Lin, Tsai-Wen; Nehrke, Gernot; Grotheer, Hendrik; Koch, Boris P; Mollenhauer, Gesine (2025): Radiocarbon and thermogravimetric analysis (TGA) results of permafrost leachate from the Lena Delta, Arctic [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.984752, In: Lin, Tsai-Wen; Nehrke, Gernot; Mollenhauer, Gesine (2025): Bulk organic matter data of Lena Delta permafrost, marine surface sediment, and sediment cores from the Laptev Sea, Arctic Ocean [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.984732
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Published: 2025-09-09 • DOI registered: 2025-10-08
Abstract:
This datasheet includes radiocarbon and thermogravimetric analysis (TGA) results of permafrost leachate from samples collected in the Lena Delta. The leaching protocol followed Ksionzek et al. (2018). Around 200 mg of dried sediment was leached in 20 mL deionized water for 24 hours at 4 °C, with intermittent shaking every 6−8 hours. The leachates were filtered through 0.7 μm GF/F filters, acidified to pH 2 using 37% HCl, and analyzed by high-temperature catalytic combustion (Shimadzu, TOC-VCPN). Pretreatment and measurement of radiocarbon analysis followed protocols in Mollenhauer et al. (2021). Freeze-dried leachates were wrapped into silver boats and converted into graphite targets using Elementar vario Isotope coupled to Ionplus AG, AGE-3. Radiocarbon isotopic ratios were measured using MICADAS at AWI, Bremerhaven. For TGA analysis, leachate samples of ~10 mg were analyzed in 70 μL aluminum oxide crucibles using a Mettler Toledo TGA/DSC 1. The samples were heated from 25 to 1000 °C at a rate of 10 °C min-1 under a constant argon flow of 20 mL min-1, following similar settings from Smeaton & Austin (2022). Following Lopez-Capel et al. (2006), weight loss between 200–400 °C is attributed to the decomposition of labile organic matter (OML), while weight loss between 400–650°C corresponds to the decomposition of recalcitrant and refractory organic matter (OMR). The percentage of labile organic matter (OML/OM) is calculated as [OML/(OML+OMR)]*100%
Keyword(s):
References:
Capel, Elisa Lopez; de la Rosa Arranz, José Maria; González-Vila, Francisco Javier; González-Perez, José Antonio; Manning, David A C (2006): Elucidation of different forms of organic carbon in marine sediments from the Atlantic coast of Spain using thermal analysis coupled to isotope ratio and quadrupole mass spectrometry. Organic Geochemistry, 37(12), 1983-1994, https://doi.org/10.1016/j.orggeochem.2006.07.025
Ksionzek, Kerstin B; Zhang, Jing; Ludwichowski, Kai-Uwe; Wilhelms-Dick, Dorothee; Trimborn, Scarlett; Jendrossek, Thomas; Kattner, Gerhard; Koch, Boris P (2018): Stoichiometry, polarity, and organometallics in solid-phase extracted dissolved organic matter of the Elbe-Weser estuary. PLoS ONE, 13(9), e0203260, https://doi.org/10.1371/journal.pone.0203260
Mollenhauer, Gesine; Grotheer, Hendrik; Gentz, Torben; Bonk, Elizabeth; Hefter, Jens (2021): Standard operation procedures and performance of the MICADAS radiocarbon laboratory at Alfred Wegener Institute (AWI), Germany. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 496, 45-51, https://doi.org/10.1016/j.nimb.2021.03.016
Smeaton, Craig; Austin, William EN (2022): Quality Not Quantity: Prioritizing the Management of Sedimentary Organic Matter Across Continental Shelf Seas. Geophysical Research Letters, 49(5), https://doi.org/10.1029/2021GL097481
Funding:
Helmholtz Association of German Research Centres (HGF), grant/award no. PIE-0018: German-Italian partnership project between AWI and CNR-ISP on Chronologies for Polar Paleoclimate Archives (PAIGE)
Coverage:
Median Latitude: 72.457200 * Median Longitude: 127.383455 * South-bound Latitude: 72.376970 * West-bound Longitude: 126.480560 * North-bound Latitude: 72.537430 * East-bound Longitude: 128.286350
Date/Time Start: 2018-04-13T00:00:00 * Date/Time End: 2019-04-05T00:00:00
Minimum DEPTH, sediment/rock: 7.26 m * Maximum DEPTH, sediment/rock: 22.55 m
Event(s):
CAC19-Y1 (CAC19-Y) * Latitude: 72.537430 * Longitude: 128.286350 * Date/Time: 2019-04-05T00:00:00 * Elevation: 6.0 m * Location: Lena Delta, Siberia * Campaign: RU-Land_2019_Lena (Lena 2019) * Basis: AWI Arctic Land Expedition * Method/Device: Soil profile (SOIL) * Comment: Drilled with a Makita hand drill, HSS bimetal hole saw attachment with 5.4 cm diameter. Always 3 samples next to each other, except of the topmost one.
SAM18-01 * Latitude: 72.376970 * Longitude: 126.480560 * Date/Time Start: 2018-04-13T00:00:00 * Date/Time End: 2018-04-20T00:00:00 * Campaign: RU-Land_2018_Lena (Lena 2018) * Basis: AWI Arctic Land Expedition * Method/Device: Drilling/drill rig (DRILL) * Comment: URB2-4T drilling rig
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Lin, Tsai-Wen | |||
| 2 | DEPTH, sediment/rock | Depth sed | m | Lin, Tsai-Wen | Geocode | |
| 3 | Carbon, organic, dissolved, water extractable, per unit mass total organic carbon | DOC WE/TOC | mg/g | Lin, Tsai-Wen | High catalytic combustion, Shimadzu, Shimadzu TOC-VCPH | DOC concentration [mg/g OC] |
| 4 | Organic matter, labile, per unit sediment mass | OML/sed | mg/g | Lin, Tsai-Wen | Thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC), Mettler Toledo, TGA/DSC 1 | |
| 5 | Organic matter, recalcitrant and refractory, per unit sediment mass | OMR/sed | mg/g | Lin, Tsai-Wen | Thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC), Mettler Toledo, TGA/DSC 1 | |
| 6 | Organic matter, labile | OML | % | Lin, Tsai-Wen | Calculated | |
| 7 | Fraction modern carbon | F14C | Lin, Tsai-Wen | Mini Carbon Dating System (MICADAS) | ||
| 8 | Fraction modern carbon, error | F14C e | ± | Lin, Tsai-Wen | Mini Carbon Dating System (MICADAS) | |
| 9 | Comment | Comment | Lin, Tsai-Wen |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
29 data points