Figure 2.36: Changes in
the maximum annual 5-day precipitation total (a, b) and in the proportion of annual
precipitation occurring on days on which the 95th percentile of daily precipitation,
defined over the period 1961 to 1990, was exceeded (c, d). The analysis shown
is from Frich et al. (2001). Panels (a) and (c) show percentage changes in these
quantities between the first and last half of the period, approximately 1946 to
1999. In both panels, the red circles indicate negative changes and the blue circles
indicate positive changes. The size of each circle reflects the size of the change
and solid circles represent statistically significant changes. Panels (b) and
(d) show the average annual values of the quantities expressed as percentage differences
from their 1961 to 1990 average values. The trend shown in panel (b) is statistically
significant at the 5% level.
