Impact of horizontal resolution on prediction of tropical cyclones over Bay of Bengal using a regional weather prediction model |
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| Authors: | M Mandal U C Mohanty K V J Potty A Sarkar |
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| Institution: | (1) Centre for Atmospheric Sciences, Indian Institute of Technology, Hauz Khas, 110 016 New Delhi, India;(2) Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany;(3) Modi College of Engineering and Technology, Lakshmangarh, Sikar, India |
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| Abstract: | The present study is carried out to examine the performance of a regional atmospheric model in forecasting tropical cyclones
over the Bay of Bengal and its sensitivity to horizontal resolution. Two cyclones, which formed over the Bay of Bengal during
the years 1995 and 1997, are simulated using a regional weather prediction model with two horizontal resolutions of 165 km
and 55 km. The model is found to perform reasonably well towards simulation of the storms. The structure, intensity and track
of the cyclones are found to be better simulated by finer resolution of the model as compared to the coarse resolution. Rainfall
amount and its distribution are also found to be sensitive to the model horizontal resolution. Other important fields, viz.,
vertical velocity, horizontal divergence and horizontal moisture flux are also found to be sensitive to model horizontal resolution
and are better simulated by the model with finer horizontal grids. |
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| Keywords: | Tropical cyclone resolution track regional model |
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