中国 70 个城市的城市树木在炎热夏季提高了降温效率

IF 6.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Limei Yang, Jun Ge, Yipeng Cao, Yu Liu, Xing Luo, Shiyao Wang, Weidong Guo
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引用次数: 0

摘要

提高城市树木覆盖率(TCP)被广泛认为是缓解城市热岛效应的有效方法。根据城市树木对环境温度上升的生理反应,城市树木的降温效率在高温天既可以提高,也可以降低。然而,对于中国城市而言,城市树木的降温效率对城市气温上升的反应还没有得到很好的量化。在本研究中,我们基于卫星观测数据,对中国 70 个经济发达城市 2003-19 年间 17 个夏季(6 月、7 月和 8 月)正午时分[∼1330 LT(当地时间),LT=UTC+8]的城市树木降温效率对城市气温上升的响应进行了量化。结果表明,随着气温的升高,城市树木的降温效率更高,这表明在较热的天气里,城市树木能提供额外的降温效益。在所选城市中,气温每升高 1°C,城市树木的降温效率增强值从 0.002 到 0.055°C %-1 不等,低总温差水平城市的数值更大。这种反应还受背景温度和降水量的影响,因为在相同的 TCP 水平下,温度较高和降水量较多的城市的额外降温效益往往更大。城市树木的降温效率对城市气温升高的正向响应主要是由于城市树木在较热的天气里有较强的蒸腾作用。这些结果对于通过利用城市树木缓解城市热风险具有重要意义,特别是考虑到在全球变暖的情况下,城市极端高温天越来越频繁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced Cooling Efficiency of Urban Trees on Hotter Summer Days in 70 Cities of China

Increasing the urban tree cover percentage (TCP) is widely recognized as an efficient way to mitigate the urban heat island effect. The cooling efficiency of urban trees can be either enhanced or attenuated on hotter days, depending on the physiological response of urban trees to rising ambient temperature. However, the response of urban trees’ cooling efficiency to rising urban temperature remains poorly quantified for China’s cities. In this study, we quantify the response of urban trees’ cooling efficiency to rising urban temperature at noontime [∼1330 LT (local time), LT=UTC+8] in 17 summers (June, July, and August) from 2003–19 in 70 economically developed cities of China based on satellite observations. The results show that urban trees have stronger cooling efficiency with increasing temperature, suggesting additional cooling benefits provided by urban trees on hotter days. The enhanced cooling efficiency values of urban trees range from 0.002 to 0.055°C %−1 per 1°C increase in temperature across the selected cities, with larger values for the low-TCP-level cities. The response is also regulated by background temperature and precipitation, as the additional cooling benefit tends to be larger in warmer and wetter cities at the same TCP level. The positive response of urban trees’ cooling efficiency to rising urban temperature is explained mainly by the stronger evapotranspiration of urban trees on hotter days. These results have important implications for alleviating urban heat risk by utilizing urban trees, particularly considering that extreme hot days are becoming more frequent in cities under global warming.

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来源期刊
Advances in Atmospheric Sciences
Advances in Atmospheric Sciences 地学-气象与大气科学
CiteScore
9.30
自引率
5.20%
发文量
154
审稿时长
6 months
期刊介绍: Advances in Atmospheric Sciences, launched in 1984, aims to rapidly publish original scientific papers on the dynamics, physics and chemistry of the atmosphere and ocean. It covers the latest achievements and developments in the atmospheric sciences, including marine meteorology and meteorology-associated geophysics, as well as the theoretical and practical aspects of these disciplines. Papers on weather systems, numerical weather prediction, climate dynamics and variability, satellite meteorology, remote sensing, air chemistry and the boundary layer, clouds and weather modification, can be found in the journal. Papers describing the application of new mathematics or new instruments are also collected here.
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