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This research explores two methods for modeling the atmospheric boundary layer in numerical weather models.

February 5, 2026

Recommended methods for the treatment of the boundary layer in numerical models

Key Points

This research explores two methods for modeling the atmospheric boundary layer in numerical weather models.
Describes a modeling approach for the boundary layer above 20 meters.
Discusses parameterization of the entire boundary layer for efficiency.
Compares the accuracy and uncertainty of each method.
The first method provides detailed modeling but faces uncertainties in sub-grid scale processes.
The second method is more economical but less accurate, especially in dynamic regions like the inner tropics.

Abstract

Two possible methods of treating the atmospheric boundary layer in numerical models of the atmosphere are described, and their advantages and disadvantages discussed. It is assumed that the model is one which computes successive values of certain variables at grid points fixed in the horizontal and vertical. The first method calls for a modelling of the boundary layer above a level of, say, 20 m. In order to do this, the results of sub-grid scale mixing processes above 20 m must be modelled, and the uncertainties here are the weakest part of the procedure. The second method involves the parameterizing of the whole boundary layer, and is more economical in that it does not attempt to describe detailed structure. Its defects are that its accuracy is at the mercy of time and space variability, the proper taking account of which is as yet not possible; and that it is not valid in at least the inner tropics. Essentially both methods consist in interpolating on nomograms. The information contained in the nomograms has been distilled from the results of a number of Australian expeditions.

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