Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 10.11: Examples of seasonal precipitation anomalies simulated with RCMs driven by analyses of observations over different regions. In all cases the anomalies are calculated as the difference between the precipitation of an individual season and the average for the seasonal value for the entire simulation. (a) (top) Northwestern USA (NW), and (bottom) Upper Mississippi Basin (UMB) for a three year simulation (1993 to 1996) over the continental USA. The three pairs of observed (hollow bars) and simulated (solid bars) anomalies for each season are grouped in sequential order from 1993 to 1996. Units are percentage of the three-year seasonal average (from Giorgi and Shields, 1999, Figure 9). (b) Precipitation anomalies for twelve short-rains periods over Tanzania for the October-December season: (top) model simulation, and (bottom) observations. Units are mm. (From Sun et al., 1999).

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