A Holocene hydrologic model of the Crow Wing Watershed, Minnesota

A Coupled Land Atmosphere Simulation Program (CLASP), capable of evaluating surface water-aquifer-atmosphere interactions at the regional scale (up to 400 X 400 km(2)), will be used to evaluate paleo-watershed conditions at 6 000 BP. The CLASP model couples a single-column vertically-discretized atmo spheric model to a finely discretized land surface and subsurface hydrologi c model (MODFLOW). The model can be driven by observational data or atmosph eric general circulation model (AGCM) output. By simulating the hydrologic fluctuations of individual lakes and streams, the model permits a comprehen sive evaluation of paleo AGCM model reconstruction of Holocene climate chan ge at the regional scale. Calculated lake level fluctuations will be compar ed to lake core records. Preliminary results illustrate the importance of a quifer hydraulic conductivity in paleo-lake level response. (C) 2000 Elsevi er Science B.V. All rights reserved.