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首页> 外文期刊>Building and Environment >Preliminary study on the temperature relationship at remotely-sensed tree canopy and below-canopy air and ground surface
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Preliminary study on the temperature relationship at remotely-sensed tree canopy and below-canopy air and ground surface

机译：远程感测树冠和下坡空气和地面温度关系的初步研究

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Thermal infrared remote sensing is a popular tool to measure the impacts of land cover on land surface temperature (LST) in cities. Tree-covered areas usually exhibit a lower LST than other urban surfaces such as concrete, suggesting that urban trees can improve human thermal comfort. However, the remotely-sensed LST of trees is only representative of their canopy temperature. The linkage between the LST of trees and the belowcanopy thermal conditions has not been investigated scientifically. This study aimed to measure the differences and determine the correlations between tree canopy temperature (Tc), below-canopy ground surface temperature (Ts) and below-canopy air temperature (Ta) from 42 trees of 16 species in a golf course in Hong Kong. Under the meteorological conditions of the study period (air temperature: similar to 26 degrees C; mean radiant temperature: -30 degrees C), t-tests showed that mean +/- SD Tc (24.1 +/- 2.9 degrees C) did not significantly differ from Ts (24.5 +/- 1.8 degrees C, p = 0.158), but it was significantly lower than Ta (25.4 +/- 2.3 degrees C, p 0.001). Tc was highly and significantly correlated with Ts (r = 0.81, p 0.001) and Ta (r = 0.92, p 0.001). Further analyses showed that the differences between Tc and Ts (Delta Tcs) and between Tc and Ta (Delta Tca) were significantly dependent on background air temperature (Delta Tcs only), relative humidity, mean radiant temperature and incoming shortwave radiation. This study serves as a preliminary investigation on an important knowledge gap in urban climate research. The findings are particularly relevant to researchers who use remotely-sensed LST data to study human thermal comfort.
机译：热红外遥感是一种流行的工具，可以测量陆地覆盖在城市的陆地温度（LST）的影响。树木覆盖的地区通常表现出比其他城市表面更低的LST，如混凝土，这表明城市树木可以改善人类的热舒适度。然而，偏心感测的树木的LST仅代表他们的树冠温度。树木的LST与低于癌症热情之间的联系尚未科学地研究过。本研究旨在衡量差异，并确定树冠冠层温度（Tc），下层地面温度（TS）和冠层低尔夫球场的42棵树4种树上的相关性的相关性。在研究期的气象条件下（空气温度：与26摄氏度类似;平均辐射温度：-30℃），T检验显示，平均值+/-SD TC（24.1 +/- 2.9℃）没有与TS（24.5 +/- 1.8℃，P = 0.158）显着不同，但它显着低于Ta（25.4 +/- 2.3℃，P <0.001）。 TC与Ts（r = 0.81，p <0.001）和Ta（r = 0.92，p <0.001）高度相关。进一步的分析表明，TC和TS（DELTA TCS）和TC和TA（DELTA TCA）之间的差异显着取决于背景空气温度（仅限DELTA TCS），相对湿度，平均辐射温度和传入的短波辐射。本研究旨在作为城市气候研究中重要知识差距的初步调查。该研究结果与使用远程感测的LST数据的研究人员来研究人类热舒适度。

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