de.pangaea.dataset992013 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-06-29T06:12:27Z https://doi.pangaea.de/10.1594/PANGAEA.992013 2026-06-29T06:12:26 publication Ménot, Guillemette

guillemette.menot@ens-lyon.fr

https://orcid.org/0000-0003-2423-8294 information author Garcin, Yannick

garcin@cerege.fr

https://orcid.org/0000-0001-8205-494X information author PANGAEA

info@pangaea.de

https://www.pangaea.de/ information publisher tableDigital This file contains the biomarker data from the paper Ménot et al., 2025 Organic Geochemistry (https://doi.org/10.1016/j.orggeochem.2025.104982). African low-latitude regions tend to be underrepresented in global continental temperature reconstructions, limiting both our understanding and the reliability of predictions of past and future changes in temperature and precipitation in those parts of the world. The lack of continuous sedimentary archives and quantitative temperature proxies further complicates this issue, especially outside Eastern Africa. Here, we use data collected in Cameroon lakes to assess branched glycerol dialkyl glycerol tetraether (brGDGT)-based temperature proxies and examine potential confounding variables impacting temperature reconstructions. By analyzing GDGT distributions in soil watershed, water column, and surface sediment samples from a total of 11 Cameroon lakes, we could verify that the degree of methylation of brGDGTs (through the MBT′5Me) can serve as a reliable indicator for reconstructing mean annual air temperatures. Additionally, we could confirm that surface water conductivity represents a controlling factor for the brGDGT assemblage in surface sediments of crater lakes. Moreover, we provide the first reconstruction of Mid- to Late-Holocene GDGT-based air temperatures for a crater lake in Cameroon (Central Africa), revealing a temperature decrease of 2.5 °C over the last 7000 years, which agrees with recently published records for East Africa but exceeds current model predictions. These discrepancies highlight the need for additional studies to focus on this geographically underrepresented area. completed Ménot, Guillemette

guillemette.menot@ens-lyon.fr

https://orcid.org/0000-0003-2423-8294 information principalInvestigator Cameroon GDGT Holocene lake Mbalang modern sediments theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation 0.252 5.669 DEPTH, sediment/rock physicalMeasurement see reference(s) m m AGE physicalMeasurement see reference(s) ka BP ka BP Branched glycerol dialkyl glycerol tetraether (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200; sum Isoprenoid glycerol dialkyl glycerol tetraether (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200; sum Crenarchaeol (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIa (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIa' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIa'' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIb (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIb' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIb'' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIc (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIc' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIa (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIa' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIb (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIb' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIc (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIc' (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, Ia (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, Ib (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, Ic (peak area) thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Isoprenoid acyclic glycerol dialkyl glycerol tetraether, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200; total Branched glycerol dialkyl glycerol tetraether, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200; total Branched glycerol dialkyl glycerol tetraether, IIIa, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIa', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIa'', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIb, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIb', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIb'', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIc, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIIc', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIa, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIa', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIb, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIb', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIc, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, IIc', fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, Ia, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, Ib, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched glycerol dialkyl glycerol tetraether, Ic, fractional abundance thematicClassification High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Branched and isoprenoid tetraether index thematicClassification see reference(s) Methylation index of 5-methyl branched tetraethers thematicClassification see reference(s) Isomer ratio of 6-methyl branched glycerol dialkyl glycerol tetraethers thematicClassification see reference(s) Cyclization ratio of branched tetraethers prime thematicClassification see reference(s) Cyclization ratio of branched tetraethers of 5-methyl branched glycerol dialkyl glycerol tetraether thematicClassification see reference(s) text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.992013?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. Related to 2025-01-01 publication https://doi.org/10.1016/j.orggeochem.2025.104982 Ménot, Guillemette

guillemette.menot@ens-lyon.fr

https://orcid.org/0000-0003-2423-8294 information author Ansanay-Alex, Salomé author Schwab, Valérie F author Todou, Gilbert author Séné, Olivier author Onana, Jean-Michel author Gleixner, Gerd https://orcid.org/0000-0002-4616-0953 information author Sachse, Dirk

dirk.sachse@gfz-potsdam.de

https://orcid.org/0000-0003-4207-0309 information author Garcin, Yannick

garcin@cerege.fr

https://orcid.org/0000-0001-8205-494X information author documentDigital Organic Geochemistry 204 104982