Colour reflectance measurements on sediment core PS72/396-5

• Main Authors: Matthiessen, Jens, Stein, Ruediger
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: Arctic Ocean; ARK-XXIII/3; AWI_Paleo; Color; a*; b*; L*; lightness; X; Y; Z; Color code HLS-system; Color reflectance at 400 nm; Color reflectance at 410 nm; Color reflectance at 420 nm; Color reflectance at 430 nm; Color reflectance at 440 nm; Color reflectance at 450 nm; Color reflectance at 460 nm; Color reflectance at 470 nm; Color reflectance at 480 nm; Color reflectance at 490 nm; Color reflectance at 500 nm; Color reflectance at 510 nm; Color reflectance at 520 nm; Color reflectance at 530 nm; Color reflectance at 540 nm; Color reflectance at 550 nm; Color reflectance at 560 nm; Color reflectance at 570 nm; Color reflectance at 580 nm; Color reflectance at 590 nm; Color reflectance at 600 nm; Color reflectance at 610 nm; Color reflectance at 620 nm; Color reflectance at 630 nm; Color reflectance at 640 nm; Color reflectance at 650 nm; Color reflectance at 660 nm; Color reflectance at 670 nm; Color reflectance at 680 nm; Color reflectance at 690 nm; Color reflectance at 700 nm; DEPTH; sediment/rock
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.942229; https://doi.org/10.1594/PANGAEA.942229

This data set comprises colour reflectance measurements conducted with a hand-held spectrophotometer (Minolta CM 2002, lens diameter 8mm, field of view 0.8 cm2) at wave lengths from 400 to 700 nm, connected to a Macintosh Powerbook 5300C. Output files are the L*a*b* colour space that is also referred to as CIELAB space (Commission Internationale de l'Éclairage L*a*b colour space 1976), the chroma, hue and value of the Munsell Colour Chart (http://www.munsell.com), the percentage value of the spectrum at 10 nm steps from 400 to 700nm, and the colour values x,y and z that are defined according to the RGB colour space (CIE 1931). Lightness L* (grey scale) is recorded from 0 % (black) to 100% (white), the red-green colour space a* from -4 (green) to 16 (red), and the yellow-blue colour space b* from 0 (blue) to 40 (yellow). The spectral reflectance was measured at cm intervals on freshly split core surfaces that were covered with transparent foil. Every core section was measured separately, and a white calibration first without and then with foil was conducted before and after each core section to identify a possible drift of the spectrophotometer measurements. The raw spectral photometer data were edited by removing obvious outliers e.g. unrealistic values due to uneven core surfaces and erroneous measurements.