Improvement of Vertical Diffusion Analytic Schemes Under Stable Atmospheric Conditions |
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| Authors: | Amela Jeri?evi? ?eljko Ve?enaj |
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| Institution: | (1) MHSC Meteorological Service, Zagreb, Croatia;(2) AMGI Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb, Croatia |
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| Abstract: | Based on gradient transport theory or K-theory, turbulent transport in the atmosphere has long been parameterized using the
eddy diffusivity. Due to its simplicity, this approach has often been applied in many numerical models but rarely tested with
observations. Here, the widely used O’Brien cubic polynomial approach has been validated together with an exponential approach
against eddy diffusivity profiles determined from measurements and from large-eddy simulation data in stable conditions. Verification
is completed by analyzing the variability effects on pollutant concentrations of two different vertical diffusion (K(z)) schemes incorporated in an atmospheric chemical model. It is shown that the analytical, exponential solution agrees better
with observations than the O’Brien profile and should be used henceforth in practical applications. |
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| Keywords: | Air quality models K-theory Linear exponential approach O’ Brien profile |
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