Terry V. Callaghan,^* Torben R. Christensen,^** Elin J. Jantze<sup>***


*</sup>Terry V. Callaghan () is a Distinguished Research Professor at the Royal Swedish Academy of Sciences and Professor of Arctic Ecology at the Universities of Sheffield, UK and Lund, Sweden. He specializes in arctic ecology, and climate and UA-B radiation impacts on arctic ecosystems. Address: Royal Swedish Academy of Sciences, PO Box 50005, 104 05 Stockholm, Sweden. Address: Department of Plant and Animal Sciences, Sheffield Centre for Arctic Ecology, University of Sheffield, Sheffield S10 5BR, UK. e-mail: terry_callaghan@btinternet.com
^**Torben R. Christensen is Professor at the Department of Earth and Ecosystem Sciences, Lund University, Sweden and at the Greenland Climate Research Centre, Nuuk, Greenland. He specializes in how vegetation and ecosystem processes respond and provide feedback effects on climate under changing environmental conditions. Address: Division of Physical Geography and Ecosystem Analyses, Department of Earth and Ecosystem Sciences, Lund University, Sölvegatan 12, 223 62 Lund, Sweden. e-mail: torben.christensen@nateko.lu.se
^***Elin J. Jantze is a PhD student at the Department of Physical Geography and Quaternary Geology of Stockholm University, Sweden. She specialises on the role of the cryosphere, hydrological and ecosystem shifts for arctic hydro-climatic interactions and carbon fluxes. Address: Department of Physical Geography and Quaternary Geology, Stockholm University, Svante Arrhenius väg 8, 106 91 Stockholm, Sweden. e-mail: elin.jantze@natgeo.su.se