Effect of Baroclinicity on Wind Profiles and the Geostrophic Drag Law for the Convective Planetary Boundary Layer

Arya, S. Pal; Wyngaard, J. C.

doi:10.1175/1520-0469(1975)032<0767:eobowp>2.0.co;2

Cited by 117 publications

(99 citation statements)

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“…Specific humidity q and virtual potential temperature * are given by (Arya (1975), Zilitinkevich and Deardorff (1974), etc.) can be expressed by (3) (4) (5) where zi is the height of PBL to be described later, zo roughness height, and K Karman constant.…”

Section: Datamentioning

confidence: 87%

“…It has been, however, suggested that u*/ f is not a relevant height scale for unstable condition, and the direct use of the actual height of PBL has been recommended and introduced in the recent works. Arya (1975) dealt with the unstable condition separating the convective cases for which the lowest inversion base was adopted as the PBL height from those cases having no remarkable inversion for which the level of *-minimum is used as the PBL height. Melgarejo and Deardorff (1974) examined the similarity functions based on the PBL height taken as the level of the discontinuity in constancy of vertical profiles of temperature and humidity which appears nearly around the base of inversion layer.…”

Section: Introductionmentioning

confidence: 91%

“…However, at any cases the base of the inversion cap layer is traceable as the lowest limit of the strongest stable layer in the lower atmosphere, being adopted here as the height of PBL zi in this work. It is noted here that this height is different from the PBL height adopted by Hanna (1969) that is taken as the lowest level of temperature lapse rate discontinuity (HT in his notation) and that defined by Arya (1975) as the level of *-minimum for non-convective case.…”

Section: Datamentioning

confidence: 99%

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Observational Studies on the Similarity Functions C and D of the Convective Planetary Boundary Layer over the Ocean

Ishijima

1977

Journal of the Meteorological Society of Japan

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Under the provision of a time series of radiosonde and surface marine observations conducted by three research vessels, an investigation was made on the behaviour of the stability terms in heat and moisture transfer relations (similarity functions C and D for heat and moisture, respectively) for the convective condition of the planetary boundary layer.Similarity functions were analysed in terms of stratification parameter * it is found that the magnitude of C and its distribution versus * came out comparable with what other workers obtained and that the values of D are generally smaller than those of C for the entire range of * which might be due to the existing baroclinicity in the AMTEX area. It is also revealed that the value of C decreases and that of D increases as the baroclinicity weakens, suggesting that the values of C and D become close one another in the limit of decreasing baroclinicity. Distributions of C and D versus * are given by logarithmic expressions.The dependence upon * the ratio of the height of PBL height zi and the neutral height scale * was obtained.

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Section: Datamentioning

confidence: 87%

Section: Introductionmentioning

confidence: 91%

Section: Datamentioning

confidence: 99%

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Observational Studies on the Similarity Functions C and D of the Convective Planetary Boundary Layer over the Ocean

Ishijima

1977

Journal of the Meteorological Society of Japan

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“…insignificant horizontal gradients of surface temperature) then the conventional relation tan ϕG = −B0/[ln(u * /f z0)−A0] applies [27,28]. The lack of ϕG dependence can be interpreted as a sensible choice in the EWA model, given that the tan(ϕG) dependence is not proper for latitudes approaching the equator [29], and from the EWA's implicit assumption that (in the stability treatment) variations in dH would dominate those do to geostrophic turning. We also remind that near the equator the geostrophic wind becomes ill-defined (the boundary-layer depth implied by ln(u * /f /z0) becomes unphysically large), due to the dominant ABL balance arising not from the Coriolis force but from other mechanisms.…”

Section: A Appendix: Stability Perturbation Of Geostrophic Drag Law mentioning

confidence: 99%

Probabilistic stability and ‘tall’ wind profiles: theory and method for use in wind resource assessment

Kelly¹,

Troen²

2015

Wind Energy

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A model has been derived for calculating the effects of stability and the finite height of the planetary boundary layer upon the long-term mean wind profile. A practical implementation of this probabilistic extended similarity-theory model is made, including its incorporation within the European Wind Atlas (EWA) methodology for site-to-site application. Theoretical and practical implications of the EWA methodology are also derived and described, including unprecedented documentation of the theoretical framework encompassing vertical extrapolation, as well as some improvement to the methodology. Results of the modelling are shown for a number of sites, with discussion of the models' efficacy and the relative improvement shown by the new model, for situations where a user lacks local heat flux information, as well as performance of the new model using measured flux statistics. Further, the uncertainty in vertical extrapolation is characterized for the EWA model contained in standard (i.e. WAsP) wind resource assessment, as well as for the new model.

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“…Above the constant stress layers both the inflow and outflow cases reveal highly sheared environments. Under the well-mixed convective regime, * 32 wind shear is small, which agrees with the results of Arya and Wyngaard (1975) .…”

Section: So 31mentioning

confidence: 99%

The Relationship between Low-Level Convergence and Convective Precipitation in Illinois and South Florida.

Watson¹,

Holle²

1982

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Effect of Baroclinicity on Wind Profiles and the Geostrophic Drag Law for the Convective Planetary Boundary Layer

Cited by 117 publications

References 0 publications

Observational Studies on the Similarity Functions C and D of the Convective Planetary Boundary Layer over the Ocean

Observational Studies on the Similarity Functions C and D of the Convective Planetary Boundary Layer over the Ocean

Probabilistic stability and ‘tall’ wind profiles: theory and method for use in wind resource assessment

The Relationship between Low-Level Convergence and Convective Precipitation in Illinois and South Florida.

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