Investigation of cold-air drainage events during the night over undulating terrain
DOI:
https://doi.org/10.5902/2179460X77188Keywords:
Cold-air flow, Surface slope, Stable conditionsAbstract
The aim of the work is to investigate the possibility of cold air drainage flows over gently undulating terrain with a grassland cover. Such type of landscape is found in southern Brazil, Uruguay, and Argentina. Drainage flows have been reported in previous studies and seem to happen over a wide range of scales of topographic features. Under stable atmospheric conditions, thin-cold air layers may form and accumulate over the surface. If the surface is sloped, the weight can exceed the local vertical pressure gradient causing the cold air to acquire a negative buoyancy and flow down the slope. Such flows make the cold air to accumulate at the lower parts of the terrain. In the work, we analyze temperature, wind, and longwave radiation data collected at a micrometeorological. During several occasions is observed that the flow near the surface, at levels below 4 m, follows the direction of the slope, while the flow above follows different directions. Such events have wind speeds less than 1 ms-1 and happens when the flow at the top of the tower (30 m) is less than 4 ms-1.
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