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, ∼ 433–404 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 d...
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Online Access: | https://doi.org/10.5194/cp-18-1429-2022 https://cp.copernicus.org/articles/18/1429/2022/ |
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ftcopernicus:oai:publications.copernicus.org:cp98624 2023-05-15T14:02:18+02:00 Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V Hes, Gabriel Sánchez Goñi, María F. Bouttes, Nathaelle 2022-06-27 application/pdf https://doi.org/10.5194/cp-18-1429-2022 https://cp.copernicus.org/articles/18/1429/2022/ eng eng doi:10.5194/cp-18-1429-2022 https://cp.copernicus.org/articles/18/1429/2022/ eISSN: 1814-9332 Text 2022 ftcopernicus https://doi.org/10.5194/cp-18-1429-2022 2022-07-04T16:22:42Z Among the 100 kyr climatic cycles of the Late Pleistocene, Termination V (TV, ∼ 433–404 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 modelling 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 Cádiz (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 might have delayed the atmospheric CO 2 increase during TV. Finally, the direct comparison of global simulated forests (iLOVECLIM model) to our pollen database reveals overall consistent temperate and boreal forest evolutions despite model biases, thereby supporting the hypothesis of a significant CO 2 sequestration by middle and high-latitude forests of the Northern Hemisphere shortly after the onset of TV. Text Antarc* Antarctic Copernicus Publications: E-Journals Antarctic Climate of the Past 18 6 1429 1451 |
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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, ∼ 433–404 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 modelling 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 Cádiz (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 might have delayed the atmospheric CO 2 increase during TV. Finally, the direct comparison of global simulated forests (iLOVECLIM model) to our pollen database reveals overall consistent temperate and boreal forest evolutions despite model biases, thereby supporting the hypothesis of a significant CO 2 sequestration by middle and high-latitude forests of the Northern Hemisphere shortly after the onset of TV. |
format |
Text |
author |
Hes, Gabriel Sánchez Goñi, María F. Bouttes, Nathaelle |
spellingShingle |
Hes, Gabriel Sánchez Goñi, María F. Bouttes, Nathaelle Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V |
author_facet |
Hes, Gabriel Sánchez Goñi, María F. 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 |
2022 |
url |
https://doi.org/10.5194/cp-18-1429-2022 https://cp.copernicus.org/articles/18/1429/2022/ |
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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-18-1429-2022 https://cp.copernicus.org/articles/18/1429/2022/ |
op_doi |
https://doi.org/10.5194/cp-18-1429-2022 |
container_title |
Climate of the Past |
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18 |
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6 |
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1429 |
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1451 |
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1766272505339707392 |