Activities of quasi-stationary waves in the tropical atmosphere and EI Ni■o/Southern Oscillation

【摘要】 <正> Using the data from European Center for Medium Range Weather Forecast (ECMWF), the closerelationship between the activities of quasi-stationary waves (the period>90d) in the tropical atmosphere and ElNino/ Southern Oscillation (ENSO) is exposed. The systematic eastward propagation of quasi-stationary waves is asso-ciated with El Nino event, but the westward progagation of quasi-stationary waves is unfavourable to the occurrence ofEl Nino or corresponding to La Nina. It is also shown that the equatorial westerly anomalies caused by the systematiceastward propagation of quasi-stationary waves should be an important mechanism to excite El Nino.更多还原

【Abstract】 Using the data from European Center for Medium Range Weather Forecast (ECMWF), the closerelationship between the activities of quasi-stationary waves (the period>90d) in the tropical atmosphere and ElNino/ Southern Oscillation (ENSO) is exposed. The systematic eastward propagation of quasi-stationary waves is asso-ciated with El Nino event, but the westward progagation of quasi-stationary waves is unfavourable to the occurrence ofEl Nino or corresponding to La Nina. It is also shown that the equatorial westerly anomalies caused by the systematiceastward propagation of quasi-stationary waves should be an important mechanism to excite El Nino.更多还原