High-resolution XRF core scanning data (K/Al and Si/Ti) spanning the late MIS 6 to MIS 1 from Füramoos in Southern Germany at an average temporal resolution of ~45 years. Si/Ti is used to identify phases of increased precipition of biogenic silica (primarily diatoms). K/Al is primarily interpreted as a proxy for precipitation and utilizes two characteristics: (a) K is far more easily water soluble than Al and thus easier transported into the basin during periods of high weathering intensity, and (b) high Al is associated with increased dust transport into the basin. Thus, high K and low Al are interpreted as wet conditions, whereas low K and high Al stand fro dry periods. Our XRF-CS data indicate millennial-scale climate oscillations associated with Greenland Interstadials / Dansgaard-Oeschger Events during MIS 3 and 4 and are used to support the palynological data of the same study.
In der deutschen Metallindustrie besteht ein signifikantes Potenzial zur Verbesserung der Ressourceneffizienz durch den Einsatz neuartiger sensorgestützter Analyse- und Sortiertechnologien. Dadurch können große Mengen an Primärrohstoffen substituiert und dissipative Verluste von Legierungselementen vermieden werden. Hauptziel des Projektes war die Ermittlung von Potentialen zur Verminderung von Downcycling durch ein legierungsspezifisches Recycling von Stahl-, Aluminium-, Kupfer- und Zinklegierungen. So kann eine nachhaltige Circular Economy erreicht und zudem die Versorgungssicherheit mit Metallrohstoffen unterstützt werden.
The elemental composition of the composite sediment record from HZM19 was obtained using the ITRAX XRF Core Scanner at the GEOPOLAR lab (University of Bremen) using a Cr tube with the following settings: exposure time: 5 s, voltage: 30 kV, and current: 50 mA. The step size was set to 200 µm. Prior to measurements and due to scanning times >7 h, core sections were covered with plastic foil (Chemplex Thin-Film). The dataset was cleaned following measurements, i.e. only data points remain that pass the following conditions: 1. counts per seconds >39.000; 2. MSE <15, and 3. validity equals 1. All values are provided in counts (cts). Here only the continuous XRF records of the composite profile is documented. Ages refer to Birlo et al. (2023) and the related dataset is Model D available via doi:10.1594/PANGAEA.949292.
Hyperspectral image (HSI) scanning of the composite record from Holzmaar (HZM19) was measured using a Specim PFD-CL-65-V10 E line scan camera (University of Bern, Switzerland). Data were processed using the ENVI software following the workflow of Butz et al. (2015, doi10.1117/1.JRS.9.096031): data were white-corrected, masked for cracks in the sediment surface and Relative Absorption Band Depths (RABDs) were computed for 2mm wide subsets. RABD671 (band depths from 640 to 702 nm) for Total Chloropigments-a (TChl-a), RABD845 (790 - 900 nm) for Bacteriopheopigments-a (Bphe-a), and RABD620 (600 - 640 nm) for Phycocyanin (PhyCy). To translate HSI indices into absolute concentrations, a pigment extraction was performed at the University of Bern using 23 samples covering the full range of RABD671 and RABD845 index values. Ca 1 g of wet sediment was treated with 100 % acetone following the method of Lami et al. (1994, doi:10.1007/BF00684032) and extractions were measured using a Shimadzu UV-1800 spectrophotometer to obtain bulk concentrations of TChl-a and Bphe-a in µg/g dry sediment using a molar extinction coefficient for TChl-a and Bphe-a. A proxy-proxy calibration was carried out using an ordinary least square regression. After all, only 1.42 % and 0.77 % of datapoints are outside of the calibration ranges for Chl-a (calibration range: 12.75 – 1202.68 µg/g, intercept = -4799.52, slope= 4756,45, r² = 0.8, p-val = 0.00, RMSEP 10-fold = 169.03, RMSEP % = 14.05) and Bphe-a (calibration range 0.38 – 345.12 µg/g, intercept = -1295,8, slope= 1319,7, r² = 0.94, p-val = 0.00, RMSEP 10-fold = 25.26, RMSEP % = 7.32). Ages refer to Birlo et al. (2023) and the related dataset is Model D available via doi:10.1594/PANGAEA.949292.
