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- W2947122079 abstract "We present an analytical model reproducing literature‐based numerical simulations of the Marine Atmospheric Boundary Layer (MABL) over a Sea‐Surface Temperature (SST) front, with wind blowing from the cold to the warm side. Turbulence is parametrized through a varying diffusion coefficient with two critical features: it is parabolic in 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 through non‐dimensional numbers characterizing the relative importance of terms driving the momentum equation. A closed‐form expression of the vertically integrated wind divergence in the MABL is then obtained. The resulting divergence is linearly linked to the SST Laplacian and to the downwind SST gradient. This shows that the response of the MABL wind divergence to an SST front is highly dependent on its spatial scale. The coupling coefficients vary with the ratio of MABL height to turbulence strength, i.e. the inverse Ekman number. We further show different regimes in the rate of variation of the coupling coefficients, depending on the Ekman number value. This can result in qualitatively different vertical winds, having potential implications for the coupling of the MABL with the free troposphere." @default.
- W2947122079 created "2019-06-07" @default.
- W2947122079 creator A5008376154 @default.
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- W2947122079 date "2019-07-01" @default.
- W2947122079 modified "2023-10-18" @default.
- W2947122079 title "An analytical study of the atmospheric boundary‐layer flow and divergence over an SST front" @default.
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- W2947122079 doi "https://doi.org/10.1002/qj.3578" @default.
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