Towards coupling a 3D hydrodynamic lake model with the Canadian Regional Climate Model: Simulation on Great Slave Lake

Recently, it has been recognized that large lakes exert considerable influence on regional climate systems and vice versa and that the Canadian Regional Climate Model (CRCM), which does not currently have a lake component, requires the development of a coupled lake sub-model. Prior to a full effort for this model development, however, studies are needed to select and assess the suitability of a lake hydrodynamic model in terms of its capability to couple with the CRCM. This paper evaluates the performance of the 3-dimensional hydrodynamic model ELCOM on Great Slave Lake, one of Canada's largest lakes in the northern climatic system. Model simulations showed dominant circulation patterns that can create relatively large spatial and temporal gradients in temperature. Simulated temperatures compared well with cross-lake temperature observations both at the surface and vertically. Sensitivity analysis was applied to determine the critical meteorological variables affecting simulations of temperature and surface heat fluxes. For example, a 10% increase in air temperature and solar radiation was found to result in a 3.1% and 8.3% increase in water surface temperature and 8.5% increase in latent heat flux. Knowledge of the model sensitivity is crucial for future research in which the hydrodynamic model coupled with the atmosphere will be forced from the CRCM output.

[1]  T. J. Simons.  Verification of Numerical Models of Lake Ontario. II. Stratified Circulations and Temperature Changes , 1975 .

[2]  H. Ritchie,et al.  The Mackenzie GEWEX study : The Water and Energy cycles of a major North American River basin , 1998 .

[3]  R. Laprise,et al.  Climate and climate change in western canada as simulated by the Canadian regional climate model , 1998 .

[4]  David J. Schwab,et al.  Generation of Three-Dimensional Lake Model Forecasts for Lake Erie* , 1998 .

[5]  Steven W. Hostetler,et al.  Interactive coupling of a lake thermal model with a regional climate model , 1993 .

[6]  D. Schwab,et al.  Initial Implementation of the Great Lakes Forecasting System: A Real-Time System for Predicting Lake Circulation and Thermal Structure , 1994 .

[7]  Peter D. Blanken,et al.  Over-Lake Meteorology and Estimated Bulk Heat Exchange of Great Slave Lake in 1998 and 1999 , 2003 .

[8]  David C.-L. Lam,et al.  Modeling as a Tool for Nutrient Management in Lake Erie: a Hydrodynamics Study , 2005 .

[9]  Stéphane Goyette,et al.  Application of the Canadian regional climate model to the Laurentian great lakes region: Implementation of a lake model , 2000 .

[10]  R. Laprise,et al.  Current and perturbed climate as simulated by the second-generation Canadian Regional Climate Model (CRCM-II) over northwestern North America , 2003 .

[11]  Roni Avissar,et al.  Simulations of the Summer Hydrometeorological Processes of Lake Kinneret , 2000 .

[12]  David C.-L. Lam,et al.  Potential Climate Change Effects on Great Lakes Hydrodynamics and Water Quality , 1999 .

[13]  J. Imberger,et al.  Modeling basin‐scale internal waves in a stratified lake , 2000 .

[14]  Karl J. Castleton,et al.  Investigating uncertainty and sensitivity in integrated, multimedia environmental models: tools for FRAMES-3MRA , 2005, Environ. Model. Softw..

[15]  N. Heaps,et al.  Three-dimensional coastal ocean models , 1987 .

[16]  David J. Schwab,et al.  Numerical Simulation of Internal Kelvin Waves and Coastal Upwelling Fronts , 1997 .

[17]  Peter D. Blanken,et al.  CROSS-LAKE VARIATION OF PHYSICAL LIMNOLOGICAL AND CLIMATOLOGICAL PROCESSES OF GREAT SLAVE LAKE , 2000 .

[18]  David A. Swayne,et al.  Lake and climate models linkage: a 3-D hydrodynamic contribution , 2005 .

[19]  Anthony J. Jakeman,et al.  Sensitivity testing of a model for exploring water resources utilisation and management options , 2005, Environ. Model. Softw..

[20]  E. Halfon,et al.  Model of primary production, including circulation influences, in Lake Superior , 1978 .

[21]  Roberto Pastres,et al.  A comparison between the uncertainties in model parameters and in forcing functions: its application to a 3D water-quality model , 2005, Environ. Model. Softw..