Lipid biomarker (brGDGT)- and pollen-based reconstruction of temperature change during the Middle to Late Holocene transition in the Carpathians

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Ramos-Roman , M J , De Jonge , C , Magyari , E , Veres , D , Ilvonen , L , Develle , A-L & Seppä , H 2022 , ' Lipid biomarker (brGDGT)- and pollen-based reconstruction of temperature change during the Middle to Late Holocene transition in the Carpathians ' , Global and Planetary Change , vol. 215 , 103859 . https://doi.org/10.1016/j.gloplacha.2022.103859

Title: Lipid biomarker (brGDGT)- and pollen-based reconstruction of temperature change during the Middle to Late Holocene transition in the Carpathians
Author: Ramos-Roman, Maria J.; De Jonge, Cindy; Magyari, Eniko; Veres, Daniel; Ilvonen, Liisa; Develle, Anne-Lise; Seppä, Heikki
Contributor organization: University of Helsinki
Department of Geosciences and Geography
Environmental and Ecological Statistics Group
Organismal and Evolutionary Biology Research Programme
Date: 2022-08
Language: eng
Number of pages: 13
Belongs to series: Global and Planetary Change
ISSN: 0921-8181
DOI: https://doi.org/10.1016/j.gloplacha.2022.103859
URI: http://hdl.handle.net/10138/346707
Abstract: To reconstruct changes in vegetation, temperature, and sediment geochemistry through the last 6.5 cal ka BP, in the Subcarpathian belt of the Eastern Carpathians (Romania), pollen, branched glycerol dialkyl glycerol tetraethers (brGDGTs) and X-ray fluorescence analyses have been integrated. Pollen and brGDGTs (a bacterial lipid biomarker proxy) are used as paleothermometers for reconstructing the mean annual air temperature (MAAT) and mean temperature above freezing (MAF), respectively. Both proxies show roughly consistent records. The highest MAAT and MAF occurs during the oldest part of the record (from 6.5 to 4.2 cal ka BP), and the Middle to the Late Holocene shift is marked by a prominent decrease in temperature between 5.4 and 4.2 cal ka BP, coinciding with Bond event 4 and 3. This transition is coeval with a decrease in summer insolation, shift from consistent NAO-conditions to a predominance of NAO+ phase and coincides with the beginning of the Neoglacial cooling in northern latitudes. The warm bias in the MAF reconstruction during the Late Holocene is explained as a change in the lipid provenance or in the composition of the brGDGT producers after 4.2 cal ka BP.
Subject: brGDGT
Temperature reconstruction
Lipid biomarkers
Holocene
Eastern Europe
DIALKYL GLYCEROL TETRAETHERS
MEDITERRANEAN REGION
ROMANIAN CARPATHIANS
VEGETATION HISTORY
2 SEQUENCES
CLIMATE
LAKE
MARINE
PALEOCLIMATE
RECORD
1172 Environmental sciences
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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