{"id":13945,"date":"2023-01-09T23:50:27","date_gmt":"2023-01-09T22:50:27","guid":{"rendered":"https:\/\/www.cerege.fr\/?page_id=13945"},"modified":"2023-01-12T10:29:55","modified_gmt":"2023-01-12T09:29:55","slug":"applications-of-lunite-of-organic-geochemistry","status":"publish","type":"page","link":"https:\/\/www.cerege.fr\/en\/equipements\/poles-techniques\/geochimie-organique-inorganique-et-isotopique-2\/unite-de-geochimie-organique\/applications-de-lunite-de-geochimie-organique\/","title":{"rendered":"Applications of the organic geochemistry unit"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"13945\" class=\"elementor elementor-13945\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-32e20cf9 elementor-section-full_width elementor-section-height-min-height elementor-section-height-default elementor-section-items-middle\" data-id=\"32e20cf9\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-59da82a8\" data-id=\"59da82a8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-176e66c5 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"176e66c5\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-392d3fd3\" data-id=\"392d3fd3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5c5ffbe6 elementor-widget elementor-widget-shortcode\" data-id=\"5c5ffbe6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><nav aria-label=\"breadcrumbs\">\n            <div class=\"breadcrumb-container theme1\">\n                <ol>\n                                    <\/ol>\n            <\/div>\n        <\/nav>    <script type=\"application\/ld+json\">\n        {\n            \"@context\": \"http:\/\/schema.org\",\n            \"@type\": \"BreadcrumbList\",\n            \"itemListElement\": [\n                            ]\n        }\n    <\/script>\n   \n    <script>\n            <\/script>\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4b26ca54 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4b26ca54\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-82458d3\" data-id=\"82458d3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-ee7ac\" data-id=\"ee7ac\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6dfa2f07 elementor-widget elementor-widget-heading\" data-id=\"6dfa2f07\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Indicateurs pal\u00e9oclimatiques mol\u00e9culaires<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3d26616e elementor-widget elementor-widget-text-editor\" data-id=\"3d26616e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le nombre de doubles liaisons de la cha\u00eene carbon\u00e9e des alc\u00e8nones, des mol\u00e9cules produites par les coccolithophorid\u00e9s du phytoplancton, d\u00e9pend de la temp\u00e9rature de l\u2019eau de surface de l\u2019oc\u00e9an (index d\u2019insaturation UK37&#8242;). De fa\u00e7on similaire les lipides t\u00e9tra\u00e9thers (GDGTs) synth\u00e9tis\u00e9s par des arch\u00e9es et des bact\u00e9ries permettent de calculer des indices contr\u00f4l\u00e9s par des facteurs pal\u00e9oclimatiques (TEX86, MBT, CBT, RI-OH). L\u2019unit\u00e9 de g\u00e9ochimie organique a particip\u00e9 avec succ\u00e8s \u00e0 des intercomparaisons internationales des analyses de ces proxies climatiques mesur\u00e9s par GC et GC-MS pour les alc\u00e8nones (Rosell-Mel\u00e9 et al. 2001) et par HPLC-MS pour les t\u00e9tra\u00e9thers (Schouten et al. 2009).\u00a0<\/p><p>Depuis 1993, nous avons publi\u00e9 de nombreuses s\u00e9ries de pal\u00e9otemp\u00e9rature pour des archives s\u00e9dimentaires provenant de sites marins et continentaux (Rostek et al. 1993, 1994, 1997, Bard et al. 1997, 1999, 2000, 2001, 2004, 2006, 2009, Sonzogni et al. 1997, 1998, Rosell-Mel\u00e9 et al. 1998, 2004, Cayre &amp; Bard 1999, Pailler &amp; Bard 2002, Sicre et al. 2002, Leduc et al. 2007, de Garidel-Thoron et al. 2007, Waelbroeck et al. 2009, Saher et al. 2009, Naughton et al. 2009, Vidal et al. 2010, Sepulcre et al. 2011, Soulet et al. 2011, M\u00e9not &amp; Bard 2012, Sanchez-Goni et al. 2013, Sanchi et al. 2013, 2014, Wegwerth et al. 2014, 2015, Darfeuil et al. 2016, Davtian et al. 2016, 2018, 2019, 2021, Martin et al. 2019, 2020, Rodriguez-Zorro et al., 2020, 2022).