The Analysis of the Asymmetric Precipitation Caused by the No.10 Tropical Cyclone “Damrey” in 2012 Based on Observation and Numerical Simulation

Abstract

The No.10 tropical cyclone “Damrey” in 2012 is the first landing typhoon on the north of the Yangtze River after 1949. After its landing, Damrey showed an obvious asymmetric structure and precipitation. Using the ERA-interim reanalysis data from the European Centre for Medium-Range Weather Forecasting (ECMWF), the study simulated the whole process of Damrey from pre-landing to extinct by using WRF model. Based on the model result and FY-2E satellite data and observation data, the study analysis the causes of the asymmetric structure of Damrey. It is found that the descending motion is strong on the west and south sides of the typhoon, they blocked the southwest water vapor transport. So the development of convective cloud system was hindered, and the wind shear on the west and south sides on the typhoon was stronger than on the east and north. It caused the result of the precipitation on the east and north sides of typhoon much more than on the west and south. Q-vector, upper level jets and other factors are also analyzed in this study.