Based on NCEP/NCAR Reanalysis data and CMA tropical cyclone Yearbook information(1949 2013),rapid intensification of typhoons over coastal water of China are statistical analyzed.The statistical results suggest that the rapid intensification of coastal typhoons are small probability events which with 10.07% for rapid intensification.It also has distinct temporal and spatial characteristics.Composite data analysis and dynamic diagnosis are employed to reveal the circulation characteristics of the phenomena.The results of height field analysis show that the rapid intensification of typhoon is related with the subtropical high situated to the north of it.In the temperature field,there are always warm ridges encompassing the typhoons during their rapid intensification.In terms of water vapor transportation,the moisture supply to the typhoon of rapid intensification is abundant.As to the sea temperature field,the rapid intensification occurs over warm sea surface temperature(SST) region.At the same time,the low VWS will make a contribution to rapid intensification of tropical cyclones.Statistics showed that high SST configuration,low vertical wind shear and typhoon strength spurt,71.4% of the total accounted for all the rapid intensification in typhoons.But when high SST configuration,high vertical wind shear and low SST,middle vertical wind shear configuration,these two typhoons still appear rapid intensification,accounted for 2.9% of all rapid intensification in total number of typhoons over coastal water of China.
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