DBPapers
DOI: 10.5593/SGEM2014/B42/S19.043

COMPARISON OF MODELED AND OBSERVED RESULTS FOR TEMPERATURES AND PRECIPITATIONS OVER BULGARIA

T. Todorov, K. Malcheva,T. Denev
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-16-2 / ISSN 1314-2704, June 19-25, 2014, Book 4 ,Vol. 2, 327-334 pp

ABSTRACT
The use of climate models, global or regional, is a modern approach to diagnose and
predict the different weather and climate variables. Models become more and more
comprehensive in the parameterization of the physical processes in the atmosphere and accurate in computation of wind, temperature, precipitation, radiation and other fields and flows. The regional climate model RegCM, version 4.4rc8, is used in this work to calculate the mean monthly temperatures, monthly maximum and minimum extreme temperatures as well as monthly total precipitations for years 2000 and 2005. They are compared with the observations at 19 stations, situated in different climate regions over Bulgaria. For this purpose the model (in a sub-grid mode with horizontal grid step 10 km) is used after some adjustments towards input parameters used, mainly in the choice of different cumulus convection parameterization schemes, in order to obtain better results for representations. The comparison shows that the model needs of further adjustment in order to improve the results. This requires sensitivity experiments, including global dataset change. The model uses the initial and boundary condition from the global climate models, in this case the re-analyses from EIN15 dataset. Some of the results are presented in figures using the visualization package GrADS.

Keywords: regional climate model, sub-grid modeling, climate, comparison,
temperature, precipitation, extreme