<\/p><p>En parall\u00e8le \u00e0 la pal\u00e9othermom\u00e9trie, les analyses mol\u00e9culaires nous renseignent sur de nombreux autres param\u00e8tres de l\u2019environnement. Par exemple, les concentrations des s\u00e9diments en alc\u00e8nones, st\u00e9rols et t\u00e9tra\u00e9thers sont des indicateurs de la productivit\u00e9 biologique marine (Rostek et al. 1994, 1997, Schulte et al. 1999, Budziak et al. 2000, Pailler et Bard 2002, Pailler et al. 2002, Schulte et Bard, 2003, Rickaby et al. 2007, Bard et Rickaby, 2009, Vidal et al., 2010). L\u2019apport d\u2019eau douce provenant de la fonte d\u2019icebergs et les conditions marines d\u00e9sal\u00e9es sont \u00e9tudi\u00e9es gr\u00e2ce aux alc\u00e8nones t\u00e9tra-insatur\u00e9es (Bard et al. 2000, Sicre et al. 2002, M\u00e9not et al. 2006). Le lycopane est un traceur des conditions d\u2019oxyg\u00e9nation de la colonne d\u2019eau (Schulte et al. 1999) alors que le diplopt\u00e9rol et le diplopt\u00e8ne sont des marqeurs de la d\u00e9stabilisation des hydrates de m\u00e9thane s\u00e9dimentaires (M\u00e9not &amp; Bard 2010).<\/p><p>Dans les s\u00e9diments estuariens et des marges continentales, les indices BIT et IIIa\/IIa des t\u00e9tra\u00e9thers GDGTs sont li\u00e9s aux apports fluviatiles terrig\u00e8nes (M\u00e9not et al. 2006, Soulet et al. 2013, Davtian et al. 2019,\u00a0M\u00e9not et al. 2020). De fa\u00e7on similaire, les abondances en n-alcanes et n-alcanones sont li\u00e9es aux apports terrig\u00e8nes de mati\u00e8res v\u00e9g\u00e9tales et leurs rapports mol\u00e9culaire (ACL, CPI) renseignent sur les types de plantes et la pr\u00e9servation de la mati\u00e8re organique (Rostek &amp; Bard 2013, Soulet et al. 2013, Shumilovskikh et al., 2016, Rodr\u00edguez-Zorro et al., 2020, Rodr\u00edguez-Zorro et al., 2022). Les t\u00e9tra\u00e9thers continentaux sont aussi des marqueurs de l\u2019acidit\u00e9 des sols (Sanchi et al. 2015, Davtian et al. 2016).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-17c94af9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"17c94af9\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-697a60f3\" data-id=\"697a60f3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-5e950a5b\" data-id=\"5e950a5b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-241fba45 elementor-widget elementor-widget-heading\" data-id=\"241fba45\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Purification mol\u00e9culaire pr\u00e9alable aux analyses isotopiques 14C, 13C\/12C et D\/H<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-73b28a5 elementor-widget elementor-widget-text-editor\" data-id=\"73b28a5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Nous d\u00e9veloppons une m\u00e9thode simple et robuste pour purifier des alc\u00e8nones par chromatographie en phase liquide pr\u00e9parative (outil n\u00b08) pr\u00e9alable \u00e0 l\u2019analyse de leur \u00e2ge <sup>14<\/sup>C gr\u00e2ce \u00e0 la source d\u2019ions \u00e0 CO<sub>2<\/sub> gazeux d\u2019AixMICADAS coupl\u00e9e \u00e0 un analyseur \u00e9l\u00e9mentaire. Ces mol\u00e9cules organiques synth\u00e9tis\u00e9es par le plancton sont couramment utilis\u00e9es en pal\u00e9othermom\u00e9trie et leur datation <sup>14<\/sup>C permet de v\u00e9rifier leur origine et de mieux dater les enregistrements de temp\u00e9rature en comparant avec les dates <sup>14<\/sup>C mesur\u00e9es sur les carbonates (foraminif\u00e8res). La m\u00e9thode d\u00e9velopp\u00e9e est bas\u00e9e sur la purification de l\u2019extrait lipidique par des extractions en phase solide suivies de la s\u00e9paration et de la collecte des alc\u00e8nones par HPLC-prep. La puret\u00e9 des fractions est v\u00e9rifi\u00e9e par HPLC-MS et par GC-FID et GC-MS. D\u2019autres compos\u00e9s mol\u00e9culaires sont envisag\u00e9s pour dater certains s\u00e9diments pauvres en alc\u00e8nones. Le m\u00eame syst\u00e8me est aussi utilis\u00e9 pour purifier les alc\u00e8nones pr\u00e9alablement \u00e0 leurs analyses isotopiques <sup>13<\/sup>C\/<sup>12<\/sup>C et D\/H dans le cadre du projet ANR Isobioclim pilot\u00e9 par Guillaume Leduc.