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...
Published in: | Biogeosciences |
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Language: | English |
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Copernicus Publications (EGU)
2020
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Online Access: | https://oceanrep.geomar.de/id/eprint/48978/ https://oceanrep.geomar.de/id/eprint/48978/1/bg-17-3057-2020.pdf https://oceanrep.geomar.de/id/eprint/48978/2/bg-17-3057-2020-supplement.pdf https://www.biogeosciences.net/17/3057/2020/bg-17-3057-2020.html https://doi.org/10.5194/bg-17-3057-2020 |
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ftoceanrep:oai:oceanrep.geomar.de:48978 2023-05-15T14:07:41+02:00 One size fits all? Calibrating an ocean biogeochemistry model for different circulations Kriest, Iris Kähler, Paul Koeve, Wolfgang Kvale, Karin F. Sauerland, Volkmar Oschlies, Andreas 2020-06-18 text https://oceanrep.geomar.de/id/eprint/48978/ https://oceanrep.geomar.de/id/eprint/48978/1/bg-17-3057-2020.pdf https://oceanrep.geomar.de/id/eprint/48978/2/bg-17-3057-2020-supplement.pdf https://www.biogeosciences.net/17/3057/2020/bg-17-3057-2020.html https://doi.org/10.5194/bg-17-3057-2020 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/48978/1/bg-17-3057-2020.pdf https://oceanrep.geomar.de/id/eprint/48978/2/bg-17-3057-2020-supplement.pdf Kriest, I. , Kähler, P., Koeve, W. , Kvale, K. F. , Sauerland, V. and Oschlies, A. (2020) One size fits all? Calibrating an ocean biogeochemistry model for different circulations. Open Access Biogeosciences (BG), 17 . pp. 3057-3082. DOI 10.5194/bg-17-3057-2020 <https://doi.org/10.5194/bg-17-3057-2020>. doi:10.5194/bg-17-3057-2020 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2020 ftoceanrep https://doi.org/10.5194/bg-17-3057-2020 2023-04-07T15:49:25Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Southern Ocean Biogeosciences 17 12 3057 3082 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
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 |
Kriest, Iris Kähler, Paul Koeve, Wolfgang Kvale, Karin F. Sauerland, Volkmar Oschlies, Andreas |
spellingShingle |
Kriest, Iris Kähler, Paul Koeve, Wolfgang Kvale, Karin F. Sauerland, Volkmar Oschlies, Andreas One size fits all? Calibrating an ocean biogeochemistry model for different circulations |
author_facet |
Kriest, Iris Kähler, Paul Koeve, Wolfgang Kvale, Karin F. Sauerland, Volkmar Oschlies, Andreas |
author_sort |
Kriest, Iris |
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 (EGU) |
publishDate |
2020 |
url |
https://oceanrep.geomar.de/id/eprint/48978/ https://oceanrep.geomar.de/id/eprint/48978/1/bg-17-3057-2020.pdf https://oceanrep.geomar.de/id/eprint/48978/2/bg-17-3057-2020-supplement.pdf https://www.biogeosciences.net/17/3057/2020/bg-17-3057-2020.html https://doi.org/10.5194/bg-17-3057-2020 |
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_relation |
https://oceanrep.geomar.de/id/eprint/48978/1/bg-17-3057-2020.pdf https://oceanrep.geomar.de/id/eprint/48978/2/bg-17-3057-2020-supplement.pdf Kriest, I. , Kähler, P., Koeve, W. , Kvale, K. F. , Sauerland, V. and Oschlies, A. (2020) One size fits all? Calibrating an ocean biogeochemistry model for different circulations. Open Access Biogeosciences (BG), 17 . pp. 3057-3082. DOI 10.5194/bg-17-3057-2020 <https://doi.org/10.5194/bg-17-3057-2020>. doi:10.5194/bg-17-3057-2020 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
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 |
_version_ |
1766279708761128960 |