Aerial thermal scans over Perth – 16 years after this technology was used in the USA to measure urban heat island (UHI) effectsMay 9th, 2012 by Warwick Hughes
Chris Gilham has posted an item from the West Australian newspaper reporting the results of aerial thermal scans over Perth by a commercial firm Scantherma.
Of course this imagery can be used to prove the existence of the urban heat island (UHI) which magically never finds its way into IPCC temperature trends.
It is good to see this airborne technology used in Australia but airborne and satellite imagery has been detecting the UHI for decades. Here are several examples.
Summer land surface temperature of cities in the Northeast (USA) were an average of 7 °C to 9 °C (13°F to 16 °F) warmer than surrounding rural areas over a three year period, the new research shows.
Hong Kong study says – Air temperature typically reaches 37°C on the hottest summer days, cooling to 29°C in urban, and 24°C in rural areas at night.
Springtime land surface temperatures in eastern North American cities were on average 2.3°C (4.1°F) warmer than surrounding rural areas
also – Significant effects were seen up to 10 kilometers (6 miles) from city lines. In other words, the impact of urban climates on ecosystems extended out 2.4 times the size of a city itself.
A spot check of day temperatures around the Mall (Huntsville Alabama) shows that in the middle of the parking lot temperatures reach about 48.8 °C . However, a “tree island”, a small planter containing a couple of trees in the parking lot is only 31.6 °C. So, even a small area of tree coverage surrounded by a very hot parking lot reduced temperatures by a significant 17.2 °C !!
Canadian cities examples
Old site Wisconsin University
Old site of mine showing examples of satellite imagery
Atlanta (Hotlanta) and Florida satellite imagery showing Miami UHI