Citation:

bor.12385

Name: Holocene hydrological variability of Lake Ladoga, northwest Russia, as inferred from diatom oxygen isotopes
Published: 2019-03-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: biogenic silica; Climate changes; lake sediments; palaeohydrology; Stable isotopes

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Abstract:

This article presents a new comprehensive assessment of the Holocene hydrological variability of Lake Ladoga, northwest Russia. The reconstruction is based on oxygen isotopes of lacustrine diatom silica (δ18O diatom) preserved in sediment core Co 1309, and is complemented by a diatom assemblage analysis and a survey of modern isotope hydrology. The data indicate that Lake Ladoga has existed as a freshwater reservoir since at least 10.8 cal. ka BP. The δ18O diatom values range from +29.8 to +35.0‰, and relatively higher δ18O diatom values around +34.7‰ between c. 7.1 and 5.7 cal. ka BP are considered to reflect the Holocene Thermal Maximum. A continuous depletion in δ18O diatom since c. 6.1 cal. ka BP accelerates after c. 4 cal. ka BP, indicating Middle to Late Holocene cooling that culminates during the interval 0.8-0.2 cal. ka BP, corresponding to the Little Ice Age. Lake-level rises result in lower δ18O diatom values, whereas lower lake levels cause higher δ18O diatom values. The diatom isotope record gives an indication for a rather early opening of the Neva River outflow at c. 4.4-4.0 cal. ka BP. Generally, overall high δ18O diatom values around +33.5‰ characterize a persistent evaporative lake system throughout the Holocene. As the Lake Ladoga δ18O diatom record is roughly in line with the 60°N summer insolation, a linkage to broader-scale climate change is likely.

Keyword(s):

biogenic silica; Climate changes; lake sediments; palaeohydrology; Stable isotopes

Project(s):

Paleolimnological Transect (PLOT)

Polar Terrestrial Environmental Systems @ AWI (AWI_Envi)

Funding:

Federal Ministry of Education and Research (BMBF), grant/award no. 03G0859: Paleolimnological Transect

Coverage:

Latitude: 60.983300 * Longitude: 30.683300

Date/Time Start: 2013-09-01T00:00:00 * Date/Time End: 2013-09-01T00:00:00

Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 1.87 m

Event(s):

Co1309 * Latitude: 60.983300 * Longitude: 30.683300 * Date/Time: 2013-09-01T00:00:00 * Lake water depth: 111 m * Penetration: 22.7 m * Location: Ladoga Lake, Russia * Method/Device: Core (CORE)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Core	Core		Kostrova, Svetlana S
2	DEPTH, sediment/rock	Depth sed	m	Kostrova, Svetlana S		Geocode
3	Calendar age	Cal age	ka BP	Kostrova, Svetlana S
4	Silicon dioxide	SiO2	%	Kostrova, Svetlana S		content in the purified diatom sample
5	Aluminium oxide	Al2O3	%	Kostrova, Svetlana S		content in the purified diatom sample
6	Sodium oxide	Na2O	%	Kostrova, Svetlana S		content in the purified diatom sample
7	Magnesium oxide	MgO	%	Kostrova, Svetlana S		content in the purified diatom sample
8	Potassium oxide	K2O	%	Kostrova, Svetlana S		content in the purified diatom sample
9	Calcium oxide	CaO	%	Kostrova, Svetlana S		content in the purified diatom sample
10	Manganese oxide	MnO	%	Kostrova, Svetlana S		content in the purified diatom sample
11	Iron oxide, FeO	FeO	%	Kostrova, Svetlana S		content in the purified diatom sample
12	Sum	Sum	%	Kostrova, Svetlana S
13	Diatoms, δ18O	Diatoms δ18O	‰ SMOW	Kostrova, Svetlana S	Measured
14	Contamination	Contamination	%	Kostrova, Svetlana S
15	Diatoms, δ18O	Diatoms δ18O	‰ SMOW	Kostrova, Svetlana S	Contamination corrected

