Environmental Characteristics During the Rapid Intensification of Super Cyclonic Storm Chapala(2015)over the Arabian Sea
Based on the best-track data from the Joint Typhoon Warning Center,ERA5 0.25 °×0.25 ° reanalysis data,and NOAA 0.25 °×0.25 ° daily Optimum Interpolation Sea Surface Temperature data,a study was conducted to investigate the environmental characteristics during the rapid intensification of super cyclonic storm Chapala(2015)over the Arabian Sea.The results showed that the warm pool,which was 3.0-3.5℃ warmer than the annual average,provided water vapor and energy for the storm's rapid intensification.The establishment of the subtropical westerly jet on the north side of Chapala and the upper-level outflow channel on the south side were important upper-level forcing conditions for its rapid intensification.The enhancement of high-level divergent wind promoted the mass outflow to form a strong upward motion,accompanied by the rapid growth of rotational wind energy.There was a significant positive potential vorticity anomaly above 150 hPa during the rapid intensification of Chapala,bringing about the strengthening of cyclonic circulation at the lower level.At the same time,there was a significant positive potential vorticity advection inflow at 400 hPa.Thus,positive vorticity increased rapidly in the vertical direction.There was a warm core near 300 hPa,with the vertical convective motion in the inner core reaching the maximum.
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