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Citation

Lembrechts JJ, van den Hoogen J, Aalto J, Ashcroft MB, De Frenne P, Kemppinen J, Kopeck? M, Luoto M, Maclean IMD, Crowther TW, Bailey JJ, Haesen S, Klinges DH, Niittynen P & Jump AS (2022) Global maps of soil temperature. Global Change Biology, 28 (9), pp. 3110-3144. https://doi.org/10.1111/gcb.16060

Abstract
Research in global change ecology relies heavily on global climatic grids derived from estimates of air temperature in open areas at around 2 m above the ground. These climatic grids do not reflect conditions below vegetation canopies and near the ground surface, where critical ecosystem functions occur and most terrestrial species reside. Here, we provide global maps of soil temperature and bioclimatic variables at a 1-km? resolution for 0–5 and 5–15 cm soil depth. These maps were created by calculating the difference (i.e., offset) between in-situ soil temperature measurements, based on time series from over 1200 1-km? pixels (summarized from 8500 unique temperature sensors) across all the world’s major terrestrial biomes, and coarse-grained air temperature estimates from ERA5-Land (an atmospheric reanalysis by the European Centre for Medium-Range Weather Forecasts). We show that mean annual soil temperature differs markedly from the corresponding gridded air temperature, by up to 10°C (mean = 3.0 ± 2.1°C), with substantial variation across biomes and seasons. Over the year, soils in cold and/or dry biomes are substantially warmer (+3.6 ± 2.3°C) than gridded air temperature, whereas soils in warm and humid environments are on average slightly cooler (-0.7 ± 2.3°C). The observed substantial and biome-specific offsets emphasize that the projected impacts of climate and climate change on near-surface biodiversity and ecosystem functioning are inaccurately assessed when air rather than soil temperature is used, especially in cold environments. The global soil-related bioclimatic variables provided here are an important step forward for any application in ecology and related disciplines. Nevertheless, we highlight the need to fill remaining geographic gaps by collecting more in-situ measurements of microclimate conditions to further enhance the spatiotemporal resolution of global soil temperature products for ecological applications.

Keywords
bioclimatic variables; global maps; microclimate; near-surface temperatures; soil temperature; soil-dwelling organisms; temperature offset; weather stations