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

336 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Core	2 Depth sed [m]	3 Cal age [ka BP]	4 SiO2 [%] (content in the purified diato...)	5 Al2O3 [%] (content in the purified diato...)	6 Na2O [%] (content in the purified diato...)	7 MgO [%] (content in the purified diato...)	8 K2O [%] (content in the purified diato...)	9 CaO [%] (content in the purified diato...)	10 MnO [%] (content in the purified diato...)	11 FeO [%] (content in the purified diato...)	12 Sum [%]	13 Diatoms δ18O [‰ SMOW] (Measured)	14 Contamination [%]	15 Diatoms δ18O [‰ SMOW] (Contamination corrected)
Co1309-14-III	0.03	0.203	98.98	0.23	0.55	0.10	0.02	0.06	0.01	0.05	100.00	29.49	1.6	29.76
Co1309-14-III	0.11	0.793	99.08	0.35	0.33	0.04	0.03	0.04	0.04	0.10	100.00	32.03	2.4	32.49
Co1309-14-III	0.19	1.373	99.05	0.34	0.30	0.04	0.03	0.10	0.03	0.11	100.00	30.76	2.3	31.18
Co1309-14-III	0.27	1.939	98.77	0.41	0.37	0.08	0.06	0.08	0.03	0.19	100.00	31.79	2.8	32.33
Co1309-14-III	0.35	2.483	98.89	0.43	0.32	0.07	0.06	0.03	0.04	0.16	100.00	31.44	2.9	32.00
Co1309-14-III	0.43	3.001	98.80	0.61	0.19	0.07	0.09	0.06	0.03	0.16	100.00	31.74	4.1	32.56
Co1309-14-III	0.51	3.495	98.17	0.68	0.58	0.13	0.10	0.07	0.04	0.23	100.01	32.11	4.6	33.04
Co1309-14-III	0.59	3.969	98.95	0.48	0.21	0.07	0.01	0.09	0.06	0.14	100.00	33.53	3.3	34.23
Co1309-14-III	0.67	4.425	98.44	0.70	0.25	0.10	0.06	0.11	0.07	0.27	100.00	31.48	4.7	32.41
Co1309-14-II	0.75	4.868	98.73	0.62	0.21	0.09	0.10	0.08	0.03	0.16	100.01	32.64	4.2	33.51
Co1309-14-II	0.83	5.301	98.54	0.71	0.23	0.10	0.03	0.11	0.06	0.22	100.00	32.62	4.8	33.62
Co1309-14-II	0.91	5.727	98.70	0.59	0.34	0.06	0.04	0.08	0.05	0.15	100.00	33.67	4.0	34.54
Co1309-14-II	0.99	6.150	98.74	0.43	0.46	0.08	0.06	0.04	0.04	0.16	100.00	34.22	2.9	34.86
Co1309-14-II	1.07	6.574	98.79	0.70	0.13	0.07	0.02	0.05	0.03	0.21	100.00	33.62	4.7	34.65
Co1309-14-II	1.15	7.001	98.50	0.70	0.40	0.10	0.06	0.07	0.04	0.15	100.01	33.67	4.7	34.71
Co1309-14-II	1.23	7.437	98.70	0.58	0.25	0.10	0.03	0.08	0.02	0.23	100.00	33.31	3.9	34.15
Co1309-14-II	1.31	7.883	98.68	0.55	0.35	0.11	0.03	0.06	0.03	0.19	100.00	33.24	3.7	34.03
Co1309-14-I	1.40	8.394	98.72	0.55	0.22	0.13	0.06	0.11	0.01	0.21	100.01	33.18	3.7	33.97
Co1309-14-I	1.47	8.790	97.58	1.02	0.28	0.27	0.11	0.16	0.02	0.57	100.00	33.38	6.9	34.91
Co1309-14-I	1.55	9.235	97.13	0.93	0.85	0.27	0.13	0.13	0.07	0.50	100.00	33.11	6.3	34.48
Co1309-14-I	1.63	9.662	95.42	1.58	0.80	0.69	0.28	0.07	0.02	1.14	100.00	32.66	10.7	35.05
Co1309-14-I	1.71	10.062	95.95	1.42	0.65	0.64	0.26	0.12	0.01	0.95	100.00	32.42	9.6	34.51
Co1309-3-II	1.79	10.428	98.15	0.63	0.58	0.14	0.10	0.12	0.05	0.24	100.00	32.34	4.3	33.21
Co1309-3-II	1.87	10.750	97.07	1.09	0.57	0.38	0.15	0.11	0.03	0.61	100.01	31.89	7.4	33.41