THE ROLE OF TROPICAL CONVECTION IN VARIATION OF INTRASEASONAL TELECONNECTIONS OF TROPICAL AND EXTRATROPICAL CIRCULATIONS

Based on ECMWF objective analysis data, the relationships between tropical convective activities and extratropical circulation, as well as the low frequency kinetic energy, have been investigated by making use of diagnostic analysis methods on the intraseasonal time scale in winters of 1983/1984 and 1986/1987. From this study, it is found that the different intensities of the tropical convective activities may bring about both the different intraseasonal teleconnection wave trains between the tropics and the extratropics and the different dispersions of the low frequency wave energy. Moreover, the tropical convection can be an important junction factor for the teleconnection effect of the tropical and extratropical circulations on the intraseasonal time scale.