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Provedor de dados:  ArchiMer
País:  France
Título:  Regionality and seasonality of submesoscale and mesoscale turbulence in the North Pacific Ocean
Autores:  Sasaki, Hideharu
Klein, Patrice
Sasai, Yoshikazu
Qiu, Bo
Data:  2017-09
Ano:  2017
Palavras-chave:  Submesoscale turbulence
Scale interactions
Mixed-layer instability
High-resolution simulations
North Pacific
Resumo:  The kinetic energy (KE) seasonality has been revealed by satellite altimeters in many oceanic regions. Question about the mechanisms that trigger this seasonality is still challenging. We address this question through the comparison of two numerical simulations. The first one, with a 1/10° horizontal grid spacing, 54 vertical levels, represents dynamics of physical scales larger than 50 km. The second one, with a 1/30° grid spacing, 100 vertical levels, takes into account the dynamics of physical scales down to 16 km. Comparison clearly emphasizes in the whole North Pacific Ocean, not only a significant KE increase by a factor up to three, but also the emergence of seasonal variability when the scale range 16–50 km (called submesoscales in this study) is taken into account. But the mechanisms explaining these KE changes display strong regional contrasts. In high KE regions, such the Kuroshio Extension and the western and eastern subtropics, frontal mixed-layer instabilities appear to be the main mechanism for the emergence of submesoscales in winter. Subsequent inverse kinetic energy cascade leads to the KE seasonality of larger scales. In other regions, in particular in subarctic regions, results suggest that the KE seasonality is principally produced by larger-scale instabilities with typical scales of 100 km and not so much by smaller-scale mixed-layer instabilities. Using arguments from geostrophic turbulence, the submesoscale impact in these regions is assumed to strengthen mesoscale eddies that become more coherent and not quickly dissipated, leading to a KE increase.
Tipo:  Text
Idioma:  Inglês

Editor:  Springer Heidelberg
Formato:  application/pdf
Fonte:  Ocean Dynamics (1616-7341) (Springer Heidelberg), 2017-09 , Vol. 67 , N. 9 , P. 1195-1216
Direitos:  Springer-Verlag GmbH Germany 2017


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