Stable water isotopes in the MITgcm
We present the first results of the implementation of stable water isotopes in the Massachusetts Institute of Technology general circulation model (MITgcm). The model is forced with the isotopic content of precipitation and water vapor from an atmospheric general circulation model (NCAR IsoCAM), whi...
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fttriple:oai:gotriple.eu:10670/1.mmdfxe 2023-05-15T15:10:12+02:00 Stable water isotopes in the MITgcm Voelpel, Rike Paul, Andre Krandick, Annegret Mulitza, Stefan Schulz, Michael https://doi.org/10.5194/gmd-10-3125-2017 https://archimer.ifremer.fr/doc/00662/77396/79002.pdf https://archimer.ifremer.fr/doc/00662/77396/79003.pdf https://archimer.ifremer.fr/doc/00662/77396/ en eng Copernicus Gesellschaft Mbh doi:10.5194/gmd-10-3125-2017 10670/1.mmdfxe https://archimer.ifremer.fr/doc/00662/77396/79002.pdf https://archimer.ifremer.fr/doc/00662/77396/79003.pdf https://archimer.ifremer.fr/doc/00662/77396/ other Archimer, archive institutionnelle de l'Ifremer Geoscientific Model Development (1991-959X) (Copernicus Gesellschaft Mbh), 2017-08 , Vol. 10 , N. 8 , P. 3125-3144 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.5194/gmd-10-3125-2017 2023-01-22T18:42:11Z We present the first results of the implementation of stable water isotopes in the Massachusetts Institute of Technology general circulation model (MITgcm). The model is forced with the isotopic content of precipitation and water vapor from an atmospheric general circulation model (NCAR IsoCAM), while the fractionation during evaporation is treated explicitly in the MITgcm. Results of the equilibrium simulation under pre-industrial conditions are compared to observational data and measurements of plankton tow records (the oxygen isotopic composition of planktic foraminiferal calcite). The broad patterns and magnitude of the stable water isotopes in annual mean seawater are well captured in the model, both at the sea surface as well as in the deep ocean. However, the surface water in the Arctic Ocean is not depleted enough, due to the absence of highly depleted precipitation and snowfall. A model-data mismatch is also recognizable in the isotopic composition of the seawater-salinity relationship in midlatitudes that is mainly caused by the coarse grid resolution. Deep-ocean characteristics of the vertical water mass distribution in the Atlantic Ocean closely resemble observational data. The reconstructed delta O-18(c) at the sea surface shows a good agreement with measurements. However, the model-data fit is weaker when individual species are considered and deviations are most likely attributable to the habitat depth of the foraminifera. Overall, the newly developed stable water isotope package opens wide prospects for long-term simulations in a paleoclimatic context. Text Arctic Arctic Ocean Foraminifera* Unknown Arctic Arctic Ocean Geoscientific Model Development 10 8 3125 3144 |
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geo envir Voelpel, Rike Paul, Andre Krandick, Annegret Mulitza, Stefan Schulz, Michael Stable water isotopes in the MITgcm |
topic_facet |
geo envir |
description |
We present the first results of the implementation of stable water isotopes in the Massachusetts Institute of Technology general circulation model (MITgcm). The model is forced with the isotopic content of precipitation and water vapor from an atmospheric general circulation model (NCAR IsoCAM), while the fractionation during evaporation is treated explicitly in the MITgcm. Results of the equilibrium simulation under pre-industrial conditions are compared to observational data and measurements of plankton tow records (the oxygen isotopic composition of planktic foraminiferal calcite). The broad patterns and magnitude of the stable water isotopes in annual mean seawater are well captured in the model, both at the sea surface as well as in the deep ocean. However, the surface water in the Arctic Ocean is not depleted enough, due to the absence of highly depleted precipitation and snowfall. A model-data mismatch is also recognizable in the isotopic composition of the seawater-salinity relationship in midlatitudes that is mainly caused by the coarse grid resolution. Deep-ocean characteristics of the vertical water mass distribution in the Atlantic Ocean closely resemble observational data. The reconstructed delta O-18(c) at the sea surface shows a good agreement with measurements. However, the model-data fit is weaker when individual species are considered and deviations are most likely attributable to the habitat depth of the foraminifera. Overall, the newly developed stable water isotope package opens wide prospects for long-term simulations in a paleoclimatic context. |
format |
Text |
author |
Voelpel, Rike Paul, Andre Krandick, Annegret Mulitza, Stefan Schulz, Michael |
author_facet |
Voelpel, Rike Paul, Andre Krandick, Annegret Mulitza, Stefan Schulz, Michael |
author_sort |
Voelpel, Rike |
title |
Stable water isotopes in the MITgcm |
title_short |
Stable water isotopes in the MITgcm |
title_full |
Stable water isotopes in the MITgcm |
title_fullStr |
Stable water isotopes in the MITgcm |
title_full_unstemmed |
Stable water isotopes in the MITgcm |
title_sort |
stable water isotopes in the mitgcm |
publisher |
Copernicus Gesellschaft Mbh |
url |
https://doi.org/10.5194/gmd-10-3125-2017 https://archimer.ifremer.fr/doc/00662/77396/79002.pdf https://archimer.ifremer.fr/doc/00662/77396/79003.pdf https://archimer.ifremer.fr/doc/00662/77396/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Foraminifera* |
genre_facet |
Arctic Arctic Ocean Foraminifera* |
op_source |
Archimer, archive institutionnelle de l'Ifremer Geoscientific Model Development (1991-959X) (Copernicus Gesellschaft Mbh), 2017-08 , Vol. 10 , N. 8 , P. 3125-3144 |
op_relation |
doi:10.5194/gmd-10-3125-2017 10670/1.mmdfxe https://archimer.ifremer.fr/doc/00662/77396/79002.pdf https://archimer.ifremer.fr/doc/00662/77396/79003.pdf https://archimer.ifremer.fr/doc/00662/77396/ |
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other |
op_doi |
https://doi.org/10.5194/gmd-10-3125-2017 |
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Geoscientific Model Development |
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8 |
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3125 |
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3144 |
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