PANGAEA_992013 GDGTs of lacustrine sediment core M4 from Mbalang Cameroon Ménot, Guillemette; Garcin, Yannick GDGTs of lacustrine sediment core M4 from Mbalang Cameroon 2026-06-29 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.992013 Investigator Guillemette Ménot guillemette.menot@ens-lyon.fr Earth Science DEPTH, sediment/rock AGE Branched glycerol dialkyl glycerol tetraether (peak area) Isoprenoid glycerol dialkyl glycerol tetraether (peak area) Crenarchaeol (peak area) Branched glycerol dialkyl glycerol tetraether, IIIa (peak area) Branched glycerol dialkyl glycerol tetraether, IIIa' (peak area) Branched glycerol dialkyl glycerol tetraether, IIIa'' (peak area) Branched glycerol dialkyl glycerol tetraether, IIIb (peak area) Branched glycerol dialkyl glycerol tetraether, IIIb' (peak area) Branched glycerol dialkyl glycerol tetraether, IIIb'' (peak area) Branched glycerol dialkyl glycerol tetraether, IIIc (peak area) Branched glycerol dialkyl glycerol tetraether, IIIc' (peak area) Branched glycerol dialkyl glycerol tetraether, IIa (peak area) Branched glycerol dialkyl glycerol tetraether, IIa' (peak area) Branched glycerol dialkyl glycerol tetraether, IIb (peak area) Branched glycerol dialkyl glycerol tetraether, IIb' (peak area) Branched glycerol dialkyl glycerol tetraether, IIc (peak area) Branched glycerol dialkyl glycerol tetraether, IIc' (peak area) Branched glycerol dialkyl glycerol tetraether, Ia (peak area) Branched glycerol dialkyl glycerol tetraether, Ib (peak area) Branched glycerol dialkyl glycerol tetraether, Ic (peak area) Isoprenoid acyclic glycerol dialkyl glycerol tetraether, fractional abundance Branched glycerol dialkyl glycerol tetraether, fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIa, fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIa', fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIa'', fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIb, fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIb', fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIb'', fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIc, fractional abundance Branched glycerol dialkyl glycerol tetraether, IIIc', fractional abundance Branched glycerol dialkyl glycerol tetraether, IIa, fractional abundance Branched glycerol dialkyl glycerol tetraether, IIa', fractional abundance Branched glycerol dialkyl glycerol tetraether, IIb, fractional abundance Branched glycerol dialkyl glycerol tetraether, IIb', fractional abundance Branched glycerol dialkyl glycerol tetraether, IIc, fractional abundance Branched glycerol dialkyl glycerol tetraether, IIc', fractional abundance Branched glycerol dialkyl glycerol tetraether, Ia, fractional abundance Branched glycerol dialkyl glycerol tetraether, Ib, fractional abundance Branched glycerol dialkyl glycerol tetraether, Ic, fractional abundance Branched and isoprenoid tetraether index Methylation index of 5-methyl branched tetraethers Isomer ratio of 6-methyl branched glycerol dialkyl glycerol tetraethers Cyclization ratio of branched tetraethers prime Cyclization ratio of branched tetraethers of 5-methyl branched glycerol dialkyl glycerol tetraether geoscientificInformation Cameroon GDGT Holocene lake Mbalang modern sediments see reference(s) High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Complete 0.252 m (DEPTH, sediment/rock) 5.669 m (DEPTH, sediment/rock) unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 1364 data points text/tab-separated-values Ménot, Guillemette; Ansanay-Alex, Salomé; Schwab, Valérie F; Todou, Gilbert; Séné, Olivier; Onana, Jean-Michel; Gleixner, Gerd; Sachse, Dirk; Garcin, Yannick (2025): Mid- to Late-Holocene branched GDGT-based air temperatures from a crater lake in Cameroon (Central Africa). Organic Geochemistry, 204, 104982, https://doi.org/10.1016/j.orggeochem.2025.104982

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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.992013"!

http://en.wikipedia.org/wiki/Kyr AGE https://doi.org/10.1016/j.orggeochem.2025.104982 Mid- to Late-Holocene branched GDGT-based air temperatures from a crater lake in Cameroon (Central Africa) DIF 9.4 2026-06-29 2026-06-29