Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 École Normale Supérieure de Lyon ENS de Lyon https://ror.org/04zmssz18 Garcin Yannick garcin@cerege.fr 0000-0001-8205-494X French National Research Institute for Sustainable Development IRD http://www.ird.fr https://ror.org/05q3vnk25 2026 GDGTs of lacustrine sediment core M4 from Mbalang Cameroon dataset https://doi.pangaea.de/10.1594/PANGAEA.992013 2026-06-29T06:12:26 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. Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 Ansanay-Alex Salomé Schwab Valérie F Todou Gilbert Séné Olivier Onana Jean-Michel Gleixner Gerd 0000-0002-4616-0953 Sachse Dirk dirk.sachse@gfz-potsdam.de 0000-0003-4207-0309 Garcin Yannick garcin@cerege.fr 0000-0001-8205-494X 2025 Mid- to Late-Holocene branched GDGT-based air temperatures from a crater lake in Cameroon (Central Africa) journal article Organic Geochemistry 204 https://doi.org/10.1016/j.orggeochem.2025.104982 104982 0.252 5.669 Agence Nationale de la Recherche ANR https://anr.fr/en/anrs-role-in-research/about-us/missions/ https://doi.org/10.13039/501100001665 ANR-18-CE01-0005 ANR TAPIOCA German Research Foundation DFG http://www.dfg.de/en/ https://doi.org/10.13039/501100001659 160487544 1364 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ DEPTH, sediment/rock Depth sed m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock Length L http://dbpedia.org/resource/Length see reference(s) Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 Depth sed [m] AGE Age ka BP http://en.wikipedia.org/wiki/Kyr age http://purl.obolibrary.org/obo/PATO_0000011 Time T http://dbpedia.org/resource/Time see reference(s) Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 Age [ka BP] Branched glycerol dialkyl glycerol tetraether (peak area) brGDGT peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 sum brGDGT peak area Isoprenoid glycerol dialkyl glycerol tetraether (peak area) iso GDGT peak area isoprenoid glycerol dialkyl glycerol tetraether isoGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 sum iso GDGT peak area Crenarchaeol (peak area) Cren peak area crenarchaeol peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 Cren peak area Branched glycerol dialkyl glycerol tetraether, IIIa (peak area) brGDGT IIIa peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIa peak area Branched glycerol dialkyl glycerol tetraether, IIIa' (peak area) brGDGT IIIa' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIa' peak area Branched glycerol dialkyl glycerol tetraether, IIIa'' (peak area) brGDGT IIIa'' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIa'' peak area Branched glycerol dialkyl glycerol tetraether, IIIb (peak area) brGDGT IIIb peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIb peak area Branched glycerol dialkyl glycerol tetraether, IIIb' (peak area) brGDGT IIIb' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIb' peak area Branched glycerol dialkyl glycerol tetraether, IIIb'' (peak area) brGDGT IIIb'' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIb'' peak area Branched glycerol dialkyl glycerol tetraether, IIIc (peak area) brGDGT IIIc peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIc peak area Branched glycerol dialkyl glycerol tetraether, IIIc' (peak area) brGDGT IIIc' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIc' peak area Branched glycerol dialkyl glycerol tetraether, IIa (peak area) brGDGT IIa peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIa peak area Branched glycerol dialkyl glycerol tetraether, IIa' (peak area) brGDGT IIa' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIa' peak area Branched glycerol dialkyl glycerol tetraether, IIb (peak area) brGDGT IIb peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIb peak area Branched glycerol dialkyl glycerol tetraether, IIb' (peak area) brGDGT IIb' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIb' peak area Branched glycerol dialkyl glycerol tetraether, IIc (peak area) brGDGT IIc peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIc peak area Branched glycerol dialkyl glycerol tetraether, IIc' (peak area) brGDGT IIc' peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIc' peak area Branched glycerol dialkyl glycerol tetraether, Ia (peak area) brGDGT Ia peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT Ia peak area Branched glycerol dialkyl glycerol tetraether, Ib (peak area) brGDGT Ib peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT Ib peak area Branched glycerol dialkyl glycerol tetraether, Ic (peak area) brGDGT Ic peak area branched glycerol dialkyl glycerol tetraether brGDGT peak area High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT Ic peak area Isoprenoid acyclic glycerol dialkyl glycerol tetraether, fractional abundance iso GDGT-0 fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 total iso