Advances in Science and Research www.adv-sci-res.net 1992-0628 1992-0636 3 8th EMS Annual Meeting and 7th European Conference on Applied Climatology 2008 2009 10.5194/asr-3-63-2009 http://www.adv-sci-res.net/3/63/2009/ http://www.adv-sci-res.net/3/63/2009/asr-3-63-2009.html http://www.adv-sci-res.net/3/63/2009/asr-3-63-2009.pdf 63 71 2009-04-29 Estimating local records for Northern and Central Italy from a sparse secular temperature network and from 1961–1990 climatologies M. Brunetti G. Lentini M. Maugeri maurizio.maugeri@unimi.it T. Nanni C. Simolo J. Spinoni Istituto per le Scienze dell'Atmosfera e del Clima, CNR, via Gobetti 101, 40129 Bologna, Italy Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, 20133 Milano, Italy The paper presents monthly 30-arc-second-resolution Northern and Central Italy temperature climatologies and discusses the procedure we adopt to superimpose the information of temperature secular records onto these climatologies. The climatologies are obtained by means of a step-wise linear regression method which aims at determining the temperature dependence on geographical and morphological variables. Such a method is applied to a database of about 800 monthly 1961–1990 temperature normals. In the first regression (temperature vs. elevation) the recorded data are considered; the further regressions concern the residuals obtained after taking into account the effect of each variable, in order of importance. An estimated secular anomaly record can be obtained for each point of the climatology grid by means of a distance-weighted average of the temperature anomaly records of the stations surrounding the grid point. Auer, I., Böhm, R., Hiebl, J., Schöner, W., Spinoni, J., Lentini, G., Maugeri, M., Brunetti, M., Nanni, T., Perèec Tadiæ, M., and Bihari, Z.: Final Report of the ECSN Project "HRT/GAR - High Resolution Temperature Climatology in Complex Terrain – demonstrated in the test area Greater Alpine Region Gar. Final Report and Annexes 1–4, http://www.zamg.ac.at/forschung/klimatologie/klimamodellierung/ecsn_hrt-gar/, 2008. Brunetti, M., Maugeri, M., Monti, F., and Nanni T.: Temperature and precipitation variability in Italy in the last two centuries from homogenised instrumental time series, Int. J. Climatol., 26, 345–381, 2006. Daly, C., Halbleib, M., Smith, J. I., Gibson, W. P., Doggett, M. K., Taylor, G. H., Curtis, J., and Pasteris, P. A.: Physiographically-sensitive mapping of temperature and precipitation across the conterminous United States, Int. J. Climatol., 28, 2031–2064, doi:10.1002/joc.1688, 2008. Hiebl, J., Auer, I., Böhm, R., Schöner, W., Maugeri, M., Lentini, G., Spinoni, J., Brunetti, M., Nanni, T., Percec Tadiæ, M., Bihari, Z., Dolinar, M., and Müller-Westermeier, G.: A high-resolution 1961–1990 monthly temperature climatology for the greater Alpine region, Meteorol. Z., submitted, 2009. Mitchell, T. D. and Jones, P. D.: An improved method of constructing a database of monthly climate observations and associated high-resolution grids, Int. J. Climatol., 25, 693–712, 2005. New, M., Hulme, M., and Jones, P. D.: Representing twentieth century space-time variability. Part 2: development of 1901–96 monthly grids of surface climate, J. Climate, 13, 2217–2238, 2000. Petrarca, S., Spinelli, F., Cogliani, E., and Mancini, M.: Profilo Climatico dell'Italia, ENEA, http://clisun.casaccia.enea.it/Pagine/Profilo.htm (last access: 28~April~2009), 1999 (in Italian). Servizio Idrografico: Distribuzione della temperatura dell'aria in Italia nel trentennio 1926–1955. Pubblicazione N. 21 del Servizio Idrografico del Ministero dei Lavori Pubblici, 1966 (in Italian). USGS (United States Geological Survey): GTOPO30 Documentation, http://edc.usgs.gov/products/elevation/gtopo30/README.html (last access: 28~April~2009), 1996.