We are experimenting with visualizations of the windspeed measured by our Doppler lidar over central London. The movie below shows data measured on 30th September 2011 when there was a strong Urban Heat Island. The movie shows how wind at various heights blows pollution around over the period from midnight to 6 am – 2 minutes in reality takes 1 second in the movie. Each red dot is a measurement “gate” where data was taken (30 metres separation), so you are seeing data from 90 m up to approximately 1.5 km. Longer streams show faster windspeeds at that height. There was a sharp peak in the windspeed at roughly 350 metres – a “nocturnal jet” – which forms with calm, cloudless conditions overnight: these are some of the first observations of such jets over London. We are really interested in looking at the relationship between jets and the Urban Heat Island.
Video: Courtesy of Dr. Adrian Haffegee – University of Reading, UK
Visualization of wind over central London as measured using Doppler lidar installed at Westminster City Council building on the Marylebone Road.
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