Spectral reflectance measurements of water sample from a Nodularia spumigena bloom event on Lake Bante in Wilhelmshaven, Germany

Hyperspectral reflectance was measured in a laboratory after collecting a water sample from Lake Bante in Wilhelmshaven, Germany during a Nodularia spumigena bloom event on 16 August 2021. A hyperspectral Spectral Evolution (SEV) SR-3501 spectroradiometer covering the wavelength range 280 nm to 2500 nm was operated in reflectance mode with an 8° field-of-view lens fitted. Each measurement was generated as the mean of 30 scans and white referencing was completed over a 20 × 20 cm SphereOptics Zenith Polymer® SG3120 ≈ 99 % full material PTFE diffuse standard panel. An Arrilite Plus 575 W high performance halogen lamp placed at a viewing angle of 45° was placed 0.30 m above the target water sample to provide a uniform light source in a dark calibration laboratory.

2021年8月16日，德国威廉港班特湖（Lake Bante）暴发泡沫节球藻（Nodularia spumigena）水华期间，科研人员采集湖水样本后，在实验室内对其高光谱反射率进行了测量。实验采用高光谱光谱演化（Spectral Evolution, SEV）SR-3501型光谱辐射计，其波长覆盖范围为280 nm至2500 nm，以反射模式工作并配备8°视场镜头。单次测量值为30次扫描的平均结果，白光校准通过20×20 cm的SphereOptics Zenith Polymer® SG3120型约99%全聚四氟乙烯（PTFE）漫反射标准板完成。在暗校准实验室内，将Arrilite Plus型575 W高性能卤钨灯以45°观测角放置于距待测水样0.30米处，用以提供均匀照明光源。