/* DATA DESCRIPTION:
Citation:	You, Defang; Stein, Ruediger; Lohmann, Gerrit; Masoum, Ahmadreza; Fahl, Kirsten; Wu, Junjie; Jackson, Rebecca (2025): The highly branched isoprenoid and the open-water phytoplankton biomarker analysis of sediment core SL170 from Baffin Bay [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.982609
Abstract:	This dataset presents biomarker records from sediment core SL170 (MSM09/02-0455/13; 68°58.15′ N, 59°23.58′ W; 1078 m water depth), recovered from eastern Baffin Bay during the MSM09/02 expedition of R/V Maria S. Merian. The highly branched isoprenoid (IP25) and the open-water phytoplankton biomarker (dinosterol) were analysed to reconstruct past sea ice algal productivity and primary production, respectively, covering the period from ~17,000 to 10,000 years BP. The PDIP25 index was further calculated to provide semi-quantitative estimates of past sea ice cover. Biomarker analyses were carried out at the Alfred Wegener Institute, Bremerhaven.
Keyword(s):	Baffin Bay; Biomarkers; Primary production; Sea ice
Supplement to:	You, Defang; Stein, Ruediger; Lohmann, Gerrit; Masoum, Ahmadreza; Fahl, Kirsten; Wu, Junjie; Jackson, Rebecca (2026): Surface freshening in the subpolar North Atlantic sustaining the weakened AMOC during the late Younger Dryas. Science Advances, 12(1), eadv6220, https://doi.org/10.1126/sciadv.adv6220
Funding:	German Research Foundation (DFG) (URI: http://www.dfg.de/en/), grant/award no. 221211316: GRK/IRTG 1904: ArcTrain - Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic (URI: https://gepris.dfg.de/gepris/projekt/221211316)
Coverage:	LATITUDE: 68.969200 * LONGITUDE: -59.393000
	DATE/TIME START: 2008-09-05T10:13:00 * DATE/TIME END: 2008-09-05T10:13:00
	MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 6.765 m
Event(s):	MSM09/2_455-13 (GeoTü SL 170) * LATITUDE: 68.969200 * LONGITUDE: -59.393000 * DATE/TIME: 2008-09-05T10:13:00 * ELEVATION: -1091.0 m * LOCATION: Davis Strait * CAMPAIGN: MSM09/2 * BASIS: Maria S. Merian (URI: https://en.wikipedia.org/wiki/RV_Maria_S._Merian) * METHOD/DEVICE: Gravity corer (GC) * COMMENT: rope length max. 1114m
Comment:	This dataset includes concentrations of IP25 and dinosterol from sediment core SL170 (Baffin Bay), covering the period from 17,000 to 10,000 years BP. IP25 concentrations reflect sea ice algal productivity, while dinosterol serves as an indicator of open-water phytoplankton productivity. Based on these biomarker concentrations, the PDIP25 index was calculated to provide semi-quantitative estimates of past sea ice cover. For intervals in which either the IP25 or the dinosterol levels are zero or very low, the PDIP25 values are indeterminable and are not displayed in the data set.
Parameter(s):	DEPTH, sediment/rock [m] (Depth sed) * GEOCODE * PI: You, Defang (https://orcid.org/0000-0001-8835-3254, defang.you@geow.uni-heidelberg.de)
	AGE [ka BP] (Age) * GEOCODE * PI: You, Defang (https://orcid.org/0000-0001-8835-3254, defang.you@geow.uni-heidelberg.de)
	2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon [µg/g] (IP25/TOC) * PI: You, Defang (https://orcid.org/0000-0001-8835-3254, defang.you@geow.uni-heidelberg.de) * METHOD/DEVICE: Gas chromatography - Mass spectrometry (GC-MS)