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-26427c8c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"26427c8c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-46781a6\" data-id=\"46781a6\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-3dc46dd0\" data-id=\"3dc46dd0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5a118d98 elementor-widget elementor-widget-heading\" data-id=\"5a118d98\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">S\u00e9paration de l\u2019hydroxyproline du collag\u00e8ne pr\u00e9alablement \u00e0 la datation radiocarbone\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4cbb6481 elementor-widget elementor-widget-text-editor\" data-id=\"4cbb6481\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le syst\u00e8me HPLC-prep (outil n\u00b09) est principalement utilis\u00e9 dans le laboratoire pour s\u00e9parer et isoler des acides amin\u00e9s sp\u00e9cifiques provenant du collag\u00e8ne d\u2019ossements arch\u00e9ologiques afin de les dater. En effet, des r\u00e9sultats plus pr\u00e9cis peuvent \u00eatre obtenus lorsque la datation par le radiocarbone est effectu\u00e9e sur des mol\u00e9cules sp\u00e9cifiques (acides amin\u00e9s) au lieu de mat\u00e9riaux dans leur ensemble (collag\u00e8ne). On s\u2019int\u00e9resse en particulier \u00e0 l\u2019hydroxyproline (HYP) qui est l\u2019un des acides amin\u00e9s pr\u00e9pond\u00e9rants dans le collag\u00e8ne (Devi\u00e8se et al. 2018). Cette approche mol\u00e9culaire offre actuellement un excellent niveau de fiabilit\u00e9 qu\u2019aucune autre m\u00e9thode ne peut atteindre en particulier dans le cas d\u2019\u00e9chantillons fortement contamin\u00e9s (Devi\u00e8se et al. 2021, Pr\u00fcfer et al. 2021, Dinnis et al. 2021, Skov et al. 2022). Elle sera utilis\u00e9e en particulier dans le cadre du projet ANR NeHos (<em>From Neanderthals to Homo sapiens \u2013 Understanding a cultural (r)evolution in Europe during the Palaeolithic<\/em>) pilot\u00e9 par Thibaut Devi\u00e8se.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7e2fd32c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7e2fd32c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-2b82ffcb\" data-id=\"2b82ffcb\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-79d464f3\" data-id=\"79d464f3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c6b00f2 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"c6b00f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-23f00a38 elementor-widget elementor-widget-heading\" data-id=\"23f00a38\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">R\u00e9f\u00e9rences de l\u2019unit\u00e9 de g\u00e9ochimie organique\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7b397f1e elementor-widget elementor-widget-text-editor\" data-id=\"7b397f1e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>2022<\/p><p>Rodr\u00edguez-Zorro PA, Ledru MP, Favier C, Bard E, Bicudo DC, Garcia M, Marquardt G, Rostek F, Sawakuchi AO, Simon Q, Tachikawa K, Alternate Atlantic forest and climate phases during the early Pleistocene 41 kyr cycles in southeastern Brazil, <em>Quaternary Science Reviews<\/em> 286, 107560, 1-15, DOI: 10.1016\/j.quascirev.2022.107560 (2022).<\/p><p>Skov L, Peyr\u00e9gne S, Popli D, Iasi LNM, Devi\u00e8se T, Slon V, Zavala EI, Hajdinjak M, S\u00fcmer AP, Grote S, Bossoms Mesa A, L\u00f3pez Herr\u00e1ez D, Nickel B, Nagel S, Richter J, Essel E, Gansauge M, Schmidt A, Korlevi\u0107 P, Comeskey D, Derevianko AP, Kharevich A, Markin SV, Talamo S, Douka K, Krajcarz MT, Roberts RG, Higham T, Viola B, Krivoshapkin AI, Kolobova KA, Kelso J, Meyer M, P\u00e4\u00e4bo S, Peter BM. Genetic insights into the social organization of Neanderthals. <u>Nature<\/u> <strong>610<\/strong>(7932): 519-525, DOI: 10.1038\/s41586-022-05283-y (2022).