first-order cycle

The variation of ozone density is of an obvious one year cyclic vibration, shown as the seasonal variation.

4×10~(18)cm~(-2);臭氧浓度有明显的一年周期震荡,表现为季节变化:平流层中上层臭氧浓度夏季高冬季低;平流层下层臭氧浓度夏季低冬季高。