Reflected irradiance at the sea surface from radiation station 2020R12@en

Solar radiation over and under sea ice was measured by radiation station 2020R12, an autonomous platform, installed on drifting Second-Year-Ice (SYI) in the Arctic Ocean during MOSAiC (Leg 3) 2019/20. The resulting time series describes radiation measurements as a function of place and time between 24 April 2020 and 07 August 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.2019/2020年MOSAiC科考航次第三航段期间，部署于北冰洋漂流二年冰（Second-Year-Ice, SYI）上的自主观测平台辐射站2020R12，对海冰上下方的太阳辐射开展了测量。所生成的时序数据集记录了2020年4月24日至2020年8月7日期间，随空间位置与时间变化的辐射观测数据，采样间隔为1小时。本次辐射观测采用光谱辐射计完成，所有数据均以全光谱分辨率输出，已插值至1.0 nm的波长间隔，并在全波长范围内（宽带总辐射：320~950 nm）完成积分。平台共搭载三台传感器：两台分别安装于海冰表面上方约1米处，用于测量太阳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，用于测量向下透射辐照度。除辐射观测系统外，该自主平台还集成了光链（lightchain）系统，可在49个监测位置以1小时间隔采集红、绿、蓝三色光的计数数据。此外，平台还以1小时间隔监测雪层高度的变化过程。所有时间数据均采用协调世界时（UTC）标注。