摘要
利用β平面上大气斜压强迫模式,探讨了局地海表温度异常所造成的非绝热加热影响的赤道小振幅“拦截波”的稳定性。指出当加热函数是半余弦形式时,在加热区大气的反应是局地性的,但这个加热函数的小扰动能产生非局地性的大尺度反应。平均海表温度降低了赤道波动的稳定性。当稍超过临界值时,小尺度海表温度异常有可能使波动不稳定。
The model of baroclinic forced atmosphere on a beta-plane is used to study the stability of trapped small amplitude equatorial waves subject to the dubatic heating connected with the effect of localized sea surface temperature (SST ) anomalies. When heating is described with a half-cosine function, the reaction of the atmosphere is mostly locahied in a heating domain, but small disturbances of this function may give rise to a nonlocal large scale response. A mean SST decreases the stability of the equatorial waves, and, when slightly subcritical, makes it possible for small scale SST anomalies to destabilize the waves.
关键词
海表
温度
赤道波动
稳定性
大气
SST anomaly
stability of equatorial waves, ENSO
two-layer model
local condensational heating
