Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty
The modelling of the ocean global circulation induced magnetic field is affected by various uncertainties that originate from errors in the input data and from the model itself. The amount of aggregated uncertainties and their effect on the modelling of electromagnetic induction in the ocean is unkn...
Published in: | Journal of Geophysical Research: Oceans |
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_1478172 2023-05-15T13:35:24+02:00 Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty Irrgang, C. Saynisch, J. Thomas, M. 2016 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172_4/component/file_1529111/1478172.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC011633 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1002/2016JC011633 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172_4/component/file_1529111/1478172.pdf info:eu-repo/semantics/openAccess Journal of Geophysical Research info:eu-repo/semantics/article 2016 ftgfzpotsdam https://doi.org/10.1002/2016JC011633 2022-09-14T05:56:20Z The modelling of the ocean global circulation induced magnetic field is affected by various uncertainties that originate from errors in the input data and from the model itself. The amount of aggregated uncertainties and their effect on the modelling of electromagnetic induction in the ocean is unknown. For many applications, however, the knowledge of uncertainties in the modelling is essential. To investigate the uncertainty in the modelling of motional induction at the sea surface, simulation experiments are performed on the basis of different error scenarios and error covariance matrices. For these error scenarios, ensembles of an ocean general circulation model and an electromagnetic induction model are generated. This ensemble-based approach allows to estimate both the spatial distribution and temporal variation of the uncertainty in the ocean induced magnetic field. The largest uncertainty in the ocean induced magnetic field occurs in the area of the Antarctic Circumpolar Current. Local maxima reach values of up to 0.7 nano Tesla. The estimated global annual mean uncertainty in the ocean induced magnetic field ranges from 0.1 to 0.4 nT. The relative amount of uncertainty reaches up to 30 % of the signal strength with largest values in regions in the northern hemisphere. The major source of uncertainty is found to be introduced by wind stress from the atmospheric forcing of the ocean model. In addition, the temporal evolution of the uncertainty in the induced magnetic field shows distinct seasonal variations. Specific regions are identified which are robust with respect to the introduced uncertainties. This article is protected by copyright. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic The Antarctic Journal of Geophysical Research: Oceans 121 3 1866 1880 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
The modelling of the ocean global circulation induced magnetic field is affected by various uncertainties that originate from errors in the input data and from the model itself. The amount of aggregated uncertainties and their effect on the modelling of electromagnetic induction in the ocean is unknown. For many applications, however, the knowledge of uncertainties in the modelling is essential. To investigate the uncertainty in the modelling of motional induction at the sea surface, simulation experiments are performed on the basis of different error scenarios and error covariance matrices. For these error scenarios, ensembles of an ocean general circulation model and an electromagnetic induction model are generated. This ensemble-based approach allows to estimate both the spatial distribution and temporal variation of the uncertainty in the ocean induced magnetic field. The largest uncertainty in the ocean induced magnetic field occurs in the area of the Antarctic Circumpolar Current. Local maxima reach values of up to 0.7 nano Tesla. The estimated global annual mean uncertainty in the ocean induced magnetic field ranges from 0.1 to 0.4 nT. The relative amount of uncertainty reaches up to 30 % of the signal strength with largest values in regions in the northern hemisphere. The major source of uncertainty is found to be introduced by wind stress from the atmospheric forcing of the ocean model. In addition, the temporal evolution of the uncertainty in the induced magnetic field shows distinct seasonal variations. Specific regions are identified which are robust with respect to the introduced uncertainties. This article is protected by copyright. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Irrgang, C. Saynisch, J. Thomas, M. |
spellingShingle |
Irrgang, C. Saynisch, J. Thomas, M. Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty |
author_facet |
Irrgang, C. Saynisch, J. Thomas, M. |
author_sort |
Irrgang, C. |
title |
Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty |
title_short |
Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty |
title_full |
Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty |
title_fullStr |
Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty |
title_full_unstemmed |
Ensemble simulations of the magnetic field induced by global ocean circulation: Estimating the uncertainty |
title_sort |
ensemble simulations of the magnetic field induced by global ocean circulation: estimating the uncertainty |
publishDate |
2016 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172_4/component/file_1529111/1478172.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Journal of Geophysical Research |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016JC011633 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1002/2016JC011633 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1478172_4/component/file_1529111/1478172.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016JC011633 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
3 |
container_start_page |
1866 |
op_container_end_page |
1880 |
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1766065270285139968 |