Abstract
The circulation and zonal wind anomalies in the lower troposphere over the equatorial western Pacific and their roles in the developing and decaying processes of the 1982–1983, 1986 –1987, 1991–1992 and 1997–1998 El Niño events and the occurrence of La Niña events are analyzed by using the observed data in this paper. The results show that before the developing stage of these El Niño events, there were cyclonic circulation anomalies in the lower troposphere over the tropical western Pacific, and the anomalies brought the westerly anomalies over the Indonesia and the tropical western Pacific. However, when the El Niño events developed to their mature phase, there were anticyclonic circulation anomalies in the lower troposphere over the tropical western Pacific, and the anomalies made the easterly anomalies appear over the tropical western Pacific. A simple, dynamical model of tropical ocean is used to calculate the response of the equatorial oceanic waves to the observed anomalies of wind stress near the sea surface of the equatorial Pacific during the 1997/98 ENSO cycle, which was the strongest one in the 20th century. It is shown that the zonal wind stress anomalies have an important dynamical effect on the devel-opment and decay of this El Niño event and the occurrence of the following La Niña event.
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References
Bjerknes, J. A., Possible response ofthe atmospheric Hadley circulation to equatorial anomalies of ocean temperature, Tellus, 1966, 18: 820–829.
McCreary, J. P., Amodel of tropical ocean-atmosphere interaction, Mon. Wea. Rev., 1983, 111: 370–387.
McCreary, J. P., Anderson, D. L. T., A simple model of El Niño and the Southern Oscillation, Mon. Wea. Rev., 1984, 112: 934–946.
Anderson, D. L. T., McCreay, J. P., Slowly propagating disturbances in a coupled ocean-atmosphere model, J. Atmos. Sci., 1985, 42: 615–628.
Schopf, P. S., Suarez, M. J., Vacillations in a coupled ocean-atmosphere model, J. Atmos. Sci., 1988, 45: 549–566.
Philander, S. G. H., The response of equatorial ocean to a relaxation of trade winds, J. Phys. Oceanogr., 1981, 11: 176–189.
Tang, T. Y., Weisberg, R. H., On the equatorial Pacific response to the 1982-83 El Niño and Southern Oscillation event, J. Mar. Res., 1984, 42: 809–829.
Huang Ronghui, Zhang Renhe, Diagnostic study on the interaction process between ENSO cycle and East Asian monsoon circulation, in Memorial Papers to Jaw Jeoujang (ed. Ye Duzheng), Beijing: Science Press, 1997, 93–109.
Zhang Renhe, Huang Ronghui, Dynamical effect of zonal wind stresses over the tropical Pacific on the occurring and vanishing of El Niño event, Part I, Diagnostics and theoretical analyses, Chinese J. Atmos. Sci., 1998, 22: 587–599.
Ren, B. H., Huang, R. H., Interannual variability ofthe convective activities associated with the East Asian summer monsoon seen from TBB variability, Adv. Atmos. Sci., 1999, 15: 77–90.
Gill, A. E., Some simple solutions for heat-induced tropical circulation, Q. J. R. Meteor. Soc., 1980, 106: 447–462.
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Huang, R., Zhang, R. & Yan, B. Dynamical effect of the zonal wind anomalies over the tropical western Pacific on ENSO cycles. Sci. China Ser. D-Earth Sci. 44, 1089–1098 (2001). https://doi.org/10.1007/BF02906865
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DOI: https://doi.org/10.1007/BF02906865