A comparison of near-surface potential temperature variance budgets for unstable atmospheric flows with contrasting vegetation cover flat surfaces and a gentle slope

Hang, Chaoxun; Nadeau, Daniel F.; Pardyjak, Eric R.; Parlange, M. B.

doi:10.1007/s10652-018-9647-z

Cited by 9 publications

(8 citation statements)

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“…However, comparatively less research has been carried out over non‐idealized terrain. These few studies have found that MOST derived functions may not hold over surfaces such as sparse and open canopies and heterogenous surfaces (van de Boer et al., 2014; Detto et al., 2008; Hang et al., 2018; Kroon & de Bruin, 1995; Lee, 2009). Few studies have consistently examined PTV across a wide variety of land cover types (G. Katul et al., 1995).…”

Section: Introductionmentioning

confidence: 99%

“…This lends some support to their supposed universal character. However, MOST is not readily generalizable for application in ESMs over more realistic landscapes, tall forests, and a variety of atmospheric conditions such as those associated with significant entrainment and mesoscale phenomenon (Asanuma & Brutsaert, 1999; van de Boer et al., 2014; Brunet, 2020; Hang et al., 2018; Harman, 2012; Kroon & de Bruin, 1995; Lloyd et al., 1991; Q. Li et al., 2018; Mcnaughton, 2006; Wilson, 2008). Previous literature examining the scaling relation between ζ and non‐dimensional flow statistics has focused on conditions that satisfy the assumptions of flat uniform surfaces so that the universal character suggested by MOST can be readily tested (Kader & Yaglom, 1990).…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Examining Parameterizations of Potential Temperature Variance Across Varied Landscapes for Use in Earth System Models

et al. 2022

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Earth system models (ESMs) and mesoscale models have come to employ increasingly complex parameterization schemes for the atmospheric boundary layer, requiring surface boundary conditions for numerous higher order turbulence statistics. Of particular interest is the potential temperature variance (PTV), which is used not only as a boundary condition itself but also to close boundary conditions of other statistics. The existing schemes in ESMs largely rely on the assumptions of Monin‐Obukhov similarity theory (MOST) and are not necessarily applicable over complex and heterogeneous surfaces where large scale circulations and roughness sub‐layer effects may cause deviations from MOST. The National Ecological Observation Network is used here to evaluate existing parameterizations for the surface boundary of PTV, note key deficiencies, and explore possible remedies. The results indicate that existing schemes are acceptable over a variety of surface conditions provided the analysis of a priori filters out low frequency variability not associated with turbulent time scales. There was, however, significant inter‐site variability in observed similarity constants and a significant bias when compared to the textbook values of these parameters. Existing models displayed the poorest performance over heterogeneous sites and rough landscapes. Attempts to use canopy structure and surface roughness characteristics to improve the results confirmed a relation between these variables and PTV but failed to significantly improve the predictive power of the models. The results did not find strong evidence indicating that large scale circulations caused substantial deviations from textbook models, although additional analysis is required to assess their full impacts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Examining Parameterizations of Potential Temperature Variance Across Varied Landscapes for Use in Earth System Models

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“…The SI contains eight manuscripts with an emphasis on results from the MATERHORN program. The SI includes novel field-experiment [1,4,6,7] and laboratory-experiment results [10], as well as high-resolution [9] and mesoscale atmospheric simulation studies [2,8].…”

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confidence: 99%

“…Nadeau et al [7] present both valley-scale and turbulence results and find that the duration of the morning transition period is highly variable; they hypothesize that this variability is the result of the presence or absence of transport from large-scale eddies. Hang et al [6] present an in-depth study of the potential temperature variance equation during unstable periods over three different surfaces (two flat and one sloped) during MATERHORN. They found that the turbulent transport term acts as a sink in the near-surface layer at all three locations.…”

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Preface: Special issue on the MATERHORN program and complex terrain flows

Pardyjak

Leo

2020

Environ Fluid Mech

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Examining Parameterizations of Potential Temperature Variance Across Varied Landscapes for use in Earth System Models

Waterman

Bragg

Katul

et al. 2021

Preprint

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The atmospheric boundary layer (ABL) plays a fundamental role in the climate system due to its significance in bridging land surface fluxes of heat and water vapor to convection and cloud formation (Garratt, 1992;Huang & Margulis, 2010;Siqueira et al., 2009). The ABL is characterized by the coexistence of mechanically and thermally generated turbulence, which regulates mixing and transport properties and exchanges between the land surface and the lower atmosphere. The variances of turbulent quantities are of particular interest due to their emerging role in state-of-the-science Earth System Models (ESMs) and numerical weather prediction. They have accordingly received attention in the literature, although most of these studies have focused on the velocity variances. Comparatively few examine the potential temperature variance (PTV) and those that do often focus on flat homogeneous terrain (

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A comparison of near-surface potential temperature variance budgets for unstable atmospheric flows with contrasting vegetation cover flat surfaces and a gentle slope

Cited by 9 publications

References 51 publications

Examining Parameterizations of Potential Temperature Variance Across Varied Landscapes for Use in Earth System Models

Examining Parameterizations of Potential Temperature Variance Across Varied Landscapes for Use in Earth System Models

Preface: Special issue on the MATERHORN program and complex terrain flows

Examining Parameterizations of Potential Temperature Variance Across Varied Landscapes for use in Earth System Models

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