Geosci. Model Dev. Discuss., 5, 3993-4035, 2012
© Author(s) 2012. This work is distributed
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This discussion paper has been under review for the journal Geoscientific Model Development (GMD). Please refer to the corresponding final paper in GMD.
A one-dimensional model intercomparison study of thermal regime of a shallow turbid midlatitude lake
V. M. Stepanenko1, A. Martynov2, K. D. Jöhnk3, Z. M. Subin4,*, M. Perroud5,**, X. Fang6, F. Beyrich7, D. Mironov8, and S. Goyette9
1Moscow State University, Research Computing Center, GSP-1, 119234, Leninskie Gory, 1, bld. 4, Moscow, Russia
2Centre ESCER, Universite du Quebec a Montreal, 201 Av. du President-Kennedy Montreal, Canada
3CSIRO Land and Water, G.P.O. Box 1666, Canberra, ACT 2601, Australia
4Princeton Environmental Institute Guyot Hall, Room 129 Princeton, NJ 08544-1003, USA
5University of Michigan, Cooperative Institute for Limnology and Ecosystem Research, School of Natural Resources and Environment, Ann Arbor Michigan, USA
6Auburn University, Department of Civil Engineering, Auburn Alabama 36849-5337 USA
7Meteorologisches Observatorium Lindenberg (MOL), Deutscher Wetterdienst (DWD), Lindenberg, Germany
8Deutscher Wetterdienst, Forschung und Entwicklung, FE14, Frankfurter Str. 135, 63067 Offenbach am Main, Germany
9University of Geneva, Institut des Sciences de l'Environnement, Climatic Change and Climate Impacts, Geneva, Switzerland
*formerly at: Earth Sciences Division, Lawrence Berkeley National Lab, Berkeley, USA
**presently at: the Federal Office for the Environment, Papiermühlestrasse 172, 3063 Ittigen, Switzerland

Abstract. Results of a lake model intercomparison study conducted within the framework of Lake Model Intercomparison Project are presented. The investigated lake was Großer Kossenblatter See (Germany) as a representative of shallow (2 m mean depth) midlatitude turbid lakes. Meteorological measurements, including turbulent fluxes and water temperature, were carried out by the Lindenberg Meteorological Observatory of the German Meteorological Service (Deutscher Wetterdienst, DWD). Eight lake models of different complexity were run, forced by identical meteorological variables and model parameters unified as far as possible given different formulations of processes. All models generally captured diurnal and seasonal variability of lake surface temperature well. However, some models were incapable of realistically reproducing temperature stratification in summer. Total heat turbulent fluxes, computed by surface flux schemes of lake models, deviated on average from those measured by eddy covariance by 17–28 W m−2. To realistically represent lakes in numerical weather prediction and climate models, it is advisable to use depth-resolving turbulence models (or equivalent) in favour of models with a completely mixed temperature profile. While the effect of heat flux to bottom sediments can become significant for bottom temperatures, it has no important influence on the surface temperatures.

Citation: Stepanenko, V. M., Martynov, A., Jöhnk, K. D., Subin, Z. M., Perroud, M., Fang, X., Beyrich, F., Mironov, D., and Goyette, S.: A one-dimensional model intercomparison study of thermal regime of a shallow turbid midlatitude lake, Geosci. Model Dev. Discuss., 5, 3993-4035, doi:10.5194/gmdd-5-3993-2012, 2012.
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