The Mackenzie River is the largest North American source of freshwater for the Arctic Ocean. This basin is subjected to wide fluctuations in its climate and it is currently experiencing a pronounced warming trend. As a major Canadian contribution to the Global Energy and Water Cycle Experiment (GEWEX), the Mackenzie GEWEX Study (MAGS) is focusing on understanding and modeling the fluxes and reservoirs governing the flow of water and energy into and through the climate system of the Mackenzie River Basin. MAGS necessarily involves research into many atmospheric, land surface, and hydrological issues associated with cold climate systems. The overall objectives and scope of MAGS will be presented in this article.

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*Environment Canada, Downsview, Ontario, Canada.

+McGill University, Montreal, Quebec, Canada.

#Environment Canada, Saskatoon, Saskatchewan, Canada.

@University of Toronto, Toronto, Ontario, Canada.

&Environment Canada, Montreal, Quebec, Canada.

**McMaster University, Hamilton, Ontario, Canada.

++University of Waterloo, Waterloo, Ontario, Canada.

##Environment Canada, Edmonton, Alberta, Canada.