Universität zu Köln

Toth, Monika, Magyari, Eniko K., Buczko, Krisztina ORCID: 0000-0001-9377-8847, Braun, Mihaly, Panagiotopoulos, Konstantinos ORCID: 0000-0002-3158-7962 and Heiri, Oliver ORCID: 0000-0002-3957-5835 (2015). Chironomid-inferred Holocene temperature changes in the South Carpathians (Romania). Holocene, 25 (4). S. 569 - 583. LONDON: SAGE PUBLICATIONS LTD. ISSN 1477-0911

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Abstract

We present a Holocene summer air temperature reconstruction based on fossil chironomids from Lake Brazi (1740m.a.s.l.), a shallow mountain lake in the South Carpathians. Summer air temperature reconstruction was performed using transfer functions based on the Swiss (Sw-TF) and the merged Norwegian-Swiss calibration data set (NS-TF). Our results suggest that summer air temperatures increased rapidly from the onset of the early Holocene onwards (ca. 11,500-10,200cal. yr BP), reaching close to present July air temperatures (11.2 degrees C). Between ca. 10,200 and 8500cal. yr BP mean reconstructed temperatures increased further by 1.5-2.0 degrees C. Later on, from ca. 8500cal. yr BP, chironomid-based summer temperatures started to decrease, although mean values were still above present-day temperatures. The next time period (ca. 6000-3000cal. yr BP) was cooler and with less variable temperature conditions than earlier. Afterwards (ca. 3000-2000cal. yr BP), a sharp decrease occurred in inferred temperatures with values under present-day conditions by 1.8 degrees C. Finally, in the last 2000years, reconstructed temperatures showed again an increasing trend at Lake Brazi. Short-term temperature declines of 0.6-1.2 degrees C were observed between ca. 10,350-10,190, 9750-9500, 8700-8500, 7600-7300, 7100-6900 and 4400-4000cal. yr BP. These temperature declines are, however, within the estimated error of prediction of the chironomid-based inferences. Generally, our reconstructed temperatures complied with the summer insolation curve at 45 degrees N, with other proxy-records (i.e. pollen and diatoms) from the same sediment and with other records from the Carpathians and from Western Europe.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Toth, Monika UNSPECIFIED UNSPECIFIED UNSPECIFIED Magyari, Eniko K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buczko, Krisztina UNSPECIFIED orcid.org/0000-0001-9377-8847 UNSPECIFIED Braun, Mihaly UNSPECIFIED UNSPECIFIED UNSPECIFIED Panagiotopoulos, Konstantinos UNSPECIFIED orcid.org/0000-0002-3158-7962 UNSPECIFIED Heiri, Oliver UNSPECIFIED orcid.org/0000-0002-3957-5835 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-409005
DOI:	10.1177/0959683614565953
Journal or Publication Title:	Holocene
Volume:	25
Number:	4
Page Range:	S. 569 - 583
Date:	2015
Publisher:	SAGE PUBLICATIONS LTD
Place of Publication:	LONDON
ISSN:	1477-0911
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CLIMATE-CHANGE; SWISS ALPS; SUMMER TEMPERATURES; VEGETATION RESPONSE; AIR TEMPERATURES; EASTERN-EUROPE; ALPINE LAKES; RECONSTRUCTION; ASSEMBLAGES; VARIABILITY Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/40900