Anthropogenic and natural causes of twentieth century temperature change |
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Authors: | Stott PA Tett SFB Jones GS Allen MR Ingram WJ Mitchell JFB |
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Institution: | (1) Met Office, UK Met Office, Bracknell, Hadley Centre for Climate Prediction and Research, Berks, UK, RG12 2SY;(2) Rutherford Appleton Laboratory, UK |
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Abstract: | We analyse spatio-temporal patterns of near-surface temperature change to provide an attribution of twentieth century climate change. We apply an ``optimal detection' methodology to seasonal and annual data averaged over a range of spatial and temporal scales. We find that solar effects may have contributed significantly to the warming in the first half of the century although this result is dependent on the reconstruction of total solar irradiance that is used. In the latter half of the century, we find that anthropogenic increases in greenhouses gases are largely responsible for the observed warming, balanced by some cooling due to anthropogenic sulphate aerosols, with no evidence for significant solar effects. |
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