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Results from a Full Coupling of the Hirham Regional Climate Model and the Mike She Hydrological Model for a Danish Catchment : Volume 11, Issue 3 (14/03/2014)

By Larsen, M. A. D.

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Book Id: WPLBN0004012045
Format Type: PDF Article :
File Size: Pages 43
Reproduction Date: 2015

Title: Results from a Full Coupling of the Hirham Regional Climate Model and the Mike She Hydrological Model for a Danish Catchment : Volume 11, Issue 3 (14/03/2014)  
Author: Larsen, M. A. D.
Volume: Vol. 11, Issue 3
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Butts, M. B., Refsgaard, J. C., Drews, M., Christensen, J. H., Christensen, O. B., Jensen, K. H., & D. Larse, M. A. (2014). Results from a Full Coupling of the Hirham Regional Climate Model and the Mike She Hydrological Model for a Danish Catchment : Volume 11, Issue 3 (14/03/2014). Retrieved from

Description: Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen, Denmark. In recent years research on the coupling of existing regional climate models and hydrology/land surface models has emerged. A major challenge in this emerging research field is the computational interaction between the models. In this study we present results from a full two-way coupling of the HIRHAM regional climate model over a 4000 km x 2800 km domain in 11 km resolution and the combined MIKE SHE-SWET hydrology and land surface models over the 2500 km2 Skjern river catchment. A total of 26 one-year runs were performed to assess the influence of the data transfer interval (DTI) between the two models and the internal HIRHAM model variability of ten variables. In general, the coupled model simulations exhibit less accurate performance than the uncoupled simulations which is to be expected as both models prior to this study have been individually refined or calibrated to reproduce observations. Four of six output variables from HIRHAM, precipitation, relative humidity, wind speed and air temperature, showed statistically significant improvements in RMSE with a reduced DTI as evaluated in the range of 12–120 min. For these four variables the perturbation induced HIRHAM variability was shown to correspond to 47% of the RMSE improvement when using a DTI of 120 min compared to a DTI of 12 min and the variability resulted in large ranges in simulated precipitation. Also, the DTI was shown to substantially affect computation time. The MIKE SHE energy flux and discharge output variables experienced little impact from the DTI.

Results from a full coupling of the HIRHAM regional climate model and the MIKE SHE hydrological model for a Danish catchment

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