Analysis of the kinematic and thermodynamic structure in the tropical cyclone boundary layer with the dropsonde data
The environmental characteristics and structure of boundary layer from 46 hurricanes over the Atlantic and 11 typhoons over the Northwest Pacific was analyzed by using data of 5218 dropsondes in the Atlantic and 448 dropsondes in the Northwest Pacific,global sea surface temperature,best track and statistical intensity prediction scheme data.Furthermore,the structure of boundary layer from rapid intensifying hurricanes was further investigated.Firstly,the direction of vertical wind shear of intensifying tropical cyclones is further north.Compared to weakening group,the environmental conditions around intensifying tropical cyclones are moister and warmer.Relative humidity and ocean heat content of Northwest Pacific typhoons are larger than those of Atlantic hurricanes.Secondly,the radial distributions of variables show that tropical cyclones in the intensifying group generally have warmer boundary layer and relatively lower specific humidity.Thirdly,rapid intensifying hurricanes preferentially occurs in northerly vertical wind shear environments.Moreover,rapid intensifying hurricanes have moister environment,more symmetric temperature distribution and lower specific humidity than those of rapid weakening hurricanes.These findings provide valuable insights for tropical cyclone intensity prediction,particularly for the prediction of rapid intensifying or weakening.
NETL
NSTL
万方数据
