How does the phytoplankton–light feedback affect the marine N2O inventory?
The phytoplankton–light feedback (PLF) describes the interaction between phytoplankton biomass and the downwelling shortwave radiation entering the ocean. The PLF allows the simulation of differential heating across the ocean water column as a function of phytoplankton concentration. Only one third...
Published in: | Earth System Dynamics |
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Format: | Article in Journal/Newspaper |
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Copernicus GmbH
2023
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Online Access: | https://archimer.ifremer.fr/doc/00836/94755/102236.pdf https://archimer.ifremer.fr/doc/00836/94755/102237.pdf https://archimer.ifremer.fr/doc/00836/94755/102238.pdf https://archimer.ifremer.fr/doc/00836/94755/102239.pdf https://doi.org/10.5194/esd-14-399-2023 https://archimer.ifremer.fr/doc/00836/94755/ |
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ftarchimer:oai:archimer.ifremer.fr:94755 2023-06-11T04:16:38+02:00 How does the phytoplankton–light feedback affect the marine N2O inventory? Berthet, Sarah Jouanno, Julien Séférian, Roland Gehlen, Marion Llovel, William 2023-04-12 application/pdf https://archimer.ifremer.fr/doc/00836/94755/102236.pdf https://archimer.ifremer.fr/doc/00836/94755/102237.pdf https://archimer.ifremer.fr/doc/00836/94755/102238.pdf https://archimer.ifremer.fr/doc/00836/94755/102239.pdf https://doi.org/10.5194/esd-14-399-2023 https://archimer.ifremer.fr/doc/00836/94755/ eng eng Copernicus GmbH https://archimer.ifremer.fr/doc/00836/94755/102236.pdf https://archimer.ifremer.fr/doc/00836/94755/102237.pdf https://archimer.ifremer.fr/doc/00836/94755/102238.pdf https://archimer.ifremer.fr/doc/00836/94755/102239.pdf doi:10.5194/esd-14-399-2023 https://archimer.ifremer.fr/doc/00836/94755/ info:eu-repo/semantics/openAccess restricted use Earth System Dynamics (2190-4987) (Copernicus GmbH), 2023-04-12 , Vol. 14 , N. 2 , P. 399-412 text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.5194/esd-14-399-2023 2023-05-09T22:50:43Z The phytoplankton–light feedback (PLF) describes the interaction between phytoplankton biomass and the downwelling shortwave radiation entering the ocean. The PLF allows the simulation of differential heating across the ocean water column as a function of phytoplankton concentration. Only one third of the Earth system models contributing to the 6th phase of the Coupled Model Intercomparison Project (CMIP6) include a complete representation of the PLF. In other models, the PLF is either approximated by a prescribed climatology of chlorophyll or not represented at all. Consequences of an incomplete representation of the PLF on the modelled biogeochemical state have not yet been fully assessed and remain a source of multi-model uncertainty in future projection. Here, we evaluate within a coherent modelling framework how representations of the PLF of varying complexity impact ocean physics and ultimately marine production of nitrous oxide (N2O), a major greenhouse gas. We exploit global sensitivity simulations at 1∘ horizontal resolution over the last 2 decades (1999–2018), coupling ocean, sea ice and marine biogeochemistry. The representation of the PLF impacts ocean heat uptake and temperature of the first 300 m of the tropical ocean. Temperature anomalies due to an incomplete PLF representation drive perturbations of ocean stratification, dynamics and oxygen concentration. These perturbations translate into different projection pathways for N2O production depending on the choice of the PLF representation. The oxygen concentration in the North Pacific oxygen-minimum zone is overestimated in model runs with an incomplete representation of the PLF, which results in an underestimation of local N2O production. This leads to important regional differences of sea-to-air N2O fluxes: fluxes are enhanced by up to 24 % in the South Pacific and South Atlantic subtropical gyres but reduced by up to 12 % in oxygen-minimum zones of the Northern Hemisphere. Our results, based on a global ocean–biogeochemical model at CMIP6 ... Article in Journal/Newspaper Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Pacific