On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information]
Despite recent advances in ocean observing arrays and satellite sensors, there remains great uncertainty in the large-scale spatial variations of upper ocean salinity on the interannual to decadal timescales. Consonant with both broad-scale surface warming and the amplification of the global hydrolo...
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ftird:oai:ird.fr:fdi:010067906 2024-09-15T17:45:47+00:00 On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information] O'Kane, T.J. Monselesan, D.P. /Maes, Christophe PACIFIQUE ANTARCTIQUE 2016 https://www.documentation.ird.fr/hor/fdi:010067906 EN eng https://www.documentation.ird.fr/hor/fdi:010067906 oai:ird.fr:fdi:010067906 O'Kane T.J., Monselesan D.P., Maes Christophe. On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information]. 2016, 121 (6), p. 4128-4148 [+ 35 p.] text 2016 ftird 2024-08-15T05:57:41Z Despite recent advances in ocean observing arrays and satellite sensors, there remains great uncertainty in the large-scale spatial variations of upper ocean salinity on the interannual to decadal timescales. Consonant with both broad-scale surface warming and the amplification of the global hydrological cycle, observed global multidecadal salinity changes typically have focussed on the linear response to anthropogenic forcing but not on salinity variations due to changes in the static stability and or variability due to the intrinsic ocean or internal climate processes. Here, we examine the static stability and spatiotemporal variability of upper ocean salinity across a hierarchy of models and reanalyses. In particular, we partition the variance into time bands via application of singular spectral analysis, considering sea surface salinity (SSS), the Brunt Väisälä frequency (N2), and the ocean salinity stratification in terms of the stabilizing effect due to the haline part of N2 over the upper 500m. We identify regions of significant coherent SSS variability, either intrinsic to the ocean or in response to the interannually varying atmosphere. Based on consistency across models (CMIP5 and forced experiments) and reanalyses, we identify the stabilizing role of salinity in the tropics-typically associated with heavy precipitation and barrier layer formation, and the role of salinity in destabilizing upper ocean stratification in the subtropical regions where large-scale density compensation typically occurs. Text Antarc* Antarctique* 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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Despite recent advances in ocean observing arrays and satellite sensors, there remains great uncertainty in the large-scale spatial variations of upper ocean salinity on the interannual to decadal timescales. Consonant with both broad-scale surface warming and the amplification of the global hydrological cycle, observed global multidecadal salinity changes typically have focussed on the linear response to anthropogenic forcing but not on salinity variations due to changes in the static stability and or variability due to the intrinsic ocean or internal climate processes. Here, we examine the static stability and spatiotemporal variability of upper ocean salinity across a hierarchy of models and reanalyses. In particular, we partition the variance into time bands via application of singular spectral analysis, considering sea surface salinity (SSS), the Brunt Väisälä frequency (N2), and the ocean salinity stratification in terms of the stabilizing effect due to the haline part of N2 over the upper 500m. We identify regions of significant coherent SSS variability, either intrinsic to the ocean or in response to the interannually varying atmosphere. Based on consistency across models (CMIP5 and forced experiments) and reanalyses, we identify the stabilizing role of salinity in the tropics-typically associated with heavy precipitation and barrier layer formation, and the role of salinity in destabilizing upper ocean stratification in the subtropical regions where large-scale density compensation typically occurs. |
format |
Text |
author |
O'Kane, T.J. Monselesan, D.P. /Maes, Christophe |
spellingShingle |
O'Kane, T.J. Monselesan, D.P. /Maes, Christophe On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information] |
author_facet |
O'Kane, T.J. Monselesan, D.P. /Maes, Christophe |
author_sort |
O'Kane, T.J. |
title |
On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information] |
title_short |
On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information] |
title_full |
On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information] |
title_fullStr |
On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information] |
title_full_unstemmed |
On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information] |
title_sort |
on the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ supporting information] |
publishDate |
2016 |
url |
https://www.documentation.ird.fr/hor/fdi:010067906 |
op_coverage |
PACIFIQUE ANTARCTIQUE |
genre |
Antarc* Antarctique* |
genre_facet |
Antarc* Antarctique* |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010067906 oai:ird.fr:fdi:010067906 O'Kane T.J., Monselesan D.P., Maes Christophe. On the stability and spatiotemporal variance distribution of salinity in the upper ocean [+ Supporting information]. 2016, 121 (6), p. 4128-4148 [+ 35 p.] |
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1810493685686599680 |