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| Title: | On the bulk Richardson number and flux–profile relations in an atmospheric surface layer under weak wind stable conditions |
| Authors: | Sharan, Maithili
Rama Krishna, T V B P S
Aditi |
| Keywords: | Flux–profile relationships
Weak and strong winds
Bulk Richardson number
Stability functions
Atmospheric surface layer
Weak wind dispersion |
| Issue Date: | 2003 |
| Citation: | Atmospheric Environment, 37(26), 3681-3691 |
| Abstract: | For describing the surface fluxes in the atmospheric dispersion models, the commonly used linear universal similarity functions m and h for nondimensional wind and temperature profiles (J. Atmos. Sci. 28 (1971) 181; Boundary-Layer Meteorol. 7 (1974) 363) are analyzed under weak wind stable conditions. The stability parameter z/L (z is the height above the ground and L is the Obukhov length) is not known a priori. On the other hand, the bulk Richardson number (RiB) is readily available from profile measurements. Thus, a systematic mathematical analysis is carried out to analyze the applicability of the linear functions in terms of RiB. These linear functions are found to be valid as long as RiB is smaller than Prt γ/β2 where Prt is the turbulent Prandtl number and β and γ are constants appearing in the linear functions of m and h. The linear functional forms for m and h underestimate the Obukhov length resulting in the large value of the stability parameter when RiBPrt γ/β2 occurring in... |
| URI: | http://eprint.iitd.ac.in/dspace/handle/2074/1488 |
| Appears in Collections: | Atmospheric Sciences [CAS]
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