Discrepancies of surface temperature trends in the CMIP5 simulations and observations on the global and regional scales
L. Zhao1,2, J. Xu2, and A. M. Powell Jr.31Nanjing University of Information Science and Technology, Nanjing, China 2Environmental Science and Technological Center, College of Science, George Mason University, Fairfax, Virginia, USA 3NOAA/NESDIS/STAR, College Park, Maryland, USA
Received: 03 Oct 2013 – Accepted for review: 22 Oct 2013 – Discussion started: 01 Nov 2013
Abstract. Using the fifth Coupled Model Intercomparison Project (CMIP5) model simulations and two observational datasets, the surface temperature trends and their discrepancies have been examined. The temporal-spatial characteristics for the surface temperature trends are discussed. Different from a constant estimated linear trend for the entire simulation period of 1850–2012, a dynamical trend using running linear least squares fitting with the moving 10 yr time windows are calculated. The results show that the CMIP5 model simulations are generally in good agreement with the observational measurements for the global scale warming, but the temperature trends depend on the temporal change and the regional differences. Generally, contrary to the small discrepancies on the global scale, the large discrepancies are observed in the south- and north-polar regions and other sub-regions.
Zhao, L., Xu, J., and Powell Jr., A. M.: Discrepancies of surface temperature trends in the CMIP5 simulations and observations on the global and regional scales, Clim. Past Discuss., 9, 6161-6178, doi:10.5194/cpd-9-6161-2013, 2013.