<\/p><p>2021<\/p><p>Davtian N, Bard E, Darfeuil S, M\u00e9not G, Rostek F. The novel hydroxylated tetraether index RI-OH\u2032 as a sea surface temperature proxy for the 160-45 ka BP period off the Iberian Margin. <em>Paleoceanography &amp; Paleoclimatology<\/em> 36, 1-34, e2020PA004077. DOI: 10.1029\/2020PA004077 (2021).<\/p><p>Devi\u00e8se T, Abrams G, Hajdinjak M, Pirson S, De Groote I, Di Modica K, Toussaint M, Fischer V, Comeskey D, Spindler L, Meyer M, Semal P, Higham T. Reevaluating the timing of Neanderthal disappearance in Northwest Europe. <em>PNAS<\/em> <strong>118<\/strong>(12): e2022466118, DOI: 10.1073\/pnas.2022466118 (2021).<\/p><p>Dinnis R, Bessudnov A, Reynolds N, Devi\u00e8se T, Dudin A, Pate A, Sablin M, Sinitsyn A, Higham T. Eastern Europe\u2019s \u201cTransitional Industry\u201d?: Deconstructing the Early Streletskian. <em>Journal of Paleolithic Archaeology<\/em> <strong>4<\/strong>(1): 6, DOI: 10.1007\/s41982-021-00076-7 (2021).<\/p><p>Pr\u00fcfer K, Posth C, Yu H, Stoessel A, Spyrou MA, Deviese T, Mattonai M, Ribechini E, Higham T, Velem\u00ednsk\u00fd P, Br\u016f\u017eek J, Krause J. A genome sequence from a modern human skull over 45,000 years old from Zlat\u00fd k\u016f\u0148 in Czechia. <em>Nature Ecology &amp; Evolution<\/em> <strong>5<\/strong>: 820\u2013825, DOI: 10.1038\/s41559-021-01443-x (2021).<\/p><p>2020<em>\u00a0<\/em><\/p><p>Rodriguez-Zorro PA, Ledru MP, Bard E, Aquino-Alfonso O, Camejo A, Daniau AL, Favier C, Garcia M, Mineli TD, Rostek F, Sawakuchi A, Simon Q, Tachikawa K, Thouveny N. Shut down of the South American summer monsoon during the penultimate glacial. <em>Scientific Reports<\/em> 10: 6275, 1-11, + 18 p. suppl., DOI: 10.1038\/s41598-020-62888-x (2020).<\/p><p>Martin C, Menot G, Thouveny N, Peyron O, Andrieu-Ponel V, Montade V, Davtian N, Reille M, Bard E. Early Holocene Thermal Maximum recorded by branched tetraethers and pollen in Western Europe (Massif Central, France). <em>Quaternary Science Reviews <\/em>228, 106109, 1-21, DOI: 10.1016\/j.quascirev.2019.106109 (2020).<\/p><p>M\u00e9not G, Pivot S, Bouloubassi I, Davtian N, Hennekam R, Bosch D, Ducassou E, Bard E, Migeon S, Revel M. Timing and stepwise transitions of the African Humid Period from geochemical proxies in the Nile deep-sea fan sediments. <em>Quaternary Science Reviews <\/em>228, 106071, 1-14, DOI: 10.1016\/j.quascirev.2019.106071 (2020).<\/p><p>2019<\/p><p>Martin C, M\u00e9not G, Thouveny N, Davtian N, Andrieu-Ponel V, Reille M, Bard E. Impact of human activities and vegetation changes on the tetraether sources in Lake St Front (Massif Central, France). <em>Organic Geochemistry<\/em> 135, 38-52, DOI: 10.1016\/j.orggeochem.2019.06.005 (2019).<\/p><p>Davtian N, M\u00e9not G, Fagault Y, Bard E. Western Mediterranean Sea paleothermometry over the last glacial cycle based on the novel RI\u2010OH index. <em>Paleoceanography and Paleoclimatology<\/em> 34, 616-634, + 4 p. suppl., DOI: 10.1029\/2018PA003452 (2019).<\/p><p>2018<\/p><p>Davtian N, Bard E, M\u00e9not G, Fagault Y. The importance of mass accuracy in selected ion monitoring analysis of branched and isoprenoid tetraethers. <em>Organic Geochemistry<\/em> 118, 58-62, DOI: 10.1016\/j.orggeochem.2018.01.007 (2018).<\/p><p>Devi\u00e8se T,\u00a0Comeskey D,\u00a0McCullagh J,\u00a0Bronk Ramsey C,\u00a0Higham T. New protocol for compound-specific radiocarbon analysis of archaeological bones. <em>Rapid Communications in Mass Spectrometry<\/em> 32 (5), 373-379 (2018).<\/p><p>2017<\/p><p>Guerra L, Piovano EL, C\u00f3rdoba FE, Tachikawa K, Rostek F, Garcia M, Bard E, Sylvestre S. Climate change evidences from the end of the Little Ice Age to the Current Warm Period registered by Melincu\u00e9 Lake (Northern Pampas, Argentina). <em>Quaternary International <\/em>438 (A), 160-174, DOI: 10.1016\/j.quaint.2016.06.033 (2017).