The impact of astronomical forcing on the Late Devonian greenhouse climate
paleoclimate. However, a thorough understanding of the processes that were driving Paleozoic climate change has not yet been reached. The main reason is relatively poor time-control on Paleozoic paleoclimate proxy records. This problemcan be overcomeby the identification of cyclic features resulting...
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Online Access: | http://hdl.handle.net/2078.1/145687 https://doi.org/10.1016/j.gloplacha.2014.06.002 |
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:145687 2024-05-12T08:10:57+00:00 The impact of astronomical forcing on the Late Devonian greenhouse climate De Vleeschouwer, David Crucifix, Michel Bounceur, Nabila Claeys, Philippe UCL - SST/ELI/ELIC - Earth & Climate 2014 http://hdl.handle.net/2078.1/145687 https://doi.org/10.1016/j.gloplacha.2014.06.002 eng eng info:eu-repo/grantAgreement/EC/FP7/EC/FP7/239604 boreal:145687 http://hdl.handle.net/2078.1/145687 doi:10.1016/j.gloplacha.2014.06.002 urn:ISSN:0921-8181 urn:EISSN:1872-6364 info:eu-repo/semantics/restrictedAccess Global and Planetary Change, Vol. 120, p. 65-80 (2014) Late Devonian Astronomical forcing General circulation model HadSM3 Precession Obliquity 1443 info:eu-repo/semantics/article 2014 ftunistlouisbrus https://doi.org/10.1016/j.gloplacha.2014.06.002 2024-04-18T17:55:32Z paleoclimate. However, a thorough understanding of the processes that were driving Paleozoic climate change has not yet been reached. The main reason is relatively poor time-control on Paleozoic paleoclimate proxy records. This problemcan be overcomeby the identification of cyclic features resulting fromastronomical climate forcing in the stratigraphic record. To correctly identify these cyclic features, it is necessary to quantify the effects of astronomical climate forcing under conditions different from today. In this work, we apply Late Devonian (375 Ma) boundary conditions to the Hadley Centre general circulation model (HadSM3).We estimate the response of Late Devonian climate to astronomical forcing by keeping all other forcing factors (e.g. paleogeography, pCO2,vegetation distribution) fixed. Thirty-one different “snapshots†of Late Devonian climate are simulated, by running the model with different combinations of eccentricity (e), obliquity (ε) and precession (eω). From the comparison of these 31 simulations, it appears that feedback mechanisms play an important role in the conversion of astronomically driven insolation variations into climate change, such as the formation of sea-ice and the development of an extensive snow cover on Gondwana. Wecompare the “median orbit†simulation to lithic indicators of paleoclimate to evaluate whether or not HadSM3 validly simulates Late Devonian climates. This comparison suggests that themodel correctly locates themajor climate zones. This study also tests the proposed link between the formation of ocean anoxia and high eccentricity (De Vleeschouwer et al., 2013) by comparing the δ18Ocarb record of the Frasnian–Famennian boundary interval from the Kowala section (Poland) with a simulated time series of astronomically forced changes in mean annual temperature at the paleolocation of Poland. The amplitude of climate change suggested by the isotope record is greater than that of the simulated climate. Hence, astronomically forced climate change may have been ... Article in Journal/Newspaper Sea ice DIAL@USL-B (Université Saint-Louis, Bruxelles) Global and Planetary Change 120 65 80 |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
topic |
Late Devonian Astronomical forcing General circulation model HadSM3 Precession Obliquity 1443 |
spellingShingle |
Late Devonian Astronomical forcing General circulation model HadSM3 Precession Obliquity 1443 De Vleeschouwer, David Crucifix, Michel Bounceur, Nabila Claeys, Philippe The impact of astronomical forcing on the Late Devonian greenhouse climate |
topic_facet |
Late Devonian Astronomical forcing General circulation model HadSM3 Precession Obliquity 1443 |
description |
paleoclimate. However, a thorough understanding of the processes that were driving Paleozoic climate change has not yet been reached. The main reason is relatively poor time-control on Paleozoic paleoclimate proxy records. This problemcan be overcomeby the identification of cyclic features resulting fromastronomical climate forcing in the stratigraphic record. To correctly identify these cyclic features, it is necessary to quantify the effects of astronomical climate forcing under conditions different from today. In this work, we apply Late Devonian (375 Ma) boundary conditions to the Hadley Centre general circulation model (HadSM3).We estimate the response of Late Devonian climate to astronomical forcing by keeping all other forcing factors (e.g. paleogeography, pCO2,vegetation distribution) fixed. Thirty-one different “snapshots†of Late Devonian climate are simulated, by running the model with different combinations of eccentricity (e), obliquity (ε) and precession (eω). From the comparison of these 31 simulations, it appears that feedback mechanisms play an important role in the conversion of astronomically driven insolation variations into climate change, such as the formation of sea-ice and the development of an extensive snow cover on Gondwana. Wecompare the “median orbit†simulation to lithic indicators of paleoclimate to evaluate whether or not HadSM3 validly simulates Late Devonian climates. This comparison suggests that themodel correctly locates themajor climate zones. This study also tests the proposed link between the formation of ocean anoxia and high eccentricity (De Vleeschouwer et al., 2013) by comparing the δ18Ocarb record of the Frasnian–Famennian boundary interval from the Kowala section (Poland) with a simulated time series of astronomically forced changes in mean annual temperature at the paleolocation of Poland. The amplitude of climate change suggested by the isotope record is greater than that of the simulated climate. Hence, astronomically forced climate change may have been ... |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
De Vleeschouwer, David Crucifix, Michel Bounceur, Nabila Claeys, Philippe |
author_facet |
De Vleeschouwer, David Crucifix, Michel Bounceur, Nabila Claeys, Philippe |
author_sort |
De Vleeschouwer, David |
title |
The impact of astronomical forcing on the Late Devonian greenhouse climate |
title_short |
The impact of astronomical forcing on the Late Devonian greenhouse climate |
title_full |
The impact of astronomical forcing on the Late Devonian greenhouse climate |
title_fullStr |
The impact of astronomical forcing on the Late Devonian greenhouse climate |
title_full_unstemmed |
The impact of astronomical forcing on the Late Devonian greenhouse climate |
title_sort |
impact of astronomical forcing on the late devonian greenhouse climate |
publishDate |
2014 |
url |
http://hdl.handle.net/2078.1/145687 https://doi.org/10.1016/j.gloplacha.2014.06.002 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Global and Planetary Change, Vol. 120, p. 65-80 (2014) |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/EC/FP7/239604 boreal:145687 http://hdl.handle.net/2078.1/145687 doi:10.1016/j.gloplacha.2014.06.002 urn:ISSN:0921-8181 urn:EISSN:1872-6364 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2014.06.002 |
container_title |
Global and Planetary Change |
container_volume |
120 |
container_start_page |
65 |
op_container_end_page |
80 |
_version_ |
1798854510816264192 |