Do urban tree hydraulics limit their transpirational cooling? A comparison between temperate and hot arid climates

Shashua‐Bar, Limor; Rahman, Mohammad A.; Moser-Reischl, Astrid; Peeters, Aviva; Franceschi, Eleonora; Pretzsch, Hans; Rötzer, Thomas; Pauleit, Stephan; Winters, Gidon; Groner, Elli; Cohen, Shabtai

doi:10.1016/j.uclim.2023.101554

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…Current research is mainly focused on tropical, arid, and temperate regions and their native tree species. Little is known in humid and hot climates [13,34].…”

Section: Shade Creation and Radiation Modificationmentioning

confidence: 99%

“…Radiation attenuation and transpiration are important tree factors for the balance of surface energy and the water vapor cycle of the hydrosphere-atmospherebiosphere [12]. Through canopy shading and transpiration [13], trees can adjust the outdoor radiant heat, affect the heat and moisture balance of the surrounding environment [14], and change the outdoor microclimate and urban environment. Trees can also reduce wind speed, enhance airflow turbulence [15], change outdoor wind flow characteristics, reduce convective heat and mass transfer coefficients [16], and further affect the heat and moisture balance between trees and the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

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Heat Mitigation Benefits of Urban Trees: A Review of Mechanisms, Modeling, Validation and Simulation

Zheng,

He,

Guldmann

et al. 2023

Forests

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Modeling, validating, and simulating are three essential parts in investigating the heat mitigation benefits of urban trees (BUT). Therefore, 81 relevant studies from the last ten years are reviewed, analyzed, and summarized in this study. Three main ways for urban trees to adjust the environment are summarized, including shade creation and radiation modification, cooling effects of transpiration, and airflow blocking and modification effects. Research works are analyzed with regard to four categories: (1) heat and moisture exchange mechanisms and their mathematical modeling; (2) verification of modeling predictions based on measurements; (3) thermal performance simulation and prediction; and (4) environmental assessment and human thermal comfort analyses. Future research opportunities are discussed: (1) conduct real-time and in-depth measurements to analyze the mechanisms of heat and moisture transfer of trees in different areas; (2) develop tree radiation attenuation, airflow resistance, and transpiration models to accurately describe heat and moisture transfer processes in the urban environment; and (3) establish a three-dimensional numerical simulation method that can accurately simulate the urban thermal environment with trees. This review provides researchers with an overview and potential research opportunities on the thermal effects of urban trees.

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“…Current research is mainly focused on tropical, arid, and temperate regions and their native tree species. Little is known in humid and hot climates [13,34].…”

Section: Shade Creation and Radiation Modificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat Mitigation Benefits of Urban Trees: A Review of Mechanisms, Modeling, Validation and Simulation

Zheng,

He,

Guldmann

et al. 2023

Forests

View full text Add to dashboard Cite

show abstract

“…Previous studies have proven that urban vegetation can strengthen interception and evapotranspiration, and thus, the latent heat (LE) will increase and the sensible heat (H) will decrease, finally reducing the heat island effect [9,10]. Shashua-Bar et al [11] discussed the tree transpiration cooling effect in arid and temperate climates by continuously measuring tree sap flux density and soil water content, and found that latent heat dissipation is 40% less in hot arid climates than in temperate climates.…”

Section: Introductionmentioning

confidence: 99%

Integrated Assessment of the Runoff and Heat Mitigation Effects of Vegetation in an Urban Residential Area

Wu,

Chang,

Kazama

et al. 2024

Sustainability

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Urban vegetation has an essential role in maintaining the hydrological and energy balance. These processes in urban areas have been long overlooked due to the fragmentation and uneven feature of land use and vegetation distribution. Recent advances in remote sensing and the ease of data acquisition have allowed a more precise mapping of vegetation and land cover, making it possible to simulate the above processes at micro scales. This research selects a small typical residential catchment in Japan as the study area and the purpose of this research is to investigate the impact of urban vegetation on mitigating urban runoff and the heat island effect. The remote-sensed Normalized Difference Vegetation Index (NDVI) data were used to represent vegetation spatial distribution and seasonal variation. A single layer canopy model and the Storm Water Management Model were coupled to simulate interception, evapotranspiration, and runoff generation processes. The effects of vegetation amount and landscape patterns on the above processes were also considered. The results showed that the coupled model had a satisfactory performance in the modeling of these processes. When the vegetation amount was set to 1.4 times its original value, the summer total runoff had a 10.7% reduction and the average surface temperature had a 2.5 °C reduction. While the vegetation amount was 0.8 times its original value, the total runoff increased by 6%, and the average surface temperature in summer increased by 1.5 °C. The combination of green roof and dense street trees showed the best mitigation performance among the different landscape patterns. The results of this study could be used as a reference for future green infrastructure development in areas with similar climate and vegetation characteristics.

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Impact of a water restriction on the summer climatic benefits of trees inside an outdoor street canyon scale model

Thierry,

Herpin,

Levi

et al. 2024

Building and Environment

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Do urban tree hydraulics limit their transpirational cooling? A comparison between temperate and hot arid climates

Cited by 7 publications

References 38 publications

Heat Mitigation Benefits of Urban Trees: A Review of Mechanisms, Modeling, Validation and Simulation

Heat Mitigation Benefits of Urban Trees: A Review of Mechanisms, Modeling, Validation and Simulation

Integrated Assessment of the Runoff and Heat Mitigation Effects of Vegetation in an Urban Residential Area

Impact of a water restriction on the summer climatic benefits of trees inside an outdoor street canyon scale model

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