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  On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation

Brugger, J., Hofmann, M., Petri, S., Feulner, G. (2019): On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation. - Paleoceanography and Paleoclimatology, 34, 8, 1375-1398.
https://doi.org/10.1029/2019PA003562

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 Creators:
Brugger, Julia1, Author              
Hofmann, Matthias1, Author              
Petri, Stefan1, Author              
Feulner, Georg1, Author              
Affiliations:
1Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: During the Devonian (419 to 359 million years ago), life on Earth witnessed decisive evolutionary breakthroughs, most prominently the colonization of land by vascular plants and vertebrates. However, it was also a period of major marine extinctions coinciding with marked changes in climate. The cause of these changes remains unknown, and it is therefore instructive to explore systematically how the Devonian climate responds to changes in boundary conditions. Here we use coupled climate model simulations to investigate separately the influence of changes in continental configuration, vegetation cover, carbon dioxide (CO2) concentrations, the solar constant, and orbital parameters on the Devonian climate. The biogeophysical effect of changes in vegetation cover is small, and the cooling due to continental drift is offset by the increasing solar constant. Variations of orbital parameters affect the Devonian climate, with the warmest climate states at high obliquity and high eccentricity. The prevailing mode of decadal to centennial climate variability relates to temperature fluctuations in high northern latitudes which are mediated by coupled oscillations involving sea ice cover, ocean convection, and a regional overturning circulation. The temperature evolution during the Devonian is dominated by the strong decrease in atmospheric CO2. Albedo changes due to increasing vegetation cover cannot explain the temperature rise found in Late Devonian proxy data. Finally, simulated temperatures are significantly lower than estimates based on oxygen isotope ratios, suggesting a lower δ 18O ratio of Devonian seawater.

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 Dates: 2019
 Publication Status: Finally published
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2019PA003562
PIKDOMAIN: RD1 - Earth System Analysis
eDoc: 8547
Research topic keyword: Paleoclimate
Research topic keyword: Biodiversity
Model / method: CLIMBER
Organisational keyword: RD1 - Earth System Analysis
Working Group: Earth System Model Development
Working Group: Earth System Modes of Operation
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Title: Paleoceanography and Paleoclimatology
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 34 (8) Sequence Number: - Start / End Page: 1375 - 1398 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/191023
Publisher: American Geophysical Union (AGU)