Fiacconi, S. and Pendesini, M. and Cassardo, C. and Frustaci, G. (1997) Validation of a method for the determination of the sensible-heat flux with Sodar data in free convection cases. Il nuovo cimento C, 20 C (4). pp. 577-594. ISSN 1826-9885
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Abstract
A simple method to determine the value of the ground sensible-heat flux using Sodar data is presented and validated. The measurement of the variance of the wind velocity components gives us an estimate of the intensity of the atmospheric turbulence; the local value of variance of the vertical wind velocity s2w depends on the efficiency of thermal and mechanical turbulence production. The portion of the atmospheric boundary layer, where turbulent kinetic energy is prevalently produced by buoyancy forces, is characterised by profiles of s3w Oz and of (sensible-) heat flux which decrease linearly with height. The extrapolation to the ground of the former profile gives an estimate of the value of sensible-heat flux at the surface. The validation of the results is performed by comparison of the energy involved in the development of convective episodes calculated, over the same time interval, from sensible-heat flux at the surface with that derived from potential temperature profiles relative to two successive radio soundings. When perturbative processes like, for example, rise up of breezes, are absent, the estimates of energies are in excellent agreement, being the angular coefficient of regression line 1.01 and the linear correlation coefficient 0.93.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Meteorology |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.5 Meteorologia (Classificare qui l'atmosfera) (Classificare la previsione e le previsioni di specifici fenomeni meteorologici in 551.64; classificare la Micrometeorologia in 551.66) |
| Depositing User: | Marina Spanti |
| Date Deposited: | 06 Feb 2018 13:26 |
| Last Modified: | 06 Feb 2018 13:26 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/12169 |
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