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•The idea that photosynthesis‐weighted tree canopy leaf temperature (Tcanδ) can be resolved through analysis of oxygen isotope composition in tree wood cellulose (δ18Owc) has led to the observation of boreal‐to‐subtropical convergence of Tcanδ to c. 20°C.
•To further assess the validity of the large‐scale convergence of Tcanδ, we used the isotope approach to perform calculation of Tcanδ for independent...
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