ABSTRACT Urban greenery provide a variety of goods and services to city dwellers. A core one is amelioration of the urban heat island effect. However, the many estimates from temperate regions cannot be extrapolated to the tropics, where more empirical studies are required to guide urban planning and optimization of green infrastructure design and distribution. This study reports on the temperature differentials in fortnightly readings, in winter and summer, between 12 urban green spaces and the surrounding built-up urban matrix at increasing distances from each green space. Additionally, the value of energy costs saved for air conditioning by urban greenery was calculated. The mean difference in temperature between green spaces and neighbouring built-up areas was 3.6°C, and in summer ranged from 0.9°C to 6.1°C and in winter 0.9°C to 5.7°C. The cooling effects extended up to 1.7 km beyond the centre of green spaces. The magnitude of cooling increased slightly with increasing green space size. These cooling effects translated into a cost on energy saving of approximately US$532/household/yr. Given the weak economy and incomes in Zimbabwe, this saving is considerable and can contribute to the multiple motivations for more green spaces in the city.

中文翻译：

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津巴布韦布拉瓦约城市绿地空气温度改善的程度、范围和价值

摘要 城市绿化为城市居民提供各种商品和服务。一个核心是改善城市热岛效应。然而，温带地区的许多估计不能外推到热带地区，需要更多的实证研究来指导城市规划和绿色基础设施设计和分布的优化。本研究报告了冬季和夏季每两周一次的温度差异，其中 12 个城市绿地与周围建成的城市矩阵之间距离每个绿地越来越远。此外，还计算了城市绿化为空调节省的能源成本的价值。绿地与邻近建成区的平均温差为 3.6°C，夏季为 0.9°C 至 6.1°C，冬季为 0.9°C 至 5.7°C。冷却效果延伸至绿地中心以外 1.7 公里。随着绿地面积的增加，降温幅度略有增加。这些冷却效果转化为大约 532 美元/家庭/年的节能成本。鉴于津巴布韦的经济和收入疲软，这种节省是相当可观的，并且可以促进城市中更多绿色空间的多种动机。