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A generalized scaling for convective shear flows
Springer Science and Business Media LLC - Tập 70 - Trang 51-78 - 1994
During the last two decades, different scalings for convective boundary layer (CBL) turbulence have been proposed. For the shear-free regime, Deardorff (1970) introduced convective velocity and temperature scales based on the surface potential temperature flux,Q
s
, the buoyancy parameter, β, and the time-dependent boundary-layer depth,h. Wyngaard (1983) has prop...... hiện toàn bộ
Temperature structure parameter measurements using differential temperature sensors
Springer Science and Business Media LLC - Tập 23 - Trang 307-315 - 1982
The comparison of C
infT
sup2
estimates in the atmospheric boundary layer, from spectral and differential temperature (δT) measurements, is discussed. Measurements of C
infT
sup2
using these two methods are compared and the differences between the two are shown to be due to low-frequency enh...... hiện toàn bộ
Some characteristics of the PBL over the ocean during the Indian summer monsoon
Springer Science and Business Media LLC - Tập 19 - Trang 235-247 - 1980
Data collected during the Indo-Soviet Monsoon-77 expedition are used to determine quadratic expressions for the universal constants A and B, as functions of the stability parameter, Μ. A quadratic expression has also been obtained for u
*, in terms of the surface wind u
s. It is shown, from the mean values of q and θ
E
, that the entire area covered by the expedit...... hiện toàn bộ
Evaluation of an alternative method for numerically modeling nonhydrostatic flows over irregular terrain
Springer Science and Business Media LLC - Tập 44 - Trang 181-206 - 1988
Modeling nonhydrostatic atmospheric flow requires the solution of the vertical equation of motion and a prognostic or diagnostic equation for pressure. If the nonhydrostatic components of the flow are relatively small, they can be approximated and incorporated into a purely hydrostatic model, which usually is conceptually simpler and computationally more efficient. A method to do this for a linear...... hiện toàn bộ
Influence of surface heterogeneity on scalar dissimilarity in the roughness sublayer
Springer Science and Business Media LLC - Tập 122 Số 1 - Trang 149-165 - 2007
While it is generally known that surface heterogeneity weakens the application of Monin–Obukhov similarity (MOS), few studies have investigated how seasonal changes in the degree of surface heterogeneity at a particular site may influence the validity of the similarity application. Exploiting seasonal changes in forest function associated with senescence, we conduct a unique evaluation of the effe...... hiện toàn bộ
Spatial Variation of Statistical and Spectral Properties of the Stream Wise and Wall-Normal Velocity Fluctuations in the Near-Neutral Atmospheric Surface Layer
Springer Science and Business Media LLC - Tập 173 - Trang 223-242 - 2019
Based on high-quality near-neutral atmospheric-surface-layer (ASL) data obtained from an observational site located in flat desert and existing experimental results for a friction Reynolds number Reτ < 106, the spatial variation of the streamwise and wall-normal velocity statistics and the Reτ dependence of the scaling parameters are investigated. The near-neutral ASL results show that, for Reτ > ...... hiện toàn bộ
A Lagrangian Stochastic Model for Sea-Spray Evaporation in the Atmospheric Marine Boundary Layer
Springer Science and Business Media LLC - - 2010
The dispersion of heavy particles subjected to a turbulent forcing is often simulated with Lagrangian stochastic models. Although these models have been employed successfully over land, the implementation of traditional LS models in the marine boundary layer is significantly more challenging. We present an adaptation of traditional Lagrangian stochastic models to the atmospheric marine boundary la...... hiện toàn bộ
Introduction to Obukhov's paper on ‘turbulence in an atmosphere with a non-uniform temperature’
Springer Science and Business Media LLC - Tập 2 - Trang 3-6 - 1971
Improving Numerical Dispersion Modelling in Built Environments with Data Assimilation Using the Iterative Ensemble Kalman Smoother
Springer Science and Business Media LLC - Tập 179 - Trang 209-240 - 2021
Air-pollution modelling at the local scale requires accurate meteorological inputs such as from the velocity field. These meteorological fields are generally simulated with microscale models (here Code_Saturne), which are forced with boundary conditions provided by larger scale models or observations. Local atmospheric simulations are very sensitive to the boundary conditions, whose accurate estim...... hiện toàn bộ
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