Following Wu and Chen(1989), in terms of the elliptical differential equation with mean meridional stream function, an equation similar in form to that developed by Kuo (1956) and by use of time average statistics of ...Following Wu and Chen(1989), in terms of the elliptical differential equation with mean meridional stream function, an equation similar in form to that developed by Kuo (1956) and by use of time average statistics of atmospheric circulation in wavenumber domains at the same intervals of time, a study is made of the con- tribution of the internal forcing of the atmosphere in two space scales to mean meridional circulation. Re- sults show that planetary waves have considerable influence on the intensity of the upper center of the bi- Hadley cell, and, in contrast, synoptic-scale waves exert vital effect on the Ferrel cell, and that in the Northern Hamisphere(NH)such internal forcings by planetary- and synoptic-scale waves are comparable on mean merid- ional circulations whereas the latter contribute far more than the former in the Southern Hemisphere (SH). Further, in the northern winter (summer)the contribution of heat (angular momentum) transport of planetary waves allows the descending (ascending) branch to occur as far as around 40°N, some kind of effect that makes quite important contribution to the winter (summer) monsoon circulation in eastern Asia.展开更多
基金The study is supported partially by National Natural Science Foundation of Chinapartially by the State Meteorological Administration Monsoon Research Funds.
文摘Following Wu and Chen(1989), in terms of the elliptical differential equation with mean meridional stream function, an equation similar in form to that developed by Kuo (1956) and by use of time average statistics of atmospheric circulation in wavenumber domains at the same intervals of time, a study is made of the con- tribution of the internal forcing of the atmosphere in two space scales to mean meridional circulation. Re- sults show that planetary waves have considerable influence on the intensity of the upper center of the bi- Hadley cell, and, in contrast, synoptic-scale waves exert vital effect on the Ferrel cell, and that in the Northern Hamisphere(NH)such internal forcings by planetary- and synoptic-scale waves are comparable on mean merid- ional circulations whereas the latter contribute far more than the former in the Southern Hemisphere (SH). Further, in the northern winter (summer)the contribution of heat (angular momentum) transport of planetary waves allows the descending (ascending) branch to occur as far as around 40°N, some kind of effect that makes quite important contribution to the winter (summer) monsoon circulation in eastern Asia.
