Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export
The primary impacts of anthropogenic CO2 emissions on marine biogeochemical cycles predicted so far include ocean acidification, global warming induced shifts in biogeographical provinces, and a possible negative feedback on atmospheric CO2 levels by CO2-fertilized biological production. Here we rep...
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ftoregonstate:ir.library.oregonstate.edu:bg257g433 2024-04-14T08:17:46+00:00 Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export Oschlies, Andreas Schulz, Kai G. Riebesell, Ulf Schmittner, Andreas https://ir.library.oregonstate.edu/concern/articles/bg257g433 English [eng] eng unknown American Geophysical Union https://ir.library.oregonstate.edu/concern/articles/bg257g433 Copyright Not Evaluated Article ftoregonstate 2024-03-21T15:42:56Z The primary impacts of anthropogenic CO2 emissions on marine biogeochemical cycles predicted so far include ocean acidification, global warming induced shifts in biogeographical provinces, and a possible negative feedback on atmospheric CO2 levels by CO2-fertilized biological production. Here we report a new potentially significant impact on the oxygen-minimum zones of the tropical oceans. Using a model of global climate, ocean circulation, and biogeochemical cycling, we extrapolate mesocosm-derived experimental findings of a pCO2-sensitive increase in biotic carbon-to-nitrogen drawdown to the global ocean. For a simulation run from the onset of the industrial revolution until A.D. 2100 under a ‘‘business-as-usual’’ scenario for anthropogenic CO2 emissions, our model predicts a negative feedback on atmospheric CO2 levels, which amounts to 34 Gt C by the end of this century. While this represents a small alteration of the anthropogenic perturbation of the carbon cycle, the model results reveal a dramatic 50% increase in the suboxic water volume by the end of this century in response to the respiration of excess organic carbon formed at higher CO2 levels. This is a significant expansion of the marine ‘‘dead zones’’ with severe implications not only for all higher life forms but also for oxygen-sensitive nutrient recycling and, hence, for oceanic nutrient inventories. Article in Journal/Newspaper Ocean acidification ScholarsArchive@OSU (Oregon State University) |
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ScholarsArchive@OSU (Oregon State University) |
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ftoregonstate |
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English unknown |
description |
The primary impacts of anthropogenic CO2 emissions on marine biogeochemical cycles predicted so far include ocean acidification, global warming induced shifts in biogeographical provinces, and a possible negative feedback on atmospheric CO2 levels by CO2-fertilized biological production. Here we report a new potentially significant impact on the oxygen-minimum zones of the tropical oceans. Using a model of global climate, ocean circulation, and biogeochemical cycling, we extrapolate mesocosm-derived experimental findings of a pCO2-sensitive increase in biotic carbon-to-nitrogen drawdown to the global ocean. For a simulation run from the onset of the industrial revolution until A.D. 2100 under a ‘‘business-as-usual’’ scenario for anthropogenic CO2 emissions, our model predicts a negative feedback on atmospheric CO2 levels, which amounts to 34 Gt C by the end of this century. While this represents a small alteration of the anthropogenic perturbation of the carbon cycle, the model results reveal a dramatic 50% increase in the suboxic water volume by the end of this century in response to the respiration of excess organic carbon formed at higher CO2 levels. This is a significant expansion of the marine ‘‘dead zones’’ with severe implications not only for all higher life forms but also for oxygen-sensitive nutrient recycling and, hence, for oceanic nutrient inventories. |
format |
Article in Journal/Newspaper |
author |
Oschlies, Andreas Schulz, Kai G. Riebesell, Ulf Schmittner, Andreas |
spellingShingle |
Oschlies, Andreas Schulz, Kai G. Riebesell, Ulf Schmittner, Andreas Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export |
author_facet |
Oschlies, Andreas Schulz, Kai G. Riebesell, Ulf Schmittner, Andreas |
author_sort |
Oschlies, Andreas |
title |
Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export |
title_short |
Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export |
title_full |
Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export |
title_fullStr |
Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export |
title_full_unstemmed |
Simulated 21st century’s increase in oceanic suboxia by CO2-enhanced biotic carbon export |
title_sort |
simulated 21st century’s increase in oceanic suboxia by co2-enhanced biotic carbon export |
publisher |
American Geophysical Union |
url |
https://ir.library.oregonstate.edu/concern/articles/bg257g433 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://ir.library.oregonstate.edu/concern/articles/bg257g433 |
op_rights |
Copyright Not Evaluated |
_version_ |
1796317050612744192 |