CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic
The subpolar North Atlantic is a center of variability of ocean properties, wind stress curl, and air-sea exchanges. Observations and hindcast simulations suggest that from the early 1970s to the mid-1990s the subpolar gyre became fresher while the gyre and meridional circulations intensified. This...
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ftarchimer:oai:archimer.ifremer.fr:31024 2023-05-15T17:28:35+02:00 CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic Deshayes, Julie Curry, Ruth Msadek, Rym 2014-05 application/pdf https://archimer.ifremer.fr/doc/00199/31024/29429.pdf https://doi.org/10.1175/JCLI-D-12-00700.1 https://archimer.ifremer.fr/doc/00199/31024/ eng eng Amer Meteorological Soc https://archimer.ifremer.fr/doc/00199/31024/29429.pdf doi:10.1175/JCLI-D-12-00700.1 https://archimer.ifremer.fr/doc/00199/31024/ 2014 American Meteorological Society info:eu-repo/semantics/openAccess restricted use Journal Of Climate (0894-8755) (Amer Meteorological Soc), 2014-05 , Vol. 27 , N. 9 , P. 3298-3317 Atmosphere-ocean interaction Freshwater Climate models Model comparison Climate variability North Atlantic Oscillation text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1175/JCLI-D-12-00700.1 2021-09-23T20:24:41Z The subpolar North Atlantic is a center of variability of ocean properties, wind stress curl, and air-sea exchanges. Observations and hindcast simulations suggest that from the early 1970s to the mid-1990s the subpolar gyre became fresher while the gyre and meridional circulations intensified. This is opposite to the relationship of freshening causing a weakened circulation, most often reproduced by climate models. The authors hypothesize that both these configurations exist but dominate on different time scales: a fresher subpolar gyre when the circulation is more intense, at interannual frequencies (configuration A), and a saltier subpolar gyre when the circulation is more intense, at longer periods (configuration B). Rather than going into the detail of the mechanisms sustaining each configuration, the authors' objective is to identify which configuration dominates and to test whether this depends on frequency, in preindustrial control runs of five climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5). To this end, the authors have developed a novel intercomparison method that enables analysis of freshwater budget and circulation changes in a physical perspective that overcomes model specificities. Lag correlations and a cross-spectral analysis between freshwater content changes and circulation indices validate the authors' hypothesis, as configuration A is only visible at interannual frequencies while configuration B is mostly visible at decadal and longer periods, suggesting that the driving role of salinity on the circulation depends on frequency. Overall, this analysis underscores the large differences among state-of-the-art climate models in their representations of the North Atlantic freshwater budget. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Journal of Climate 27 9 3298 3317 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Atmosphere-ocean interaction Freshwater Climate models Model comparison Climate variability North Atlantic Oscillation |
spellingShingle |
Atmosphere-ocean interaction Freshwater Climate models Model comparison Climate variability North Atlantic Oscillation Deshayes, Julie Curry, Ruth Msadek, Rym CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic |
topic_facet |
Atmosphere-ocean interaction Freshwater Climate models Model comparison Climate variability North Atlantic Oscillation |
description |
The subpolar North Atlantic is a center of variability of ocean properties, wind stress curl, and air-sea exchanges. Observations and hindcast simulations suggest that from the early 1970s to the mid-1990s the subpolar gyre became fresher while the gyre and meridional circulations intensified. This is opposite to the relationship of freshening causing a weakened circulation, most often reproduced by climate models. The authors hypothesize that both these configurations exist but dominate on different time scales: a fresher subpolar gyre when the circulation is more intense, at interannual frequencies (configuration A), and a saltier subpolar gyre when the circulation is more intense, at longer periods (configuration B). Rather than going into the detail of the mechanisms sustaining each configuration, the authors' objective is to identify which configuration dominates and to test whether this depends on frequency, in preindustrial control runs of five climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5). To this end, the authors have developed a novel intercomparison method that enables analysis of freshwater budget and circulation changes in a physical perspective that overcomes model specificities. Lag correlations and a cross-spectral analysis between freshwater content changes and circulation indices validate the authors' hypothesis, as configuration A is only visible at interannual frequencies while configuration B is mostly visible at decadal and longer periods, suggesting that the driving role of salinity on the circulation depends on frequency. Overall, this analysis underscores the large differences among state-of-the-art climate models in their representations of the North Atlantic freshwater budget. |
format |
Article in Journal/Newspaper |
author |
Deshayes, Julie Curry, Ruth Msadek, Rym |
author_facet |
Deshayes, Julie Curry, Ruth Msadek, Rym |
author_sort |
Deshayes, Julie |
title |
CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic |
title_short |
CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic |
title_full |
CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic |
title_fullStr |
CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic |
title_full_unstemmed |
CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic |
title_sort |
cmip5 model intercomparison of freshwater budget and circulation in the north atlantic |
publisher |
Amer Meteorological Soc |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00199/31024/29429.pdf https://doi.org/10.1175/JCLI-D-12-00700.1 https://archimer.ifremer.fr/doc/00199/31024/ |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Journal Of Climate (0894-8755) (Amer Meteorological Soc), 2014-05 , Vol. 27 , N. 9 , P. 3298-3317 |
op_relation |
https://archimer.ifremer.fr/doc/00199/31024/29429.pdf doi:10.1175/JCLI-D-12-00700.1 https://archimer.ifremer.fr/doc/00199/31024/ |
op_rights |
2014 American Meteorological Society info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1175/JCLI-D-12-00700.1 |
container_title |
Journal of Climate |
container_volume |
27 |
container_issue |
9 |
container_start_page |
3298 |
op_container_end_page |
3317 |
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1766121345688535040 |