Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination V
<p>Among the 100 kyr climatic cycles of the Late Pleistocene, Termination V (TV, <span class="inline-formula">∼</span> 433–404 kyr BP), the fifth last deglaciation, stands out for its minimum in astronomical forcing associated paradoxically with maxima in sea level, Antar...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-06-01
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| Series: | Climate of the Past |
| Online Access: | https://cp.copernicus.org/articles/18/1429/2022/cp-18-1429-2022.pdf |
| _version_ | 1818545395269107712 |
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| author | G. Hes G. Hes M. F. Sánchez Goñi M. F. Sánchez Goñi N. Bouttes |
| author_facet | G. Hes G. Hes M. F. Sánchez Goñi M. F. Sánchez Goñi N. Bouttes |
| author_sort | G. Hes |
| collection | DOAJ |
| description | <p>Among the 100 kyr climatic cycles of the Late Pleistocene,
Termination V (TV, <span class="inline-formula">∼</span> 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 <span class="inline-formula">CO<sub>2</sub></span> concentration. However, the driving mechanisms
explaining TV remain only partially understood. For instance, climate models
cannot fully represent the atmospheric <span class="inline-formula">CO<sub>2</sub></span> 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 (<span class="inline-formula">∼</span> 700 years) deep-sea pollen record from the Gulf
of Cádiz (site U1386, 36<span class="inline-formula"><sup>∘</sup></span>49.680<span class="inline-formula"><sup>′</sup></span> N; 7<span class="inline-formula"><sup>∘</sup></span>45.320<span class="inline-formula"><sup>′</sup></span> 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 <span class="inline-formula">CO<sub>2</sub></span> 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 <span class="inline-formula">CO<sub>2</sub></span> sequestration by middle and high-latitude forests of the Northern Hemisphere shortly after the onset of TV.</p> |
| first_indexed | 2024-12-12T07:39:42Z |
| format | Article |
| id | doaj.art-7b31042445a841ab8c7b2e5be85152e8 |
| institution | Directory Open Access Journal |
| issn | 1814-9324 1814-9332 |
| language | English |
| last_indexed | 2024-12-12T07:39:42Z |
| publishDate | 2022-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Climate of the Past |
| spelling | doaj.art-7b31042445a841ab8c7b2e5be85152e82022-12-22T00:32:50ZengCopernicus PublicationsClimate of the Past1814-93241814-93322022-06-01181429145110.5194/cp-18-1429-2022Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination VG. Hes0G. Hes1M. F. Sánchez Goñi2M. F. Sánchez Goñi3N. Bouttes4Département de Géosciences, École Normale Supérieure, PSL Université, Paris, FranceUMR CNRS 5805, EPOC – OASU – Université de Bordeaux, Allee Geoffroy St Hilaire, 33615 Pessac CEDEX, FranceUMR CNRS 5805, EPOC – OASU – Université de Bordeaux, Allee Geoffroy St Hilaire, 33615 Pessac CEDEX, FranceEcole Pratique des Hautes Etudes (EPHE), PSL University, Allée Geoffroy Saint-Hilaire Bât. 18N, 33615 Pessac CEDEX, FranceLaboratoire des Sciences du Climat et de l'environnement, LSCE/IPSL, CEA-CNRS-UVSQ-Université Paris Saclay, 91-198, Gif sur Yvette, France<p>Among the 100 kyr climatic cycles of the Late Pleistocene, Termination V (TV, <span class="inline-formula">∼</span> 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 <span class="inline-formula">CO<sub>2</sub></span> concentration. However, the driving mechanisms explaining TV remain only partially understood. For instance, climate models cannot fully represent the atmospheric <span class="inline-formula">CO<sub>2</sub></span> 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 (<span class="inline-formula">∼</span> 700 years) deep-sea pollen record from the Gulf of Cádiz (site U1386, 36<span class="inline-formula"><sup>∘</sup></span>49.680<span class="inline-formula"><sup>′</sup></span> N; 7<span class="inline-formula"><sup>∘</sup></span>45.320<span class="inline-formula"><sup>′</sup></span> 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 <span class="inline-formula">CO<sub>2</sub></span> 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 <span class="inline-formula">CO<sub>2</sub></span> sequestration by middle and high-latitude forests of the Northern Hemisphere shortly after the onset of TV.</p>https://cp.copernicus.org/articles/18/1429/2022/cp-18-1429-2022.pdf |
| spellingShingle | G. Hes G. Hes M. F. Sánchez Goñi M. F. Sánchez Goñi N. Bouttes Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination V Climate of the Past |
| title | Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination V |
| title_full | Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination V |
| title_fullStr | Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination V |
| title_full_unstemmed | Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination V |
| title_short | Impact of terrestrial biosphere on the atmospheric CO<sub>2</sub> concentration across Termination V |
| title_sort | impact of terrestrial biosphere on the atmospheric co sub 2 sub concentration across termination v |
| url | https://cp.copernicus.org/articles/18/1429/2022/cp-18-1429-2022.pdf |
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