Theoretical and Applied Climatology

, Volume 113, Issue 1, pp 187–196

Mixed nonlinear regression for modelling historical temperatures in Central–Southern Italy

  • Nazzareno Diodato
  • Gianni Bellocchi
  • Chiara Bertolin
  • Dario Camuffo
Original Paper

DOI: 10.1007/s00704-012-0775-y

Cite this article as:
Diodato, N., Bellocchi, G., Bertolin, C. et al. Theor Appl Climatol (2013) 113: 187. doi:10.1007/s00704-012-0775-y

Abstract

This paper has exploited, for Central and Southern Italy (Mediterranean Sub-regional Area), an unprecedented historical dataset as an attempt to model seasonal (winter and summer) air temperatures in pre-instrumental time (back to 1500). Combining information derived from proxy–documentary data and large-scale simulation, a statistical downscaling approach in the form of mixed regression model was developed to adapt larger-scale estimations (regional component) to the sub-regional temperature pattern (local component). It interprets local temperature anomalies by means of monthly based Temperature Anomaly Scaled Index in the range −5 (very cold conditions in June) to 2 (very warm conditions). The modelled response agrees well with the independent data from the validation sample (Nash–Sutcliffe efficiency coefficient, >0.60). The advantage of the approach is not merely increased accuracy in estimation. Rather, it relies on the ability to extract (and exploit) the right information to replicate coherent temperature series in historical times.

Copyright information

© Springer-Verlag Wien 2012

Authors and Affiliations

  • Nazzareno Diodato
    • 1
  • Gianni Bellocchi
    • 1
    • 2
  • Chiara Bertolin
    • 3
  • Dario Camuffo
    • 3
  1. 1.MetEROBS-Met European Research Observatory, GEWEX-CEOP NetworkWorld Climate Research ProgrammeBeneventoItaly
  2. 2.Grassland Ecosystem Research UnitFrench National Institute of Agricultural ResearchClermont-FerrandFrance
  3. 3.Atmosphere and Ocean Science InstituteNational Research Council of ItalyPaduaItaly