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。
2
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.
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.