Large Eddy Simulations of Entrainment and Inversion Structure

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Presentation transcript:

Large Eddy Simulations of Entrainment and Inversion Structure Alison Fowler Supervisor: Ian Brooks

Convectively driven entrainment

Example of LES

The IMPORTANCE of the EZ The EZ is responsible for the growth of the ML The depth of the ML is important for determining concentrations of variables within, for example, pollution. Formation and distribution of clouds

Defining the EZ i) However, Entrainment is a localised event: these definitions are area averaged so may not be useful for fully understanding individual entrainment events. Davis, K. J., D. H. Lenshow, S. P. Oncley, C. Kiemle, G. Ehret, A. Giez, J. Mann, 1997: Role of entrainment in surface- atmosphere interactions over the boreal forest. J. Geophys. Res., 120, 219-230.

Defining the EZ ii) Brooks, I. M., 2003: Finding Boundary Layer Top: Application of a Wavelet Covariance Transform to Lidar Backscatter Profiles. J. Atmos. Ocean. Tech., 20, 1092-1105.

Comparison of Definitions Comparing relationship with the convective Richardson number : Large Ri => little turbulence, there will be no entrainment unless it is strongly influenced from below small Ri =>the interface is dynamically unstable and may become or remain turbulent entraining without any influence from large eddies bellow

Statistics of the EZ

Statistics of the EZ

Statistics of the EZ

Conclusions Definitions of the EZ using area-averaged profiles cannot help in understanding entrainment events The variability of the EZ top and bottom important for estimating Ri Ri important for understanding dynamics of BL and has been used in parameterizations of the entrainment velocity. Sullivan, P. P., C.-H. Moeng, B. Stevens, D. H. Lenshow and S. D. Mayor, 1998: Structure of the Entrainment Zone Capping the Convective Boundary Layer. J. Atmos. Sci,. 55, 3042-3064. Entrainment velocity is important in modelling cloud distribution and the budgets of pollution and heat.