Palaeoecological reconstruction of Global Environmental changes at the Younger Dryas Onset Czech-American Scientific Cooperation, project of the Ministry of Education, Youth and Sports (MEYS),
program Inter-Excellence, sub-program Inter-Action, project no. LTAUSA19141
Duration: November 1, 2019 - December 31, 2022 (38 months)
Research Team Members:
Assoc. Prof. Günther Kletetschka (Faculty of Science, Charles University, Prague): head of the Czech team (PI); co-ordination of the team activities, XRF, SEM and EDAX analyses, geochemical analyses of volcanic glass, geochemical and geophysical analysis of impact particles (=micro-spherules or MSPs), analysis of magnetic properties of sediments (magnetic susceptibility, magnetic remanence)
Dr. Daniel Vondrák (Faculty of Science, Charles University, Prague): postdoctoral research fellow; correlation of parallel cores and their lithological characterization, age-depth modelling, loss-on-ignition (LOI), analysis of chironomid head capsules (Diptera: Chironomidae) in the sediment cores
Dr. Eva Švecová (Faculty of Science, Charles University, Prague): postdoctoral research fellow; XRF scanning of lake sediment cores, microscopic analyses of microparticles including MSPs and pyrite framboids, management of the database of project results with focus on distribution of MSPs and volcanic tephra
MSc. Marian Takáč (Faculty of Science, Charles University, Prague): PhD student; robotized geophysical analyses, maintenance of robotized XRF systems, magnetic separation of MSPs, contribution in the labwork and the database creation
MSc. Radana Kavková (Faculty of Science, Charles University, Prague): PhD student; magnetic properties of the sediment cores, magnetic and non-magnetic separation of MSPs and their identification using SEM
Prof. Evžen Stuchlík (Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences): co-PI of the project; co-ordination of biological analyses, µXRF and ICP-MS analyses of lake sediments, tephrochronology (volcanic glass separation, microscopic analysis and chemical identification), reconstruction of historical redox conditions (fractionation of Fe, Al, and P), separation of pyrite framboids
Dr. Zuzana Hořická (Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences): senior researcher; analysis of cladoceran remains (Crustacea: Cladocera) in the lake sediment samples, interpretation of biological results with respect to ecology of lake paleoecosystems
Dr. Nancy H. Bigelow (Alaska Quaternary Center, College of Natural Science and Mathematics, University of Alaska Fairbanks): co-ordination of the sediment sampling in Alaska lakes, pollen analyses and reconstruction of historical vegetation cover in the catchments of lakes in Alaska
MSc. Nicholas Hasson (Permafrost Laboratory, Geophysical Institute, University of Alaska Fairbanks): PhD student; biogeochemistry of thermokarst lakes, winter methane flux, very-low-frequency geophysics

Aug. 12th, 2020

A new peer reviewed popularization paper
Co způsobilo poslední vzepětí doby ledové?
written by Daniel Vondrák and Günther Kletetschka
was published in Vesmír




Apr. 8th, 2020

A new paper on

A 200 km suspected impact crater Kotuykanskaya near Popigai, Siberia, in the light of new gravity aspects from EIGEN 6C4, and other data

written by Jaroslav Klokočník, Jan Kostelecký, Aleš Bezděk,
Gunther Kletetschka and Hana Staňková

was published in Scientific Reports




Mar. 12th, 2020

Reply to comments on

Extraordinary Biomass-Burning Episode and Impact Winter Triggered by the Younger Dryas Cosmic Impact ∼12,800 Years Ago: A Reply

by Wendy S. Wolbach, Joanne P. Ballard, Paul A. Mayewski, Andrei Kurbatov, Ted E. Bunch, Malcolm A. LeCompte, Victor Adedeji, Isabel Israde-Alcántara, Richard B. Firestone, William C. Mahaney, Adrian L. Melott,Christopher R. Moore, William M. Napier, George A. Howard, Kenneth B. Tankersley, Brian C. Thomas, James H. Wittke, John R. Johnson, Siddhartha Mitra, James P. Kennett, Gunther Kletetschka, and Allen West


Mar. 9th, 2020

A new paper on

Support for two subglacial impact craters in northwest Greenland
from Earth gravity model EIGEN 6C4 and other data

written by Jaroslav Klokočník, Jan Kostelecký, Aleš Bezděk, Václav Cílek,
Gunther Kletetschka and Hana Staňková

is available in a pre-proof mode


Mar. 5th, 2020

A new paper in Scientific Reports on

Evidence of Cosmic Impact at Abu
Hureyra, Syria at the Younger Dryas
Onset (~12.8 ka): High-temperature
melting at >2200 °C.

by Andrew Moore, James P. Kennett, William M. Napier, Ted E. Bunch, James C. Weaver,
Malcolm LeCompte, A. Victor Adedeji, Paul Hackley, Gunther Kletetschka, Robert E.
Hermes, James H. Wittke, Joshua J. Razink, Michael William Gaultois, Allen West,

is available for download


Jan. 6th, 2020

Three successful project proposals will strengthen up our study of Younger Dryas causes. Look at for details.


Nov. 30th, 2019
Website going operational.

Nov. 22th, 2019
New dawn of the project in Alaska. The first meeting of the project leader Günther Kletetschka with American partners.


Nov. 20th, 2019
we started building this website, working towards the first public release


Last update: September 5, 2020
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