Sea-breeze scaling from numerical model simulations,part II: Interaction between the sea breeze and slope flows |
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Authors: | Aurore Porson Douw G Steyn Guy Schayes |
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Institution: | 1.Institut d’Astronomie et de Géophysique Georges Lema?tre,Université Catholique de Louvain,Brussels,Belgium;2.Department of Earth and Ocean Sciences,University of British Columbia,Vancouver,Canada |
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Abstract: | Numerical model simulations of sea-breeze circulations in the presence of idealized topography are subjected to dimensional
analysis in order to capture the dynamics of the sea-breeze circulation combined with an upslope-flow circulation. A secondary
objective is to reconcile previous results based on observations. The analysis is based on a scaling analysis of sea-breeze
speed, depth and volume flux. This study is motivated by the fact that the literature of sea breezes interacting with upslope
flows is generally qualitative. Results show clear scaling regimes and strong interaction between the two thermally driven
circulations. We distinguish three regimes, depending on slope length, slope angle, stability and surface heat flux. The first
and third regimes obey the scaling laws of pure sea-breeze scaling. The second regime shows a significant decrease in the
scaled volume flux relative to pure sea-breeze scaling. Dynamical relations in the second regime show a strong influence on
the circulation of upslope stable air advection. |
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Keywords: | Numerical model Scaling analysis Sea breeze Slope flow Stability Surface heat flux |
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