Hyperspectraldownward sky leaving radiance observed at 45° zenith angle (Lsky) observed during RV METEOR cruise M187

Hyperspectral radiometric quantities were observed at a 5-minute sampling interval in the South Atlantic Gyre and Benguela Upwelling System during a scientific field campaign aboard research vessel (RV) Meteor. The research cruise began on January 25, 2023 from Walvis Bay, Namibia, and ended on March 01, 2023 in Walvis Bay, Namibia. A radiometer setup with one TriOS RAMSES-ACC hyperspectral cosine irradiance meter to measure incoming solar irradiance (Ed) and two TriOS RAMSES-ARC hyperspectral radiance meters to measure total upward sea surface leaving radiance (Lsfc) at 45° nadir and sky-leaving radiance (Lsky) at 45° zenith angle, was installed using a custom-made frame at the bow of RV METEOR. Data logging of raw and calibrated radiometric quantities was automated using TriOS MSDA XE version 8.9.2 software. Further processing was done using R software (R Core Team (2023)). Processed data was interpolated to 1 nm spectral resolution using linear interpolation in R between 320 and 950 nm. Quality control involved retaining the Lsfc observations with lowest values (Garaba et al., 2012; Garaba et al., 2015) and corresponding Ed and Lsky observations. Raw data is available on request.

本数据集依托“流星号”（RV Meteor）科考船开展的野外科学考察，在南大西洋环流（South Atlantic Gyre）与本格拉上升流系统（Benguela Upwelling System）海域以5分钟的采样间隔获取高光谱辐射量观测数据。本次科考航次于2023年1月25日从纳米比亚沃尔维斯湾（Walvis Bay）起航，于2023年3月1日返回该港结束航程。科考船艏部通过定制框架安装了一套辐射计观测系统：包含1台TriOS RAMSES-ACC型高光谱余弦辐照度计，用于测量入射太阳辐照度（Ed）；以及2台TriOS RAMSES-ARC型高光谱辐射亮度计，分别用于测量天顶角45°处的天空出射辐射亮度（Lsky）与天底角45°处的海面总向上出射辐射亮度（Lsfc）。原始与校准后的辐射量数据的记录工作通过TriOS MSDA XE 8.9.2版本软件实现自动化。后续数据处理工作依托R软件（R Core Team，2023）完成。处理后的数据在R环境中通过线性插值法重采样至320~950 nm波段范围内的1 nm光谱分辨率。质量控制环节参考Garaba等（2012；2015）提出的方法，保留数值最低的Lsfc观测数据及其对应的Ed与Lsky观测数据。原始数据可根据申请提供。