Dust impact on marine biota and atmospheric CO2 during glacial periods
[1] We assess the impact of high dust deposition rates on marine biota and atmospheric CO2 using a state-of-the-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...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.495.6979 2023-05-15T18:18:33+02:00 Dust impact on marine biota and atmospheric CO2 during glacial periods Karen E. Kohfeld Corinne Le Quéré Olivier Aumont The Pennsylvania State University CiteSeerX Archives 2003 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6979 http://lgmacweb.env.uea.ac.uk/green_ocean/publications/Bopp_et_al_Paleoceanogr_2003.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6979 http://lgmacweb.env.uea.ac.uk/green_ocean/publications/Bopp_et_al_Paleoceanogr_2003.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://lgmacweb.env.uea.ac.uk/green_ocean/publications/Bopp_et_al_Paleoceanogr_2003.pdf 4267 Oceanography text 2003 ftciteseerx 2016-01-08T08:45:42Z [1] We assess the impact of high dust deposition rates on marine biota and atmospheric CO2 using a state-of-the-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 CO2 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 east-west 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 CO2 must be <30 Text Sea ice Southern Ocean Unknown Pacific Southern Ocean |
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4267 Oceanography Karen E. Kohfeld Corinne Le Quéré Olivier Aumont Dust impact on marine biota and atmospheric CO2 during glacial periods |
topic_facet |
4267 Oceanography |
description |
[1] We assess the impact of high dust deposition rates on marine biota and atmospheric CO2 using a state-of-the-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 CO2 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 east-west 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 CO2 must be <30 |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Karen E. Kohfeld Corinne Le Quéré Olivier Aumont |
author_facet |
Karen E. Kohfeld Corinne Le Quéré Olivier Aumont |
author_sort |
Karen E. Kohfeld |
title |
Dust impact on marine biota and atmospheric CO2 during glacial periods |
title_short |
Dust impact on marine biota and atmospheric CO2 during glacial periods |
title_full |
Dust impact on marine biota and atmospheric CO2 during glacial periods |
title_fullStr |
Dust impact on marine biota and atmospheric CO2 during glacial periods |
title_full_unstemmed |
Dust impact on marine biota and atmospheric CO2 during glacial periods |
title_sort |
dust impact on marine biota and atmospheric co2 during glacial periods |
publishDate |
2003 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6979 http://lgmacweb.env.uea.ac.uk/green_ocean/publications/Bopp_et_al_Paleoceanogr_2003.pdf |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
http://lgmacweb.env.uea.ac.uk/green_ocean/publications/Bopp_et_al_Paleoceanogr_2003.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.495.6979 http://lgmacweb.env.uea.ac.uk/green_ocean/publications/Bopp_et_al_Paleoceanogr_2003.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766195168079249408 |