Dust impact on marine biota and atmospheric CO 2 during glacial periods
International audience We assess the impact of high dust deposition rates on marine biota and atmospheric CO 2 using a state-ofthe-art ocean biogeochemistry model and observations. Our model includes an explicit representation of two groups of phytoplankton and colimitation by iron, silicate, and ph...
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Online Access: | https://hal.science/hal-03131780 https://hal.science/hal-03131780/document https://hal.science/hal-03131780/file/2002PA000810.pdf https://doi.org/10.1029/2002PA000810 |
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ftunivnantes:oai:HAL:hal-03131780v1 2023-05-15T18:18:38+02:00 Dust impact on marine biota and atmospheric CO 2 during glacial periods Bopp, Laurent Kohfeld, Karen Le Quéré, Corinne Aumont, Olivier Max-Planck-Institut für Biogeochemie (MPI-BGC) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2003-06 https://hal.science/hal-03131780 https://hal.science/hal-03131780/document https://hal.science/hal-03131780/file/2002PA000810.pdf https://doi.org/10.1029/2002PA000810 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2002PA000810 hal-03131780 https://hal.science/hal-03131780 https://hal.science/hal-03131780/document https://hal.science/hal-03131780/file/2002PA000810.pdf doi:10.1029/2002PA000810 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-03131780 Paleoceanography, 2003, 18 (2), pp.24. ⟨10.1029/2002PA000810⟩ Last Glacial Maximum pCO2 ocean biogeochemistry dust iron [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2003 ftunivnantes https://doi.org/10.1029/2002PA000810 2023-01-18T00:30:33Z International audience We assess the impact of high dust deposition rates on marine biota and atmospheric CO 2 using a state-ofthe-art ocean biogeochemistry model and observations. Our model includes an explicit representation of two groups of phytoplankton and colimitation by iron, silicate, and phosphate. When high dust deposition rates from the Last Glacial Maximum (LGM) are used as input, our model shows an increase in the relative abundance of diatoms in today's iron-limited regions, causing a global increase in export production by 6% and an atmospheric CO 2 drawdown of 15 ppm. When the combined effects of changes in dust, temperature, ice cover, and circulation are included, the model reproduces roughly our reconstruction of regional changes in export production during the LGM based on several paleoceanographic indicators. In particular, the model reproduces the latitudinal dipole in the Southern Ocean, driven in our simulations by the conjunction of dust, sea ice, and circulation changes. In the North Pacific the limited open ocean data suggest that we correctly simulate the eastwest gradient in the open ocean, but more data are needed to confirm this result. From our model-data comparison and from the timing of the dust record at Vostok, we argue that our model estimate of the role of dust is realistic and that the maximum impact of high dust deposition on atmospheric CO 2 must be <30 ppm. Article in Journal/Newspaper Sea ice Southern Ocean Université de Nantes: HAL-UNIV-NANTES Pacific Southern Ocean Paleoceanography 18 2 n/a n/a |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Last Glacial Maximum pCO2 ocean biogeochemistry dust iron [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
Last Glacial Maximum pCO2 ocean biogeochemistry dust iron [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Bopp, Laurent Kohfeld, Karen Le Quéré, Corinne Aumont, Olivier Dust impact on marine biota and atmospheric CO 2 during glacial periods |
topic_facet |
Last Glacial Maximum pCO2 ocean biogeochemistry dust iron [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience We assess the impact of high dust deposition rates on marine biota and atmospheric CO 2 using a state-ofthe-art ocean biogeochemistry model and observations. Our model includes an explicit representation of two groups of phytoplankton and colimitation by iron, silicate, and phosphate. When high dust deposition rates from the Last Glacial Maximum (LGM) are used as input, our model shows an increase in the relative abundance of diatoms in today's iron-limited regions, causing a global increase in export production by 6% and an atmospheric CO 2 drawdown of 15 ppm. When the combined effects of changes in dust, temperature, ice cover, and circulation are included, the model reproduces roughly our reconstruction of regional changes in export production during the LGM based on several paleoceanographic indicators. In particular, the model reproduces the latitudinal dipole in the Southern Ocean, driven in our simulations by the conjunction of dust, sea ice, and circulation changes. In the North Pacific the limited open ocean data suggest that we correctly simulate the eastwest gradient in the open ocean, but more data are needed to confirm this result. From our model-data comparison and from the timing of the dust record at Vostok, we argue that our model estimate of the role of dust is realistic and that the maximum impact of high dust deposition on atmospheric CO 2 must be <30 ppm. |
author2 |
Max-Planck-Institut für Biogeochemie (MPI-BGC) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Bopp, Laurent Kohfeld, Karen Le Quéré, Corinne Aumont, Olivier |
author_facet |
Bopp, Laurent Kohfeld, Karen Le Quéré, Corinne Aumont, Olivier |
author_sort |
Bopp, Laurent |
title |
Dust impact on marine biota and atmospheric CO 2 during glacial periods |
title_short |
Dust impact on marine biota and atmospheric CO 2 during glacial periods |
title_full |
Dust impact on marine biota and atmospheric CO 2 during glacial periods |
title_fullStr |
Dust impact on marine biota and atmospheric CO 2 during glacial periods |
title_full_unstemmed |
Dust impact on marine biota and atmospheric CO 2 during glacial periods |
title_sort |
dust impact on marine biota and atmospheric co 2 during glacial periods |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-03131780 https://hal.science/hal-03131780/document https://hal.science/hal-03131780/file/2002PA000810.pdf https://doi.org/10.1029/2002PA000810 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-03131780 Paleoceanography, 2003, 18 (2), pp.24. ⟨10.1029/2002PA000810⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2002PA000810 hal-03131780 https://hal.science/hal-03131780 https://hal.science/hal-03131780/document https://hal.science/hal-03131780/file/2002PA000810.pdf doi:10.1029/2002PA000810 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2002PA000810 |
container_title |
Paleoceanography |
container_volume |
18 |
container_issue |
2 |
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n/a |
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n/a |
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1766195269192384512 |