Abstract
Abstract A laser radar (lidar) operating at the ruby line 0.6943 μm has been observing horizontal profiles of particulate concentration in the air some 30 m above the surface within the city of London over a period of one year. Anomalous features in these profiles are interpreted as natural thermal plumes carrying particles upwards from surfaces such as paved roadways, paved parking lots, treed parks, residential construction sites, open ploughed fields, and the river. Insolation of the ground is required for their formation, and neutral thermal stability aloft favours their incidence.
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