Important progresses of the study of the general circulation and monsoons in East Asia,which have been made since the pioneering work“Monsoons in Southeast Asia and rainfall amount in China”by Prof.Zhu Kezhen,are ex...Important progresses of the study of the general circulation and monsoons in East Asia,which have been made since the pioneering work“Monsoons in Southeast Asia and rainfall amount in China”by Prof.Zhu Kezhen,are extensively reviewed in memory of this founder of modern meteorology in China.The first part has addressed the bimodality of the general circulation and the abrupt seasonal change.The second part has dealt with the role of the continent-ocean contrast and topography in the dynamic and thermal processes of mon- soon development,including winter and summer monsoons,and associated heat sources and sinks.The third part has discussed the monsoonal precipitation,with a special emphasis on the mesoscale disturbance,low-level jet and interannual variability of Meiyu(plum rains).展开更多
In correspondence with the establishment of the“upper high and lower high”pressure pattern due to the activities of 500 hPa high over the Tibetan Plateau in summer,a series of changes of the East Asia atmospheric ci...In correspondence with the establishment of the“upper high and lower high”pressure pattern due to the activities of 500 hPa high over the Tibetan Plateau in summer,a series of changes of the East Asia atmospheric circulation will take place.In this paper,the distributions of divergence and vertical velocity of 500 hPa high,the evolutions of atmos- pheric heat source,the variations of vorticity and zonal wind at 100 hPa level and vertical meridional cell over the Tibetan Plateau etc.are statistically analyzed.Thus,we can see that the ascending motion and the convective heating over the Tibetan Plateau,the South Asia high and the westerly jet on the north of the Plateau at 100 hPa level are weak- ened.The northern branch and the southern branch of the easterly jet on the south of the Plateau merge into a single whole and situate on the south of the former northern branch.In the meantime,thermodynamic land-sea discrepancy in South Asia and the convective heating over the Bay of Bengal is enhanced.It will play an important role in the mainte- nance of the easterly jet and the South Asia monsoon.展开更多
文摘Important progresses of the study of the general circulation and monsoons in East Asia,which have been made since the pioneering work“Monsoons in Southeast Asia and rainfall amount in China”by Prof.Zhu Kezhen,are extensively reviewed in memory of this founder of modern meteorology in China.The first part has addressed the bimodality of the general circulation and the abrupt seasonal change.The second part has dealt with the role of the continent-ocean contrast and topography in the dynamic and thermal processes of mon- soon development,including winter and summer monsoons,and associated heat sources and sinks.The third part has discussed the monsoonal precipitation,with a special emphasis on the mesoscale disturbance,low-level jet and interannual variability of Meiyu(plum rains).
基金This study is partially supported by the National Natural Science Foundation of China.
文摘In correspondence with the establishment of the“upper high and lower high”pressure pattern due to the activities of 500 hPa high over the Tibetan Plateau in summer,a series of changes of the East Asia atmospheric circulation will take place.In this paper,the distributions of divergence and vertical velocity of 500 hPa high,the evolutions of atmos- pheric heat source,the variations of vorticity and zonal wind at 100 hPa level and vertical meridional cell over the Tibetan Plateau etc.are statistically analyzed.Thus,we can see that the ascending motion and the convective heating over the Tibetan Plateau,the South Asia high and the westerly jet on the north of the Plateau at 100 hPa level are weak- ened.The northern branch and the southern branch of the easterly jet on the south of the Plateau merge into a single whole and situate on the south of the former northern branch.In the meantime,thermodynamic land-sea discrepancy in South Asia and the convective heating over the Bay of Bengal is enhanced.It will play an important role in the mainte- nance of the easterly jet and the South Asia monsoon.