Notes
Additional co-authors: Brett R. Scheffers, Koenraad Van Meerbeek, Peter Aartsma, Otar Abdalaze, Mehdi Abedi, Rien Aerts, Negar Ahmadian, Antje Ahrends, Juha M. Alatalo, Jake M. Alexander, Camille Nina Allonsius, Jan Altman, Christof Ammann, Christian Andres, Christopher Andrews, Jonas Ard?, Nicola Arriga, Alberto Arzac, Valeria Aschero, Rafael L. Assis, Jakob Johann Assmann, Maaike Y. Bader, Khadijeh Bahalkeh, Peter Baran?ok, Isabel C. Barrio, Agustina Barros, Matti Barthel, Edmund W. Basham, Marijn Bauters, Manuele Bazzichetto, Luca Belelli Marchesini, Michael C. Bell, Juan C. Benavides, José Luis Benito Alonso, Bernd J. Berauer, Jarle W. Bjerke, Robert G. Bj?rk, Mats P. Bj?rkman, Katrin Bj?rnsdóttir, Benjamin Blonder, Pascal Boeckx, Julia Boike, Stef Bokhorst, Bárbara N. S. Brum, Josef Br?na, Nina Buchmann, Pauline Buysse, José Luís Camargo, Otávio C. Campoe, Onur Candan, Rafaella Canessa, Nicoletta Cannone, Michele Carbognani, Jofre Carnicer, Angélica Casanova-Katny, Simone Cesarz, Bogdan Chojnicki, Philippe Choler, Steven L. Chown, Edgar F. Cifuentes, Marek ?iliak, Tamara Contador, Peter Convey, Elisabeth J. Cooper, Edoardo Cremonese, Salvatore R. Curasi, Robin Curtis, Maurizio Cutini, C. Johan Dahlberg, Gergana N. Daskalova, Miguel Angel de Pablo, Stefano Della Chiesa, Jürgen Dengler, Bart Deronde, Patrice Descombes, Valter Di Cecco, Michele Di Musciano, Jan Dick, Romina D. Dimarco, Jiri Dolezal, Ellen Dorrepaal, Ji?í Du?ek, Nico Eisenhauer, Lars Eklundh, Todd E. Erickson, Brigitta Erschbamer, Werner Eugster, Robert M. Ewers, Dan A. Exton, Nicolas Fanin, Fatih Fazlioglu, Iris Feigenwinter, Giuseppe Fenu, Olga Ferlian, M. Rosa Fernández Calzado, Eduardo Fernández-Pascual, Manfred Finckh, Rebecca Finger Higgens, T'ai G. W. Forte, Erika C. Freeman, Esther R. Frei, Eduardo Fuentes-Lillo, Rafael A. García, María B. García, Charly Géron, Mana Gharun, Dany Ghosn, Khatuna Gigauri, Anne Gobin, Ignacio Goded, Mathias Goeckede, Felix Gottschall, Keith Goulding, Sanne Govaert, Bente Jessen Graae, Sarah Greenwood, Caroline Greiser, Achim Grelle, Benoit Guénard, Mauro Guglielmin, Joannès Guillemot, Peter Haase, Sylvia Haider, Aud H. Halbritter, Maroof Hamid, Albin Hammerle, Arndt Hampe, Siri V. Haugum, Lucia Hederová, Bernard Heinesch, Carole Helfter, Daniel Hepenstrick, Maximiliane Herberich, Mathias Herbst, Luise Hermanutz, David S. Hik, Raúl Hoffrén, Jürgen Homeier, Lukas H?rtnagl, Toke T. H?ye, Filip Hrbacek, Kristoffer Hylander, Hiroki Iwata, Marcin Antoni Jackowicz-Korczynski, Hervé Jactel, J?rvi J?rveoja, Szymon Jastrz?bowski, Anke Jentsch, Juan J. Jiménez, Ingibj?rg S. Jónsdóttir, Tommaso Jucker, Radoslaw Juszczak, Róbert Kanka, Vít Ka?par, George Kazakis, Julia Kelly, Anzar A. Khuroo, Leif Klemedtsson, Marcin Klisz, Natascha Kljun, Alexander Knohl, Johannes Kobler, Jozef Kollár, Martyna M. Kotowska, Bence Kovács, Juergen Kreyling, Andrea Lamprecht, Simone I. Lang, Christian Larson, Keith Larson, Kamil Laska, Guerric le Maire, Rachel I. Leihy, Luc Lens, Bengt Liljebladh, Annalea Lohila, Juan Lorite, Benjamin Loubet, Joshua Lynn, Martin Macek, Roy Mackenzie, Enzo Magliulo, Regine Maier, Francesco Malfasi, Franti?ek Máli?, Matěj Man, Giovanni Manca, Antonio Manco, Tanguy Manise, Paraskevi Manolaki, Felipe Marciniak, Radim Matula, Ana Clara Mazzolari, Sergiy Medinets, Volodymyr Medinets, Camille Meeussen, Sonia Merinero, Rita de Cássia Guimar?es Mesquita, Katrin Meusburger, Filip