Workshop on Heavy Rainfall Research in East Asia and Planning of Huanan and Taiwan Area Mesoscale Experiment

9-11 December 1996
Central Weather Bureau, Taipei, Taiwan, Republic of China

by Yu-Chieng Liou
Department of Atmospheric Sciences, National Central University
Taiwan, Republic of China

This workshop is actually a preparation meeting for a joint experiment participated by scientists mainly from Taiwan, China and USA, which will take place in 1998. Its name is "HUAMEX", which stands for "Huanan and Taiwan Area Mesoscale Experiment". Huanan means the southern part of mainland China, mainly south of the Yang-Tze river.

Main purpose:

  1. To better understand the physical mechanisms behind the cause, evolution and dissipation of convection systems which often trigger the heavy precipitation in the Huanan area.
  2. To better understand the influence from the terrain, boundary layer processes on the heavy rain system.
  3. To develop a new generation of mesoscale numerical model and improve the initialization and the physical processes. In the long run, this model should be able to serve as an operational model.
  4. To explore the interactions between the mesoscale convection systems with the motions of other scales.
  5. To make suggestions for improving the local weather prediction service, in terms of observations, analysis and forecast technology.

Main scientific problems:

  1. The cause of Mei-Yu (Plum rain) front, and its structure.
  2. The dynamics of the cross-front non-hydrostatic circulation
  3. The role of the southwestern monsoon on the development of the front.
  4. The characteristics of the mesoscale perturbation along the frontal zone.
  5. The dynamics of the low level jets, and the structure of the accompanied secondary circulation.
  6. The mechanism that cause the low level jet.
  7. The interaction between low level jet and mesoscale circulation system.
  8. The relation between low level jet and heavy precipitation.
  9. The characteristics of the mesoscale convection movement and its precipitation structure.
  10. The interaction between the mesoscale system with the environment.
  11. The dynamics of squall lines.
  12. The influence of boundary layer and local circulation to the mesoscale system.
  13. Terrain effect on the precipation and air flow.
  14. The structure of the microphysics in a mesoscale convection system.
  15. The radiation-cloud interaction.

Prof. Yu-Chieng Liou
Department of Atmospheric Sciences, National Central University
Chung-Li, Taiwan 32504, Republic of China