A Speleothem Record of Seasonality and Moisture Transport Around the 8.2 ka Event in Central Europe (Vacska Cave, Hungary)

Demény, Attila and Czuppon, György and Kern, Zoltán and Hatvani, István Gábor and Topál, Dániel and Karlik, Máté and Surányi, Gergely and Molnár, Mihály and Kiss, Gabriella Ilona and Szabó, Máté and Shen, Chuan-Chou and Hu, Hsun-Ming and May, Zoltán (2024) A Speleothem Record of Seasonality and Moisture Transport Around the 8.2 ka Event in Central Europe (Vacska Cave, Hungary). QUATERNARY RESEARCH : AN INTERDISCIPLINARY JOURNAL. pp. 1-45. ISSN 0033-5894 (print); 1096-0287 (online) (In Press)

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Abstract

A stalagmite was collected in northern Hungary from the Vacska Cave, where monitoring and ventilation-based site selection had been conducted. The stalagmite covers the 10 to 8 ka (rel 1950 CE) period, including the so-called 8.2 ka event, and showed preceding signs of climate change that were evaluated by petrographic observations, 14C activities, Sr concentrations, and stable isotope compositions of calcite and inclusion-hosted water. Comparisions of speleothem records show that isotope peaks at ~8.5 ka are related to a regional climate anomaly, rather than to a continental-scale event. In accordance with regional proxy records, the 8.2 ka event was associated with a series of temperature and precipitation amount changes, starting with cooling and a reduction in the winter-summer precipitation ratio, and then becoming a humid and warm phase at 8.15 ka. X-Ray diffraction-based crystallinity parameter (FWHM) values provided evidence for diagenenetic alteration of the stable oxygen isotope compositions of inclusion waters. Nevertheless, the stable hydrogen isotope compositions of inclusion waters and the oxygen isotope values of the host calcite revealed elevated d-excess values and therefore increased Mediterranean moisture contribution during the 8.2 ka event, which indirectly indicates the southward displacement of moisture transport from the Atlantic Ocean.

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