Studies on the Impacts of 3D-VAR Assimilation of Satellite Observations on the Simulation of Monsoon Depressions over India - Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications - page 652

a b

c d

e f

g h

Fig. 26.7 Spatial distribution of 24-h accumulated precipitation for CTRL ( a , b ), ATOVS ( c , d ),
SSM/I ( e , f ) and MODIS ( g , h ) for 19-22 September 2006 depression

Hence it is important to investigate carefully the skill of the model in simulating
the intensity and spatial distribution of the rainfall associated with the monsoon
depression. Figure 26.7 shows the spatial distribution of 24-h accumulated precipi-
tation simulated by the four numerical experiments on day-one and day-two of the
forecast for the 19-22 September 2006 depression. These are then compared with
the TRMM satellite observations for validation which are depicted in Fig. 26.3 i, j
respectively. It can be readily seen that the simulated precipitation by the CTRL, the
SSM/I and the MODIS experiments are over predicting the intensity of the rainfall
when compared to the TRMM observations. The ATOVS experiment simulates less