GDGT-0 Branched glycerol dialkyl glycerol tetraether, fractional abundance brGDGT branched glycerol dialkyl glycerol tetraether brGDGT High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 total brGDGT Branched glycerol dialkyl glycerol tetraether, IIIa, fractional abundance brGDGT IIIa branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIa Branched glycerol dialkyl glycerol tetraether, IIIa', fractional abundance brGDGT IIIa' branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIa' Branched glycerol dialkyl glycerol tetraether, IIIa'', fractional abundance brGDGT IIIa'' branched glycerol dialkyl glycerol tetraether brGDGT High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIa'' Branched glycerol dialkyl glycerol tetraether, IIIb, fractional abundance brGDGT IIIb branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIb Branched glycerol dialkyl glycerol tetraether, IIIb', fractional abundance brGDGT IIIb' branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIb' Branched glycerol dialkyl glycerol tetraether, IIIb'', fractional abundance brGDGT IIIb'' branched glycerol dialkyl glycerol tetraether brGDGT High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIb'' Branched glycerol dialkyl glycerol tetraether, IIIc, fractional abundance brGDGT IIIc branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIc Branched glycerol dialkyl glycerol tetraether, IIIc', fractional abundance brGDGT IIIc' branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIIc' Branched glycerol dialkyl glycerol tetraether, IIa, fractional abundance brGDGT IIa branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIa Branched glycerol dialkyl glycerol tetraether, IIa', fractional abundance brGDGT IIa' branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIa' Branched glycerol dialkyl glycerol tetraether, IIb, fractional abundance brGDGT IIb branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIb Branched glycerol dialkyl glycerol tetraether, IIb', fractional abundance brGDGT IIb' branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIb' Branched glycerol dialkyl glycerol tetraether, IIc, fractional abundance brGDGT IIc branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIc Branched glycerol dialkyl glycerol tetraether, IIc', fractional abundance brGDGT IIc' branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT IIc' Branched glycerol dialkyl glycerol tetraether, Ia, fractional abundance brGDGT Ia branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT Ia Branched glycerol dialkyl glycerol tetraether, Ib, fractional abundance brGDGT Ib branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT Ib Branched glycerol dialkyl glycerol tetraether, Ic, fractional abundance brGDGT Ic branched glycerol dialkyl glycerol tetraether brGDGT fractional abundance High Performance Liquid Chromatography Mass Spectrometry (HPLC-APCI-MS), Agilent 1200 Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 brGDGT Ic Branched and isoprenoid tetraether index BIT branched http://purl.obolibrary.org/obo/PATO_0000402 see reference(s) Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 BIT Methylation index of 5-methyl branched tetraethers MBT'5ME see reference(s) Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 MBT'5ME Isomer ratio of 6-methyl branched glycerol dialkyl glycerol tetraethers IR6me isomer ratio see reference(s) Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 IR6me Cyclization ratio of branched tetraethers prime CBT' ratio see reference(s) Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 CBT' Cyclization ratio of branched tetraethers of 5-methyl branched glycerol dialkyl glycerol tetraether CBT5ME ratio see reference(s) Ménot Guillemette guillemette.menot@ens-lyon.fr 0000-0003-2423-8294 CBT5ME CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels Cameroon GDGT Holocene lake Mbalang modern sediments author34250 author47035 author51388 author58583 author58584 author58591 author58592 author58593 author87829 award2716 award4829 curlevel30 funder20472 funder20787 geocode1 geocode2205 inst12536 inst22025 journal12339 license21 method174 method18770 param159429 param159430 param160828 param160836 param169091 param169099 param169100 param169101 param169102 param169103 param169747 param169748 param169750 param170455 param170456 param170457 param170458 param170459 param170460 param170461 param170462 param170463 param170464 param170465 param170466 param170467 param170468 param170469 param170470 param170471 param170472 param170473 param170474 param170475 param170476 param523333 param523384 param539218 param539219 param551049 param553500 param555123 param555124 param81976 pi51388 ref137907 term1073131 term1073135 term1074171 term2663825 term37911 term37912 term38263 term38481 term390 term39114 term39997 term41056 term43863 term43975 term48400 term49895 term77180 term77181 term77182