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本文拟从赤道波导作用这一侧面探讨E1 Ni(?)o(厄尔尼诺)事件发生的机制。通过求解运动方程,得到赤道Kelvin(开尔文)波动解。假定运动过程绝热,如考虑平流输送作用,可给出亦道Kelvin波引起E1 Ni(?)o事件发生前期亦道中、东太平洋SST的局地变化和海洋上层热含量变化的定性解析表达式。表达式表明SST异常及上层热含量的变化均随赤道Kelvin波向东传播。利用赤道Kelvin波还可解释1982—1983年E1 Ni(?)o事件前期风场异常的作用,前期(?)(SST)/(?)t为正时SST异常的时,空分布以及(?)(SST)/(?)t为正时SST异常之所以自西向东传播的原因。因此,有理由认为亦道Kelvin波可能是激发更E1 Ni(?)o事件发生的一种机制。
This paper intends to explore the mechanism of E1 Ni (o) o (El Niño) event from the side of the equatorial waveguide. By solving the equations of motion, the equatorial Kelvin wave solutions are obtained. Assuming the adiabatic process of motion, considering the effects of advection, the qualitative analytical expression of the local variation of SST and the change of the upper ocean heat content in the middle and middle of the middle and upper East China Sea due to the Kelvin wave of E1 Ni (?) O event can also be given. The expressions show that the anomaly of SST and the change of the upper heat content propagate eastward along the equatorial Kelvin waves. The use of equatorial Kelvin waves can also explain the role of wind field anomaly in the early E1 Ni (?) O events of 1982-1983. The previous SST / t t is the positive SST anomalies, ) (SST) / (?) T is the reason why the positive SST anomalies propagate from west to east. Therefore, it is reasonable to assume that the Kelvin wave may also be a mechanism that triggers the occurrence of more E1 Ni (o) o events.