Terry V. Callaghan,^* Margareta Johansson,^** Jeff Key,^*** Terry Prowse,^**** Maria Ananicheva,^***** Alexander Klepikov<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 UV-B radiation impacts on arctic ecosystems. Address: Royal Swedish Academy of Sciences, 104 05 Stockholm, Sweden. e-mail: terry_callaghan@btinternet.com
^**Margareta Johansson is a Research Scientist at the Department of Earth and Ecosystem Sciences, Lund University and at the Royal Swedish Academy of Sciences, Stockholm, Sweden. She specializes in permafrost dynamics in relation to climate change and its impact on ecosystems. Address: Division of Physical Geography and Ecosystem Analyses, Department of Earth and Ecosystem Sciences, Lund University, Sölvegatan 12, 223 62 Lund, Sweden. e-mail: margareta.johansson@nateko.lu.se
^***Jeff Key is a Research Scientist with the US National Oceanic and Atmospheric Administration's Satellite and Information Service, and is Chief of the Advanced Satellite Products Branch. He specializes in satellite remote sensing of snow, ice, and clouds in the Polar Regions. Address: NOAA/NESDIS, 1225 West Dayton Street, Madison, WI 53706, USA. e-mail: Jeff.Key@noaa.gov
^****Terry Prowse is a senior Research Scientist with Environment Canada and a Professor in the Department of Geography at the University of Victoria. His research focuses on the effects of climate variability and change on cold-regions hydrology, hydro-climatology, and hydro-ecology. Address: Environment Canada, Department of Geography, University of Victoria, Victoria, BC V8P 5C2, Canada. e-mail: terry.prowse@ec.gc.ca
^*****Maria Ananicheva is a senior Research Scientist in the Institute of Geography, Glaciological Department, Russian Academy of Sciences. Her area of interest is glacio-climatology, mountain glacier change study in the Russian Arctic, contemporary mass balance of glaciers and projection for the near future by AOGCM scenarios. Address: Institute of Geography, Russian Academy of Sciences, Staromonetny per 29, Moscow, Russia 119017. e-mail: maria_anan@rambler.ru
^******Alexander Klepikov is a Physical Oceanographer who works as a senior scientist at the Arctic and Antarctic Research Institute in St. Petersburg, Russia. He is currently the head of Department for the Antarctic Oceanography and Climate Studies. His research interests include physical oceanography, modeling of the Arctic and Southern Oceans, and polar climate dynamics. Address: Arctic and Antarctic Research Institute, 38 Bering Street, St. Petersburg, Russia 199397. e-mail: klep@aari.ru