Absorbance band depth at 660 nm (RABD660) data derived from shipboard visible light reflectance spectroscopy, IODP Site 363-U1483@en

Reflectance spectroscopy of the archive section halves of sediment cores was measured during IODP Expedition 363 using an Ocean Optics USB4000 spectrophotometer on the Section Half Multisensory Logger. Measurements were taken at 2.5 cm spacing and reflectance values for visible wavelengths were recorded in 2 nm wide spectral bins between 380 and 900 nm. We use these in-situ visible light reflectance spectroscopy data to analyse the abundance of diagenetic photosynthesis pigments (chlorins) in bulk sediments along the composite sediment splice from Holes U1483A, U1483B and U1483C. The ratio of pigment fraction expressed in the relative absorption at the 660 nm spectral band is related to chlorin concentration. The relative absorption band depth at 660 nm was calculated using the algorithm: […]本研究针对沉积物岩心归档半段的反射光谱，于国际大洋发现计划（International Ocean Discovery Program, IODP）第363次航次中，借助搭载于岩心半段多感官记录仪（Section Half Multisensory Logger）的Ocean Optics USB4000型分光光度计完成测量。测量采样间距为2.5厘米，可见光波段的反射率值以380至900纳米范围内、带宽2纳米的光谱通道进行记录。本研究利用这套原位可见光反射光谱数据，对U1483A、U1483B及U1483C三个钻孔的复合沉积物拼接序列中，全岩沉积物内成岩光合色素（氯代叶绿素类，chlorins）的丰度开展分析。以660纳米光谱波段的相对吸收值表征的色素占比，与氯代叶绿素类的浓度呈相关关系。660纳米处的相对吸收带深度通过下述算法计算得出：[…]