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  • Williams, Charles J. R. (author)

African Hydroclimate During the Early Eocene From the DeepMIP Simulations

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:su-205252
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-205252URI
  • https://doi.org/10.1029/2022PA004419DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • The early Eocene (∼56–48 Myr ago) is characterized by high CO2 estimates (1,200–2,500 ppmv) and elevated global temperatures (∼10°C–16°C higher than modern). However, the response of the hydrological cycle during the early Eocene is poorly constrained, especially in regions with sparse data coverage (e.g., Africa). Here, we present a study of African hydroclimate during the early Eocene, as simulated by an ensemble of state-of-the-art climate models in the Deep-time Model Intercomparison Project (DeepMIP). A comparison between the DeepMIP pre-industrial simulations and modern observations suggests that model biases are model- and geographically dependent, however, these biases are reduced in the model ensemble mean. A comparison between the Eocene simulations and the pre-industrial suggests that there is no obvious wetting or drying trend as the CO2 increases. The results suggest that changes to the land sea mask (relative to modern) in the models may be responsible for the simulated increases in precipitation to the north of Eocene Africa. There is an increase in precipitation over equatorial and West Africa and associated drying over northern Africa as CO2 rises. There are also important dynamical changes, with evidence that anticyclonic low-level circulation is replaced by increased south-westerly flow at high CO2 levels. Lastly, a model-data comparison using newly compiled quantitative climate estimates from paleobotanical proxy data suggests a marginally better fit with the reconstructions at lower levels of CO2.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Lunt, Daniel J. (author)
  • Salzmann, Ulrich (author)
  • Reichgelt, Tammo (author)
  • Inglis, Gordon N. (author)
  • Greenwood, David R. (author)
  • Chan, Wing-Le (author)
  • Abe-Ouchi, Ayako (author)
  • Donnadieu, Yannick (author)
  • Hutchinson, David K.Stockholms universitet,Institutionen för geologiska vetenskaper,University of New South Wales, Australia(Swepub:su)dhutc (author)
  • de Boer, Agatha M.Stockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)adebo (author)
  • Ladant, Jean-Baptiste (author)
  • Morozova, Polina A. (author)
  • Niezgodzki, Igor (author)
  • Knorr, Gregor (author)
  • Steinig, Sebastian (author)
  • Zhang, Zhongshi (author)
  • Zhu, Jiang (author)
  • Huber, Matthew (author)
  • Otto-Bliesner, Bette L. (author)
  • Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

Related titles

  • In:Paleoceanography and Paleoclimatology37:52572-45172572-4525

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