Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation
We quantify contemporary and preindustrial net air-sea CO2 fluxes by an Ensemble Kalman Filter assimilation of interior ocean observations and compare results with published estimates in the light of sensitivity to model transport and input data reconstructions. Four different published reconstructi...
Published in: | Global Biogeochemical Cycles |
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Language: | English |
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Online Access: | https://boris.unibe.ch/4529/1/2009GB003531.pdf https://boris.unibe.ch/4529/ |
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ftunivbern:oai:boris.unibe.ch:4529 2023-08-20T04:09:56+02:00 Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation Gerber, M. Joos, F. 2010 application/pdf https://boris.unibe.ch/4529/1/2009GB003531.pdf https://boris.unibe.ch/4529/ eng eng American Geophysical Union https://boris.unibe.ch/4529/ info:eu-repo/semantics/openAccess Gerber, M.; Joos, F. (2010). Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation. Global biogeochemical cycles, 24(3), n/a-n/a. Washington, D.C.: American Geophysical Union 10.1029/2009GB003531 <http://dx.doi.org/10.1029/2009GB003531> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2010 ftunivbern https://doi.org/10.1029/2009GB003531 2023-07-31T20:26:53Z We quantify contemporary and preindustrial net air-sea CO2 fluxes by an Ensemble Kalman Filter assimilation of interior ocean observations and compare results with published estimates in the light of sensitivity to model transport and input data reconstructions. Four different published reconstructions of anthropogenic carbon and the ΔCgasex tracer are assimilated into different versions of the Bern3D ocean model. The two tracers represent the components of dissolved inorganic carbon due to the anthropogenic perturbation and the air-sea gas exchange of preindustrial CO2. Contemporary air-sea fluxes for broad latitudinal bands are consistent with those from earlier ocean inversions and the observed air-sea CO2 partial pressure differences. We infer modest meridional transport rates of up to 0.5 GtC yr−1 for the preindustrial and the contemporary ocean and a small carbon transport across the equator. The anthropogenic perturbation offsets the preindustrial net sea-to-air flux yielding a weak contemporary carbon sink in the Southern Ocean (south of 44°S) of 0.15 ± 0.25 GtC yr−1. Preindustrial Southern Ocean outgassing varies by almost a factor of 2 among the four ΔCgasex reconstructions. Large differences in regional fluxes are found between an earlier ocean inversion using Green's function and this study for the same model and input data calculation. Systematic differences in assimilated and optimized ΔCgasex fields are large in both inversions, and the contemporary, anthropogenic, and preindustrial air-sea CO2 flux in the high-latitude and midlatitude Southern Hemisphere remains uncertain. Article in Journal/Newspaper Southern Ocean BORIS (Bern Open Repository and Information System, University of Bern) Southern Ocean Global Biogeochemical Cycles 24 3 n/a n/a |
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Open Polar |
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BORIS (Bern Open Repository and Information System, University of Bern) |
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ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Gerber, M. Joos, F. Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation |
topic_facet |
530 Physics |
description |
We quantify contemporary and preindustrial net air-sea CO2 fluxes by an Ensemble Kalman Filter assimilation of interior ocean observations and compare results with published estimates in the light of sensitivity to model transport and input data reconstructions. Four different published reconstructions of anthropogenic carbon and the ΔCgasex tracer are assimilated into different versions of the Bern3D ocean model. The two tracers represent the components of dissolved inorganic carbon due to the anthropogenic perturbation and the air-sea gas exchange of preindustrial CO2. Contemporary air-sea fluxes for broad latitudinal bands are consistent with those from earlier ocean inversions and the observed air-sea CO2 partial pressure differences. We infer modest meridional transport rates of up to 0.5 GtC yr−1 for the preindustrial and the contemporary ocean and a small carbon transport across the equator. The anthropogenic perturbation offsets the preindustrial net sea-to-air flux yielding a weak contemporary carbon sink in the Southern Ocean (south of 44°S) of 0.15 ± 0.25 GtC yr−1. Preindustrial Southern Ocean outgassing varies by almost a factor of 2 among the four ΔCgasex reconstructions. Large differences in regional fluxes are found between an earlier ocean inversion using Green's function and this study for the same model and input data calculation. Systematic differences in assimilated and optimized ΔCgasex fields are large in both inversions, and the contemporary, anthropogenic, and preindustrial air-sea CO2 flux in the high-latitude and midlatitude Southern Hemisphere remains uncertain. |
format |
Article in Journal/Newspaper |
author |
Gerber, M. Joos, F. |
author_facet |
Gerber, M. Joos, F. |
author_sort |
Gerber, M. |
title |
Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation |
title_short |
Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation |
title_full |
Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation |
title_fullStr |
Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation |
title_full_unstemmed |
Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation |
title_sort |
carbon sources and sinks from an ensemble kalman filter ocean data assimilation |
publisher |
American Geophysical Union |
publishDate |
2010 |
url |
https://boris.unibe.ch/4529/1/2009GB003531.pdf https://boris.unibe.ch/4529/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Gerber, M.; Joos, F. (2010). Carbon sources and sinks from an Ensemble Kalman Filter ocean data assimilation. Global biogeochemical cycles, 24(3), n/a-n/a. Washington, D.C.: American Geophysical Union 10.1029/2009GB003531 <http://dx.doi.org/10.1029/2009GB003531> |
op_relation |
https://boris.unibe.ch/4529/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2009GB003531 |
container_title |
Global Biogeochemical Cycles |
container_volume |
24 |
container_issue |
3 |
container_start_page |
n/a |
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n/a |
_version_ |
1774723704106778624 |