@article{0037e600a3c442f598f8831ea923db41,
title = "Do urban tree hydraulics limit their transpirational cooling? A comparison between temperate and hot arid climates",
abstract = "Evaporative cooling due to transpiration of urban trees in two contrasting climates is the subject of this study. Transpiration was studied experimentally on local tree species at {\textquoteleft}tree lab{\textquoteright} sites in Munich, Germany (temperate climate) and in Beer Sheva, Israel (hot arid climate), within various settings (park, street, square) with natural and sealed surface conditions. The comparison was based on linear relationship of midday canopy resistance to atmospheric vapor pressure deficit (VPD), where the slope is proportional to tree hydraulic conductance and midday stem water potential. Sap flux densities in all trees were similar but crown projected area (CPA) was larger in Beer Sheva, resulting in higher hydraulic resistance that limits transpirational cooling (regression slopes of 0.25–0.44 in Beer Sheva vs. 0.10–0.18 in Munich). The contribution of the transpirational cooling, studied as the proportion of latent heat to total available energy was about 40% less significant at noon hours in summer in Beer Sheva than in Munich. Results suggested that shading should be the main consideration in planting local trees in hot dry climates. The linear relationship of midday canopy resistance to VPD is proposed as an operative tool for comparing evaporative cooling between local trees in different climatic regions.",
keywords = "Canopy resistance, Sap flow, Transpirational cooling, Urban energy budget, Urban trees",
author = "Limor Shashua-Bar and Rahman, {Mohammad A.} and Astrid Moser-Reischl and Aviva Peeters and Eleonora Franceschi and Hans Pretzsch and Thomas R{\"o}tzer and Stephan Pauleit and Gidon Winters and Elli Groner and Shabtai Cohen",
note = "Funding Information: The authors wish to thank the German Research Foundation - DFG as part of the Middle East Collaboration Program for funding the project [PA 2626/3-1 and PR 292/21-1]. In addition, the authors wish to thank Wolfgang Motzafi-Haller and the Shamoon College of Engineering (SCE) for their support in establishing and running the tree lab in Beer Sheva as well as the Stadtwerke M{\"u}nchen, the Academy of Fine Arts in Munich, and the Immobilien Freistaat Bayern for the permission to set up tree labs on their properties in Munich. We thank the Israel Ministry of Science and Technology for their support to EG and GW. We would also like to thank the responsible municipalities in Munich, and Beer Sheva for allowing us to carry out measurements in these cities. Funding Information: The authors wish to thank the German Research Foundation - DFG as part of the Middle East Collaboration Program for funding the project [ PA 2626/3-1 and PR 292/21-1 ]. In addition, the authors wish to thank Wolfgang Motzafi-Haller and the Shamoon College of Engineering (SCE) for their support in establishing and running the tree lab in Beer Sheva as well as the Stadtwerke M{\"u}nchen, the Academy of Fine Arts in Munich, and the Immobilien Freistaat Bayern for the permission to set up tree labs on their properties in Munich. We thank the Israel Ministry of Science and Technology for their support to EG and GW. We would also like to thank the responsible municipalities in Munich, and Beer Sheva for allowing us to carry out measurements in these cities. Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",
year = "2023",
month = may,
day = "1",
doi = "10.1016/j.uclim.2023.101554",
language = "English",
volume = "49",
journal = "Urban Climate",
issn = "2212-0955",
publisher = "Elsevier BV",
}
