Model evaluation of the atmospheric boundary layer and mixed-layer evolution |
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| Authors: | Maria Tombrou Aggeliki Dandou Costas Helmis Evaggelos Akylas George Angelopoulos Helena Flocas Vasiliki Assimakopoulos Nikolaos Soulakellis |
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| Institution: | (1) Lab. of Meterology, Department of Applied Physics, National and Kapodistrian University of Athens, Build. Phys. V., University Campus, 157 84 Athens, Greece;(2) Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Lofos Koufou, Penteli, 152 36 Athens, Greece;(3) Department of Geography, University of the Aegean, 811 00 Mytilene, Greece |
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| Abstract: | 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 confined
internal boundary layer is formed. For the urban scheme, the incorporation of both anthropogenic and storage heat release
provides promising results for urban applications. |
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| Keywords: | Atmospheric boundary layer Eddy viscosity Entrainment layer Mixing height MM5 model Sea breeze |
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