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Bias Correction of Climate Model’s Precipitation Using the Copula Method and Its Application in River Basin Simulation

1
Department of Meteorology Climatology, School of Geology Aristotle, University of Thessaloniki, GR54124 Thessaloniki, Greece
2
Department of Civil Engineering Aristotle, University of Thessaloniki, GR54124 Thessaloniki, Greece
*
Author to whom correspondence should be addressed.
Water 2019, 11(3), 600; https://doi.org/10.3390/w11030600
Received: 9 February 2019 / Revised: 20 March 2019 / Accepted: 20 March 2019 / Published: 22 March 2019
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Abstract

During the last few decades, the utilization of the data from climate models in hydrological studies has increased as they can provide data in the regions that lack raw meteorological information. The data from climate models data often present biases compared to the observed data and consequently, several methods have been developed for correcting statistical biases. The present study uses the copula for modeling the dependence between the daily mean and total monthly precipitation using E-OBS data in the Mesta/Nestos river basin in order to use this relationship for the bias correction of the MPI climate model monthly precipitation. Additionally, both the non-corrected and bias corrected data are tested as they are used as the inputs to a spatial distributed hydrological model for simulating the basin runoff. The results showed that the MPI model significantly overestimates the E-OBS data while the differences are reduced sufficiently after the bias correction. The outputs from the hydrological models were proven to coincide with the precipitation analysis results and hence, the simulated discharges in the case of copula corrected data present an increased correlation with the observed flows. View Full-Text
Keywords: copula; MPI regional climate model; precipitation; bias correction; hydrological simulation copula; MPI regional climate model; precipitation; bias correction; hydrological simulation
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Lazoglou, G.; Anagnostopoulou, C.; Skoulikaris, C.; Tolika, K. Bias Correction of Climate Model’s Precipitation Using the Copula Method and Its Application in River Basin Simulation. Water 2019, 11, 600.

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