Structure function analysis and intermittency in the atmospheric boundary layer

Vindel, J.M.; Yagüe, Carlos; Redondo, J. M.

doi:10.5194/npg-15-915-2008

Cited by 40 publications

(30 citation statements)

References 31 publications

(36 reference statements)

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“…This underscores the large within-record variability for very stable conditions due to the influence of isolated mixing events on the record-averaged flux. The kurtosis is often used as a measure of the intermittency of the turbulence (Vindel et al 2008). The kurtosis of the heat and the momentum fluxes is greater than 10 for most of the very stable records (Fr < 1) and approaches 100 for some of the records where one or two events dominate the 6-h flux (Fig.…”

Section: Scale and Stability Dependence Of Turbulence Characteristicsmentioning

confidence: 99%

The Near-Calm Stable Boundary Layer

Mahrt

2011

Boundary-Layer Meteorol

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For the near-calm stable boundary layer, nominally 2-m mean wind speed <0.5 m s −1 , the time-average turbulent flux is dominated by infrequent mixing events. These events are related to accelerations associated with wave-like motions and other more complex small-scale motions. In this regime, the relationship between the fluxes and the weak mean flow breaks down. Such near-calm conditions are common at some sites. For very weak winds and strong stratification, the characteristics of the fluctuating quantities change slowly with increasing scale and the separation between the turbulence and non-turbulent motions can become ambiguous. Therefore, a new analysis strategy is developed based on the scale dependence of selected flow characteristics, such as the ratio of the fluctuating potential energy to the kinetic energy. In contrast to more developed turbulence, correlations between fluctuating quantities are small, and a significant heat flux is sometimes carried by very weak vertical motions with large temperature fluctuations. The relation of the flux events to small-scale increases of wind speed is examined. Large remaining uncertainties are noted.

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Section: Scale and Stability Dependence Of Turbulence Characteristicsmentioning

confidence: 99%

The Near-Calm Stable Boundary Layer

Mahrt

2011

Boundary-Layer Meteorol

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“…We have chosen the length of the scaling range (up to 30) in order to have a minimum number of points for the fit and to fulfil the ESS condition. The range extends along the smallest scales, covering the dissipation range and the last part of the inertial range (some characteristic scales as the Kolmogorov and integral scales can be seen in Vindel et al, 2008). A moving average of order 12 has also used for the scaling exponents, similarly to the temperature difference between 50 m and 0.22 m. There is a clear relationship between the values of the scaling exponents and the corresponding situation of stability and it is shown a different behaviour for ζ 2 (p<3) compared to ζ 5 (p>3).…”

Section: Data and Empirical Resultsmentioning

confidence: 99%

Application of a GOY model to atmospheric boundary layer data

Vindel

Yagüe

2009

Nonlin. Processes Geophys.

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Abstract. This article analyzes the possibility of applying a GOY theoretical model to atmospheric boundary layer data. Bearing this in mind, relative scaling exponents of velocity structure functions are used to compare the model with the data under study. In the model, these exponents are set based on two parameters (q and δ), which are appropriate to define the model that better features a certain atmospheric state.From these scaling exponents, the gap between 2-D and 3-D turbulence is observed in the model, depending on the fact that δ is higher or lower than unity, respectively. Atmospheric data corresponding to very different states of stratification stability have been analyzed. For convective or near-neutral situations (usually associated to 3-D turbulence), it is possible to find parameters q and δ to define a model that fits the measured data. More stable situations can be featured by GOY models with higher values of δ. However, it is clear that it is impossible to represent nocturnal situations of strong stable stratification (with a more similar behaviour to 2-D) with this type of model.

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“…Therefore, we deduce that there would be a relationship between the ABL processes which generate mixing and the overturn size and behaviour (for example, the terrain shape interacts with the ability of the ABL to produce local mixing very near the ground, and this could be affect overturns). This theme will need further field work where different conditions are met (combination of the boundary condition effects and of stability combining the 3-D and 2-D characteristics of scale-toscale direct and inverse cascades, intermittency of the forcing, and scale-to-scale stratified turbulence cascades (Vindel et al, 2008;Yagüe et al, 2006)). …”

Section: Discussionmentioning

confidence: 99%

Study of the overturning length scales at the Spanish planetary boundary layer

López

Cano

2016

Nonlin. Processes Geophys.

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Abstract. The focus of this paper is to analyse the behaviour of the maximum Thorpe displacement (d T ) max and the Thorpe scale L T at the atmospheric boundary layer (ABL), extending previous research with new data and improving our studies related to the novel use of the Thorpe method applied to ABL. The maximum Thorpe displacements vary between −900 and 950 m for the different field campaigns. The Thorpe scale L T ranges between 0.2 and 680 m for the different data sets which cover different stratified mixing conditions (turbulence shear-driven and convective regions). We analyse the relationship between (d T ) max and the Thorpe scale L T and we deduce that they verify a power law. We also deduce that there is a difference in exponents of the power laws for convective conditions and sheardriven conditions. These different power laws could identify overturns created under different mechanisms.

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Structure function analysis and intermittency in the atmospheric boundary layer

Cited by 40 publications

References 31 publications

The Near-Calm Stable Boundary Layer

The Near-Calm Stable Boundary Layer

Application of a GOY model to atmospheric boundary layer data

Study of the overturning length scales at the Spanish planetary boundary layer

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