The rain-shadow effect for the Ethiopian Highlands

Abstract

<p>Recent work highlight the ambiguities in the definition and difficulties in quantification of the rain shadow effect. According to this phenomenon  there is a reduced rainfall on the leeward side of the mountains as compared to the windward side. We present a statistical approach to study this effect in case climatological time series of model data are available in geographically complex regions. Our approach requires only gridded rainfall, wind and  model elevation. We disentangle the aspects that contribute to the rainfall enhancement at the windward side. We apply the approach on the summer mountain precipitation (kerimt) over the Ethiopian Highlands based a new 21-year long climate run with the regional climate model ALARO-0 at a resolution of 4 km. There is an overall increased rainfall of 20% for windward events as compared to leeward events, but locally this can exceed 150%. This increase can be attributed to the positive differences between windward and leeward events in their frequency of occurrence, and, in the rainfall quantity during rainfall events. Differences in rainfall frequency, on the other hand, are spatially inhomogeneous and smaller than the spatial variations of the rainfall frequencies themselves.</p>

Local climate variability associated to sustainable agriculture at rain shadow areas of mount Rinjani and Tambora in West Nusa Tanggara

“…Evapotranspiration ETo (Figure 6) expresses potential loss of water from surface due to evaporation and transpiration with a standard unit in mm per day or as equivalent to unit solar energy of 2.45 MJ m -2 day -1 or 1 mm day -1 equal to 2.45 MJ m -2 day -1 [22]. As it is shown on Figure 6 that pattern of ETo followed the pattern of air temperature, which was relatively high in low land, and gradually decreased at medium and high land.…”