/* DATA DESCRIPTION:
Citation:	Lin, Tsai-Wen; Grotheer, Hendrik; Hefter, Jens; Mollenhauer, Gesine (2026): Compound specific radiocarbon data from sediment core PS51/154-11, western Laptev Sea, Arctic Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.996476
Abstract:	Subsample slices thick between 1 and 4 cm were taken from sediment core PS51/159-10 for compound-specific radiocarbon analysis (CSRA) for terrestrial biomarkers. The subsample intervals were selected based on downcore variations in biomarker contents (Lin et al., 2025), to correspond to periods of rapid and little terrestrial organic matter mobilizations during the early last deglaciation and the Holocene. Target compounds include mid-chain (n-C23, n-C25) n-alkanes, high molecular weight (HMW, or long-chain) (n-C29, n-C31) n-alkanes, and HMW (n-C28:0) fatty acid. Lipid extractions and purifications for CSRA followed the procedure described in Winterfeld et al. (2018). Radiocarbon measurements on isolated compounds were conducted on samples containing a minimum of 40 µg C using a Mini Carbon Dating System (MICADAS), following the method described in Mollenhauer et al. (2021). CSRA values were reported as F14C, which were corrected for carbon introduced during methylation (Douglas et al., 2014) and processing blanks (Wacker and Christl, 2011). Processing blanks were assessed by analyzing modern and fossil laboratory standards processed alongside the samples, following Sun et al. (2020). The estimated background introduced during processing contained 5.5 ± 0.5 μg C with F14C = 0.7632 ± 0.0394 for n-C28:0 fatty acid measurements, and 2.4 ± 0.2 μg C with F14C = 0.3671 ± 0.0296 for n-alkane measurements.
Keyword(s):	Arctic Ocean; Biomarker; Compound-specific radiocarbon analysis; CSRA; fatty acids; Laptev Sea; Last deglaciation; Marine Sediment Core; n-alkane; n-alkanoic acids; Radiocarbon dating; terrestrial biomarkers
Supplement to:	Lin, Tsai-Wen; Adolphi, Florian; Grotheer, Hendrik; Hefter, Jens; Tesi, Tommaso; Lachner, Johannes; Winkler, Stella; Wu, Junjie; Queiroz Alves, Eduardo; Mollenhauer, Gesine (preprint): Precisely dated records of pre-aged terrestrial organic matter release to the western Laptev Sea during the last deglaciation. Climate of the Past, https://doi.org/10.5194/egusphere-2026-4726
References:	Douglas, Peter M J; Pagani, Mark; Eglinton, Timothy Ian; Brenner, Mark; Hodell, David A; Curtis, Jason H; Ma, Keith F; Breckenridge, Andy (2014): Pre-aged plant waxes in tropical lake sediments and their influence on the chronology of molecular paleoclimate proxy records. Geochimica et Cosmochimica Acta, 141, 346-364, https://doi.org/10.1016/j.gca.2014.06.030
	Lin, Tsai-Wen; Tesi, Tommaso; Hefter, Jens; Grotheer, Hendrik; Wollenburg, Jutta Erika; Adolphi, Florian; Bauch, Henning A; Nogarotto, Alessio; Müller, Juliane; Mollenhauer, Gesine (2025): Environmental controls of rapid terrestrial organic matter mobilization to the western Laptev Sea since the Last Deglaciation. Climate of the Past, 21(4), 753-772, https://doi.org/10.5194/cp-21-753-2025
	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
	Sun, Shuwen; Meyer, Vera D; Dolman, Andrew M; Winterfeld, Maria; Hefter, Jens; Dummann, Wolf; McIntyre, Cameron; Montluçon, Daniel; Haghipour, Negar; Wacker, Lukas; Gentz, Torben; van der Voort, Tessa Sophia; Eglinton, Timothy Ian; Mollenhauer, Gesine (2020): 14C Blank Assessment in Small-Scale Compound-Specific Radiocarbon Analysis of Lipid Biomarkers and Lignin Phenols. Radiocarbon, 62(1), 207-218, https://doi.org/10.1017/RDC.2019.108
