Simulation of the climate of the XX century in the Alpine space
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The purpose of this work is the analysis of the capabilities of the Limited Area Model COSMO-CLM in simulating the main features of the observed climate over an area characterized by complex orography. Two sets of simulations of the XX century climate have been carried out, at a spatial resolution of 14 km, in order to provide a detailed description of the climate variability on local scale, useful for impact studies. A first experimental set-up consists of a set of simulations driven by the boundary conditions provided by the global model SINTEX-G. Our aim is to test the capability of this experimental set in realistically reproducing the main characteristics of the Alpine region climate under present climate conditions in order to provide a reliable tool for future climate scenario investigations. A second set of simulations has been carried out, driven by ERA40 reanalysis, in order to test the influence of the global model boundary conditions. Results are shown in terms of 2-m temperature and total precipitation and they are compared with two observational datasets: CRU and ARPA Piedmont. A good capability of the model in reproducing both the mean field and the seasonal cycle of temperature is observed, while the precipitation is affected by accuracy problems, related to the resolution. Though the model resolution is fine enough to reproduce fairly well the intensity of winter precipitation, it often fails in its localization. As far as summer precipitation is concerned, the model resolution appears too coarse to simulate the localized convection, which characterizes summer precipitation over Alps.
KeywordsAlpine space Regional climate simulations Seasonal temperature and precipitation
The authors would like to thank Dr. Paola Mercogliano (CMCC) for the helpful suggestions provided and Dr. Myriam Montesarchio (CMCC) for the technical support. ARPA Piedmont is also gratefully acknowledged for the provision of observed dataset. This work has been funded by the INTERREG Project ADAPTALP. Finally the authors like to thank the Department for Sustainable Development, Climate and Energy of the Ministry of the Environment, Land and Sea of Italy for providing the opportunity to participate in this project.
- Doms G, Forstner J (2004) Development of a kilometre scale NWP-System: LMK. COSMO Newsl 4:159–167Google Scholar
- Faggian P, Giorgi F (2009) An analysis of global model projections over Italy, with particular attention to the Italian Greater Alpine Region (GAR). Clim Change. doi: 10.1007/s10584-009-9584-4
- Holton JR (2004) An introduction to dynamic meteorology. Elsevier, Academic Press, San Diego, USAGoogle Scholar
- Kessler E (1969) On the distribution and continuity of water substance in atmospheric circulations. Meteor Monogr 10:84Google Scholar
- Madec G, Delecluse P, Imbard M, Lévy C (1998) OPA 8.1 Ocean general circulation model reference manual. Note du Pôle de modélisation, Institut Pierre-Simon Laplace, 11:91Google Scholar
- Roeckner E, et al. (1996) The atmospheric general circulation model Echam-4: model description and simulation of present day climate. Max Planck Institut fur Meteorologie, rep. 218:90Google Scholar
- Ronchi C, De Luigi C, Ciccarelli N, Loglisci N, 2008. Development of a daily gridded climatological air temperature dataset based on a optimal interpolation of ERA-40 reanalysis downscaling and a local high resolution thermometers network, In: Proceedings of EMS annual meeting—European conference on applied climatology (ECAC) 29 September–03 October 2008, Amsterdam (The Netherlands)Google Scholar
- Uppala SM et al (2006) The ERA-40 re-analysis. Quart J R Meteor Soc 612:2961–3012Google Scholar
- Valcke S (2006) OASIS3 User Guide (prism_2-5). PRISM Support Initiative 3:68Google Scholar