Naslov
Speleothem-based reconstruction of the Quaternary environments in Croatia

Autori
Lončarić, Robert ; Surić, Maša ; Lončar, Nina ; Buzjak, Nenad ; Bočić, Neven

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
23rd International Karstological School “Classical Karst”: Caves - Exploration and Studies. Guide book & Abstracts / Zupan Hajna, Nadja ; Mihevc, Andrej ; Gostničar, Petra - Postojna : Inštitut za raziskovanje krasa ZRC SAZU, 2015, 130-130

ISBN
978-961-254-808-7

Skup
23rd International Karstological School “Classical Karst”: Caves - Exploration and Studies

Mjesto i datum
Postojna, Slovenija, 15.06.2015. - 20.06.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Speleothems; Quaternary environment; palaeoclimate; Croatia

Sažetak
Reconstruction of Quaternary Environments in Croatia using Isotope Methods (REQUENCRIM) is scientific project funded by the Croatian Science Foundation (2014 – 2018) aimed to the estimation of regional response of the environment in Croatia to global changes during the Quaternary. It is based on diverse approaches and different proxies from speleothems, lake sediments, tufa deposits and marine algal rims. Speleothems are considered as valuable high-resolution paleoclimate archives superb to other archives such as deep-sea cores, ice cores etc. Particularly important proxies are stable isotopes (13C/12C and 18O/16O) recorded in speleothems, as they can provide environmental and climatic information from the past, assuming isotopic equilibrium during carbonate precipitation. In the initial phase of the project, speleothems have been taken from three caves, each located in different environmental and climate settings: Grgosova peć Cave (NW Croatia ; continental climate - Cfb), Lokvarka Cave (W Croatia ; boreal climate – Df), and coastal Modrič Cave (S Croatia, submediterranean climate – Cfa). Both drip water from the sites of removed speleothems and rainwater from outside the caves are collected on a monthly basis during the 1-year period in order to characterize the hydrological behavior of drip sites and isotopic variations of the drip water that feeds the stalagmites. Also, microclimate elements (air temperature and relative humidity) are monitored in front and inside the caves. Stable isotopes ratios of radiometric dated (U-Th, 14C) speleothems will be analysed in order to determine isotopic variations in the past, which reflects temperature fluctuations and vegetation changes above the caves, both governed by the air mass distribution and climate changes. We assume that the calcite precipitation was uninterrupted at the low altitudes even during the coldest periods while higher mountains were covered by the glaciers rendering calcite precipitation impossible. Final results could prove that the present-day Croatia was border zone between two areas with significantly different response to the global climate changes.

Izvorni jezik
Engleski

Znanstvena područja
Geografija

Napomena
Projekt HRZZ-a: Reconstruction of Quaternary Environments in Croatia using Isotope Methods (2014- 2018)

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