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Fig. 4: Composite Reflectivity from CTRL, DWR1, DWR2 and DWR3
experiments at 850 hPa at 0900 UTC.
produces MSW of the order of 50 kts. Slight change in MSW is seen with the
assimilation of radar reflectivity data in DWR1 experiment. Simulated MSW
is of the order of 60 kts when the radar wind data are assimilated in DWR2
experiment. When both radar reflectivity and wind data are assimilated, the
experiment DWR3 produces MSW of the order of 60 kts. Hence simulated
maximum surface wind (~60 kts) in DWR2 and DWR3 experiments is very
close to the observed value of MSW.
In Fig. 6, the divergence fields from CTRL and DWR2 over the cyclone
vortex area at both the 850 and 200 hPa pressure levels are compared to study
the impact of wind data assimilation. It shows that the assimilation of wind
data has resulted in increase of upper-level divergence and lower-level
convergence (negative divergence) in the storm vortex. Wind spirals out at
200 hPa and spirals into at the 850 hPa are significantly improved in the storm
vortex. As a consequence, cyclone intensity has been improved by data
assimilation of wind data.
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