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An analytical study of the atmospheric boundary layer flow and divergence over a SST front ArchiMer
Ayet, Alex; Redelsperger, Jean-luc.
We present an analytical model reproducing literature‐based numerical simulations of the Marine Atmospheric Boundary Layer (MABL) over a SST front, with wind blowing from the cold to the warm side. Turbulence is parameterised through a varying diffusion coefficient with two critical features: it is parabolic on the vertical and its mean value is decoupled from the MABL height (unlike an Ekman layer model). These two novel features are found essential to recover the internal structure of the MABL from numerical simulations. Different dynamical regimes are obtained and interpreted in terms of non‐dimensional numbers characterising the relative importance of terms driving the momentum equation. A closed‐form expression of the vertically integrated wind...
Tipo: Text Palavras-chave: Air-sea interaction; Analytical model; Boundary-layer flow; SST front.
Ano: 2019 URL:
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