Primary Study on the Anomaly of Tropical Circulations and the Mechanism of El Nio Development in the Summer of 1982
Huang Zhen Tao Shiyan(Institute of Atmospheric Physics, Chinese Academy of Sciences, Beying, 100029)
The relationship between the anomaly of tropical circulation and development of 1982 -1983 El Nino event was studied through the analysis on interannual variations of tropical circulations during 1980- 1983 summer with ECMRWF data. The abnormally strong east jet in the upper troposphere in East-Asia in the summer of 1982 is a possible mechanism which results in the great development of the 1982- 1983 El Nino event after July of 1982. The thermal contrast between Australia and the eastern Pacific due to the abnormal activities of the cold air in Australia is an important reason why the trade wind over Equatorial Pacific is weakened largely.