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Effect of different land cover/use types on canopy layer air temperature in an urban area with a dry climate

机译：气候干燥城市地区不同土地利用/用途类型对冠层空气温度的影响

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Knowledge of the influence of land cover on air temperature in arid cities is scarce, yet essential for urban planners to select landscape design and management strategies which can improve livability and provide efficient landscape irrigation. The objectives of this study were to consider the effects of urban land use on air temperature changes in an arid city based on data collected in Isfahan, Iran at a local scale. This study reports a statistical analysis of temperature variation with respect to land use throughout the day and night. It is also the first study to report the effects of land cover on the time that daily minimum and maximum temperature occurs. The land use characteristics considered included green space, streets, buildings, population density and bare land. Air temperature was measured for 42-months at the canopy level of five intra urban sites and one reference site in a lightly developed suburban location. The temperature of all intra-urban sites was higher than the suburban reference site for a majority of observations during daytime throughout the year. The effect of land use on air temperature overnight was greater than daytime. The highest temperature difference occurred overnight in summer, with differences up to 12 degrees C when comparing an irrigated, vegetated site and the suburban site on an hourly basis. On average, the daily maximum temperature in urban areas occurred sooner than in the suburb in all seasons. The highest mean time difference was 78 min between the commercial residential and suburban stations in summer. (C) 2017 Elsevier Ltd. All rights reserved.
机译：缺乏关于干旱地区城市土地覆盖对气温的影响的知识，但对于城市规划人员选择能够改善宜居性并提供有效景观灌溉的景观设计和管理策略至关重要。这项研究的目的是根据伊朗伊斯法罕在地方范围内收集的数据，考虑干旱地区城市土地利用对气温变化的影响。这项研究报告了白天和黑夜温度变化与土地利用相关的统计分析。这也是第一个报告土地覆盖对每日最低和最高温度发生时间的影响的研究。考虑的土地利用特征包括绿地，街道，建筑物，人口密度和裸地。在一个轻度发达的郊区，对五个市区内站点和一个参考站点的冠层水平进行了42个月的气温测量。在全年的白天中，大部分观测结果表明，所有城市内部站点的温度都高于郊区参考站点。一夜之间土地使用对气温的影响大于白天。最高的温差发生在夏季的一夜之间，每小时比较一次灌溉，植被和郊区的温度差高达12摄氏度。平均而言，在所有季节中，城市地区的每日最高气温出现的时间均高于郊区。夏季，商业住宅和郊区车站之间的平均时差最高，为78分钟。 （C）2017 Elsevier Ltd.保留所有权利。

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