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Analytical evaluation of mesoscale fluxes and pressure field

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Abstract

Terrain in natural areas is never homogeneous: there may be a variety of vegetation types and patches of vegetated and unvegetated areas which can modify the mesoscale atmospheric flow. Moreover, horizontal thermal inhomogeneities in the planetary boundary layer are a well known source of mesoscale circulation systems such as land and sea breezes, mountain-valley winds, and urban heat island circulations. Since those phenomena are not resolved in regional scale numerical models, therefore an analytic procedure able to evaluate the relative importance of mesoscale and turbulent heat fluxes associated with surface thermal heterogeneities is of crucial importance in the optic of developing a parameterization of mesoscale effects generated by these heterogeneities for use in larger scale models. In the present paper we analyze how small a horizontal variation in surface heating can be and still produce a significant mesoscale circulation, how the heat and momentum fluxes associated to mesoscale flows can penetrate deeply into the mid-troposphere, and how they modify tropospheric relevant climate parameters, such as the atmospheric static stability. In addition, we evaluate the terms of the pressure gradient force, nonlinear and linear, non-hydrostatic and hydrostatic, as function of time and space scales of the mesoscale flow. The present paper is mainly a review of analytical results, the numerical comparison and verification using RAMS is in progress.

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Authors and Affiliations

  1. Institute of Biometeorology, IBIMET-CNR, via Nizza 128, 00198, Rome, Italy

    Marina Baldi & Giovanni A. Dalu

  2. Department of Atmospheric Science, Colorado State University, 80523, Fort Collins, CO, U.S.A

    Marina Baldi, Giovanni A. Dalu & Roger A. Pielke Sr.

  3. Institute of Biometeorology, IBIMET-CNR, via G. Caproni, 8, 50145, Firenze, Italy

    Francesco Meneguzzo

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  1. Marina Baldi
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  2. Giovanni A. Dalu
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  3. Roger A. Pielke Sr.
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  4. Francesco Meneguzzo
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Baldi, M., Dalu, G.A., Pielke, R.A. et al. Analytical evaluation of mesoscale fluxes and pressure field. Environ Fluid Mech 5, 3–33 (2005). https://doi.org/10.1007/s10652-005-8089-6

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