Book contents
- Frontmatter
- Contents
- Contributors
- Editors' preface
- Keynote address to the 1977 Symposium SIR JAMES LIGHTHILL
- Part I The large-scale climatology of the tropical atmosphere
- Part II The summer monsoon over the Indian subcontinent and East Africa
- Part III The physics and dynamics of the Indian Ocean during the summer monsoon
- Part IV Some important mathematical modelling techniques
- 39 On the incorporation of orography into numerical prediction models
- 40 Vertical motion in the monsoon circulation
- 41 A one-dimensional model of the planetary boundary layer for monsoon studies
- 42 The use of empirical orthogonal functions for rainfall estimates
- 43 Applications of perturbation theory to problems of simulation of atmospheric processes
- Part V Storm surges and flood forecasting
- Index
41 - A one-dimensional model of the planetary boundary layer for monsoon studies
Published online by Cambridge University Press: 05 November 2011
- Frontmatter
- Contents
- Contributors
- Editors' preface
- Keynote address to the 1977 Symposium SIR JAMES LIGHTHILL
- Part I The large-scale climatology of the tropical atmosphere
- Part II The summer monsoon over the Indian subcontinent and East Africa
- Part III The physics and dynamics of the Indian Ocean during the summer monsoon
- Part IV Some important mathematical modelling techniques
- 39 On the incorporation of orography into numerical prediction models
- 40 Vertical motion in the monsoon circulation
- 41 A one-dimensional model of the planetary boundary layer for monsoon studies
- 42 The use of empirical orthogonal functions for rainfall estimates
- 43 Applications of perturbation theory to problems of simulation of atmospheric processes
- Part V Storm surges and flood forecasting
- Index
Summary
This chapter presents results obtained by numerical integration of a one-dimensional model of the planetary boundary layer above an oceanic surface. Wind hodographs are constructed for: (i) a constant eddy coefficient; and (ii) an eddy coefficient which depends on the mixing length. Starting with a set of given initial conditions, results are presented to compare this model with (a) a threedimensional model constructed by Sommeria (1977) and (b) the results of the Puerto Rico experiment of 1972 (Pennell and LeMone, 1974).
Introduction
It is recognized that boundary-layer studies are likely to play an important role in improving our understanding of the monsoon. In recent years, experimental data have been collected by the NCAR 1972 Puerto Rico experiment (Pennell and LeMone, 1974) for the mixed layer over a tropical ocean. A three-dimensional model by Sommeria (1976 and 1978) has shown good agreement with the observed data. In this chapter, a similar one-dimensional model is presented which may be used for similar experiments for the monsoon region.
Basic equations
Atmospheric turbulence is assumed to be statistically homogeneous. The mean values of the dependent variables, namely, the components of the wind vector, potential temperature and the pressure gradient are assumed to be independent of horizontal space coordinates. This implies that the horizontal variation of the mean flow is assumed to be small compared with its vertical variation.
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- Monsoon Dynamics , pp. 615 - 626Publisher: Cambridge University PressPrint publication year: 1981