/* DATA DESCRIPTION:
Citation:	Rantala, Marttiina V; Israde-Alcántara, Isabel; Safaierad, Reza; Mattielli, Nadine; Tylmann, Wojciech; Smol, John P; Grooms, Christopher; Lepoint, Gilles; Francus, Pierre; Metcalfe, Sarah; Etmański, Paweł; Fagel, Nathalie (2026): Biogeochemistry of a sediment core from Lake Tepetiltic (Nayarit, Mexico) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.990154
Abstract:	Multiproxy biogeochemical and physical data of sediment core LTp22-1 retrieved from Lake Tepetiltic in April 2022. Measurements (elemental and isotope biogeochemistry, visible range spectroscopy, loss on ignition) were performed on discrete sediment samples and extend back to the late 1800s. Ages were estimated using Pb-210 dating and Bayesian age-depth modeling.
Keyword(s):	Anthropocene; biogeochemistry; Carbon accumulation; crater lake; Lake sediment; Mexico; Primary production; Tropical
Supplement to:	Rantala, Marttiina V; Israde-Alcántara, Isabel; Safaierad, Reza; Mattielli, Nadine; Tylmann, Wojciech; Smol, John P; Grooms, Christopher; Lepoint, Gilles; Francus, Pierre; Metcalfe, Sarah; Etmański, Paweł; Fagel, Nathalie (2026): Increasing lake primary production and organic carbon sequestration in tropical Mexican lakes during the past century. CATENA, 273, 110448, https://doi.org/10.1016/j.catena.2026.110448
References:	Aquino-Lopez, Marco A; Blaauw, Maarten; Christen, Andrés; Sanderson, Nicole K (2018): Bayesian Analysis of 210Pb Dating. Journal of Agricultural Biological and Environmental Statistics, 23(3), 317-333, https://doi.org/10.1007/s13253-018-0328-7
	Heiri, Oliver; Lotter, André F; Lemcke, G (2001): Loss on ignition as a method for estimating organic and carbonate content in sediments: reproducibility and comparability of results. Journal of Paleolimnology, 25(1), 101-110, https://doi.org/10.1023/A:1008119611481
	Zhang, Fule; Wang, Jinlong; Baskaran, Mark; Zhong, Qiangqiang; Wang, Yali; Paatero, Jussi; Du, Jinzhou (2021): A global dataset of atmospheric 7Be and 210Pb measurements: annual air concentration and depositional flux. Earth System Science Data, 13(6), 2963-2994, https://doi.org/10.5194/essd-13-2963-2021
Funding:	Fonds de la Recherche Scientifique (FNRS), grant/award no. PDR T.0079.21: Holocene Mexican Crater Lakes and Climate (HolMeCl)
Coverage:	LATITUDE: 21.277661 * LONGITUDE: -104.690167
	DATE/TIME START: 2022-04-08T00:00:00 * DATE/TIME END: 2022-04-08T00:00:00
	MINIMUM DEPTH, sediment/rock: 0.0025 m * MAXIMUM DEPTH, sediment/rock: 0.1950 m
Event(s):	LTp22-1 * LATITUDE: 21.277661 * LONGITUDE: -104.690167 * DATE/TIME: 2022-04-08T00:00:00 * ELEVATION: 1430.0 m * LOCATION: Lake Tepetiltic, Nayarit, Mexico * METHOD/DEVICE: Sediment corer, UWITEC
Parameter(s):	DEPTH, sediment/rock [m] (Depth sed) * GEOCODE * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * COMMENT: Middle depth of sediment section.
	Depth, sediment/rock, top/minimum [m] (Depth sed top) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * COMMENT: Top depth of sediment section.
	Depth, sediment/rock, bottom/maximum [m] (Depth sed bot) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * COMMENT: Bottom depth of sediment section.
	Age [a AD/CE] (Age) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Bayesian age model, according to Aquino-López et al. (2018) (URI: https://doi.org/10.1007/s13253-018-0328-7) * COMMENT: Mean age for middle depth of sediment section, Plum version 0.5.1 by Aquino-López et al. (2018 , doi:10.1007/s13253-018-0328-7).
