One size fits all? Calibrating an ocean biogeochemistry model for different circulations
Global biogeochemical ocean models are often tuned to match the observed distributions and fluxes of inorganic and organic quantities. This tuning is typically carried out “by hand”. However, this rather subjective approach might not yield the best fit to observations, is closely linked to the circu...
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ftdoajarticles:oai:doaj.org/article:0c57180c260a48969fb0928a38cb90c9 2023-05-15T13:50:32+02:00 One size fits all? Calibrating an ocean biogeochemistry model for different circulations I. Kriest P. Kähler W. Koeve K. Kvale V. Sauerland A. Oschlies 2020-06-01T00:00:00Z https://doi.org/10.5194/bg-17-3057-2020 https://doaj.org/article/0c57180c260a48969fb0928a38cb90c9 EN eng Copernicus Publications https://www.biogeosciences.net/17/3057/2020/bg-17-3057-2020.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-17-3057-2020 1726-4170 1726-4189 https://doaj.org/article/0c57180c260a48969fb0928a38cb90c9 Biogeosciences, Vol 17, Pp 3057-3082 (2020) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/bg-17-3057-2020 2022-12-31T08:54:00Z Global biogeochemical ocean models are often tuned to match the observed distributions and fluxes of inorganic and organic quantities. This tuning is typically carried out “by hand”. However, this rather subjective approach might not yield the best fit to observations, is closely linked to the circulation employed and is thus influenced by its specific features and even its faults. We here investigate the effect of model tuning, via objective optimisation, of one biogeochemical model of intermediate complexity when simulated in five different offline circulations. For each circulation, three of six model parameters have been adjusted to characteristic features of the respective circulation. The values of these three parameters – namely, the oxygen utilisation of remineralisation, the particle flux parameter and potential nitrogen fixation rate – correlate significantly with deep mixing and ideal age of North Atlantic Deep Water (NADW) and the outcrop area of Antarctic Intermediate Waters (AAIW) and Subantarctic Mode Water (SAMW) in the Southern Ocean. The clear relationship between these parameters and circulation characteristics, which can be easily diagnosed from global models, can provide guidance when tuning global biogeochemistry within any new circulation model. The results from 20 global cross-validation experiments show that parameter sets optimised for a specific circulation can be transferred between similar circulations without losing too much of the model's fit to observed quantities. When compared to model intercomparisons of subjectively tuned, global coupled biogeochemistry–circulation models, each with different circulation and/or biogeochemistry, our results show a much lower range of oxygen inventory, oxygen minimum zone (OMZ) volume and global biogeochemical fluxes. Export production depends to a large extent on the circulation applied, while deep particle flux is mostly determined by the particle flux parameter. Oxygen inventory, OMZ volume, primary production and fixed-nitrogen turnover ... Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Biogeosciences 17 12 3057 3082 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 I. Kriest P. Kähler W. Koeve K. Kvale V. Sauerland A. Oschlies One size fits all? Calibrating an ocean biogeochemistry model for different circulations |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Global biogeochemical ocean models are often tuned to match the observed distributions and fluxes of inorganic and organic quantities. This tuning is typically carried out “by hand”. However, this rather subjective approach might not yield the best fit to observations, is closely linked to the circulation employed and is thus influenced by its specific features and even its faults. We here investigate the effect of model tuning, via objective optimisation, of one biogeochemical model of intermediate complexity when simulated in five different offline circulations. For each circulation, three of six model parameters have been adjusted to characteristic features of the respective circulation. The values of these three parameters – namely, the oxygen utilisation of remineralisation, the particle flux parameter and potential nitrogen fixation rate – correlate significantly with deep mixing and ideal age of North Atlantic Deep Water (NADW) and the outcrop area of Antarctic Intermediate Waters (AAIW) and Subantarctic Mode Water (SAMW) in the Southern Ocean. The clear relationship between these parameters and circulation characteristics, which can be easily diagnosed from global models, can provide guidance when tuning global biogeochemistry within any new circulation model. The results from 20 global cross-validation experiments show that parameter sets optimised for a specific circulation can be transferred between similar circulations without losing too much of the model's fit to observed quantities. When compared to model intercomparisons of subjectively tuned, global coupled biogeochemistry–circulation models, each with different circulation and/or biogeochemistry, our results show a much lower range of oxygen inventory, oxygen minimum zone (OMZ) volume and global biogeochemical fluxes. Export production depends to a large extent on the circulation applied, while deep particle flux is mostly determined by the particle flux parameter. Oxygen inventory, OMZ volume, primary production and fixed-nitrogen turnover ... |
format |
Article in Journal/Newspaper |
author |
I. Kriest P. Kähler W. Koeve K. Kvale V. Sauerland A. Oschlies |
author_facet |
I. Kriest P. Kähler W. Koeve K. Kvale V. Sauerland A. Oschlies |
author_sort |
I. Kriest |
title |
One size fits all? Calibrating an ocean biogeochemistry model for different circulations |
title_short |
One size fits all? Calibrating an ocean biogeochemistry model for different circulations |
title_full |
One size fits all? Calibrating an ocean biogeochemistry model for different circulations |
title_fullStr |
One size fits all? Calibrating an ocean biogeochemistry model for different circulations |
title_full_unstemmed |
One size fits all? Calibrating an ocean biogeochemistry model for different circulations |
title_sort |
one size fits all? calibrating an ocean biogeochemistry model for different circulations |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/bg-17-3057-2020 https://doaj.org/article/0c57180c260a48969fb0928a38cb90c9 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
Biogeosciences, Vol 17, Pp 3057-3082 (2020) |
op_relation |
https://www.biogeosciences.net/17/3057/2020/bg-17-3057-2020.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-17-3057-2020 1726-4170 1726-4189 https://doaj.org/article/0c57180c260a48969fb0928a38cb90c9 |
op_doi |
https://doi.org/10.5194/bg-17-3057-2020 |
container_title |
Biogeosciences |
container_volume |
17 |
container_issue |
12 |
container_start_page |
3057 |
op_container_end_page |
3082 |
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1766253659444740096 |