On the u⋆−U Relationship in the Stable Atmospheric Boundary Layer over Arctic Sea Ice

Chechin, Dmitry

doi:10.3390/atmos12050591

Cited by 3 publications

(1 citation statement)

References 48 publications

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“…(2016) named such a transition as HOckey‐Stick Transition (HOST). Similar findings have been reported in follow‐up studies using observations and numerical models (Acevedo et al., 2019; Chechin, 2021; Maroneze et al., 2019). It is suggested that the transition is due to changes in the coupling states of the surface layer (Acevedo et al., 2016; Sun et al., 2016, 2020), which are modulated by coherent eddies across the layers.…”

Section: Introductionsupporting

confidence: 88%

A Non‐Dimensional Index for Characterizing the Transition of Turbulence Regimes in Stable Atmospheric Boundary Layers

Shao,

Zhang,

et al. 2023

Geophysical Research Letters

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The transition from moderate to weak turbulence regimes remains a grand challenge for stable boundary layer parameterizations in weather and climate models. In this study, a critical horizontal Froude number (≈0.28) is proposed to characterize such a transition, which corresponds to the development of quasi two‐dimensional pancake vortices. Traditionally defined stability parameters corresponding to the critical horizontal Froude number are estimated and are consistent with values in the literature. The critical horizontal Froude number can recover previously used height‐ and site‐dependent mean wind speed thresholds. These findings offer a way to constrain the validity range of Monin‐Obukhov similarity theory in numerical models for weather and pollutants dispersion.

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Section: Introductionsupporting

confidence: 88%

A Non‐Dimensional Index for Characterizing the Transition of Turbulence Regimes in Stable Atmospheric Boundary Layers

Shao,

Zhang,

et al. 2023

Geophysical Research Letters

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A Novel Similarity Approach for Describing the Bulk Shear in the Atmospheric Surface Layer

Urbancic,

Stiperski,

Holtslag

et al. 2024

Boundary-Layer Meteorol

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The Monin–Obukhov Similarity Theory (MOST) is a cornerstone of boundary layer meteorology and the basis of most parameterizations of the atmospheric surface layer. Due to its significance for observations and modelling, we generalize the dimensional analysis of MOST by considering the bulk gradient directly, enabling the study of any sublayer of the atmospheric surface layer. This results in a family of similarity relations describing all gradients from the local gradient to the full-layer bulk gradient. By applying the profiles derived from the law-of-the-wall and MOST, we are able to derive analytic expressions for this family of similarity relations. Under stable conditions, we discover that the log-linear profile of Businger–Dyer generalizes from the local to the bulk shear where the slope is dependent on the choice of the layer. The simplicity of the general log-linear relation allows for estimating the influence of stability on the non-dimensional gradients. It is shown that bulk gradients are less sensitive to stability than the local gradient. By correctly filtering cases where the full-layer bulk gradient is influenced by stability, we demonstrate that MOST is compatible with the Hockey-Stick Transition. For unstable conditions, the Kader and Yaglom (J Fluid Mech 212(151):637-662, 1990) model represents the local gradient well but was not successful in representing the bulk gradient, demonstrating the need for further analysis of scaling relations for the unstable atmospheric surface layer.

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Influence of Stability and Surface Roughness on Turbulence during the Stable Atmospheric Variability and Transport (SAVANT) Field Campaign

Bhimireddy

Wang

Hiscox

et al. 2022

Journal of Applied Meteorology and Climatology

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Harvesting of crops in a weakly sloping Midwestern field during the Stable Atmospheric Variability and Transport (SAVANT) observation campaign allowed for a systematic investigation of the influence of surface roughness and static stability magnitude on the applicability of the Monin–Obukhov similarity (MOST) and hockey-stick transition (HOST) theories during stable boundary layer periods. We analyze momentum flux and turbulent velocity scale VTKE in three regimes, defined using the gradient Richardson number Ri and flux Richardson number Rif as regime 1 (0 < Ri ≤ 0.1 and 0 < Rif ≤ 0.1), regime 2 (0.1 < Ri ≤ 0.23 and 0.1 < Rif ≤ 0.23), and regime 3 (both Ri and Rif > 0.23). After harvest, in regime 1, stability varied from near-neutral to weakly stable and both MOST and HOST were applicable to estimate the momentum fluxes and VTKE as a function of mean wind speed. In regime 2, the momentum flux deviated from the MOST linear relationship as stability increased. In regimes 1 and 2, a HOST-defined threshold wind speed Vs was identified beyond which VTKE increased linearly with wind speed at a rate of 0.26 for all observation heights. Below this threshold wind speed, VTKE behaved independent of mean wind and observation heights. Alternatively, for preharvest periods, MOST was applicable in regimes 1 and 2 for all heights and HOST was applicable with reduced Vs for heights above the crop layer. Regime 3 during pre- and postharvest consisted of strongly stable periods and very weak to weak winds, where MOST was found to be invalid and VTKE remained low and independent of wind speed. The results suggest that roughness due to crops enhances the turbulence generation at lower wind speeds.

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On the u⋆−U Relationship in the Stable Atmospheric Boundary Layer over Arctic Sea Ice

Cited by 3 publications

References 48 publications

A Non‐Dimensional Index for Characterizing the Transition of Turbulence Regimes in Stable Atmospheric Boundary Layers

A Non‐Dimensional Index for Characterizing the Transition of Turbulence Regimes in Stable Atmospheric Boundary Layers

A Novel Similarity Approach for Describing the Bulk Shear in the Atmospheric Surface Layer

Influence of Stability and Surface Roughness on Turbulence during the Stable Atmospheric Variability and Transport (SAVANT) Field Campaign

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