One is the change of the basic - state parameters ( e . g . , the zonal wind field ) ; the other is existence , in the real atmosphere , of instabilities not described in our model , like for instance , baroclinic instability 一個(gè)是基態(tài)參數(shù)(例如緯向風(fēng)場(chǎng))的變化;另一個(gè)在實(shí)際大氣存在的不穩(wěn)定(此模式未予涉及) ,例如斜壓不穩(wěn)定。