Analysis Of Remote Tropical Cyclone Precipitation Events In Summer From2000to2009and Simulation

Tropical Cyclones (TCs) are among the most destructive of natural disasters which usually bring serious damages to human beings. TC is the most severe heavy Rainfall system in China, one of the heavy Rainfall phenomenoa is called Tropical Cyclone Remote Precipitation due to the remote distant between it and TC.The forcast of Remote heavy Rainfall is still a challenge to weather forcaster at present, because its complicated formation mechanism.In this paper, considering the fators of moisture channel and interaction between TC and midlatitude systems, a statistical analysis of Tropical Remote Precipitation (TRP) events was performed by using of the National Centers for Environmental Prediction (NCEP) global final (FNL) analysis、TRMM3B42V63-hourly merged rainfall dataset、Japan Meteorological Agency best track in Jun, July and August from2000to2009.48TRPs occured during this period and were divided into5categories, each type of them was investigated by the means of composite analysis. Results show that TCs, midlatitude trough,subtropical high and the moisture channel are the main factors which affect Tropical Cyclone Remote Precipitation events at850hPa and500hPa, the impact of moisture channel is most remarkable because of the connection between it and Indian monsoon. The third type called Northern trough or eddy-southern TC occures frequently which accounts for68.8%of total numbers, in addition, most of the TRPs occure on the right side of TC’s track. At200hPa, most of the Tropical Remote Precipitation events occur at the right rear portion of an upper-tropospheric jet axis, meanwhile at the East and the West of TC there is an anticyclone on each side.But when Tropical Remote Precipitation event occurs at the North-West of TC, TC is strong especially there is a trough.The meso-scale WRF/ARW model was used to investigate the possible remote effectes of TC "HAIMA"(2011) on the heavy rainfall event over Japan and its adjacent seas, two numerical experiments are performed.In the no-TC experiment, the vortex associated with TC HAIMA in the FNL analysis was removed by a simple BOGUS scheme such that the typhoon signal did not appear at the initial time.The no-TC experiment results show that the remote heavy rainfall in Japan was largely suppressed, indicating HAIMA was the key factor of this event and affeced the heavy rain through transporting moisture into precipitation region. In no-terrain experiment, the terrain height over the main research region was set to0if it is higher than Om so that the orographic lifting effects on precipitation would be eliminated.The experiment result shows that orographic lifting of warm, mosit air played a small role in this precipitation event.