Spectral albedo measurements of the sea ice surface during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) campaign in the Central Arctic Ocean, April – September 2020

This dataset contains spectral albedo data recorded on the sea ice surface June-September, 2020, during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition expedition in the Central Arctic Ocean. Measurements were made in three modes: (i) along ‘albedo lines’, between 60-200 meters (m) in length, with measurements every 5 meters, (ii) at specific ‘library sites,’ or (iii) ‘experiments’. Albedo lines were chosen with the aim of crossing representative surface conditions during the summer sea ice evolution, including snow-covered ridges, bare ice, and ponded ice. Included in the dataset are classification of the surface cover and depth for most measurements. Spectral albedo data was collected using an Analytical Spectral Devices (ASD) FieldSpec Pro spectroradio meter with a custom spectralon cosine collector. Incident and reflected values were recorded subsequently, with 10 scans averaged for each.Processing of the data includes calculating an albedo from the relative values of incident and reflected scans, and completing quality control to (i) correct for parabolic offset between sensors, (ii) add flag quantifying variability of incident light that may be used to filter scans, (iii) remove scans with physically unrealistic values or slopes, and (iv) remove and filter noisy parts of the spectrum. This dataset is collocated with the broadband albedo dataset (doi.org/10.18739/A2KK94D36) and albedo photo dataset (doi.org/10.18739/A2B27PS3N).

本数据集包含2020年6月至9月期间，在北冰洋中部开展的北极气候研究多学科漂流观测站（Multidisciplinary drifting Observatory for the Study of Arctic Climate，MOSAiC）考察期间记录的海冰表面光谱反照率（spectral albedo）数据。观测采用三种模式：（i）沿“反照率线（albedo lines）”进行，线长60-200米（m），每5米测量一次；（ii）在特定“库点（library sites）”进行；（iii）通过“实验（experiments）”进行。反照率线的选取旨在覆盖夏季海冰演化过程中的典型表面状况，包括积雪冰脊、裸冰和融池冰。数据集中包含大多数测量点的表面覆盖类型及深度信息。光谱反照率数据通过Analytical Spectral Devices（ASD）公司的FieldSpec Pro光谱辐射计（spectroradiometer）采集，该仪器配备定制化Spectralon余弦收集器（cosine collector）。入射光和反射光值被依次记录，每次测量取10次扫描的平均值。数据处理包括：根据入射光和反射光扫描的相对值计算反照率；以及执行质量控制，具体包括（i）校正传感器间的抛物线偏移；（ii）添加标记以量化入射光的变异性（该标记可用于筛选扫描数据）；（iii）移除具有物理上不切实际值或斜率的扫描数据；（iv）移除并过滤光谱中的噪声部分。本数据集与宽带反照率数据集（broadband albedo dataset，doi.org/10.18739/A2KK94D36）及反照率照片数据集（albedo photo dataset，doi.org/10.18739/A2B27PS3N）相关联。