<\/p><p>2016<\/p><p>Shumilovskikh LS, Hopper K, Djamali M, Ponel P, Demory F, Rostek F, Tachikawa K, Bittmann F, Golyeva A, Guibal F, Talon B, Wang LC, Nezamabadi M, Bard E, Lahijani H, Nokandeh J, Rekavandi HO, de Beaulieu JL, Sauer S, Andrieu-Ponel V. Landscape evolution and agro-sylvo-pastoral activities on the Gorgan Plain (NE Iran) in the last 6000 years. <em>The Holocene <\/em>26, 1676-1691, DOI: 10.1177\/0959683616646841 (2016).<\/p><p>Davtian N, M\u00e9not G, Bard E, Poulenard J, Podwojewski P. Considering soil types for the calibration of molecular proxies for soil pH and temperature. <em>Organic Geochemistry <\/em>101, 140-153, DOI: 10.1016\/j.orggeochem.2016.09.002 (2016).<\/p><p>Darfeuil S, M\u00e9not G, Giraud X, Rostek F, Tachikawa K, Garcia M, Bard E. Sea surface temperature reconstructions over the last 70 kyr off Portugal: biomarker data and regional modeling. <em>Paleoceanography<\/em> <em>and Paleoclimatology,<\/em> 31, 40-65, + 15 p. suppl., DOI: 10.1002\/2015PA002831 (2016).<\/p><p>2015<\/p><p>Wegwerth A,\u00a0Ganopolski A, M\u00e9not G,\u00a0Kaiser J, Dellwig O,\u00a0Bard E, Lamy F, Arz HW.\u00a0Black Sea temperature response to glacial millennial-scale climate variability.\u00a0<em>Geophysical Research Letters 42, 8147-8154, <\/em>DOI\u00a0: 10.1002\/2015GL065499 (2015).<\/p><p>Sanchi L, M\u00e9not G, Bard E. Environmental controls on paleo pH at mid-latitudes: a case study from Central and Eastern Europe. <em>Palaeogeography, Palaeoclimatology and Palaeoecology <\/em>417, 458-466, DOI: 10.1016\/j.palaeo.2014.10.007 (2015).<\/p><p>2014<\/p><p>Wegwerth A, Dellwig O, Kaiser J, M\u00e9not G, Bard E, Shumilovskikh L, Schnetger B, Kleinhanns IC, Wille M, Arz HW. Meltwater events and the Mediterranean reconnection at the Saalian\u2013Eemian transition in the Black Sea. <em>Earth and Planetary Science Letters <\/em>404, 124-135, DOI: 10.1016\/j.epsl.2014.07.030 (2014).<\/p><p>Sanchi L, M\u00e9not G, Bard E. Insights into continental temperatures in the northwestern Black Sea area during the last glacial period using branched tetraether lipids. <em>Quaternary Science Reviews<\/em> 84, 98-108, DOI: 10.1016\/j.quascirev.2013.11.013, (2014).<\/p><p>2013<\/p><p>Bard E, M\u00e9not G, Rostek F, Licari L, B\u00f6ning P, Edwards RL, Cheng H, Wang YJ, Heaton TJ. Radiocarbon calibration\/comparison records based on marine sediments from the Pakistan and Iberian Margins. <em>Radiocarbon<\/em> 55(4): 1999-2019, DOI: 10.2458\/azu_js_rc.55.17114, (2013).<\/p><p>Rostek F, Bard E. Hydrological changes in Eastern Europe during the last 40,000 years inferred from biomarkers in Black Sea sediments. <em>Quaternary Research<\/em> 80, 502-509 DOI: 10.1016\/j.yqres.2013.07.003, (2013).<\/p><p>Sanchez-Goni MF, Bard E, Landais A, Rossignol L, d\u2019Errico F. Air\u2013sea temperature decoupling in western Europe during the last interglacial\u2013glacial transition. <em>Nature Geoscience<\/em> 6, 837-841, + 8 p. suppl., DOI: 10.1038\/NGEO1924, (2013).<\/p><p>Soulet G, M\u00e9not G, Bayon G, Rostek F, Ponzevera, Toucanne S, Lericolais G, Bard E. Abrupt drainage cycles of the Fennoscandian Ice sheet. <em>Proceedings of the National Academy of Sciences<\/em> 110 (17), 6682-6687, + 4 p. suppl. &amp; 4 Tables, DOI: 10.1073\/pnas.1214676110, (2013).<\/p><p>Sanchi L, M\u00e9not G, Bard E. An automated purification method for archaeal and bacterial tetraethers in soils and sediments. <em>Organic Geochemistry<\/em> 54, 83-90, DOI: 10.1016\/j.orggeochem.2012.10.005, (2013).<\/p><p>2012<\/p><p>M\u00e9not G, Bard E. A precise search for drastic temperature shifts of the past 40,000 years in southeastern Europe. Paleoceanography 27, PA2210, 1-13, DOI:10.1029\/2012PA002291, (2012).<\/p><p>2011<\/p><p>Soulet G, M\u00e9not G, Garreta V, Rostek F, Lericolais G, Zaragosi S, Bard E. Black Sea \u201cLake\u201d reservoir age evolution since the Late Glacial hydrologic and climatic implications. <em>Earth and Planetary Science Letters<\/em> 308, 245-258, DOI: 10.1016\/j.epsl.2011.06.002 (2011).