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Trends of urban surface temperature and heat island characteristics in the Mediterranean

机译：地中海城市地表温度和热岛特征趋势

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摘要

Urban air temperature studies usually focus on the urban canopy heat island phenomenon, whereby the city center experiences higher near surface air temperatures compared to its surrounding non-urban areas. The Land Surface Temperature (LST) is used instead of urban air temperature to identify the Surface Urban Heat Island (SUHI). In this study, the nighttime LST and SUHI characteristics and trends in the seventeen largest Mediterranean cities were investigated, by analyzing satellite observations for the period 2001-2012. SUHI averages and trends were based on an innovative approach of comparing urban pixels to randomly selected non-urban pixels, which carries the potential to better standardize satellite-derived SUHI estimations. A positive trend for both LST and SUHI for the majority of the examined cities was documented. Furthermore, a 0.1 A degrees C decade(-1) increase in urban LST corresponded to an increase in SUHI by about 0.04 A degrees C decade(-1). A longitudinal differentiation was found in the urban LST trends, with higher positive values appearing in the eastern Mediterranean. Examination of urban infrastructure and development factors during the same period revealed correlations with SUHI trends, which can be used to explain differences among cities. However, the majority of the cities examined show considerably increased trends in terms of the enhancement of SUHI. These findings are considered important so as to promote sustainable urbanization, as well as to support the development of heat island adaptation and mitigation plans in the Mediterranean.
机译：城市空气温度研究通常着眼于城市冠层热岛现象，与城市周围的非城市地区相比，城市中心的近地面空气温度更高。土地表面温度（LST）代替了城市空气温度来识别城市表面热岛（SUHI）。在这项研究中，通过分析2001-2012年期间的卫星观测资料，调查了地中海17个最大城市的夜间LST和SUHI特征及趋势。 SUHI的平均值和趋势基于将城市像素与随机选择的非城市像素进行比较的创新方法，这具有更好地标准化源自卫星的SUHI估计的潜力。大部分受调查城市的LST和SUHI都呈上升趋势。此外，城市LST升高0.1 A摄氏度十进制（-1）对应于SUHI增加约0.04 A摄氏度十进制（-1）。在城市LST趋势中发现了纵向差异，在地中海东部出现了较高的正值。同期对城市基础设施和发展因素的调查显示出与SUHI趋势的相关性，可以用来解释城市之间的差异。但是，大多数受调查城市显示出SUHI增强的趋势大大增加。这些发现被认为是重要的，以促进可持续的城市化，并支持地中海热岛适应和减缓计划的发展。

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  • 来源
    《Theoretical and applied climatology》 |2017年第4期|807-816|共10页
  • 作者

    Benas Nikolaos; Chrysoulakis Nektarios; Cartalis Constantinos;

  • 作者单位

    Inst Appl & Computat Math, Fdn Res & Technol Hellas FORTH, N Plastira 100, Iraklion 70013, Greece;

    Inst Appl & Computat Math, Fdn Res & Technol Hellas FORTH, N Plastira 100, Iraklion 70013, Greece;

    Univ Athens, Dept Environm Phys, Build PHYS 5, Athens 15784, Greece;

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