The Influence of Topography on East African October to December Climate: Sensitivity Experiments with RegCM4

Figure 4

Climatology of OND rainfall (in mm) over the period 2000–2008: (a) GPCP observed rainfall, (b) CRU observed rainfall, (c) simulated using actual topography (TP100), (d) simulated using topography reduced to 25% (TP25) over 34°E–38°E and 6°S–2°N, (e) actual topography (TP100), (f) topography over KTU reduced to 25% (TP25), and (g) rainfall difference [(d) minus (c)] with contours (green) at 25 mm interval and the thick (black) contours represent regions over which the rainfall difference is zero. The shaded regions in (g) are significant at 95% confidence level (where shaded blue (orange) implies decrease (increase) in rainfall).

(a) GPCP PRE

(b) CRU PRE

(c) PRE TP100

(d) PRE TP25

(e) TP100

(f) TP25

(g) PRE TP25-TP100