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On the global synchronicity of glacial vegetation changes

dc.rights.licenseopenen_US
hal.structure.identifierInstitut für Umweltphysik [Heidelberg]
dc.contributor.authorWEITZEL, Nils
dc.contributor.authorADAM, Moritz
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSANCHEZ GONI, Maria Fernanda
hal.structure.identifierInstitut des Sciences de l'Evolution de Montpellier [UMR ISEM]
dc.contributor.authorLEDRU, Marie-Pierre
hal.structure.identifierInstitut des Sciences de l'Evolution de Montpellier [UMR ISEM]
dc.contributor.authorMONTADE, Vincent
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZORZI, Coralie
hal.structure.identifierInstitute of Environmental Physics [Heidelberg] [IUP]
dc.contributor.authorREHFELD, Kira
dc.date.accessioned2024-03-11T12:41:09Z
dc.date.available2024-03-11T12:41:09Z
dc.date.issued2023-05-15
dc.date.conference2023-04-23
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188672
dc.description.abstractEnVegetation responds to local climate and carbon dioxide changes with response times ranging from decades to millennia, depending on location, spatial scale, and vegetation characteristic. Here, we focus on orbital timescales, for which all available estimates suggest an equilibrium of vegetation and climate. Over the course of the last glacial period, global mean temperature varied between minima during Marine Isotope Stage (MIS) 4 and MIS2, and a maximum in MIS3. If orbital-scale climate changes followed this global trend across most of the globe, we would expect vegetation changes to feature a similar temporal evolution.Leveraging a global compilation of pollen records, we quantify the synchronicity of orbital-scale vegetation changes within and across regions during the last glacial period. We use the arboreal pollen fraction, statistical mode decompositions, and key taxa as indicators for forest cover changes. Our results suggest that a globally coherent forest cover minimum occurred during MIS2. However, we do not find evidence for other periods of coherent forest cover trends across the globe or either hemisphere. This indicates that vegetation changes were more regionally confined during earlier parts of the last glacial. As chronologies become more uncertain further back in time, we examine the likelihood of dating errors to explain the absence of globally coherent vegetation changes during MIS4 and MIS3. Finally, we compare our results with simulations of climate and vegetation to assess if models capture the diagnosed forest cover trends found in the pollen records. Moreover, this comparison allows us to infer the influence of temperature, moisture availability, and carbon dioxide on vegetation variations during the last glacial period.
dc.language.isoENen_US
dc.title.enOn the global synchronicity of glacial vegetation changes
dc.typeCommunication dans un congrèsen_US
dc.identifier.doi10.5194/egusphere-egu23-9705en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.conference.titleEGU General Assembly Conferenceen_US
bordeaux.teamPALEOen_US
bordeaux.conference.cityVienneen_US
bordeaux.import.sourcehal
hal.identifierhal-04304317
hal.version1
hal.invitednonen_US
hal.proceedingsnonen_US
hal.conference.end2023-04-28
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2023-05-15&rft.au=WEITZEL,%20Nils&ADAM,%20Moritz&SANCHEZ%20GONI,%20Maria%20Fernanda&LEDRU,%20Marie-Pierre&MONTADE,%20Vincent&rft.genre=unknown


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