Absorbance measurements of total particulate and non-algal particulate matter during Heincke cruise HE448 in Sognefjord and Trondheimsfjord, Norway

Data presented are absorbance (Abs) measurements of total particulate (PA) and non-algal particulate (NAP) material. NAP Abs spectra were measured using the same filters upon bleaching with 90% sodium hypochlorite solution. Water samples were collected from near-surface (4m) and subsurface (close to observed deep chlorophyll maxima (DCM) depths. Near-surface samples were collected from Ferry-Box system (4HJena, Germany) and the DCM samples were collected from a SBE 911plus CTD system (SeaBird, USA). Water samples of varying volume (0.25 - 0.75 l), depending on water turbidity, were filtered onto 47 mm, pre-combusted, 0.7 μm glass fiber filters (Whatman, GF/F) under low vacuum. Absorbance was measured following the Quantitative Filter Technique (QFT) using a spectrophotometer with integrating sphere (Cary 4000, Agilent Technologies, USA). Reference spectra were measured using wet filters (ultra pure water). Blanks provided are average of spectra measured over a day. Samples were measured in triplicates.本数据集收录总颗粒物质（PA, total particulate）与非藻类颗粒物质（NAP, non-algal particulate）的吸光度（Abs, absorbance）测定数据。非藻类颗粒物质的吸光度光谱，以经90%次氯酸钠溶液漂白后的同一张滤膜进行测定。水样采集于近表层（4米深度）及次表层（接近实测深层叶绿素最大层（DCM, deep chlorophyll maxima）的深度处）。近表层水样通过Ferry-Box系统（德国耶拿4H站）采集，深层叶绿素最大层水样则通过SBE 911plus CTD系统（美国SeaBird公司）采集。根据水体浊度调整取样体积（0.25~0.75升），经低真空过滤至直径47毫米、经预灼烧处理的0.7微米玻璃纤维滤膜（Whatman GF/F）上。吸光度测定采用定量滤膜技术（QFT, Quantitative Filter Technique），通过搭载积分球的分光光度计（美国安捷伦Cary 4000型）完成。参照光谱以浸润超纯水的湿润滤膜作为载体进行测定。本次提供的空白值为单日多次光谱测定结果的平均值。所有样品均进行三次重复测定。