RH and UHI
Relative Humidity 7.76g 14.8g 27.69g
Urban Heat Islands Effects first discovered in 19 th Century (why??) First detailed by Chandler in 1965
Mainly night time effect City is on average 3-4 oC higher Generally temperatures grow towards the inner city Varies over different land uses –Parks etc –Density of buildings
Purple = Richmond Park
Changes in UHI Less Pronounced (less pollution, clean air act 1956, catalytic converters in cars, electric trams, less coal used in homes) Building materials (higher albedos) City planning (density of buildings) Less heavy polluting industry CITY SIZE
Effects of UHI Vegetation – flowering?? Heating and cooling systems More time outside?? – pavement café’s
UHI – Los Angeles 1930 – area covered with orchards, ave summer temp 97 oF 1990’s av summer temp 105 oF