	Wacker, Lukas; Christl, Marcus (2011): Data reduction for small radiocarbon samples–error propagation using the model of constant contamination. In: Ion Beam Physics, ETH Zurich, Annual Report 2011, Laboratory of Ion Beam Physics, ETH Zurich, Zurich, 36-37
	Winterfeld, Maria; Mollenhauer, Gesine; Dummann, Wolf; Köhler, Peter; Lembke-Jene, Lester; Meyer, Vera D; Hefter, Jens; McIntyre, Cameron; Wacker, Lukas; Kokfelt, Ulla; Tiedemann, Ralf (2018): Deglacial mobilization of pre-aged terrestrial carbon from degrading permafrost. Nature Communications, 9(1), https://doi.org/10.1038/s41467-018-06080-w
Funding:	Helmholtz Association of German Research Centres (HGF) (URI: https://www.helmholtz.de), grant/award no. PIE-0018: German-Italian partnership project between AWI and CNR-ISP on Chronologies for Polar Paleoclimate Archives (PAIGE)
	Helmholtz Association of German Research Centres (HGF) (URI: https://www.helmholtz.de), grant/award no. VH-NG 1501
Coverage:	LATITUDE: 77.276000 * LONGITUDE: 120.609833
	DATE/TIME START: 1998-08-16T19:20:00 * DATE/TIME END: 1998-08-16T19:25:00
	MINIMUM DEPTH, sediment/rock: 0.405 m * MAXIMUM DEPTH, sediment/rock: 3.635 m
Event(s):	PS51/154-11 (URI: https://store.pangaea.de/Images/Cores/PS-stationcard/PS51_154-stationcard.pdf) * LATITUDE: 77.276000 * LONGITUDE: 120.609833 * DATE/TIME START: 1998-08-16T19:20:00 * DATE/TIME END: 1998-08-16T19:25:00 * ELEVATION: -270.0 m * PENETRATION: 7.8 m * RECOVERY: 6.74 m * LOCATION: Laptev Sea * CAMPAIGN: ARK-XIV/1b (PS51 Transdrift-V) * BASIS: Polarstern (URI: https://doi.org/10.17815/jlsrf-3-163) * METHOD/DEVICE: Kasten corer (KAL) * COMMENT: 7 core sections: 0.03-0.9, 0.9-1.91, 1.91-2.91, 2.91-3.91, 3.91-4.91, 4.91-5.91, 5.91-6.74 m
Parameter(s):	DEPTH, sediment/rock [m] (Depth sed) * GEOCODE * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de)
	Depth, sediment/rock, top/minimum [m] (Depth sed top) * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de)
	Depth, sediment/rock, bottom/maximum [m] (Depth sed bot) * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de)
	Compounds (Comp) * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de)
	Carbon [µg] (C) * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de) * COMMENT: sample size
	Fraction modern carbon, compound specific (F14C compound) * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de) * METHOD/DEVICE: Mini Carbon Dating System (MICADAS)
	Fraction modern carbon, compound specific, standard deviation [±] (F14C compound std dev) * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de)
	Sample code/label (Sample label) * PI: Lin, Tsai-Wen (https://orcid.org/0000-0002-2244-3705, tsai-wen.lin@awi.de)
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Status:	Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels)
Size:	77 data points
*/
Depth sed [m]	Depth sed top [m]	Depth sed bot [m]	Comp	C [µg]	F14C compound	F14C compound std dev [±]	Sample label
0.405	0.390	0.420	n-C28:0	64	0.0422	0.0089	12986.2.1
1.240	1.230	1.250	n-C28:0	78	0.1811	0.0069	12988.2.1
1.420	1.410	1.430	n-C28:0	58	-0.0212	0.0103	12989.2.1
2.735	2.725	2.745	n-C28:0	64	-0.0123	0.0093	12990.2.1
3.635	3.625	3.645	n-C28:0	47	0.0109	0.0127	12992.2.1
0.680	0.670	0.690	n-C29+n-C31	59	0.0300	0.0023	12987.5.1
1.420	0.670	0.690	n-C29+n-C31	42	0.0257	0.0030	12989.5.1
3.635	3.625	3.645	n-C23	37	0.0019	0.0032	12992.4.1
3.635	3.625	3.645	n-C25	49	0.0131	0.0026	12992.5.1
3.635	3.625	3.645	n-C29	100	0.0283	0.0017	12992.6.1
3.635	3.625	3.645	n-C31	36	0.0161	0.0033	12992.7.1