Analysis of Asymmetric Characteristics on the Sub-synoptic Scale Systems of Typhoon Matasa(0509)

Two phenomena in typhoon Matasa were observed and analyzed in this paper:①the typhoon was with clear asymmetric characteristics.With moving northward of typhoon,the sub-synoptic scale systems moved from southwest to northeast quardrant of the typhoon,which was closely related to the warm current of Kuroshio.②Consistent with the change of tropopause height,the cloud top core of brightness shrank when the typhoon moved to the north.The simulation of Matasa by using the mesoscale model WRF showed that the warm and moist air in the south and east of the typhoon entered into the center of typhoon cyclonically,and provided the necessary thermodynamical condition to the development and maintaining of the typhoon.The strong vorticity and divergence in the east of the typhoon moved around the center of typhoon cyclonically,and provided the necessary dynamical condition to the development and maintaining of the typhoon.