Remote Effects of Typhoon Vicente (2012) on a Torrential Rain over Beijing on 21 July 2012

A torrential rain event hit Beijing on 21 July 2012, with a maximum rainfall excess of 460 mm in 24 hours, being the most serious precipitation event in Beijing in past 61 years. It was also a typical remote rainfall related to Typhoon Vicente. Numerical sensitivity experiments were performed to investigate the effects of Vicente on the heavy rainfall. Results indicate that the Typhoon affected the rain rate and distribution in distantly located area. For the strengthened (weakened) TC, the rain bands extended northward (southward) and increased (decreased). It is found that TCs in different intensities have different effects on West Pacific Subtropical high(WPSH)activity. In this case, strengthened westward TCs were beneficial for the WPSH to withdraw earlier and form into a block shape, while the WPSH would tend to stretch westerly and have a zonal form under weakened TCs. Besides, the moisture transport associated with TCs must be considered. The stronger TCs provided more moisture and unstable energy from the tropical ocean to feed the distantly Beijing area, which contributed to the development of local rainfall conditions such as vorticity, deep convection and so on. >