pond in the Arctic Ocean during MOSAiC (Leg 5) 2019/20. The resulting time series describes radiation measurements as a function of place and time between 27 August 2020 and 14 November 2020 in sample intervals of 1 hour. The radiation measurements have been performed with spectral radiometers. All data are given in full spectral resolution interpolated to 1.0 nm, and integrated over the entire wavelength range (broadband, total: 320 to 950 nm). Two sensors, solar irradiance and upward reflected solar irradiance, were mounted on a on a platform about 1 m above the sea ice surface. The third sensor was mounted 0.5 m underneath the sea ice measuring the downward transmitted irradiance. Along with the radiation measurements, this autonomous platform consisted of a lightchain, which measured counts of red, green and blue light at 49 positions at hourly intervals. In addition, the evolution of snow height is measured at hourly intervals. All times are given in UTC.本数据集由自主观测平台辐射站2020R21完成观测，该平台部署于MOSAiC（第5航次）2019/20科考期间的北冰洋漂流融池中，用于采集海冰上方与下方的太阳辐射数据。所得时间序列记录了2020年8月27日至2020年11月14日期间，以1小时为采样间隔的辐射观测数据，其变量为观测位置与观测时刻。辐射观测采用光谱辐射计（spectral radiometers）完成，所有数据均以全光谱分辨率给出，并插值至1.0 nm波段间隔，同时针对全波长范围（宽带总辐射：320~950 nm）进行积分处理。两台传感器安装于海冰表面上方约1米处的平台上，分别用于观测太阳入射辐照度与向上反射太阳辐照度；第三台传感器安装于海冰下方0.5米处，用于观测向下透射辐照度。除辐射观测外，该自主平台还搭载了光链（lightchain）系统，可按1小时间隔对49个观测点位的红、绿、蓝三色光强度计数进行采集。此外，平台还按1小时间隔对雪深变化进行监测。所有时间均采用协调世界时（UTC）标注。