Investigating the impact of evapotranspiration from urban green space vertical structures on microclimate through energy and water vapor transfer dynamics

IF 6.9 2区工程技术 Q1 ENVIRONMENTAL SCIENCES

Urban Climate Pub Date : 2025-08-01 DOI:10.1016/j.uclim.2025.102539

Qi Li , Qiong Li , Haotian Wu , Sisi Chen , Yasuyuki Ishida , Akashi Mochida , Zhixin Liu

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引用次数: 0

Abstract

The vertical structure of urban green spaces (UGSs) affects evapotranspiration (ET), influencing the microclimate regulation effect. This study focuses on analyzing the impact of the vertical structure of a small UGS on microclimate through energy and water vapor transfer dynamics. We developed a UGS microclimate model based on the three-layer ET model and validated it using observational data. The results demonstrated strong consistency between the model estimates and observed data, with RMSEs of air temperature (T_a1.5), specific humidity (q_a1.5), and relative humidity (RH_1.5) of 0.6 °C, 0.4 g·kg⁻¹ and 2.1 %, respectively. ET from the shrub crown and soil surface played critical roles in regulating the microclimate of UGS. During hot periods, ET from the shrub crown contributed over 50 % of the total ET cooling effect in the UGS, primarily due to the significant turbulent exchange of energy and water vapor flux from the shrub crown to human height. Therefore, ground conditions beneath the tree crown should not be neglected when designing vegetation configurations in UGSs.

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通过能量和水汽传递动力学研究城市绿地垂直结构蒸散发对小气候的影响

城市绿地的垂直结构影响着蒸散发，影响着城市绿地的小气候调节效果。本研究主要通过能量和水汽传输动力学分析小型地下震源垂直结构对小气候的影响。基于三层ET模式建立了UGS小气候模式，并利用观测资料进行了验证。结果表明，模型估算值与观测数据具有较强的一致性，气温（Ta1.5）、比湿度（qa1.5）和相对湿度（RH1.5）的均方根误差分别为0.6°C、0.4 g·kg - 1和2.1%。灌木冠层和土壤表面的ET在调节UGS小气候中起关键作用。在炎热季节，灌木树冠的ET对UGS总ET冷却效应的贡献超过50%，这主要是由于灌木树冠与人类高度之间的能量和水汽通量的湍流交换。因此，在设计ugs植被配置时，不能忽视树冠下的地面条件。

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来源期刊

Urban Climate Social Sciences-Urban Studies

CiteScore

9.70

自引率

9.40%

发文量

286

期刊介绍： Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]