Abstract
The following recent research results of the Mei-Yu phenomenon in southeastern China are reviewed in this paper. 1) Case studies of a Mei-Yu frontal system during June 10-15, 1975. This system was studied in detail for its rainfall characteristics, kinematic and dynaniical structures, budgets of vorticity, moisture, and kinetic energy, and the accompanying mesoscale systems. The results suggested the dynamical processes for maintaining a Mei-Yu trough and the role of a low level southwesterly jet in the formation of mesoscale cb clusters. 2) Composite studies of 8 cases of Mei-Yu frontal systems during the more active years of 1975 and 1977. The structure variation in different stages and different segments of the Mei-Yu trough observed in the individual cases was substantiated. 3) The climatology of Mei-Yu front and its associated frontogenesis and low level jet over southern China and Taiwan for 1968-77. 4) Numerical simulation of the Mei-Yu frontal system. One of the more interesting conclusions in the model simulations is the formation of a low level jet to the south of the Mei-Yu front due to a secondary circulation induced by the convective latent heat release.
