Chironomid-inferred Holocene temperature changes in the South Carpathians (Romania)

Mónika Tóth, E. Magyari, Krisztina Buczkó, M. Braun, Konstantinos Panagiotopoulos, Oliver Heiri

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We present a Holocene summer air temperature reconstruction based on fossil chironomids from Lake Brazi (1740 m.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. 11,500–10,200 cal. yr BP), reaching close to present July air temperatures (~11.2°C). Between ca. 10,200 and 8500 cal. yr BP mean reconstructed temperatures increased further by 1.5–2.0°C. Later on, from ca. 8500 cal. yr BP, chironomid-based summer temperatures started to decrease, although mean values were still above present-day temperatures. The next time period (ca. 6000–3000 cal. yr BP) was cooler and with less variable temperature conditions than earlier. Afterwards (ca. 3000–2000 cal. yr BP), a sharp decrease occurred in inferred temperatures with values under present-day conditions by 1.8°C. Finally, in the last 2000 years, reconstructed temperatures showed again an increasing trend at Lake Brazi. Short-term temperature declines of 0.6–1.2°C were observed between ca. 10,350–10,190, 9750–9500, 8700–8500, 7600–7300, 7100–6900 and 4400–4000 cal. 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°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.

Original languageEnglish
Pages (from-to)569-582
Number of pages14
JournalHolocene
Volume25
Issue number4
DOIs
Publication statusPublished - Apr 16 2015

Fingerprint

Holocene
temperature
air temperature
summer
lake
Romania
Temperature
insolation
transfer function
diatom
pollen
fossil
calibration
mountain
prediction
Summer
sediment
Air

Keywords

  • Chironomidae
  • Holocene
  • palaeolimnology
  • Retezat Mountains
  • temperature reconstruction

ASJC Scopus subject areas

  • Archaeology
  • Earth-Surface Processes
  • Global and Planetary Change
  • Ecology
  • Palaeontology

Cite this

Chironomid-inferred Holocene temperature changes in the South Carpathians (Romania). / Tóth, Mónika; Magyari, E.; Buczkó, Krisztina; Braun, M.; Panagiotopoulos, Konstantinos; Heiri, Oliver.

In: Holocene, Vol. 25, No. 4, 16.04.2015, p. 569-582.

Research output: Contribution to journalArticle

Tóth, Mónika ; Magyari, E. ; Buczkó, Krisztina ; Braun, M. ; Panagiotopoulos, Konstantinos ; Heiri, Oliver. / Chironomid-inferred Holocene temperature changes in the South Carpathians (Romania). In: Holocene. 2015 ; Vol. 25, No. 4. pp. 569-582.
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AU - Panagiotopoulos, Konstantinos

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AB - We present a Holocene summer air temperature reconstruction based on fossil chironomids from Lake Brazi (1740 m.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. 11,500–10,200 cal. yr BP), reaching close to present July air temperatures (~11.2°C). Between ca. 10,200 and 8500 cal. yr BP mean reconstructed temperatures increased further by 1.5–2.0°C. Later on, from ca. 8500 cal. yr BP, chironomid-based summer temperatures started to decrease, although mean values were still above present-day temperatures. The next time period (ca. 6000–3000 cal. yr BP) was cooler and with less variable temperature conditions than earlier. Afterwards (ca. 3000–2000 cal. yr BP), a sharp decrease occurred in inferred temperatures with values under present-day conditions by 1.8°C. Finally, in the last 2000 years, reconstructed temperatures showed again an increasing trend at Lake Brazi. Short-term temperature declines of 0.6–1.2°C were observed between ca. 10,350–10,190, 9750–9500, 8700–8500, 7600–7300, 7100–6900 and 4400–4000 cal. 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°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.

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