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| Keywords: Global temperature 1ka.png Description Global temperature Axes are not labelled in order to keep the diagram language neutral; x-axis year A D 1000 2004 y-axis global temperature in °C The black line is the smoothed global mean The grey area is the smoothed 95 confidence interval of the estimates The blue line is the regression line for the period 1000 1899 The red line is the regression line for the period 1900 2004 <br>The diagram illustrates several aspects of global warming The rapid increase as well as the earlier slow decrease is statistically highly significant One can also see that the 1990s most probably have been the last millenium's warmest decade <br>Caution is required in interpretation however because the data prior to 1881 are estimates based on proxies such as tree rings and ice cores This makes both the accuracy and the temporal resolution of the estimates poorer than for the last century Single years most certainly lay outside the confidence intervals This does probably not affect the above conclusion about the 1990 decade however Source graph drawn by Hanno using data from two sources For the years 1000 1880 temperature estimates were taken from P D Jones M E Mann 2004 Climate over past millenia Reviews of Geophysics 42 article number RG2002 For the remainder temperatures are based on instrumental records published on the web by P D Jones D E Parker T J Osborn K R Briffa 2005 as Global and hemispheric temperature anomalies land and marine instrumental records In Trends A Compendium of Data on Global Change Carbon Dioxide Information Analysis Center Oak Ridge National Laboratory U S Department of Energy Oak Ridge Tenn U S A http //cdiac esd ornl gov/trends/temp/jonescru/jones html Licence released into the public domain by the originator diagram Global warming graphs Time series | ||||
