Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 716-733 |
| Seitenumfang | 18 |
| Fachzeitschrift | Journal of the Atmospheric Sciences |
| Jahrgang | 71 |
| Ausgabenummer | 2 |
| Publikationsstatus | Veröffentlicht - 1 Feb. 2014 |
Abstract
Large-eddy simulations (LESs) of free-convective to near-neutral boundary layers are used to investigate the surface-layer turbulence. The article focuses on the Monin-Obukhov similarity theory (MOST) relationships that relate the structure parameters of temperature C2T and humidity C2q to the surface fluxes of sensible and latent heat, respectively. Moreover, the applicability of local free convection (LFC) similarity scaling is studied. The LES data suggest that the MOST function for C2T is universal. It is shown to be within the range of the functions proposed from measurement data. It is found that C2q follows MOST if entrainment of dry air from the free atmosphere is sufficiently small. In this case the similarity functions for C2T and C2q are identical. If entrainment is significant, dissimilarity between the transport of sensible heat and moisture is observed and C2q no longer follows MOST. In the free-convection limit the LFC similarity functions should collapse to universal constants. The LES data suggest values around 2.7, which is in agreement with the value proposed in the literature. As for MOST, the LFC similarity constant for C2q becomes nonuniversal if entrainment of dry air is significant. It is shown that LFC scaling is applicable even if shear production of turbulence is moderately high.
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- Erdkunde und Planetologie (insg.)
- Atmosphärenwissenschaften
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in: Journal of the Atmospheric Sciences, Jahrgang 71, Nr. 2, 01.02.2014, S. 716-733.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Monin–Obukhov Similarity Functions for the Structure Parameters of Temperature and Humidity in the Unstable Surface Layer
T2 - Results from High-Resolution Large-Eddy Simulations
AU - Maronga, Björn
N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/2/1
Y1 - 2014/2/1
N2 - Large-eddy simulations (LESs) of free-convective to near-neutral boundary layers are used to investigate the surface-layer turbulence. The article focuses on the Monin-Obukhov similarity theory (MOST) relationships that relate the structure parameters of temperature C2T and humidity C2q to the surface fluxes of sensible and latent heat, respectively. Moreover, the applicability of local free convection (LFC) similarity scaling is studied. The LES data suggest that the MOST function for C2T is universal. It is shown to be within the range of the functions proposed from measurement data. It is found that C2q follows MOST if entrainment of dry air from the free atmosphere is sufficiently small. In this case the similarity functions for C2T and C2q are identical. If entrainment is significant, dissimilarity between the transport of sensible heat and moisture is observed and C2q no longer follows MOST. In the free-convection limit the LFC similarity functions should collapse to universal constants. The LES data suggest values around 2.7, which is in agreement with the value proposed in the literature. As for MOST, the LFC similarity constant for C2q becomes nonuniversal if entrainment of dry air is significant. It is shown that LFC scaling is applicable even if shear production of turbulence is moderately high.
AB - Large-eddy simulations (LESs) of free-convective to near-neutral boundary layers are used to investigate the surface-layer turbulence. The article focuses on the Monin-Obukhov similarity theory (MOST) relationships that relate the structure parameters of temperature C2T and humidity C2q to the surface fluxes of sensible and latent heat, respectively. Moreover, the applicability of local free convection (LFC) similarity scaling is studied. The LES data suggest that the MOST function for C2T is universal. It is shown to be within the range of the functions proposed from measurement data. It is found that C2q follows MOST if entrainment of dry air from the free atmosphere is sufficiently small. In this case the similarity functions for C2T and C2q are identical. If entrainment is significant, dissimilarity between the transport of sensible heat and moisture is observed and C2q no longer follows MOST. In the free-convection limit the LFC similarity functions should collapse to universal constants. The LES data suggest values around 2.7, which is in agreement with the value proposed in the literature. As for MOST, the LFC similarity constant for C2q becomes nonuniversal if entrainment of dry air is significant. It is shown that LFC scaling is applicable even if shear production of turbulence is moderately high.
UR - http://www.scopus.com/inward/record.url?scp=84893825506&partnerID=8YFLogxK
U2 - 10.1175/JAS-D-13-0135.1
DO - 10.1175/JAS-D-13-0135.1
M3 - Article
AN - SCOPUS:84893825506
VL - 71
SP - 716
EP - 733
JO - Journal of the Atmospheric Sciences
JF - Journal of the Atmospheric Sciences
SN - 0022-4928
IS - 2
ER -