<\/p><p>Sepulcre S, Vidal L, Tachikawa K, Rostek F, Bard E. Sea-surface salinity variations in the Northern Caribbean Sea across the mid-Pleistocene transition. <em>Climate of the Past <\/em>7, 75-90, DOI: 10.5194\/cp-7-75-2011, (2011).<\/p><p>2010<\/p><p>M\u00e9not G, Bard E. Geochemical evidence for a large methane release during the last deglaciation from Marmara Sea sediments. <em>Geochimica et Cosmochimica Acta <\/em>74, 1537-1550, DOI: 10.1016\/j.gca.2009.11.022, (2010).<\/p><p>Vidal L, M\u00e9not G, Joly C, Bruneton H, Rostek F, Cagatay N, Major C, Bard E. Marmara Sea hydrology over the last 23000 years: implications for the connection with the Black Sea and the sapropel deposition. <em>Paleoceanography<\/em> 25, PA1205, 1-16, DOI: 10.1029\/2009PA001735, (2010).<\/p><p>2009<\/p><p>Bard E, Rickaby R. Migration of the Subtropical Front as a modulator of glacial climate. <em>Nature <\/em>406, 380-383 + 10 p. suppl., (2009).<\/p><p>Naughton F, Sanchez Goni M-F, Kageyama M, Bard E, Duprat J, Cortijo E, Malaiz\u00e9 B, Joly C, Rostek F, Turon J-L. Wet to dry climatic trend in northwestern Iberia within Heinrich events. <em>Earth and Planetary Science Letters<\/em> 284, 329-342, (2009).<\/p><p>Saher MH, Rostek F, Jung SJA, Bard E, Schneider RR, Greaves M, Ganssen GM, Elderfield H, Kroon D. Western Arabian Sea SST in the penultimate and last interglacial: a comparison of Uk\u201937 and Mg\/Ca palaeothermometry. <em>Paleoceanography <\/em>24, PA2212, 1-12, DOI : 10.1029\/2007PA001557, (2009).<\/p><p>Schouten S, Hopmans H, van der Meer J, Mets A, Bard E, Bianchi T, Diefendorf A, Escala M, Freeman KH, Huguet C, Ingalls A, M\u00e9not G, Nederbragt AJ, Oba M, Pearson A, Pearson E, Rosell-Mel\u00e9 A, Schaeffer P, Smittenberg R, Talbot HM, Uchida M, van Moy B, Yamamoto M, Zhang Z, Sinninghe Damst\u00e9 JS. An interlaboratory study of TEX86 and BIT analysis using high performance liquid chromatography\/mass spectrometry. <em>Geochemistry Geophysics Geosystems (G-cubed) 10, <\/em>1-13, DOI:10.1029\/2008GC002221, (2009).<\/p><p>Waelbroeck C, Paul A, Kucera M, Rosell-Mel\u00e9 A, Weinelt M, Schneider R, Mix AC, Abelmann A, Armand L, Bard E, Barker S, Barrows TT, Benway H, Cacho I, Chen M-T, Cortijo E, Crosta X, de Vernal A, Dokken T, Duprat J, Elderfield H, Eynaud F, Gersonde R, Hayes A, Henry M, Hillaire-Marcel C, Huang C-C, Jansen E, Juggins S, Kallel N, Kiefer T, Kienast M, Labeyrie L, Leclaire H, Londeix L, Mangin S, Matthiessen J, Marret F, Meland M, Morey AE, Mulitza S, Pflaumann U, Pisias NG, Radi T, Rochon A, Rohling EJ, Sbaffi L, Sch\u00e4fer-Neth C, Solignac S, Spero H, Tachikawa K, Turon JL. Constraints on the magnitude and patterns of ocean cooling at the Last Glacial Maximum.<em> Nature Geoscience<\/em> 2, 127-132, + 138 p. suppl., DOI: 10.1038\/NGEO411, (2009).<\/p><p>2008<\/p><p>Eris KK, Ryan WBF, Cagatay MN, Lericolais G, Sancar U, Menot G, Bard E. Reply to Comment on \u00ab\u00a0the timing and evolution of the post-glacial transgression across the Sea of Marmara shelf, south of Istanbul\u00a0\u00bb by Hiscott et al., <em>Marine Geology<\/em> 254, 230-236, (2008).<\/p><p>2007<\/p><p>Eris KK, Ryan WBF, Cagatay MN, Sancar U, Lericolais G, Menot G, Bard E, The timing and evolution of the post-glacial transgression across the Sea of Marmara shelf, south of Istanbul, <em>Marine Geology<\/em> 243, 57-76, (2007).<\/p><p>de Garidel-Thoron T, Rosenthal Y, Beaufort L, Bard E, Sonzogni C, Mix A, A multiproxy assessment of the equatorial Pacific hydrography during the last 30 ky. <em>Paleoceanography<\/em> 22, PA3204, 1-18, DOI :10.1029\/2006PA001269, (2007).<\/p><p>Leduc G, Vidal L, Tachikawa K, Rostek F, Sonzogni C, Beaufort L, Bard E. Moisture transport across Central America as a positive feedback on abrupt climatic changes.<em> Nature<\/em> 445, 908-911 + 25 p. suppl. (2007).