Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 11 4 2007 10.5194/hess-11-1279-2007 http://www.hydrol-earth-syst-sci.net/11/1279/2007/ http://www.hydrol-earth-syst-sci.net/11/1279/2007/hess-11-1279-2007.html http://www.hydrol-earth-syst-sci.net/11/1279/2007/hess-11-1279-2007.pdf 1279 1294 2007-05-03 Development of the MESH modelling system for hydrological ensemble forecasting of the Laurentian Great Lakes at the regional scale A. Pietroniro al.pietroniro@ec.gc.ca V. Fortin N. Kouwen C. Neal R. Turcotte B. Davison D. Verseghy E. D. Soulis R. Caldwell N. Evora P. Pellerin Water Science and Technology Directorate, Environment Canada, National Hydrology Research Center, Saskatoon SK Canada S7N 3H5, Canada Recherche en Prévision Numérique, Meteorological Research Division, Environment Canada, Canadian Meteorological Center Dorval QC Canada H9P 1J3, Canada Department of Civil Engineering, University of Waterloo, Waterloo ON Canada N2L 3G1, Canada Hydrological Applications and Services, Meteorological Service of Canada, Ottawa ON Canada K1N 1A1, Canada Centre d'expertise hydrique du Québec, Ministère du Développement durable, de l'Environnement et des Parcs, Gouvernement du Québec Quebec City QC Canada G1R 5V7, Canada Hydrometeorology and Arctic Laboratory, Meteorological Service of Canada, National Hydrology Research Center, Saskatoon SK Canada S7N 3H5, Canada Climate Research Division, Environment Canada, Toronto ON Canada M3H 5T4, Canada Great Lakes – St. Lawrence Regulation Office, Meteorological Service of Canada, Cornwall ON Canada K6H 6S2, Canada Institut de recherche d'Hydro-Québec, Varennes QC Canada J3X 1S1, Canada Environment Canada has been developing a community environmental modelling system (Modélisation Environmentale Communautaire – MEC), which is designed to facilitate coupling between models focusing on different components of the earth system. The ultimate objective of MEC is to use the coupled models to produce operational forecasts. MESH (MEC – Surface and Hydrology), a configuration of MEC currently under development, is specialized for coupled land-surface and hydrological models. To determine the specific requirements for MESH, its different components were implemented on the Laurentian Great Lakes watershed, situated on the Canada-US border. This experiment showed that MESH can help us better understand the behaviour of different land-surface models, test different schemes for producing ensemble streamflow forecasts, and provide a means of sharing the data, the models and the results with collaborators and end-users. 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