	AGE [ka BP] (Age) * GEOCODE * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com)
	Organic matter [%] (OM) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Determined by loss on ignition at 550 °C, according to Heiri et al. (2010) (URI: https://doi.org/10.1023/A:1008119611481)
	Carbonates [%] (Carb) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Determined by loss on ignition at 950 °C, according to Heiri et al. (2010) (URI: https://doi.org/10.1023/A:1008119611481)
	Density, dry bulk [g/cm**3] (DBD) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Calculated, see Comment * COMMENT: Mass of dry sediment divided by wet sediment volume (1 cm³).
	Sedimentation rate per year [cm/a] (SR) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Calculated, see Comment * COMMENT: Sediment section thickness divided by elapsed time.
	Accumulation rate, mass, per year [g/cm**2/a] (MAR) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Calculated, see Comment * COMMENT: Dry bulk density multiplied by sediment accumulation rate.
	Accumulation rate, mass, carbon, organic, total [g/m**2/a] (MAR TOC) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Calculated, see Comment * COMMENT: Sediment organic carbon content multiplied by mass accumulation rate.
	Accumulation rate, mass, carbon, organic, total [g/m**2/a] (MAR TOC) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Calculated, see Comment * COMMENT: Sediment organic carbon content multiplied by mass accumulation rate. Values corrected for sediment focusing based on measured unsupported 210Pb flux in the sediment core and atmospheric 210Pb flux estimated based on mean annual precipitation and Zhang et al. (2021, doi:10.5194/essd-13-2963-2021) equations for latitudinal bands 10-20°N and 20-30°N.
	Carbon, organic, total [%] (TOC) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Elemental analyzer (EA), Elementar, vario MICRO cube
	Nitrogen, total [%] (TN) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Elemental analyzer (EA), Elementar, vario MICRO cube
	δ13C [‰] (δ13C) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Isotope ratio mass spectrometer (IRMS), Elementar, isoprime precisION * COMMENT: Values from acidified samples.
	δ15N [‰] (δ15N) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Isotope ratio mass spectrometer (IRMS), Elementar, isoprime precisION * COMMENT: Values from nonacidified samples.
	Carbon/Nitrogen ratio [mol/mol] (C/N) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Elemental analyzer (EA), Elementar, vario MICRO cube * COMMENT: Calculated based on values from acidified samples for both elements, mass ratio multiplied by 1.167.
	Chlorophyll a, per dry mass [mg/g] (Chl a/dm) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Visible-near infrared spectroscopy, Foss NIRsystems, Model 6500 Rapid Content Analyzer
	Chlorophyll a, z-score (Chl a z) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Visible-near infrared spectroscopy, Foss NIRsystems, Model 6500 Rapid Content Analyzer * COMMENT: Initial values z-score transformed.
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:	393 data points
*/
Depth sed [m] (Middle depth of sediment sect...)	Depth sed top [m] (Top depth of sediment section.)	Depth sed bot [m] (Bottom depth of sediment sect...)	Age [a AD/CE] (Mean age for middle depth of ...)	Age [ka BP]	OM [%] (Determined by loss on ignitio...)	Carb [%] (Determined by loss on ignitio...)	DBD [g/cm**3] (Mass of dry sediment divided ...)	SR [cm/a] (Sediment section thickness di...)	MAR [g/cm**2/a] (Dry bulk density multiplied b...)	MAR TOC [g/m**2/a] (Sediment organic carbon conte...)	MAR TOC [g/m**2/a] (Sediment organic carbon conte...)	TOC [%] (Elemental analyzer (EA), Elem...)	TN [%] (Elemental analyzer (EA), Elem...)	δ13C [‰] (Values from acidified samples...)	δ15N [‰] (Values from nonacidified samp...)	C/N [mol/mol] (Calculated based on values fr...)	Chl a/dm [mg/g] (Visible-near infrared spectro...)	Chl a z (Initial values z-score transf...)
