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Analysis of nocturnal air temperature in districts using mobile measurements and a cooling indicator

机译：使用移动测量和冷却指示器分析区域的夜间气温

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摘要

The urban heat island phenomenon is generally defined as an air temperature difference between a city center and the non-urbanized rural areas nearby. However, this description does not encompass the intra-urban temperature differences that exist between neighborhoods in a city. This study investigates the air temperature dynamics of neighborhoods for meteorological conditions that lead to important urban heat island amplitude. Local climate zones (LCZs) have been determined in Nancy, France, and mobile screen-height air temperature measurements are performed using an instrumented vehicle. Initially, hourly measurements are performed within four different LCZs. These results show that air temperature within LCZ demonstrates a nocturnal cooling in two phases, i.e., a first phase between 1 to 3 h before sunset and 3 to 5 h after sunset, and a second phase from 3 to 5 h after sunset to sunrise. During phase 1, neighborhoods exhibit different cooling rate values and air temperature gaps develop between districts, while during phase 2, cooling rates tend to be analogous. Then, a larger meteorological data set is used to investigate these two phases for a selection of 13 LCZs. Normalized cooling rates are calculated between daytime measures and nighttime measures in order to quantify the air temperature dynamics of the studied areas during phase 1. Considering this indicator, three groups are emerging:
机译：城市热岛现象通常定义为市中心与附近未城镇化的农村地区之间的空气温差。但是，此描述不包含城市中各社区之间存在的城市内部温度差异。这项研究调查了导致重要城市热岛振幅的气象条件下邻里的气温动态。在法国的南锡，已经确定了当地的气候区（LCZ），并且使用仪表车进行了移动屏幕高度空气温度的测量。最初，每小时的测量在四个不同的LCZ中执行。这些结果表明，LCZ内的空气温度表现出两个阶段的夜间冷却，即，第一阶段介于日落前1至3小时之间以及日落之后3至5小时之间，第二阶段是从日落至日出后3至5小时之间。在第1阶段，邻居显示不同的冷却速率值，并且各区域之间会出现空气温度差距，而在第2阶段，冷却速率趋于相似。然后，使用较大的气象数据集来调查这两个阶段，以选择13个LCZ。为了在阶段1期间量化研究区域的空气温度动态，计算了白天和夜晚之间的标准化降温率。考虑到该指标，出现了三类：

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  • 来源
    《Theoretical and applied climatology》 |2017年第2期|365-376|共12页
  • 作者

    Leconte Francois; Bouyer Julien; Claverie Remy; Petrissans Mathieu;

  • 作者单位

    ADEME, 20 Ave Gresille,BP 90406, F-49004 Angers 01, France|CEREMA Direct Terr Est, 71 Rue Grande Haie, F-54510 Tomblaine, France|LERMAB, Blvd Aiguillettes,BP 70239, F-54506 Vandoeuvre Les Nancy, France;

    CEREMA Direct Terr Est, 71 Rue Grande Haie, F-54510 Tomblaine, France;

    CEREMA Direct Terr Est, 71 Rue Grande Haie, F-54510 Tomblaine, France;

    LERMAB, Blvd Aiguillettes,BP 70239, F-54506 Vandoeuvre Les Nancy, France;

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