In July 1989 the first conference in this series took place in Hong Kong. It was run with the innovative bilingual approach, which allowed both Chinese- and English-speaking scientists from various regious of East Asia and across the Pacific to come together, and share and discuss their research. It also proved to be an invaluable networking opportunity leading to a rapid growth of interaction and cooperation among a diverse group of scientists in the decade that followed. The breadth and depth of the presentations at the Fourth Conference was a testimony to the coming of age of this series of conferences, marking the tenth anniversary of an endeavor that had a modest beginning.

Contents:

• Monsoon Observations:
• The Global Monsoon Systems (Q-C Zeng)
• The SCSMEX/GAME Sounding Networks and the Onset of the 1998 Asian Summer Monsoon (R H Johnson & P E Ciesielski)
• Relationship between the Planetary-scale Circulation over East Asia and the Intensity of the South Asian Summer Monsoon (J-J Xu & J C L Chan)
• Wind Changes over the Western Pacific (W T Liu et al.)
• Climate:
• Mechanism of ENSO-Monsoon Interaction During Mature-Decay Phases of ENSO Cycle (B Wang et al.)
• Impact of Land Surface Processes on Summer Climate (G-X Wu et al.)
• Impact of ENSO on the Variability of the Asian-Australian Monsoons (N-C Lau)
• Summary of COSMIC and Applications to Meteorology and Climate (R A Anthes & Y-H Kuo)
• Theoretical Studies:
• Tropical Tropospheric Biennial Oscillation and ENSO (C-P Chang & T Li)
• Typhoon:
• On the Formation of the Hurricane Eye (D-L Zhang et al.)
• Systematic Approach for Tropical Cyclone Track Forecasting with Dynamical Model Selective Consensus (R L Elsberry & L E Carr, III)
• Mesoscale Meteorology:
• Convection and Local Circulation under the Influence of Meiyu Front over Northern Taiwan (G T-J Chen)
• Air Pollution:
• Emission Inventory of Civil Aircrafts over Taiwan (P-S Lin et al.)
• and other papers