Model evaluation of the atmospheric boundary layer and mixed-layer evolution
| Autor: | Evaggelos Akylas, Costas G. Helmis, Nikolaos Soulakellis, Vasiliki D. Assimakopoulos, A. Dandou, George Angelopoulos, Maria Tombrou, Helena A. Flocas |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Mixing height
Sea breeze Atmospheric Science Environmental Engineering Meteorology Mixed layer Planetary boundary layer Mesoscale meteorology Turbulence modeling MM5 model Atmospheric sciences Atmospheric boundary layer Eddy viscosity Convective Boundary Layer Boundary layer Atmospheric convection Entrainment layer MM5 Environmental science Engineering and Technology |
| Popis: | In the present study, an attempt is made to assess the atmospheric boundary-layer (ABL) depth over an urban area, as derived from different ABL schemes employed by the mesoscale model MM5. Furthermore, the relationship of the mixing height, as depicted by the measurements, to the calculated ABL depth or other features of the ABL structure, is also examined. In particular, the diurnal evolution of ABL depth is examined over the greater Athens area, employing four different ABL schemes plus a modified version, whereby urban features are considered. Measurements for two selected days, when convective conditions prevailed and a strong sea-breeze cell developed, were used for comparison. It was found that the calculated eddy viscosity profile seems to better indicate the mixing height in both cases, where either a deep convective boundary layer develops, or a more con- fined internal boundary layer is formed. For the urban scheme, the incorporation of both anthropogenic and storage heat release provides promising results for urban applications. |
| Databáze: | OpenAIRE |
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