On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation
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 caus...
Published in: | Paleoceanography and Paleoclimatology |
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ftpotsdamik:oai:publications.pik-potsdam.de:item_23243 2023-10-29T02:40:04+01:00 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 application/pdf https://publications.pik-potsdam.de/pubman/item/item_23243 https://publications.pik-potsdam.de/pubman/item/item_23243_1/component/file_23244/8547oa.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1029/2019PA003562 https://publications.pik-potsdam.de/pubman/item/item_23243 https://publications.pik-potsdam.de/pubman/item/item_23243_1/component/file_23244/8547oa.pdf info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ Paleoceanography and Paleoclimatology info:eu-repo/semantics/article 2019 ftpotsdamik https://doi.org/10.1029/2019PA003562 2023-09-30T18:00:11Z 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. Article in Journal/Newspaper Sea ice Publication Database PIK (Potsdam Institute for Climate Impact Research) Paleoceanography and Paleoclimatology 34 8 1375 1398 |
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Publication Database PIK (Potsdam Institute for Climate Impact Research) |
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ftpotsdamik |
language |
unknown |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Brugger, J. Hofmann, M. Petri, S. Feulner, G. |
spellingShingle |
Brugger, J. Hofmann, M. Petri, S. Feulner, G. On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation |
author_facet |
Brugger, J. Hofmann, M. Petri, S. Feulner, G. |
author_sort |
Brugger, J. |
title |
On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation |
title_short |
On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation |
title_full |
On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation |
title_fullStr |
On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation |
title_full_unstemmed |
On the sensitivity of the Devonian climate to continental configuration, vegetation cover, orbital configuration, CO 2 concentration, and insolation |
title_sort |
on the sensitivity of the devonian climate to continental configuration, vegetation cover, orbital configuration, co 2 concentration, and insolation |
publishDate |
2019 |
url |
https://publications.pik-potsdam.de/pubman/item/item_23243 https://publications.pik-potsdam.de/pubman/item/item_23243_1/component/file_23244/8547oa.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Paleoceanography and Paleoclimatology |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019PA003562 https://publications.pik-potsdam.de/pubman/item/item_23243 https://publications.pik-potsdam.de/pubman/item/item_23243_1/component/file_23244/8547oa.pdf |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1029/2019PA003562 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
8 |
container_start_page |
1375 |
op_container_end_page |
1398 |
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1781067880387837952 |