Over the last few decades it has been a common practice to view the atmosphere from a zonally averaged perspective 在过去的几十年中，从纬向平均的角度来研究大气是通常的做法。
2.
Least fig . 3 be interpreted as the signature of zonally propagating waves , it is worth recalling what is said in the preceding chapter 为了使图3不被解释成纬向传播的波的特征，有必要回顾一下前一章所论述的。
3.
A more reasonable sao index is therefore defined as the sao variance percentage of the difference of the zonally averaged slp between 40 s and 65 s 据此，提出用40 s和65 s纬圈平均海平面气压差的半年周期分量的方差贡献作为准半年振荡的强度，该定义较前人的定义更为合理。