0.0025	0.000	0.005	2021.4	-0.07140	31.13	2.95	0.180	0.294	0.053	68.14	156.04	12.88	1.30	-19.64	1.66	12.05	0.026	0.096
0.0075	0.005	0.010	2019.6	-0.06960			0.197	0.294	0.058	75.69	173.33	13.05	1.31	-19.63	1.73	11.74		
0.0125	0.010	0.015	2017.8	-0.06780	31.31	3.17	0.215	0.250	0.054									
0.0175	0.015	0.020	2015.8	-0.06580			0.183	0.263	0.048	63.28	144.91	13.18	1.34	-19.09	1.38	11.78	0.025	-0.129
0.0225	0.020	0.025	2014.1	-0.06410	32.25	3.62	0.150	0.333	0.050									
0.0300	0.025	0.035	2012.0	-0.06200			0.147	0.345	0.051	73.18	167.59	14.47	1.50	-20.32	1.23	11.53	0.035	1.886
0.0325	0.030	0.035	2011.2	-0.06120	33.29	3.93	0.145	0.333	0.048									
0.0400	0.035	0.045	2009.0	-0.05900			0.143	0.294	0.042	60.86	139.36	14.43	1.52	-19.65	1.30	11.67	0.034	1.549
0.0425	0.040	0.045	2008.0	-0.05800	32.94	3.62	0.143	0.263	0.038									
0.0500	0.045	0.055	2005.3	-0.05530			0.146	0.263	0.038	55.37	126.79	14.45	1.47	-18.54	1.36	11.82	0.030	0.817
0.0525	0.050	0.055	2004.3	-0.05430	33.02	3.62	0.147	0.250	0.037									
0.0600	0.055	0.065	2001.4	-0.05140			0.147	0.270	0.040	55.32	126.69	13.94	1.39	-17.84	1.67	12.11	0.027	0.209
0.0625	0.060	0.065	2000.5	-0.05050	31.59	3.15	0.147	0.278	0.041									
0.0700	0.065	0.075	1997.9	-0.04790			0.158	0.263	0.042	55.21	126.42	13.25	1.31	-17.63	1.95	12.26	0.025	-0.143
0.0725	0.070	0.075	1996.8	-0.04680	30.10	3.36	0.162	0.238	0.039									
0.0800	0.075	0.085	1993.8	-0.04380			0.168	0.192	0.032	41.69	95.47	12.91	1.26	-17.60	1.98	12.39	0.024	-0.287
0.0825	0.080	0.085	1992.2	-0.04220	29.03	3.44	0.170	0.156	0.027									
0.0875	0.085	0.090	1989.0	-0.03900			0.148	0.156	0.023	29.78	68.21	12.91	1.27	-17.31	1.84	12.04		
0.0925	0.090	0.095	1985.3	-0.03530	39.68	4.98	0.126	0.122	0.015									
0.0975	0.095	0.100	1981.2	-0.03120			0.151	0.119	0.018	22.55	51.64	12.55	1.25	-17.30	1.82	11.85	0.026	0.089
0.1050	0.100	0.110	1975.7	-0.02570	28.33	3.52	0.189	0.147	0.028	33.76	77.31	12.13	1.22	-17.56	2.04	11.87		
0.1150	0.110	0.120	1969.2	-0.01920	28.17	3.46	0.181	0.161	0.029	35.97	82.37	12.34	1.28	-16.92	1.83	11.65		
0.1250	0.120	0.130	1961.7	-0.01170	28.32	3.33	0.176	0.112	0.020	24.22	55.46	12.28	1.29	-16.97	1.86	11.65	0.024	-0.342
0.1350	0.130	0.140	1950.4	-0.00040	24.58	3.04	0.246	0.073	0.018	22.55	51.65	12.55	1.29	-16.94	1.75	11.72		
0.1450	0.140	0.150	1936.4	0.01360	27.67	2.99	0.232	0.070	0.016	19.55	44.78	11.98	1.25	-16.99	1.91	11.57	0.022	-0.772
0.1550	0.150	0.160	1922.6	0.02740	24.99	3.69	0.225	0.075	0.017	18.09	41.44	10.78	1.12	-17.55	2.17	11.53		
0.1650	0.160	0.170	1909.7	0.04030	26.58	3.34	0.199	0.081	0.016	16.77	38.41	10.43	1.10	-17.84	2.23	11.53	0.019	-1.317
0.1750	0.170	0.180	1897.6	0.05240	24.80	2.99	0.209	0.085	0.018	18.11	41.46	10.23	1.07	-18.07	2.25	11.41		
0.1850	0.180	0.190	1885.5	0.06455	24.48	2.98	0.228	0.080	0.018	17.43	39.92	9.56	0.99	-18.73	2.48	11.63	0.017	-1.657
0.1950	0.190	0.200	1873.0	0.07705	23.07	3.25	0.234	0.080	0.019	17.66	40.43	9.43	0.97	-19.08	2.58	11.67