AS.270.103 Lecture Notes - Lecture 25: Urban Heat Island, Evapotranspiration, Latent Heat
23 Jan 2017
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Document Summary
Urban areas have hotter temperatures than the surrounding area. Urban landscape is very heterogeneous take this into account when determining the temperature. Ground heat flux is the transport of heat into the ground. Sensible heat flux is the movement of warm air up (transports heat) Latent heat flux is the removal of heat when water transforms from one state to another (i. e. evaporation) Surface material (i. e. concrete or asphalt) absorbs and stores a lot more heat than pasture for example. I. e. if buildings did not exist, a lot of the solar radiation might be reflected, but instead are absorbed (surfaces are dark) Trapping effect with buildings they trap outgoing thermal radiation which reemit from all directions (multiple surfaces can absorb reflected sunlight) Pollution plumes absorb and reemit thermal radiation. Few trees, so evapotranspiration is low and sensible heat flux is high/latent heat flux is. Industrial materials tend to absorb and retain heat low.
