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Numerical Simulation of Boundary Layer Variables Using ē–ε Closure Scheme

N. RamanathanCentre for Atmospheric Sciences, Indian Institute of Technology, New Delhi, India

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K. SrinivasanCentre for Atmospheric Sciences, Indian Institute of Technology, New Delhi, India

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B. V. SeshasayeeCentre for Atmospheric Sciences, Indian Institute of Technology, New Delhi, India

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Abstract

In this study, a one-and-a-half-order ē–ε closure scheme is used to study the planetary boundary layer development over a full diurnal cycle using Wangara 33d-day observations as initial conditions. The simulated results are compared with a first-order closure model and higher-order closure model results. A scheme of this kind has the advantage of taking into account the history of turbulence state in terms of a prognostic equation for turbulence kinetic energy and provides a better basis for the representation of clouds. The results of the model simulations compare favorably with other investigators’ results.

Abstract

In this study, a one-and-a-half-order ē–ε closure scheme is used to study the planetary boundary layer development over a full diurnal cycle using Wangara 33d-day observations as initial conditions. The simulated results are compared with a first-order closure model and higher-order closure model results. A scheme of this kind has the advantage of taking into account the history of turbulence state in terms of a prognostic equation for turbulence kinetic energy and provides a better basis for the representation of clouds. The results of the model simulations compare favorably with other investigators’ results.

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