J. R. Meysman, Sean T. Michaletz, Ann Milbau, Dmitry Moiseev, Pavel Moiseev, Andrea Mondoni, Ruth Monfries, Leonardo Montagnani, Mikel Moriana-Armendariz, Umberto Morra di Cella, Martin M?rsdorf, Jonathan R. Mosedale, Lena Muffler, Miriam Mu?oz-Rojas, Jonathan A. Myers, Isla H. Myers-Smith, Laszlo Nagy, Marianna Nardino, Ilona Naujokaitis-Lewis, Emily Newling, Lena Nicklas, Georg Niedrist, Armin Niessner, Mats B. Nilsson, Signe Normand, Marcelo D. Nosetto, Yann Nouvellon, Martin A. Nu?ez, Romà Ogaya, Jér?me Ogée, Joseph Okello, Janusz Olejnik, J?rgen Eivind Olesen, ?ystein Opedal, Simone Orsenigo, Andrej Palaj, Timo Pampuch, Alexey V. Panov, Meelis P?rtel, Ada Pastor, Aníbal Pauchard, Harald Pauli, Marian Pavelka, William D. Pearse, Matthias Peichl, Lo?c Pellissier, Rachel M. Penczykowski, Josep Penuelas, Matteo Petit Bon, Alessandro Petraglia, Shyam S. Phartyal, Gareth K. Phoenix, Casimiro Pio, Andrea Pitacco, Camille Pitteloud, Roman Plichta, Francesco Porro, Miguel Portillo-Estrada, Jér?me Poulenard, Rafael Poyatos, Anatoly S. Prokushkin, Radoslaw Puchalka, Mihai Pu?ca?, Dajana Radujkovi?, Krystal Randall, Amanda Ratier Backes, Sabine Remmele, Wolfram Remmers, David Renault, Anita C. Risch, Christian Rixen, Sharon A. Robinson, Bjorn J.M. Robroek, Adrian V. Rocha, Christian Rossi, Graziano Rossi, Olivier Roupsard, Alexey V. Rubtsov, Patrick Saccone, Clotilde Sagot, Jhonatan Sallo Bravo, Cinthya C. Santos, Judith M. Sarneel, Tobias Scharnweber, Jonas Schmeddes, Marius Schmidt, Thomas Scholten, Max Schuchardt, Naomi Schwartz, Tony Scott, Julia Seeber, Ana Cristina Segalin de Andrade, Tim Seipel, Philipp Semenchuk, Rebecca A. Senior, Josep M. Serra-Diaz, Piotr Sewerniak, Ankit Shekhar, Nikita V. Sidenko, Lukas Siebicke, Laura Siegwart Collier, Elizabeth Simpson, David P. Siqueira, Zuzana Sitková, Johan Six, Marko Smiljanic, Stuart W. Smith, Sarah Smith-Tripp, Ben Somers, Mia Vedel S?rensen, José Jo?o L. L. Souza, Bartolomeu Israel Souza, Arildo Souza Dias, Marko J. Spasojevic, James D. M. Speed, Fabien Spicher, Angela Stanisci, Klaus Steinbauer, Rainer Steinbrecher, Michael Steinwandter, Michael Stemkovski, J?rg G. Stephan, Christian Stiegler, Stefan Stoll, Martin Svátek, Miroslav Svoboda, Torbern Tagesson, Andrew J. Tanentzap, Franziska Tanneberger, Jean-Paul Theurillat, Haydn J. D. Thomas, Andrew D. Thomas, Katja Tielb?rger, Marcello Tomaselli, Urs Albert Treier, Mario Trouillier, Pavel Dan Turtureanu, Rosamond Tutton, Vilna A. Tyystj?rvi, Masahito Ueyama, Karol Ujházy, Mariana Ujházyová, Domas Uogintas, Anastasiya V. Urban, Josef Urban, Marek Urbaniak, Tudor-Mihai Ursu, Francesco Primo Vaccari, Stijn Van de Vondel, Liesbeth van den Brink, Maarten Van Geel, Vigdis Vandvik, Pieter Vangansbeke, Andrej Varlagin, G.F. Veen, Elmar Veenendaal, Susanna E. Venn, Hans Verbeeck, Erik Verbrugggen, Frank G.A. Verheijen, Luis Villar, Luca Vitale, Pascal Vittoz, Maria Vives-Ingla, Jonathan von Oppen, Josefine Walz, Runxi Wang, Yifeng Wang, Robert G. Way, Ronja E. M. Wedeg?rtner, Robert Weigel, Jan Wild, Matthew Wilkinson, Martin Wilmking, Lisa Wingate, Manuela Winkler, Sonja Wipf, Georg Wohlfahrt, Georgios Xenakis, Yan Yang, Zicheng Yu, Kailiang Yu, Florian Zellweger, Jian Zhang, Zhaochen Zhang, Peng Zhao, Klaudia Ziemblińska, Reiner Zimmermann, Shengwei Zong, Viacheslav I. Zyryanov, Ivan Nijs, Jonathan Lenoi

Journal
Global Change Biology: Volume 28, Issue 9

• Published version