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Influence of stability on the flux-profile relationships for wind speed, φ_m, and temperature, φ_h, for the stable atmospheric boundary layer



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Yagüe Anguis, Carlos and Viana, S. and Maqueda Burgos, Gregorio and Redondo, J. M. (2006) Influence of stability on the flux-profile relationships for wind speed, φ_m, and temperature, φ_h, for the stable atmospheric boundary layer. Nonlinear processes in geophysics, 13 (2). pp. 185-203. ISSN 1023-5809

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Official URL: http://dx.doi.org/10.5194/npg-13-185-2006


Data from SABLES98 experimental campaign have been used in order to study the influence of stability (from weak to strong stratification) on the flux-profile relationships for momentum, φ_m, and heat, φ_h. Measurements from 14 thermocouples and 3 sonic anemometers at three levels (5.8, 13.5 and 32 m) for the period from 10 to 28 September 1998 were analysed using the framework of the local-scaling approach (Nieuwstadt, 1984a; 1984b), which can be interpreted as an extension of the Monin-Obukhov similarity theory (Obukhov, 1946). The results show increasing values of φ_m and φ_h with increasing stability parameter ζ=z/3, up to a value of ζ≈1–2, above which the values remain constant. As a consequence of this levelling off in φm and φh for strong stability, the turbulent mixing is underestimated when linear similarity functions (Businger et al., 1971) are used to calculate surface fluxes of momentum and heat. On the other hand when φ_m and φ_h are related to the gradient Richardson number, R_i , a different behaviour is found, which could indicate that the transfer of momentum is greater than that of heat for high R_i . The range of validity of these linear functions is discussed in terms of the physical aspects of turbulent intermittent mixing.

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© Author(s) 2006. This work is licensed under a Creative Commons License. This research has been funded by the Spanish Ministry of Education and Science (projects CLI97-0343 and CGL2004-03109/CLI). We are also indebted to all the team participating in SABLES98 and Prof. Casanova, Director of the CIBA, for his kind help. Thanks are also due to Dr. Früh for his constructive remarks. Comments from Dr. Esau and the two anonymous referees are also appreciated.

Uncontrolled Keywords:Extended similarity theory; Bulk Richardson-number; Antarctic ice shelf; Surface-layer; Turbulence; Intermittency; Heat; Parameterization; Climatology; Hypotheses
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:37512
Deposited On:05 May 2016 13:24
Last Modified:10 Dec 2018 15:05

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