Earth System Dynamics 14 2 399 412 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The phytoplankton–light feedback (PLF) describes the interaction between phytoplankton biomass and the downwelling shortwave radiation entering the ocean. The PLF allows the simulation of differential heating across the ocean water column as a function of phytoplankton concentration. Only one third of the Earth system models contributing to the 6th phase of the Coupled Model Intercomparison Project (CMIP6) include a complete representation of the PLF. In other models, the PLF is either approximated by a prescribed climatology of chlorophyll or not represented at all. Consequences of an incomplete representation of the PLF on the modelled biogeochemical state have not yet been fully assessed and remain a source of multi-model uncertainty in future projection. Here, we evaluate within a coherent modelling framework how representations of the PLF of varying complexity impact ocean physics and ultimately marine production of nitrous oxide (N2O), a major greenhouse gas. We exploit global sensitivity simulations at 1∘ horizontal resolution over the last 2 decades (1999–2018), coupling ocean, sea ice and marine biogeochemistry. The representation of the PLF impacts ocean heat uptake and temperature of the first 300 m of the tropical ocean. Temperature anomalies due to an incomplete PLF representation drive perturbations of ocean stratification, dynamics and oxygen concentration. These perturbations translate into different projection pathways for N2O production depending on the choice of the PLF representation. The oxygen concentration in the North Pacific oxygen-minimum zone is overestimated in model runs with an incomplete representation of the PLF, which results in an underestimation of local N2O production. This leads to important regional differences of sea-to-air N2O fluxes: fluxes are enhanced by up to 24 % in the South Pacific and South Atlantic subtropical gyres but reduced by up to 12 % in oxygen-minimum zones of the Northern Hemisphere. Our results, based on a global ocean–biogeochemical model at CMIP6 ... |
format |
Article in Journal/Newspaper |
author |
Berthet, Sarah Jouanno, Julien Séférian, Roland Gehlen, Marion Llovel, William |
spellingShingle |
Berthet, Sarah Jouanno, Julien Séférian, Roland Gehlen, Marion Llovel, William How does the phytoplankton–light feedback affect the marine N2O inventory? |
author_facet |
Berthet, Sarah Jouanno, Julien Séférian, Roland Gehlen, Marion Llovel, William |
author_sort |
Berthet, Sarah |
title |
How does the phytoplankton–light feedback affect the marine N2O inventory? |
title_short |
How does the phytoplankton–light feedback affect the marine N2O inventory? |
title_full |
How does the phytoplankton–light feedback affect the marine N2O inventory? |
title_fullStr |
How does the phytoplankton–light feedback affect the marine N2O inventory? |
title_full_unstemmed |
How does the phytoplankton–light feedback affect the marine N2O inventory? |
title_sort |
how does the phytoplankton–light feedback affect the marine n2o inventory? |
publisher |
Copernicus GmbH |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00836/94755/102236.pdf https://archimer.ifremer.fr/doc/00836/94755/102237.pdf https://archimer.ifremer.fr/doc/00836/94755/102238.pdf https://archimer.ifremer.fr/doc/00836/94755/102239.pdf https://doi.org/10.5194/esd-14-399-2023 https://archimer.ifremer.fr/doc/00836/94755/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Earth System Dynamics (2190-4987) (Copernicus GmbH), 2023-04-12 , Vol. 14 , N. 2 , P. 399-412 |
op_relation |
https://archimer.ifremer.fr/doc/00836/94755/102236.pdf https://archimer.ifremer.fr/doc/00836/94755/102237.pdf https://archimer.ifremer.fr/doc/00836/94755/102238.pdf https://archimer.ifremer.fr/doc/00836/94755/102239.pdf doi:10.5194/esd-14-399-2023 https://archimer.ifremer.fr/doc/00836/94755/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/esd-14-399-2023 |
container_title |
Earth System Dynamics |
container_volume |
14 |
container_issue |
2 |
container_start_page |
399 |
op_container_end_page |
412 |
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1768375048611037184 |