ISSN:
1573-1472
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Geologie und Paläontologie
,
Physik
Notizen:
Abstract The turbulent heat flux is usually assumed constant with height in the atmospheric surface layer. The validity of this hypothesis is known to be questionable, due to a possible variation along the vertical of the infrared radiative heat flux. This problem is approached theoretically, using semi-empirical expressions for emissivities, and assuming logarithmic temperature and humidity profiles. A first approximation of the radiative heat flux divergence is thus obtained analytically, as a function of the surface layer parameters. Numerical application to the case of an underlying water surface reveals appreciable variations of the radiative and turbulent heat fluxes in the first ten meters of the atmosphere, especially when wind velocity is low and humidity is high. These preliminary results are presented here for discussion. If accepted, they could lead to a reinterpretation of some experimental data, and should permit an extension of turbulent transfer theories to the case of a variable heat flux.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02186030
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