Temperature and nutrients control the presence and distribution of long-chain diols in Swiss lakes DOI Creative Commons
Julie Lattaud, Céline Martin, Ronald Lloren

et al.

Frontiers in Earth Science, Journal Year: 2024, Volume and Issue: 12

Published: June 3, 2024

Long-chain diols are biomarkers commonly used in the marine realm to reconstruct several environmental parameters such as sea surface temperature and salinity. However, they also produced lacustrine slow-flowing river environments, a characteristic that has proved be useful trace past riverine inputs coastal sedimentary records. So far, their use settings is sparse controls not well-known. Previous studies two lakes have shown long-chain diol distribution linked changes (in small Spanish alpine lake), but water column stratification large deep Swiss lake). To understand on i) presence of lakes, ii) isomers, sediments from 52 were studied. present 57% machine learning (i.e., random forest model) showed mainly controlled by mean annual air temperature, sodium potassium concentrations area lakes. isomer relative seems react nutrient (here nitrate) oxygen This new insight was tested short core Lake Zurich, compared with other biomarker proxies (based branched isoprenoid glycerol dialkyl tetraethers), well historical record contents temperature. Variations index (LDI) mirror measured reacted nutrients oxygenation lake. study highlights potential proxy both potentially geological timescales.

Language: Английский

The Branched GDGT Isomer Ratio Refines Lacustrine Paleotemperature Estimates DOI Creative Commons
Joseph B. Novak,

James M. Russell,

Emma R. Lindemuth

et al.

Geochemistry Geophysics Geosystems, Journal Year: 2025, Volume and Issue: 26(3)

Published: March 1, 2025

Abstract Branched glycerol dialkyl tetraethers (brGDGTs) are membrane‐spanning lipids synthesized by bacteria in numerous substrates. The degree of methylation the five methyl brGDGTs both soils and lake sediments, described MBT′ 5Me index, is empirically related to surface atmospheric temperature. This relationship lakes generally assumed reflect temperatures captured brGDGT production water column exported index has been applied sediment successions reconstruct changes temperature through time. We analyzed between isomerization (IR 6Me ) globally distributed surficial sediments demonstrated that relationship, calibrations, middle high latitude sensitive incompletely understood factors IR . does not appear track a non‐thermal influence tropical lakes, but this could change as data set expanded. address ongoing challenges application paleothermometer with new ‐temperature calibrations based on grouping demonstrate how can distinguish samples significant targeting anomalously warm during Last Glacial Maximum from newly piston gravity core Lake Baikal, Russia.

Language: Английский

Citations

0
A novel method to advance the brGDGTs-based paleoclimate reconstruction applicable to different terrestrial environments DOI

Liping Tian,

Mengyuan Wang, Cong Chen

et al.

Quaternary Science Reviews, Journal Year: 2024, Volume and Issue: 328, P. 108540 - 108540

Published: Feb. 14, 2024

Language: Английский

Citations

3
Holocene seasonal temperature reconstruction based on branched glycerol dialkyl glycerol tetraethers (brGDGTs) records from different regions in China DOI
Wubiao Li, Wenchao Zhang, Yujie Wang

et al.

The Holocene, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

The patterns of Holocene temperature change can provide important insight for understanding the recent global warming and assessing future climate change. However, mismatch in mean annual between proxy records models remains controversial, which is likely caused by potential seasonal bias from geological records. Here, 64 surface sediment samples are analyzed to examine brGDGTs reconstruction. Subsequently, we compile 23 brGDGT-based different regions China compare them with TraCE-21 ka simulation results same geographical location. linearly analysis shows a higher correlation MBT′ 5me MAF (mean months above freezing) than that MAT air temperatures), suggesting reconstructed based on aquatic sources may be biased toward MAF. regionally stacked indicate Qinghai-Tibet Plateau Northern warmed ~12 7 BP then cooled thereafter, while an overall trend occurred Southern China. These well reproduced model simulations. summer autumn during primarily driven local insolation modulated ice sheets greenhouse gas concentrations. retreat early middle Holocene, coupled increase gases, considered main driving factor long-term southern China, whereas orbital-induced might major Plateau. Our suggest basically matched Holocene.

Language: Английский

Citations

1
Discrepancies in lacustrine bacterial lipid temperature reconstructions explained by microbial ecology DOI Creative Commons
Jie Liang, Manuel Chevalier, Keshao Liu

et al.

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: Dec. 5, 2024

Abstract Bacterial lipid branched glycerol dialkyl tetraethers (brGDGTs) are a valuable tool for reconstructing past temperatures. However, gap remains regarding the influence of bacterial communities on brGDGT profiles. Here, we identified two distinct patterns brGDGTs from surface sediments 38 Tibetan Plateau lakes using an unsupervised clustering technique. Further investigation revealed that salinity and pH significantly change community composition, affecting profiles causing brGDGT-based temperatures to be overestimated by up 2.7 ± 0.7 °C in haloalkaline environments. We subsequently used trained model examine assemblages global lacustrine dataset, confirming applicability our approach. finally applied approach Holocene records Plateau, showing shifts clusters amplified temperature variations over timescales. Our findings demonstrate microbial ecology can robustly diagnose constrain site-specific discrepancies reconstruction.

Language: Английский

Citations

1
Alternating Dry-Rewetting Environment in Paddy Soil Has Limited Impact On Brgdgt Indices DOI

Xueqing Feng,

Fuyun Gao,

Jiantao Xue

et al.

Published: Jan. 1, 2024

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Language: Английский

Citations

0
Temperature and nutrients control the presence and distribution of long-chain diols in Swiss lakes DOI Creative Commons
Julie Lattaud, Céline Martin, Ronald Lloren

et al.

Frontiers in Earth Science, Journal Year: 2024, Volume and Issue: 12

Published: June 3, 2024

Long-chain diols are biomarkers commonly used in the marine realm to reconstruct several environmental parameters such as sea surface temperature and salinity. However, they also produced lacustrine slow-flowing river environments, a characteristic that has proved be useful trace past riverine inputs coastal sedimentary records. So far, their use settings is sparse controls not well-known. Previous studies two lakes have shown long-chain diol distribution linked changes (in small Spanish alpine lake), but water column stratification large deep Swiss lake). To understand on i) presence of lakes, ii) isomers, sediments from 52 were studied. present 57% machine learning (i.e., random forest model) showed mainly controlled by mean annual air temperature, sodium potassium concentrations area lakes. isomer relative seems react nutrient (here nitrate) oxygen This new insight was tested short core Lake Zurich, compared with other biomarker proxies (based branched isoprenoid glycerol dialkyl tetraethers), well historical record contents temperature. Variations index (LDI) mirror measured reacted nutrients oxygenation lake. study highlights potential proxy both potentially geological timescales.

Language: Английский

Citations

0