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Kostrova, Svetlana S; Meyer, Hanno; Bailey, Hannah; Ludikova, Anna V; Gromig, Raphael; Kuhn, Gerhard; Shibaev, Yu A; Kozachek, Anna; Ekaykin, Alexey A; Chapligin, Bernhard (2019): Holocene hydrological variability of Lake Ladoga, northwest Russia, as inferred from diatom oxygen isotopes. PANGAEA, https://doi.org/10.1594/PANGAEA.899329, Supplement to: Kostrova, Svetlana S; Meyer, Hanno; Bailey, Hannah; Ludikova, Anna V; Gromig, Raphael; Kuhn, Gerhard; Shibaev, Yu A; Kozachek, A V; Ekaykin, Alexey A; Chapligin, Bernhard (2019): Holocene hydrological variability of Lake Ladoga, northwest Russia, as inferred from diatom oxygen isotopes. Boreas, 48(2), 361-376, https://doi.org/10.1111/bor.12385

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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):
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):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1CoreCoreKostrova, Svetlana S
2DEPTH, sediment/rockDepthmKostrova, Svetlana SGeocode
3Calendar ageCal ageka BPKostrova, Svetlana S
4Silicon dioxideSiO2%Kostrova, Svetlana Scontent in the purified diatom sample
5Aluminium oxideAl2O3%Kostrova, Svetlana Scontent in the purified diatom sample
6Sodium oxideNa2O%Kostrova, Svetlana Scontent in the purified diatom sample
7Magnesium oxideMgO%Kostrova, Svetlana Scontent in the purified diatom sample
8Potassium oxideK2O%Kostrova, Svetlana Scontent in the purified diatom sample
9Calcium oxideCaO%Kostrova, Svetlana Scontent in the purified diatom sample
10Manganese oxideMnO%Kostrova, Svetlana Scontent in the purified diatom sample
11Iron oxide, FeOFeO%Kostrova, Svetlana Scontent in the purified diatom sample
12SumSum%Kostrova, Svetlana S
13Diatoms, δ18ODiatoms δ18O‰ SMOWKostrova, Svetlana SMeasured
14ContaminationContamination%Kostrova, Svetlana S
15Diatoms, δ18ODiatoms δ18O‰ SMOWKostrova, Svetlana SContamination corrected
Size:
336 data points

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