Abstract
An attempt has been made to examine whether the stability condition of the layer, above the upper boundary of a computational domain, has any effect on the magnitude and spatial pattern of rainfall intensity (RFI), as diagnosed by dynamical model of orographic rainfall. For this purpose a three dimensional mesoscale dynamical model for orographic rainfall has been used. In this model the vertical computational domain has been capped by layer (here after called top layer) with a constant background wind and stability. With this slight modification the model is being run with different values of stability of the top layer for a given vertical profile of wind and temperature at a station, far upstream of the orographic barrier. Preliminary results show that given the profile of a 3-D meso scale mountain, the vertical profile of basic flow across it, the magnitude and spatial distribution (1-D and 2-D) of computed orographic rainfall intensity hardly have any bearing with top layer stability. Interestingly, in some cases it has been found that the effect of imposition of a top layer is to reduce the magnitude of peak computed RFI just behind the barrier and thus underestimation of RFI.
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