Transmittance through sea ice from radiation station 2019R9@en

Solar radiation over and under sea ice was measured by radiation station 2019R9, an autonomous platform, installed on drifting First-Year-Ice (FYI) in the Arctic Ocean during MOSAiC (Leg 1) 2019/20. The resulting time series describes radiation measurements as a function of place and time between 07 October 2019 and 17 June 2020 in sample intervals of 3 hours. 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 5 m long thermistor chain with sensor spacing of 0.02 m and several other sensor packages, which measured water temperature, pressure and conductivity at hourly intervals. Ecology sensors measured backscatter strength, chlorophyll a and fluorescence of dissolved organic matter at hourly intervals. Oxygen sensors measured relative oxygen air saturation, and water temperature at hourly intervals. In addition, uncompensated and compensated conductivity of water as well as relative snow height was measured at hourly intervals. All times are given in UTC.2019/2020年北极海冰多学科漂流观测计划（MOSAiC）第一航段期间，部署于北冰洋漂流一年冰（First-Year-Ice, FYI）上的自主观测平台——辐射站2019R9，完成了海冰上下方太阳辐射的原位测量。所生成的时间序列完整呈现了2019年10月7日至2020年6月17日期间，以3小时为采样间隔的辐射测量结果，该结果为空间位置与时间的函数。本次辐射测量采用光谱辐射计（spectral radiometers）完成，所有数据均保留全光谱分辨率，并经插值至1.0 nm的光谱间隔；同时还提供了全波长范围（宽带总辐射：320~950 nm）下的积分辐射数据。两台传感器（太阳辐照度与上行反射太阳辐照度）安装于海冰表面上方约1米处的观测平台；第三台传感器则安装于海冰下方0.5米处，用于测量下行透射辐照度。除辐射测量模块外，该自主观测平台还搭载了一套总长5米、传感器间距为0.02米的热敏电阻链（thermistor chain），以及多组其他传感器组件：其中，水温、压力与电导率数据按小时间隔采集；生态传感器可按小时间隔采集后向散射强度、叶绿素a（chlorophyll a）浓度与溶解性有机质荧光信号；溶氧传感器可按小时间隔采集相对氧气空气饱和度与水温数据。此外，平台还可按小时间隔采集水体未补偿电导率与补偿电导率，以及相对雪面高度数据。所有时间标注均采用协调世界时（UTC）。