Elemental pigment (hyperspectral imaging) data of the varved sediment record (HZM19) from Holzmaar, Germany
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2024
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| author | Birlo, Stella Wienhues, Giulia Zahajská, Petra Grosjean, Martin García, María Luján Zolitschka, Bernd |
| author_facet | Birlo, Stella Wienhues, Giulia Zahajská, Petra Grosjean, Martin García, María Luján Zolitschka, Bernd |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_965927 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
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| spellingShingle | Elemental pigment (hyperspectral imaging) data of the varved sediment record (HZM19) from Holzmaar, Germany Birlo, Stella Wienhues, Giulia Zahajská, Petra Grosjean, Martin García, María Luján Zolitschka, Bernd Bacteriopheopigments, per unit sediment mass; Calculated, based on VT22 (Birlo et al., 2023); Calendar age, maximum/old; Calendar age, mean; Calendar age, minimum/young; Chloropigments, per unit sediment mass; Core section label; Depth, composite; Eifel; Holzmaar; Holzmaar, West-Eifel Volcanic Field, Germany; HSI; HSI index, calibrated; HZM19; Measured; PCUWI; Pigments; Piston corer, UWITEC; Relative absorption band depth, 620 nm; Relative absorption band depth, 671 nm; Relative absorption band depth, 845 nm; Section position; XRF 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. |
| title | Elemental pigment (hyperspectral imaging) data of the varved sediment record (HZM19) from Holzmaar, Germany |
| topic | Bacteriopheopigments, per unit sediment mass; Calculated, based on VT22 (Birlo et al., 2023); Calendar age, maximum/old; Calendar age, mean; Calendar age, minimum/young; Chloropigments, per unit sediment mass; Core section label; Depth, composite; Eifel; Holzmaar; Holzmaar, West-Eifel Volcanic Field, Germany; HSI; HSI index, calibrated; HZM19; Measured; PCUWI; Pigments; Piston corer, UWITEC; Relative absorption band depth, 620 nm; Relative absorption band depth, 671 nm; Relative absorption band depth, 845 nm; Section position; XRF |
| url | https://doi.org/10.1594/PANGAEA.965927 |