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.
