Original paper

Effects of different vegetation on temperature in an urban building environment. Micro-scale numerical experiments

Gross, Günter

Meteorologische Zeitschrift Vol. 21 No. 4 (2012), p. 399 - 412

published: Aug 1, 2012

DOI: 10.1127/0941-2948/2012/0363

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ArtNo. ESP025012104007, Price: 29.00 €

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A three-dimensional micro-scale model is used to study the effects of various greenery on temperature in a built-up environment. Green design elements like roofs and facades, lawns in courtyards and single trees are studied individually as well as in various combinations. Measures for comparison are temperatures at 2 m height and mean temperatures for the urban atmosphere up to the building height. Different types of greenery can reduce local temperatures up to 15 K during specific daytime hours. However, this extraordinary effect is restricted to a short time and especially to the direct surroundings, while an impact over larger distances is small. Roof and facade greenery have hardly any influence on temperature at the 2 m level but reduce daytime heating of the urban atmosphere to a minor degree, while the relevance of trees is more or less limited to the shadow effect. A significant decrease in urban temperatures can be achieved only with a large number of very different individual green elements. The largest effect on the urban atmosphere was simulated for a change in albedo resulting in a temperature decrease of some degrees around noon.