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• W43719883 abstract "The relevance of surface quasi-geostrophic dynamics (SQG) to the upper ocean and the atmospheric tropopause has been recently demonstrated in a wide range of conditions. Within this context, the properties of SQG in terms of kinetic energy (KE) transfers are revisited and further explored. Two well-known properties of SQG in spectral space are (i) the identity between surface velocity and density spectra (when appropriately scaled) and (ii) the existence of a forward cascade for surface density variance. Here we show numerically and analytically that (i) and (ii) do not imply a forward cascade of surface KE (through advection). On the contrary, advection by the geostrophic flow primarily induces an inverse cascade of surface KE on a large range of scales. This spectral flux is locally compensated for by a KE source, linked to surface frontogenesis, that is interpreted as a conversion of potential to kinetic energy. The subsequent spectral budget resembles those exhibited by more complex systems (primitive equation or Boussinesq models) and observations, which strengthens the relevance of SQG for the description of ocean/atmosphere dynamics near vertical boundaries. The main weakness of SQG however is in the small-scale range (scales smaller than 20-30km in the ocean) where it poorly represents the forward KE cascade observed in non-QG numerical simulations." @default.
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• W43719883 date "2007-01-01" @default.
• W43719883 modified "2023-10-18" @default.
• W43719883 title "Surface Kinetic Energy Transfer in SQG Flows" @default.
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