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| Titel |
Influence of stability on the flux-profile relationships for wind speed, Φm, and temperature, Φh, for the stable atmospheric boundary layer |
| VerfasserIn |
C. Yagüe, S. Viana, G. Maqueda, J. M. Redondo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 13, no. 2 ; Nr. 13, no. 2 (2006-06-21), S.185-203 |
| Datensatznummer |
250011736
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| Publikation (Nr.) |
 copernicus.org/npg-13-185-2006.pdf |
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| Zusammenfassung |
| 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, Φm, and heat, Φh.
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
Φm and Φh with increasing stability parameter ζ=z/Λ, 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 Φm and Φh are related to the gradient Richardson
number, Ri, a different behaviour is found, which could indicate that
the transfer of momentum is greater than that of heat for high Ri. The
range of validity of these linear functions is discussed in terms of the
physical aspects of turbulent intermittent mixing. |
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