Abstract:

Based on WRF model, the response of southwest vortex precipitation systems to the typhoon were studied at different numerical experimentation with modifying the typhoon dynamic winds by means of the southwest vortex heavy rain case affected by the longdistance typhoon.The results showed that the transportation of water vapor and the instability energy enhanced the role of the Swan typhoon,which resulted in the occurrence of heavy rainfall prolonged.The southwest vortex moving path had obvious differences and the precipitation had significant regional local differences with the effect of different typhoon dynamic winds.When the southwest vortex system center extended westward (eastward) and northward (southward),the lowlevel jet stream belt was westward (eastward),which led to moisture and instability energy transportation and spatial location of convergence zone being west (east) in the middle and low level correspondingly.The regional rainfall distribution was influenced and the local difference of precipitation area was obvious.The longdistance typhoon had a significant impact on the southwest vortex circulation system