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Land surface air temperature anomalies relative to 1961-1990: CRUTEM3 (Brohan et al. 2006, blue) Brohan, P., J.J. Kennedy, I. Harris, S.F.B. Tett and P.D. Jones, Uncertainty estimates in regional and global observed temperature changes: a new dataset from 1850. J. Geophys. Res, 111, D12106, doi:10.1029/2005JD006548. http://hadobs.metoffice.com/crutem3/diagnostics/global/nh+sh/annual

Land surface air temperature anomalies relative to 1961-1990: NASA GISS (Hansen et al. 2001, green) Hansen, J., R. Ruedy, M. Sato, M. Imhoff, W. Lawrence, D. Easterling, T. Peterson, and T. Karl, 2001: A closer look at United States and global surface temperature change. J. Geophys. Res. 106, 23947-23963. http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts.txt

Land surface air temperature anomalies relative to 1961-1990: Lugina et al. (2005, red). Lugina, K.M., P.Ya. Groisman, K.Ya. Vinnikov, V.V. Koknaeva, and N.A. Speranskaya 2005: Monthly surface air temperature time series area-averaged over the 30-degree latitudinal belts of the globe, 1881-2004. In: Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, TN, http://cdiac.esd.ornl.gov/trends/temp/lugina/lugina.html

Land surface air temperature anomalies relative to 1961-1990: NOAA NCDC (Smith et al. 2008, grey) Smith, T.M., R.W. Reynolds, Thomas C. Peterson, and Jay Lawrimore 2008: Improvements to NOAA's Historical Merged Land-Ocean Surface Temperature Analysis (1880-2006). Journal of Climate, 21, 2283-2293. http://www.esrl.noaa.gov/psd/data/gridded/data.noaa.ersst.html http://www.ncdc.noaa.gov/oa/climate/research/anomalies/index.html NOAA_ERSST_V3 data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/
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Note: For each dataset, one value is plotted for each year in the period of record. For datasets with multiple values in one year, an average is calculated for one annual value. Missing annual values are interpolated between non-missing values.
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