Rahman, Abdur; Wang, Liang-Chi; Kashima, Kaoru; Li, Hong-Chun; Chen, Huei-Fen; Yang, Tien-Nan (2025): Total organic carbon and total nitrogen from DH-7B sediment core from the Dahu Lake, Ilan Plain [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.982475, In: Rahman, A et al. (2025): Typhoon and climate history of northeastern Taiwan during mid to late Holocene: inferred through the Dahu Lake sediment core, Ilan Plain [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.982469
Always quote citation above when using data! You can download the citation in several formats below.
Published: 2025-05-16 • DOI registered: 2025-06-14
Abstract:
A 35-meter-long sediment core (DH-7B) was retrieved from Dahu Lake using a stainless-steel pipe mounted on a floating platform. The core was subsampled at 5-cm intervals with 1-cm thickness for diatom, stable isotope, and trace element analyses. For the analysis of carbon isotopic composition in organic carbon (δ¹³C), powdered samples were decarbonated overnight with HCl. After complete removal of inorganic carbon, the residues were washed with ultrapure water (Milli-Q) by centrifugation three to four times, then dried at 60 °C overnight. The dried samples were encapsulated in tin and combusted at 1000 °C in a Flash 2000 Elemental Analyzer (Thermo Scientific). The resulting CO₂ was analyzed by isotope ratio mass spectrometry (IRMS; Delta V Advantage, Thermo Scientific) via a ConFlo interface using He as the carrier gas. The ¹³C/¹²C ratios were reported in δ notation relative to the Vienna Pee Dee Belemnite (VPDB) standard. The USGS 40 standard (L-glutamic acid, δ¹³C = −26.39 ± 0.04‰; C content = 40.8%) was used to monitor instrument performance. Analytical precision was ±0.1‰ for δ¹³C and <10% for C content. Total nitrogen (N) content was measured simultaneously using the jump method in the same run.
Coverage:
Latitude: 24.739200 * Longitude: 121.689300
Date/Time Start: 2008-01-01T14:00:00 * Date/Time End: 2008-01-01T14:00:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 34.57 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Wang, Liang-Chi | Geocode | |
| 2 | Calendar age | Cal age | ka BP | Wang, Liang-Chi | ||
| 3 | Carbon, organic, total | TOC | % | Wang, Liang-Chi | Elemental Analyzer, Thermo Scientific, Flash 2000 | |
| 4 | Nitrogen, total | TN | % | Wang, Liang-Chi | Elemental Analyzer, Thermo Scientific, Flash 2000 | |
| 5 | Carbon, organic, total/Nitrogen, total ratio | TOC/TN | Wang, Liang-Chi | Elemental Analyzer, Thermo Scientific, Flash 2000 | ||
| 6 | δ13C, organic carbon | δ13C Corg | ‰ PDB | Wang, Liang-Chi | Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Advantage [Conflo interface] | vs. VPDB |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1766 data points