Particulate light absorption coefficients (350 – 750 nm) measured using the filter pad method during the Antarctic Circumnavigation Expedition (ACE) during the austral summer of 2016/2017.

<strong>Dataset abstract</strong> This dataset contains filter pad method measurements of particulate light absorption by particles sampled during the Antarctic Circumnavigation Expedition (ACE) Leg 1-3. Water samples were collected from the underway seawater supply every 3 hours and at multiple depths from selected CTD (conductivity, temperature and depth) rosette deployments. Seawater samples were filtered onto glass fibre filters, preserved and optical density measured using a spectrophotometer. Absorption coefficients for particulate matter were calculated from optical density measurements. The dataset also contains a small set of measurements of absorption by non-pigmented particles (non-algal particulates) measured after a methanol bleaching protocol. These measurements contribute to the determination of the inherent optical properties of the waters sampled during ACE, specifically the absorption of UV and visible wavelengths by particulate material. <strong>Dataset contents</strong> README.txt, metadata, text data_file_header.txt, metadata, text ace_UW_particulate_absorption_metadata_20200819CMRRSGCUR.csv, metadata, comma-separated values ace_UW_particulate_absorption_20200612CMRRSGCUR.csv, data file, comma-separated values ace_CTD_particulate_absorption_metadata_20200819CMRRSGCUR.csv, metadata, comma-separated values ace_CTD_particulate_absorption_20200819CMRRSGCUR.csv, data file, comma-separated values ace_UW_nonalgal_30m_absorption_20200612CMRRSGCUR.csv, data file, comma-separated values ace_UW_nonalgal_90m_absorption_20200612CMRRSGCUR.csv, data file, comma-separated values ace_UW_nonalgal_24h_absorption_20200612CMRRSGCUR.csv, data file, comma-separated values ace_UW_depig_24h_absorption_20200612CMRRSGCUR.csv, data file, comma-separated values ace_UW_depig_30m_absorption_20200612CMRRSGCUR.csv, data file, comma-separated values ace_UW_depig_90m_absorption_20200612CMRRSGCUR.csv, data file, comma-separated values**数据集摘要** 本数据集包含南极环航探险队（Antarctic Circumnavigation Expedition, ACE）第1-3航段采集的颗粒物光吸收滤膜法测量数据。研究人员每3小时从走航式海水供应系统采集表层海水样品，同时在选定的温盐深（CTD，conductivity, temperature and depth）采水架部署作业中，从多个预设深度采集分层海水样品。将采集的海水样品过滤至玻璃纤维滤膜上，经妥善保存后，使用分光光度计测定其光密度值。基于光密度测定结果，可计算得到颗粒物的光谱吸收系数。本数据集还包含经甲醇脱色处理方案测定的非色素颗粒物（non-algal particulates，非藻类颗粒物）吸收数据子集。上述测量数据可为解析南极环航探险队航次采集水样的固有光学特性提供关键支撑，尤其是颗粒物对紫外及可见光波段的吸收特性。 **数据集内容** README.txt：元数据，文本文件；data_file_header.txt：元数据，文本文件； ace_UW_particulate_absorption_metadata_20200819CMRRSGCUR.csv：元数据，逗号分隔值文件； ace_UW_particulate_absorption_20200612CMRRSGCUR.csv：数据文件，逗号分隔值文件； ace_CTD_particulate_absorption_metadata_20200819CMRRSGCUR.csv：元数据，逗号分隔值文件； ace_CTD_particulate_absorption_20200819CMRRSGCUR.csv：数据文件，逗号分隔值文件； ace_UW_nonalgal_30m_absorption_20200612CMRRSGCUR.csv：数据文件，逗号分隔值文件； ace_UW_nonalgal_90m_absorption_20200612CMRRSGCUR.csv：数据文件，逗号分隔值文件； ace_UW_nonalgal_24h_absorption_20200612CMRRSGCUR.csv：数据文件，逗号分隔值文件； ace_UW_depig_24h_absorption_20200612CMRRSGCUR.csv：数据文件，逗号分隔值文件； ace_UW_depig_30m_absorption_20200612CMRRSGCUR.csv：数据文件，逗号分隔值文件； ace_UW_depig_90m_absorption_20200612CMRRSGCUR.csv：数据文件，逗号分隔值文件。