<\/p><p>Rickaby REM, Bard E, Sonzogni C, Rostek F, Beaufort L, Barker S, Rees G, Schrag D. Coccolith chemistry reveals secular variations in the global ocean carbon cycle\u00a0? <em>Earth and Planetary Science Letters<\/em> 253, 83-95, (2007).<\/p><p>2006<\/p><p>M\u00e9not G, Bard E, Rostek F, Weijers JWH, Hopmans EC, Schouten S, Sinninghe Damst\u00e9 JS. Early reactivation of European rivers during the last deglaciation. <em>Science <\/em>313, 1623-1625 + 6 p. suppl. (2006).<\/p><p>Bard E, Rostek F, M\u00e9not-Combes G. Chronologie des variations climatiques rapides pendant la derni\u00e8re p\u00e9riode glaciaire. <em>Comptes Rendus de l&#8217;Acad\u00e9mie des Sciences (C.R. Palevol)<\/em> 5, 13-19, (2006).<\/p><p>2004<\/p><p>Bard E, M\u00e9not-Combes G, Rostek F. Present status of radiocarbon calibration and comparison records based on polynesian corals and Iberian Margin sediments. <em>Radiocarbon<\/em> 46, 1189-1203, (2004).<\/p><p>Bard E, Rostek F, M\u00e9not-Combes G. Radiocarbon calibration beyond 20,000 B.P. by means of planktonic foraminifera of the Iberian Margin. <em>Quaternary Research<\/em> 61 (2), 204-214, (2004).<\/p><p>Rosell-Mel\u00e9 A, Bard E, Emeis KC, Grieger B, Hewitt C, M\u00fcller PJ, Schneider RR. Sea surface temperature glacial anomalies in the global ocean estimated from the alkenone UK37&#8242; index: comparison with GCMs. <em>Geophysical Research Letters<\/em> 31, L03208, 1-4, (2004).<\/p><p>2003<\/p><p>Schulte S, Bard E. Past changes of biologically mediated dissolution of calcite above the chemical lysocline documented in Indian Ocean sediments. <em>Quaternary Science Reviews <\/em>22, 1757-1770, (2003).<\/p><p>2002<\/p><p>Bard E, Delaygue G, Rostek F, Antonioli F, Silenzi S, Schrag DP. Hydrological conditions over the western Mediterranean basin during the deposition of the cold sapropel 6 event. <em>Earth and Planetary Science Letters <\/em>202, 481-494 (2002).<\/p><p>Pailler D, Bard E. High frequency paleoceanographic changes during the past 140,000 years recorded by the organic matter in sediments off the Iberian Margin. <em>Palaeogeography, Palaeoclimatology and Palaeoecology <\/em>181, 431-452, (2002).<\/p><p>Sicre M-A, Bard E, Ezat U, Rostek F. Alkenones distributions in the North Atlantic and Nordic sea surface waters. <em>Geochemistry, Geophysics and Geosystems (G-cubed)<\/em> 3 (2), 2001GC000159, 1-13, DOI: 10.1029<em>\/2001GC000159<\/em> (2002).<\/p><p>Pailler D, Bard E, Rostek F, Zheng Y, Mortlock R, van Geen A. Burial of redox-sensitive metals and organic matter in the equatorial Indian Ocean linked to precession. <em>Geochimica et Cosmochimica Acta <\/em>66, 849-865, (2002).<\/p><p>2001<\/p><p>Rosell-Mel\u00e9 A, Bard E, Emeis K-C, Grimalt JO, M\u00fcller P, Schneider RR, Blanz T, Bouloubassi I, Epstein B, Fahl K, Fluegge A, Freeman K, Goni M, G\u00fcntner U, Hartz D, Hellebust S, Herbert T, Ikehara M, Ishiwatari R, Kawamura K, Kenig F, de Leeuw J, Lehman S, Mejanelle L, Ohkouchi N, Pancost RD, Pelejero C, Prahl F, Quinn J, Rontani J-F, Rostek F, Rullk\u00f6tter J, Sachs J, Sawada K, Schulz-Bull D, Sikes E, Sonzogni C, Ternois Y, Versteegh G, Volkman J and\u00a0 Wakeham S. Precision of the current methods to measure the alkenone proxy UK37&#8242; and absolute abundance in sediments: results of an interlaboratory comparison study. <em>Geochemistry, Geophysics and Geosystems (G-cubed)<\/em> 2, 2000GC000141, 1-28, (2001).<\/p><p>Bard E. Comparison of alkenone estimates with other temperature proxies. <em>Geochemistry, Geophysics and Geosystems (G-cubed)<\/em> 2, 2000GC000050, 1-12, (2001).<\/p><p>2000<\/p><p>Mix AC, Bard E, Eglinton G, Keigwin LD, Ravelo AC, Rosenthal Y. Alkenones and multi-proxy strategies in paleoceanographic studies. <em>Geochemistry, Geophysics and Geosystems (G-cubed)<\/em> 1, 2000GC000056, 1-22, (2000).<\/p><p>Bard E, Rostek F, Turon J-L, Gendreau S. Hydrological impact of Heinrich events in the subtropical northeast Atlantic. <em>Science<\/em> 289, 1321-1324 + 2 p. suppl. (2000).