Holocene hydrological variability of Lake Ladoga, northwest Russia, as inferred from diatom oxygen isotopes

Svetlana S. Kostrova, Hanno Meyer, Hannah L. Bailey, Anna V. Ludikova, Raphael Gromig, Gerhard Kuhn, Yuri A. Shibaev, Anna V. Kozachek, Alexey A. Ekaykin, Bernhard Chapligin

Результат исследований: Научные публикации в периодических изданияхстатья

2 Цитирования (Scopus)

Аннотация

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 (δ 18 O 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 δ 18 O diatom values range from +29.8 to +35.0‰, and relatively higher δ 18 O 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 δ 18 O 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 δ 18 O diatom values, whereas lower lake levels cause higher δ 18 O 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 δ 18 O diatom values around +33.5‰ characterize a persistent evaporative lake system throughout the Holocene. As the Lake Ladoga δ 18 O diatom record is roughly in line with the 60°N summer insolation, a linkage to broader-scale climate change is likely.

Язык оригиналаанглийский
ЖурналBoreas
DOI
СостояниеОпубликовано - 1 янв 2019

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Предметные области Scopus

  • Экология, эволюция поведение и систематика
  • Археология
  • Геология

Цитировать

Kostrova, S. S., Meyer, H., Bailey, H. L., Ludikova, A. V., Gromig, R., Kuhn, G., ... Chapligin, B. (2019). Holocene hydrological variability of Lake Ladoga, northwest Russia, as inferred from diatom oxygen isotopes. Boreas. https://doi.org/10.1111/bor.12385