Color Reflectance (Spectrophotometer) of IODP Hole 389-M0097D@en

Color reflectance spectrophotometry and colorimetry data from the above given hole of International Ocean Discovery Program (IODP) Expedition 389 (Hawaiian Drowned Reefs). The data where obtained during the onshore phase of expedition 389 which took place between 2025-02-06 to 2025-02-26 at the Bremen Core Repository (BCR) hosted at MARUM – Center for Marine Environmental Sciences, University of Bremen. After longitudinal splitting of the core sections, each archive half was scanned by a handheld Konica Minolta spectrophotometer (Model CM-2600d), recording data at approximately 2-cm sampling interval. Interval spacing was adjusted appropriately depending on the nature of the core (i.e., the presence of rubble, vugs, and fractures) and commented on in the data report. Measurements were taken in the most visibly homogeneous areas at each depth downcore to obtain as pure a color reflectance signal as possible. The obtained data is represented in the L*a*b* color coordinate system, where L* is a total reflectance index ranging 0%–100%, a* is green (<0) to red (>0) chromaticity, and b* is blue (<0) to yellow (>0) chromaticity. Furthermore, the analyses give Munsell color values , and intensity values for 31 contiguous 10 nm wide bands across the 360–740 nm interval of the light spectrum with a reflectance range of 0%–175% and a resolution of 0.01%. […]本数据集包含国际大洋发现计划（International Ocean Discovery Program, IODP）389航次（夏威夷沉没礁）指定钻孔的颜色反射分光光度法与色度学数据。数据采集于2025年2月6日至2025年2月26日期间开展的389航次陆上处理阶段，采集地点为不来梅大学海洋环境科学中心（MARUM – Center for Marine Environmental Sciences）托管的不来梅岩芯库（Bremen Core Repository, BCR）。岩芯剖面经纵向劈开后，采用手持柯尼卡美能达分光光度计（型号CM-2600d）对每一块存档半芯进行扫描，采样间隔约为2厘米。采样间隔会根据岩芯特性（如碎砾、溶蚀孔洞与裂隙的存在情况）进行适当调整，并已在数据报告中备注说明。测量点位选取岩芯各深度层肉眼可见最均一的区域，以尽可能获取纯净的颜色反射信号。所得数据采用L*a*b*颜色坐标系表示：其中L*为总反射率指数，取值范围为0%~100%；a*代表绿（<0）至红（>0）的色度轴；b*代表蓝（<0）至黄（>0）的色度轴。此外，本分析还给出了孟塞尔颜色值（Munsell color values），以及光谱360~740 nm区间内31个连续10 nm带宽波段的强度值，其反射率范围为0%~175%，分辨率达0.01%。[...]