Birlo, Stella; Wienhues, Giulia; Zahajská, Petra; Grosjean, Martin; García, María Luján; Zolitschka, Bernd (2024): Elemental pigment (hyperspectral imaging) data of the varved sediment record (HZM19) from Holzmaar, Germany [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.965927
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Published: 2024-11-14 • DOI registered: 2024-12-13
Abstract:
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.
Supplement to:
García, María Luján; Birlo, Stella; Zahajská, Petra; Wienhues, Giulia; Grosjean, Martin; Zolitschka, Bernd (2024): Ecological responses to solar forcing during the Homerian Climate Anomaly recorded by varved sediments from Holzmaar, Germany. The Holocene, 09596836241275008, https://doi.org/10.1177/09596836241275008
Coverage:
Latitude: 50.116670 * Longitude: 6.883333
Date/Time Start: 2019-08-11T00:00:00 * Date/Time End: 2019-08-17T00:00:00
Minimum Elevation: 425.0 m * Maximum Elevation: 425.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Core section label | Sec label | Birlo, Stella | |||
| 2 | Section position | Sect | mm | Birlo, Stella | ||
| 3 | Depth, composite | Depth comp | mcd | Birlo, Stella | ||
| 4 | Calendar age, mean | Cal age mean | ka BP | Birlo, Stella | Calculated, based on VT22 (Birlo et al., 2023) | Model D |
| 5 | Calendar age, minimum/young | Cal age min | ka BP | Birlo, Stella | Calculated, based on VT22 (Birlo et al., 2023) | Model D |
| 6 | Calendar age, maximum/old | Cal age max | ka BP | Birlo, Stella | Calculated, based on VT22 (Birlo et al., 2023) | Model D |
| 7 | Relative absorption band depth, 620 nm | RABD620 | Birlo, Stella | Measured | ||
| 8 | Relative absorption band depth, 671 nm | RABD671 | Birlo, Stella | Measured | ||
| 9 | Relative absorption band depth, 845 nm | RABD845 | Birlo, Stella | Measured | ||
| 10 | Chloropigments, per unit sediment mass | Chloropigm/sed | µg/g | Birlo, Stella | HSI index, calibrated | Total |
| 11 | Bacteriopheopigments, per unit sediment mass | Bacteriopheopig/sed | µg/g | Birlo, Stella |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1415832 data points
Download Data
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