Based on the prerequisite of system resonance, this thesis obtains the sufficient condition of system stability using quasi-linear theory and brings forward the criterions of the system stability.
Results show that the quasi biennial (QB) oscillation is the most unstable mode of the linear coupled air sea system and only the QB mode displays ENSO-like horizontal structure.
结果表明：准两年振荡是线性海气耦合系统中的最不稳定模态，且只有该模态类似于ENSO水平结构。
3
The quasi-static input-output linear regression equation of the measuring system is established, and the testing results of input-output curve linearity and sluggishness are given.