TITLE

Evaluation of Boundary Layer Similarity Theory for Stable Conditions in CASES-99

AUTHOR(S)
Ha, Kyung-Ja; Hyun, Yu-Kyung; Oh, Hyun-Mi; Kim, Kyung-Eak; Mahrt, Larry
PUB. DATE
October 2007
SOURCE
Monthly Weather Review;Oct2007, Vol. 135 Issue 10, p3474
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The Monin–Obukhov similarity theory and a generalized formulation of the mixing length for the stable boundary layer are evaluated using the Cooperative Atmosphere–Surface Exchange Study-1999 (CASES-99) data. The large-scale wind forcing is classified into weak, intermediate, and strong winds. Although the stability parameter, z/L, is inversely dependent on the mean wind speed, the speed of the large-scale flow includes independent influences on the flux–gradient relationship. The dimensionless mean wind shear is found to obey existing stability functions when z/L is less than unity, particularly for the strong and intermediate wind classes. For weak mean winds and/or strong stability (z/L > 1), this similarity theory breaks down. Deviations from similarity theory are examined in terms of intermittency. A case study of a weak-wind night indicates important modulation of the turbulence flux by mesoscale motions of unknown origin.
ACCESSION #
27098530

 

Related Articles

  • Parameterization of Sheared Convective Entrainment in the First-Order Jump Model: Evaluation Through Large-Eddy Simulation. Jianning Sun; Qiangjun Xu // Boundary-Layer Meteorology;Aug2009, Vol. 132 Issue 2, p279 

    In this note, two different approaches are used to estimate the entrainment-flux to surface-flux ratio for a sheared convective boundary layer (CBL); both are derived under the framework of the first-order jump model (FOM). That suggested by Sun and Wang (SW approach) has the advantage that...

  • Intermittent Bursting of Turbulence in a Stable Boundary Layer with Low-level Jet. Ohya, Yuji; Nakamura, Reina; Uchida, Takanori // Boundary-Layer Meteorology;Mar2008, Vol. 126 Issue 3, p349 

    The atmospheric stable boundary layer (SBL) with a low-level jet is simulated experimentally using a thermally stratified wind tunnel. The turbulence structure and flow characteristics are investigated by simultaneous measurements of velocity and temperature fluctuations and by flow...

  • Observations of Vertical Wind Shear Heterogeneity in Convective Boundary Layers. Markowski, Paul; Richardson, Yvette // Monthly Weather Review;Mar2007, Vol. 135 Issue 3, p843 

    Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular forecasting parameters such as vertical wind shear...

  • “Log-Chipper” Turbulence in the Convective Boundary Layer. Kimmel, Shari J.; Wyngaard, John C.; Otte, Martin J. // Journal of the Atmospheric Sciences;3/15/2002, Vol. 59 Issue 6, p1124 

    Turbulent fluctuations of a conservative scalar in the atmospheric boundary layer (ABL) can be generated by a scalar flux at the surface, a scalar flux of entrainment at the ABL top, and the "chewing up" of scalar variations on the mesoscale. The first two have been previously studied, while the...

  • An Improved Model for the Turbulent PBL. Cheng, Y.; Canuto, V. M.; Howard, A. M. // Journal of the Atmospheric Sciences;5/1/2002, Vol. 59 Issue 9, p1550 

    Second-order turbulence models of the Mellor and Yamada type have been widely used to simulate the planetary boundary layer (PBL). It is, however, known that these models have several deficiencies. For example, assuming the production of the turbulent kinetic energy equals its dissipation, they...

  • A New Dynamical Subgrid Model for the Planetary Surface Layer. Part II: Analytical Computation of Fluxes, Mean Profiles, and Variances. Dubrulle, Berengere; Laval, Jean-Philippe; Sullivan, Peter P. // Journal of the Atmospheric Sciences;2/15/2002, Vol. 59 Issue 4, p877 

    A new dynamical subgrid model for turbulent flow is used to derive the structure of the heat and momentum fluxes, mean wind and temperature profiles, and temperature and velocity variances, as a function of the Richardson number, in the surface layer of the planetary boundary layer. Analytical...

  • A New Dynamical Subgrid Model for the Planetary Surface Layer. Part I: The Model and A Priori Tests. Dubrulle, Berengere; Laval, Jean-Philippe; Sullivan, Peter P.; Werne, Joseph // Journal of the Atmospheric Sciences;2/15/2002, Vol. 59 Issue 4, p861 

    A new dynamical subgrid model for turbulent flow in the surface layer of the planetary boundary layer is presented. In this formulation, the flow is decomposed into small (subgrid) and large (resolved) scales in the spirit of large-eddy simulation. The subgrid model, however, is derived directly...

  • PARAMETERISING SUB-GRID SCALE VERTICAL TRANSPORT IN ATMOSPHERIC MODELS UNDER STATICALLY STABLE CONDITIONS. Delage, Yves // Boundary-Layer Meteorology;Jan1997, Vol. 82 Issue 1, p23 

    Five different formulations of the stability functions used for vertical turbulent transfer in atmospheric models are compared in a 1-D model of the nocturnal boundary layer. One of them has a critical value of the Richardson number around 0.2 and leads to the traditional log- linear profile,...

  • TURBULENT STRUCTURE AND LOCAL SIMILARITY IN THE TOWER LAYER OVER THE NANJING AREA. Xu Yltmao; Zhou Chaofu; Li Zhongkai; Zhang Wet // Boundary-Layer Meteorology;Jan1997, Vol. 82 Issue 1, p1 

    Local similarity of non-dimensional velocity and temperature standard deviations, σ_{i}/u_{*l} (i=u, v, w) and σ_{T}/T_{*l}, wind and temperature gradients φ_{m} and φ_{h} as well as the velocity spectrum is examined using turbulence observations on meteorological towers in...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics