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ForestTemp - Sub-canopy microclimate temperatures of European forests

Stef Haesen 1 Jonas J. Lembrechts Pieter de Frenne 2 Jonathan Lenoir 3 Juha Aalto 4 Michael B. Ashcroft 5 Martin Kopecký 6, 7 Miska Luoto 4 Ilya Maclean 8 Ivan Nijs 9 Pekka Niittynen 4 Johan Hoogen Nicola Arriga 10 Josef Bruna Nina Buchmann 11 Marek Ciliak Alessio Collalti 12 Emiel de Lombaerde Patrice Descombes 13, 11 Mana Gharun 14 Ignacio Goded 15 Sanne Govaert 2 Caroline Greiser 16 Achim Grelle 17 Carsten Gruening 15 Lucia Hederová 6 Kristoffer Hylander 16 Jürgen Kreyling 18 Bart Kruijt 19 Martin Macek Frantisek Malis Matej Man Giovanni Manca Radim Matula 20 Camille Meeussen 2 Sonia Merinero 21 Stefano Minerbi 22 Leonardo Montagnani 23 Lena Muffler 18, 24 Romá Ogaya 25 Josep Peñuelas 25 Roman Plichta 26 Miguel Portillo-Estrada 9 Jonas Schmeddes 18 Ankit Shekhar Fabien Spicher 3 Mariana Ujházyová 27 Pieter Vangansbeke 2 Robert Weigel 24 Jan Wild 6 Florian Zellweger 13 Koenraad van Meerbeek 28
Abstract : Ecological research heavily relies on coarse-gridded climate data based on standardized temperature measurements recorded at 2 m height in open landscapes. However, many organisms experience environmental conditions that differ substantially from those captured by these macroclimatic (i.e. free air) temperature grids. In forests, the tree canopy functions as a thermal insulator and buffers sub-canopy microclimatic conditions, thereby affecting biological and ecological processes. To improve the assessment of climatic conditions and climate-change-related impacts on forest-floor biodiversity and functioning, high-resolution temperature grids reflecting forest microclimates are thus urgently needed. Combining more than 1200 time series of in situ near-surface forest temperature with topographical, biological and macroclimatic variables in a machine learning model, we predicted the mean monthly offset between sub-canopy temperature at 15 cm above the surface and free-air temperature over the period 2000-2020 at a spatial resolution of 25 m across Europe. This offset was used to evaluate the difference between microclimate and macroclimate across space and seasons and finally enabled us to calculate mean annual and monthly temperatures for European forest understories. We found that sub-canopy air temperatures differ substantially from free-air temperatures, being on average 2.1 degrees C (standard deviation +/- 1.6 degrees C) lower in summer and 2.0 degrees C higher (+/- 0.7 degrees C) in winter across Europe. Additionally, our high-resolution maps expose considerable microclimatic variation within landscapes, not captured by the gridded macroclimatic products. The provided forest sub-canopy temperature maps will enable future research to model below-canopy biological processes and patterns, as well as species distributions more accurately.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03614155
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Soumis le : vendredi 13 mai 2022 - 17:17:59
Dernière modification le : samedi 14 mai 2022 - 03:11:36

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Stef Haesen, Jonas J. Lembrechts, Pieter de Frenne, Jonathan Lenoir, Juha Aalto, et al.. ForestTemp - Sub-canopy microclimate temperatures of European forests. Global Change Biology, Wiley, 2021, 27 (23), pp.6307-6319. ⟨10.1111/gcb.15892⟩. ⟨hal-03614155⟩

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