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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ftird:oai:ird.fr:fdi:010062266 2024-09-15T18:21:30+00:00 CMIP5 model intercomparison of freshwater budget and circulation in the North Atlantic /Deshayes, Julie Curry, R. Msadek, R. ATLANTIQUE NORD 2014 https://www.documentation.ird.fr/hor/fdi:010062266 EN eng https://www.documentation.ird.fr/hor/fdi:010062266 oai:ird.fr:fdi:010062266 Deshayes Julie, Curry R., Msadek R. CMIP5 model intercomparison of freshwater budget and circulation in the North Atlantic. 2014, 27 (9), p. 3298-3317 Atmosphere-ocean interaction Freshwater Climate models Model comparison Climate variability North Atlantic Oscillation text 2014 ftird 2024-08-15T05:57:41Z 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. Text North Atlantic North Atlantic oscillation IRD (Institute de recherche pour le développement): Horizon |
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IRD (Institute de recherche pour le développement): Horizon |
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English |
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Atmosphere-ocean interaction Freshwater Climate models Model comparison Climate variability North Atlantic Oscillation |
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Atmosphere-ocean interaction Freshwater Climate models Model comparison Climate variability North Atlantic Oscillation /Deshayes, Julie Curry, R. Msadek, R. 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 |
Text |
author |
/Deshayes, Julie Curry, R. Msadek, R. |
author_facet |
/Deshayes, Julie Curry, R. Msadek, R. |
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 |
publishDate |
2014 |
url |
https://www.documentation.ird.fr/hor/fdi:010062266 |
op_coverage |
ATLANTIQUE NORD |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010062266 oai:ird.fr:fdi:010062266 Deshayes Julie, Curry R., Msadek R. CMIP5 model intercomparison of freshwater budget and circulation in the North Atlantic. 2014, 27 (9), p. 3298-3317 |
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1810460096418807808 |