	4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon [µg/g] (Dinosterol/TOC) * PI: You, Defang (https://orcid.org/0000-0001-8835-3254, defang.you@geow.uni-heidelberg.de) * METHOD/DEVICE: Gas chromatography - Mass spectrometry (GC-MS)
	Phytoplankton biomarker Dinosterol IP25 index (PDIP25) * PI: You, Defang (https://orcid.org/0000-0001-8835-3254, defang.you@geow.uni-heidelberg.de) * METHOD/DEVICE: Calculated
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:	269 data points
*/
Depth sed [m]	Age [ka BP]	IP25/TOC [µg/g]	Dinosterol/TOC [µg/g]	PDIP25
0.005	10.09	1.933	4.706	0.504
0.085	10.17	1.111	7.457	0.269
0.165	10.25	0.896	5.894	0.273
0.245	10.33	0.761	6.214	0.232
0.325	10.41	0.814	5.468	0.269
0.405	10.49	0.619	3.830	0.286
0.485	10.58	0.619	1.560	0.495
0.565	10.67	0.624	1.768	0.466
0.645	10.76	0.975	2.542	0.487
0.725	10.84	1.226	2.854	0.515
0.805	10.93	1.917	2.177	0.685
0.905	11.04	2.079	1.114	0.822
0.965	11.11	2.074	1.358	0.791
1.045	11.19	2.311	2.555	0.691
1.125	11.26	2.811	3.172	0.687
1.185	11.32	2.607	4.816	0.572
1.285	11.41	1.109	3.104	0.469
1.365	11.49	0.975	3.416	0.414
1.405	11.52	3.425	4.274	0.665
1.465	11.58	1.615	2.318	0.633
1.525	11.64	3.348	2.476	0.770
1.605	11.71	1.579	2.906	0.573
1.685	11.78	2.973	3.589	0.672
1.755	11.83	4.131	5.195	0.663
1.835	11.90	4.719	4.541	0.720
1.925	11.97	4.513	3.319	0.771
2.005	12.03	3.241	4.153	0.659
2.085	12.09	1.560	3.419	0.530
2.165	12.15	2.917	2.107	0.774
2.245	12.22	0.625	2.495	0.382
2.325	12.28	0.910	3.324	0.404
2.405	12.35	1.205	4.171	0.417
2.445	12.38	1.036	5.300	0.326
2.485	12.41	0.994	5.453	0.311
2.525	12.44	0.976	6.725	0.264
2.565	12.47	1.092	5.820	0.317
2.605	12.50	2.367	1.934	0.752
2.645	12.53	1.028	3.236	0.440
2.725	12.59	2.954	3.860	0.654
2.805	12.64	2.269	4.503	0.555
2.855	12.67	2.409	3.807	0.610
2.895	12.70	2.261	5.669	0.496
2.965	12.76	2.331	4.759	0.548
3.035	12.82	2.477	5.845	0.512
3.125	12.90	2.218	6.079	0.474
3.205	12.97	1.862	2.651	0.635
3.285	13.04	2.367	3.679	0.614
3.365	13.11	2.053	4.135	0.551
3.445	13.18	2.173	3.721	0.591
3.495	13.22	2.872	6.409	0.526
3.555	13.28	2.237	4.743	0.538
3.605	13.32	2.329	4.060	0.587
3.685	13.39	1.364	4.895	0.408
3.765	13.46	1.230	1.989	0.605
3.845	13.53	1.580	4.754	0.451
3.925	13.60	2.259	8.487	0.397
4.005	13.67	1.983	7.076	0.409
4.085	13.76	2.231	6.758	0.449
4.165	13.84	2.181	6.353	0.459
4.245	13.93	1.843	6.348	0.418
4.325	14.01	2.167	6.159	0.465
4.405	14.09	2.079	5.422	0.487
4.485	14.18	1.553	5.609	0.406
4.555	14.25	2.377	9.973	0.371
4.645	14.35	3.229	12.286	0.394
4.715	14.43	3.296	12.879	0.388
4.755	14.47	2.741	11.321	0.374
4.815	14.53	1.408	11.315	0.235
4.875	14.60	1.288	10.291	0.236
4.965	14.70	3.033	7.011	0.517
5.045	14.80	1.171	1.727	0.626
5.105	14.87	0.638	0.385	
5.155	14.93	2.264	4.463	0.556
5.205	15.00	1.064	3.482	0.430
5.285	15.09	0.252	3.827	0.140
5.365	15.19	0.213	2.292	0.187
5.445	15.29	0.490	0.151	
5.505	15.36	0.371	0.000	
5.555	15.43	0.616	0.461	
5.605	15.49	1.385	1.617	0.679
5.685	15.58	1.210	4.200	0.416
5.765	15.68	0.711	2.110	0.454
5.835	15.77	0.577	0.105	0.932
5.905	15.85	0.000	0.000	
5.985	15.95	0.982	0.596	
6.065	16.05	0.798	0.661	
6.145	16.15	0.605	0.000	
6.225	16.25	0.609	0.000	
6.315	16.35	0.733	0.560	
6.385	16.44	0.398	0.999	
6.465	16.52	0.614	1.463	
6.545	16.60	0.591	0.471	
6.625	16.68	0.705	0.911	
6.705	16.76	0.534	0.917	
6.765	16.82	0.480	0.000