<\/p><p>Budziak D, Schneider R, Rostek F, M\u00fcller PJ, Bard E, Wefer G. Late Quaternary insolation forcing on total organic carbon and C37 alkenone variations in the Arabian Sea. <em>Paleoceanography <\/em>15, 307-321, (2000).<\/p><p>1999<\/p><p>Cayre O, Bard E. The last deglaciation in the Eastern Arabian Sea: Planktonic foraminiferal and alkenone records. <em>Quaternary Research <\/em>52, 337-342, (1999).<\/p><p>Schulte S, Rostek F, Bard E, Rullk\u00f6tter J, Marchal O. Variations of oxygen-minimum and primary productivity recorded in sediments of the Arabian Sea. <em>Earth and Planetary Science Letters <\/em>173, 205-221, (1999).<\/p><p>Bard E. Ice age temperatures and geochemistry. <em>Science<\/em> 284, 1133-1134, (1999).<\/p><p>1998<\/p><p>Rosell-Mel\u00e9 A, Bard E, Emeis KC, Farrimond P, Grimalt J, M\u00fcller PJ, Schneider RR. Project takes a new look at past sea surface temperatures. <em>Eos Trans. of AGU<\/em> 79 (33) 393-394, (1998).<\/p><p>Sonzogni C, Bard E, Rostek F. Tropical sea surface temperature during the last glacial period: a view based on alkenones in Indian Ocean. <em>Quaternary Science Reviews<\/em> 17, 1185-1201, (1998).<\/p><p>1997<\/p><p>Rostek F, Bard E, Beaufort L, Sonzogni C, Ganssen G. Sea surface temperature and productivity records for the past 240 kyr in the Arabian Sea. <em>Deep Sea Research II<\/em> 44, 1461-1480, (1997).<\/p><p>Sonzogni C, Bard E, Rostek F, Dollfus D, Rosell-Mel\u00e9 A, Eglinton G. Temperature and salinity effects on alkenones ratios measured in sediments from the Indian Ocean. <em>Quaternary Research<\/em> 47, 344-355, (1997).<\/p><p>Sonzogni C, Bard E, Rostek F, Lafont\u00a0 R, Rosell-Mel\u00e9 A, Eglinton G. Core-top calibration of the alkenone index versus sea surface temperature in the Indian Ocean. <em>Deep Sea Research II<\/em> 44, 1445-1460, (1997).<\/p><p>Bard E, Rostek F, Sonzogni C. Interhemispheric synchrony of the last deglaciation inferred from alkenone palaeothermometry. <em>Nature<\/em> 385, 707-710, (1997).<\/p><p>1994<\/p><p>Rostek F, Ruhland G, Bassinot F, Beaufort L, M\u00fcller PJ, Bard E. Fluctuations of the Indian monsoon regime during the last 170,000 years: evidence from sea surface temperature, salinity and organic carbon records. in Global Precipitations and Climate Change. M. Desbois &amp; F. D\u00e9salmand (eds). NATO ASI Serie I, 26, 27-51, (1994).<\/p><p>1993<\/p><p>Rostek F, Ruhland G, Bassinot F, M\u00fcller PJ, Labeyrie L, Lancelot Y, Bard E. Reconstructing sea surface temperature and salinity using \u2202<sup>18<\/sup>O and alkenone records. <em>Nature<\/em> 364, 319-321, (1993).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Indicateurs pal\u00e9oclimatiques mol\u00e9culaires Le nombre de doubles liaisons de la cha\u00eene carbon\u00e9e des alc\u00e8nones, des mol\u00e9cules produites par les coccolithophorid\u00e9s du phytoplancton, d\u00e9pend de la temp\u00e9rature de l\u2019eau de surface [&hellip;]<\/p>\n","protected":false},"author":551,"featured_media":13888,"parent":13929,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-13945","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"publishpress_future_action":{"enabled":false,"date":"2026-06-27 14:00:02","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/pages\/13945","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/users\/551"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/comments?post=13945"}],"version-history":[{"count":5,"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/pages\/13945\/revisions"}],"predecessor-version":[{"id":15283,"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/pages\/13945\/revisions\/15283"}],"up":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/pages\/13929"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/media\/13888"}],"wp:attachment":[{"href":"https:\/\/www.cerege.fr\/en\/wp-json\/wp\/v2\/media?parent=13945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}