Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-245
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Development and technical paper
10 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
The regional climate model REMO (v2015) coupled with the 1-D freshwater model FLake (v1): Fenno-Scandinavian climate and lakes
Joni-Pekka Pietikäinen1, Tiina Markkanen1, Kevin Sieck2, Daniela Jacob2, Johanna Korhonen3, Petri Räisänen1, Yao Gao1, Jaakko Ahola1, Hannele Korhonen1, Ari Laaksonen1, and Jussi Kaurola1 1Finnish Meteorological Institute, P.O. Box 503, 00101, Helsinki, Finland
2Climate Service Center Germany, Chilehaus - Eingang B, Fischertwiete 1, 20095, Hamburg, Germany
3Finnish Environment Institute SYKE, P.O. Box 140, 00251, Helsinki, Finland
Abstract. The regional climate model REMO was coupled with the FLake lake model to include an interactive treatment of lakes. Using this new version, the Fenno-Scandinavian climate and lake characteristics were studied in a set of 35-year hindcast simulations. Additionally, sensitivity tests related to the parameterization of snow albedo were conducted. Our results show that overall the new model version improves the representation of the Fenno-Scandinavian climate in terms of 2-m temperature and precipitation, but the downside is that an existing wintertime cold bias in the model is enhanced. The lake surface water temperature, ice depth and ice season length were analyzed in detail for ten Finnish, four Swedish, two Russian and one Estonian lakes. The results show that the model can reproduce these characteristic with reasonably high accuracy. The cold bias during winter causes e.g. overestimation of ice layer thickness at several of the studied lakes, but overall the values from the model are realistic and represent well the lake physics in a long-term simulation. We also analyzed the snow depth on ice from ten Finnish lakes and vertical temperature profiles from five Finnish lakes and the model results are in realistic.

Citation: Pietikäinen, J.-P., Markkanen, T., Sieck, K., Jacob, D., Korhonen, J., Räisänen, P., Gao, Y., Ahola, J., Korhonen, H., Laaksonen, A., and Kaurola, J.: The regional climate model REMO (v2015) coupled with the 1-D freshwater model FLake (v1): Fenno-Scandinavian climate and lakes, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-245, in review, 2017.
Joni-Pekka Pietikäinen et al.
Joni-Pekka Pietikäinen et al.
Joni-Pekka Pietikäinen et al.

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Short summary
The regional climate model REMO was coupled with the FLake lake model to include an interactive treatment of lakes. Using this new version, the Fenno-Scandinavian climate and lake characteristics were studied. Our results show that overall the new model version improves the representation of the Fenno-Scandinavian climate in terms of 2-m temperature and precipitation, and that the model can reproduce surface water temperature, ice depth and ice season length with reasonably high accuracy.
The regional climate model REMO was coupled with the FLake lake model to include an interactive...
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