Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 2.10: (a) to (d) Seasonal surface temperature trends for the period 1976 to 2000 (°C/decade), calculated from combined land-surface air and sea surface temperatures adapted from Jones et al. (2001). The red, blue and green circles indicate areas with positive trends, negative trends and little or no trend respectively. The size of each circle reflects the size of the trend that it represents. Trends were calculated from seasonally averaged gridded anomalies with the requirement that the calculation of seasonal anomalies should include all three months. Trends were calculated only for those grid boxes containing seasonal anomalies in at least 16 of the 24 years.

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