Study of Weak Intensity Cyclones over Bay of Bengal Using WRF Model

P. S.  Salvekar; Radhika D.  Kanase

doi:10.4236/acs.2014.44049

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ACS Vol.4 No.4 , October 2014

Study of Weak Intensity Cyclones over Bay of Bengal Using WRF Model

Radhika D. Kanase, P. S. Salvekar

Abstract: Numerical simulations of four weak cyclonic storms [two cases of pre-monsoon cyclones: Laila (2010), Aila (2009) and two cases of post-monsoon cyclones: Jal (2010), SCS (2003)] are carried out using WRF-ARW mesoscale model. Betts-Miller-Janjic (BMJ) as cumulus parameterization (CP) scheme, Yonsei University(YSU) planetary boundary layer (PBL) scheme and WRF single moment 6 class (WSM6) microphysics (MP) scheme is kept same for all the cyclone cases. Three two-way interactive nested domains [60 km,20 kmand6.6 km] are used with initial and boundary conditions from NCEP Final Analysis data. The model integration is performed to evaluate the track, landfall time and position as well as intensity in terms of Central Sea Level Pressure (CSLP) and Maximum Surface Wind speed (MSW) of the storm. The track and landfall (time and position) of almost all cyclones are well predicted by the model (except for SCS cyclone case) which may be because of the accurate presentation of the steering flow by CP scheme. Irrespective of season, the intensity is overestimated in all the cases of cyclone, mainly because of the lower tropospheric and mid-tropospheric parameters are overestimated. YSU PBL scheme used here is responsible for the deep convection in and above PBL. Concentration of frozen hydrometeors at the mid-tropospheric levels and thus the latent heat released during auto conversion of hydrometeors is also responsible for overestimation of intensity.

Keywords: WRF-ARW Model, BMJ-YSU-WSM6 Combination, Pre and Post Monsoon Severe Cyclonic Storms

Cite this paper: Kanase, R. and Salvekar, P. (2014) Study of Weak Intensity Cyclones over Bay of Bengal Using WRF Model. Atmospheric and Climate Sciences, 4, 534-548. doi: 10.4236/acs.2014.44049.

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