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The regional imprints of Dansgaard-Oeschger events on land and marine environments

hal.structure.identifierÉcole Pratique des Hautes Études [EPHE]
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSÁNCHEZ GOÑI, María
hal.structure.identifierArchéosciences Bordeaux
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorFOURCADE, Tiffanie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZORZI, Coralie
hal.structure.identifierCollege of Life and Environmental Sciences [Exeter]
dc.contributor.authorURREGO, Dunia
hal.structure.identifierInstitut für Umweltphysik [Heidelberg]
dc.contributor.authorWEITZEL, Nils
dc.date.conference2023-07-14
dc.description.abstractEnOne of the most important challenges of the IPCC is documenting the regional impact of the present-day global warming. Yet, identifying the regional expression of global changes is the first and necessary step to understand the mechanisms behind them. The best examples of past global warming events, comparable in velocity and magnitude to those expected in the 21st-century, are those associated with the Dansgaard–Oeschger (D–O) cycles that punctuated the last glacial period, ~115,000-27,000 years ago (115-27 ka). Reasonably well-chronologically constrained deep-sea and terrestrial records of D-O cycles provide an excellent opportunity for documenting the nature (shape, amplitude, timing and duration) of the vegetation, fire and oceanic regional responses to past rapid global warming events. Building on the ACER (https://doi.org/10.1594/PANGAEA.870867) and PaleoJump (https://www.tipes.dk/paleojump-a-tipes-database-for-research-on-rapid-climate-transitions/) databases, I will present a new compilation of D-O records from geochemical, sedimentological and micropaleontological data. I will pay particular attention to one of the best dated event, the D-O 8, centered at ~38,000 years ago (38 ka). It followed the Heinrich Stadial 4 cold phase (~40 -38 years ago), and occurred during a period of minima in precession and intermediate ice volume (Marine Isotope Stage 3). Compared to the other D-O events, D-O 8 was marked by strong Greenland warming, ~10°C, and strong increase in atmospheric CH4 and CO2 concentrations, by at around 150 ppb and 20 ppm, respectively, and was associated with a vigorous resumption of the Atlantic Meridional Overturning Circulation. D-O 8 warming has also the advantage to be relatively recent and, therefore, one of the best recorded all around the world.
dc.language.isoen
dc.title.enThe regional imprints of Dansgaard-Oeschger events on land and marine environments
dc.typeCommunication dans un congrès
dc.subject.halSciences de l'environnement
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologie
bordeaux.conference.titleXXI INQUA Congress
bordeaux.countryIT
bordeaux.conference.cityRome
bordeaux.peerReviewedoui
hal.identifierhal-04234973
hal.version1
hal.proceedingsnon
hal.conference.end2023-07-20
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04234973v1
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