发展与不发展南海扰动的能量收支与转换特征

利用多年逐月海温距平和区风应力距平观测资料，运用线性回归和ＥＯＦ分析方法，分析了ＥＮＳＯ相联系的热带太平洋典型风应力异常场结构。结果显示，与ＥＮＳＯ线性相关的风应力异常场在时间尺度上表现为低频变化，在水平结构上主要表现为四个典型分布。

THE DEVELOPED AND UNDEVELOPED TROPICAL DISTURBANCE IN SOUTH CHINA SEA SUMMER

By selecting the developed and undeveloped tropical disturbances in South China Sea summer,we calculated the kinetic energy budget and conversion for the life cycle of disturbances.The results showed that sub grid scale cumulus convection plays an important role in the life cycle of developed disturbance.Apart from the contribution by cumulus convection,the horizontal flux item also has significant contribution to the development of disturbance in the initial stage.By investigating conversion function C(K_χ,K_Ψ),we examined the conversion feature between divergent wind and non divergent wind kinetic energy.It is found that C(K _χ,K_Ψ)increased with the development of disturbance,the principal contribution is C1=f_χ·_Ψ for the C(K_χ,K_Ψ).In lower troposphere,conversion from K_χ to K _Ψ,in upper troposphere,conversion from K _Ψ to K_χ.By investigating the conversion function C(P,K_χ),we examined the conversion feature between potential energy P and divergent wind kinetic energy.It is also found that C(P,K_χ) increased with the development of disturbance.The significant conversion occurred at upper troposphere.