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A chironomid-based reconstruction of late glacial summer temperatures in the southern Carpathians (Romania)

Published online by Cambridge University Press:  20 January 2017

Mónika Tóth ,
Enikő K. Magyari ,
Stephen J. Brooks ,
Mihály Braun ,
Krisztina Buczkó ,
Miklós Bálint  and
Oliver Heiri
Mónika Tóth*
Affiliation:
Hungarian Academy of Sciences, Balaton Limnological Research Institute, Klebelsberg Kuno 3, HU-8237 Tihany, Hungary
Enikő K. Magyari
Affiliation:
HAS-NHMUS Research group for Paleontology, HU-1476 Budapest, P.O. Box 222, Hungary
Stephen J. Brooks
Affiliation:
Department of Entomology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Mihály Braun
Affiliation:
University of Debrecen, Department of Inorganic and Analytical Chemistry, HU-4010 Debrecen, P.O. Box 21, Hungary
Krisztina Buczkó
Affiliation:
Department of Botany, Hungarian Natural History Museum, HU-1476 Budapest, P.O. Box 222, Hungary
Miklós Bálint
Affiliation:
Biodiversit"t und Klima Forschungszentrum (BiK-F), Senckenberganlage 25, D-60325 Frankfurt am Main, Germany Molecular Biology Center, Babeş-Bolyai University, Treboniu Laurian 42, 400271 Cluj, Romania
Oliver Heiri
Affiliation:
Institute of Environmental Biology, Utrecht University, Budapestlaan 4, CD-3584 Utrecht, The Netherlands Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
*
*Corresponding author. E-mail address:tothmoni@tres.blki.hu (M. Tóth).
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Abstract

Late glacial and early Holocene summer temperatures were reconstructed based on fossil chironomid assemblages at Lake Brazi (Retezat Mountains) with a joint Norwegian"Swiss transfer function, providing an important addition to the late glacial quantitative climate reconstructions from Europe. The pattern of the late glacial temperature changes in Lake Brazi show both similarities and some differences from the NGRIP δ18O record and other European chironomid-based reconstructions. Our reconstruction indicates that at Lake Brazi (1740 m a.s.l.) summer air temperature increased by ~ 2.8ºC at the Oldest Dryas/Bølling transition (GS-2/GI-1) and reached 8.1–8.7ºC during the late glacial interstade. The onset of the Younger Dryas (GS-1) was characterized by a weak (< 1ºC) decrease in chironomid-inferred temperatures. Similarly, at the GS-1/Holocene transition no major changes in summer temperature were recorded. In the early Holocene, summer temperature increased in two steps and reached ~ 12.0–13.3ºC during the Preboreal. Two short-term cold events were detected during the early Holocene between 11,480–11,390 and 10,350–10,190 cal yr BP. The first cooling coincides with the Preboreal oscillation and shows a weak (0.7ºC) temperature decrease, while the second is characterized by 1ºC cooling. Both cold events coincide with cooling events in the Greenland ice core records and other European temperature reconstructions.

Keywords

Subfossil chironomidsLate glacialTemperature reconstructionTransfer functionRetezat Mountains
Type
Original Articles
Information
Quaternary Research , Volume 77 , Issue 1 , January 2012 , pp. 122 - 131
Copyright
University of Washington

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