Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V
Among the 100 kyr climatic cycles of the late Pleistocene, Termination V (TV, ~[404-433] kyr BP), the fifth last deglaciation, stands out for its minimum in astronomical forcing associated paradoxically with maxima in sea level, Antarctic temperature and atmospheric CO 2 concentration. However, the...
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ftcopernicus:oai:publications.copernicus.org:cpd98624 2023-05-15T14:02:17+02:00 Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V Hes, Gabriel Sánchez Goñi, Maria Fernanda Bouttes, Nathaelle 2021-11-01 application/pdf https://doi.org/10.5194/cp-2021-143 https://cp.copernicus.org/preprints/cp-2021-143/ eng eng doi:10.5194/cp-2021-143 https://cp.copernicus.org/preprints/cp-2021-143/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-2021-143 2021-11-08T17:22:30Z Among the 100 kyr climatic cycles of the late Pleistocene, Termination V (TV, ~[404-433] kyr BP), the fifth last deglaciation, stands out for its minimum in astronomical forcing associated paradoxically with maxima in sea level, Antarctic temperature and atmospheric CO 2 concentration. However, the driving mechanisms explaining TV remain only partially understood. For instance, climate models cannot fully represent the atmospheric CO 2 variation observed in paleoclimate data. Aside from essential oceanic circulation processes, there is increasing evidence that terrestrial biosphere may have played a key role in the global carbon cycle. This study proposes a three-step integrated approach, combining regional and global vegetation records with modeling results, to unveil the evolution of terrestrial biosphere and its contribution to the carbon cycle during TV. First, we provide a new high resolution (~700 years) deep-sea pollen record from the Gulf of Cadiz (Site U1386, 36°49.680 N; 7°45.320 W) for TV, which shows a moderate expansion of the Mediterranean forest. We then construct the first global forest pollen database for this period. Our compilation features distinct evolutions for different types of forest, highlighting a strong development of temperate and boreal forest which may have delayed the atmospheric CO 2 increase during TV. Finally, the direct comparison of global simulated forests (iLOVECLIM model) to our pollen database reveals consistent forest evolutions despite model biases, thereby supporting a CO 2 mitigation by high latitude forests of the northern hemisphere. Text Antarc* Antarctic Copernicus Publications: E-Journals Antarctic |
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Copernicus Publications: E-Journals |
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English |
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Among the 100 kyr climatic cycles of the late Pleistocene, Termination V (TV, ~[404-433] kyr BP), the fifth last deglaciation, stands out for its minimum in astronomical forcing associated paradoxically with maxima in sea level, Antarctic temperature and atmospheric CO 2 concentration. However, the driving mechanisms explaining TV remain only partially understood. For instance, climate models cannot fully represent the atmospheric CO 2 variation observed in paleoclimate data. Aside from essential oceanic circulation processes, there is increasing evidence that terrestrial biosphere may have played a key role in the global carbon cycle. This study proposes a three-step integrated approach, combining regional and global vegetation records with modeling results, to unveil the evolution of terrestrial biosphere and its contribution to the carbon cycle during TV. First, we provide a new high resolution (~700 years) deep-sea pollen record from the Gulf of Cadiz (Site U1386, 36°49.680 N; 7°45.320 W) for TV, which shows a moderate expansion of the Mediterranean forest. We then construct the first global forest pollen database for this period. Our compilation features distinct evolutions for different types of forest, highlighting a strong development of temperate and boreal forest which may have delayed the atmospheric CO 2 increase during TV. Finally, the direct comparison of global simulated forests (iLOVECLIM model) to our pollen database reveals consistent forest evolutions despite model biases, thereby supporting a CO 2 mitigation by high latitude forests of the northern hemisphere. |
format |
Text |
author |
Hes, Gabriel Sánchez Goñi, Maria Fernanda Bouttes, Nathaelle |
spellingShingle |
Hes, Gabriel Sánchez Goñi, Maria Fernanda Bouttes, Nathaelle Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V |
author_facet |
Hes, Gabriel Sánchez Goñi, Maria Fernanda Bouttes, Nathaelle |
author_sort |
Hes, Gabriel |
title |
Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V |
title_short |
Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V |
title_full |
Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V |
title_fullStr |
Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V |
title_full_unstemmed |
Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V |
title_sort |
impact of terrestrial biosphere on the atmospheric co2 concentration across termination v |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-2021-143 https://cp.copernicus.org/preprints/cp-2021-143/ |
geographic |
Antarctic |
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Antarctic |
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Antarc* Antarctic |
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Antarc* Antarctic |
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eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-2021-143 https://cp.copernicus.org/preprints/cp-2021-143/ |
op_doi |
https://doi.org/10.5194/cp-2021-143 |
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1766272471672029184 |