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Lessons from a high-CO2 world: an ocean view from ~ 3 million years ago

2020Journal article Open access
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dc.contributor.authorMcClymont, Erin L.
dc.contributor.authorFord, Heather L.
dc.contributor.authorHo, Sze Ling
dc.contributor.authorTindall, Julia C.
dc.contributor.authorHaywood, Alan M.
dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorBailey, Ian
dc.contributor.authorBerke, Melissa A.
dc.contributor.authorLittler, Kate
dc.contributor.authorPatterson, Molly O.
dc.contributor.authorPetrick, Benjamin
dc.contributor.authorPeterse, Francien
dc.contributor.authorRavelo, A. Christina
dc.contributor.authorRisebrobakken, Bjørg
dc.contributor.authorDe Schepper, Stijn
dc.contributor.authorSwann, George E. A.
dc.contributor.authorThirumalai, Kaustubh
dc.contributor.authorTierney, Jessica E.
dc.contributor.authorvan der Weijst, Carolien
dc.contributor.authorWhite, Sarah
dc.contributor.authorAbe-Ouchi, Ayako
dc.contributor.authorBaatsen, Michiel L. J.
dc.contributor.authorBrady, Esther C.
dc.contributor.authorChan, Wing-Le
dc.contributor.authorChandan, Deepak
dc.contributor.authorFeng, Ran
dc.contributor.authorGuo, Chuncheng
dc.contributor.authorvon der Heydt, Anna S.
dc.contributor.authorHunter, Stephen
dc.contributor.authorLi, Xiangyi
dc.contributor.authorLohmann, Gerrit
dc.contributor.authorNisancioglu, Kerim H.
dc.contributor.authorOtto-Bliesner, Bette L.
dc.contributor.authorPeltier, W. Richard
dc.contributor.authorStepanek, Christian
dc.contributor.authorZhang, Zhongshi
dc.date.accessioned2020-09-30T12:02:15Z
dc.date.available2020-09-30T12:02:15Z
dc.date.issued2020
dc.description.abstractA range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record offers an opportunity to understand climate system response to a range of forcings and feedbacks which operate over multiple temporal and spatial scales. Here, we examine a single interglacial during the late Pliocene (KM5c, ca. 3:205 0:01 Ma) when atmospheric CO2 exceeded pre-industrial concentrations, but were similar to today and to the lowest emission scenarios for this century. As orbital forcing and continental configurations were almost identical to today, we are able to focus on equilibrium climate system response to modern and near-future CO2. Using proxy data from 32 sites, we demonstrate that global mean sea-surface temperatures were warmer than pre-industrial values, by 2:3 C for the combined proxy data (foraminifera Mg=Ca and alkenones), or by 3:2–3.4 C (alkenones only). Compared to the preindustrial period, reduced meridional gradients and enhanced warming in the North Atlantic are consistently reconstructed. There is broad agreement between data and models at the global scale, with regional differences reflecting ocean circulation and/or proxy signals. An uneven distribution of proxy data in time and space does, however, add uncertainty to our anomaly calculations. The reconstructed global mean seasurface temperature anomaly for KM5c is warmer than all but three of the PlioMIP2 model outputs, and the reconstructed North Atlantic data tend to align with the warmest KM5c model values. Our results demonstrate that even under low-CO2 emission scenarios, surface ocean warming may be expected to exceed model projections and will be accentuated in the higher latitudes.pt_PT
dc.description.sponsorshipFCT: SFRH/BPD/96960/2013, PTDC/MAR-PRO/3396/2014, CCMAR UID/Multi/04326/2019pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.5194/cp-16-1599-2020pt_PT
dc.identifier.issn1814-9324
dc.identifier.urihttp://hdl.handle.net/10400.1/14753
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherCopernicus Publicationspt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.titleLessons from a high-CO2 world: an ocean view from ~ 3 million years agopt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1615pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage1599pt_PT
oaire.citation.titleClimate of the Pastpt_PT
oaire.citation.volume16pt_PT
person.familyNameAlonso-Garcia
person.givenNameMontserrat
person.identifier.ciencia-id5B1B-33EE-50B9
person.identifier.orcid0000-0002-0241-2178
person.identifier.scopus-author-id51565655800
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isAuthorOfPublication.latestForDiscovery7772f374-a9c2-41e7-a798-4d811b8a9a48

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