热带太平洋上层热力和动力状况季节及年际变率分析

By using the upper layer data (from sea surface to 400m depth, download from the web of Scripps Institution of Oceanography), the seasonal cycle of heat storage in the tropical Pacific Ocean is investigated. It shows the different features from SST.'s. Two low value areas occur through the Pacific Ocean between 5oN-10oN, and there are two rather clear patterns - one is 'boreal winter pattern (November, December, January and February)', another is 'boreal summer pattern (May, June, July and August)'. The other months (March, April; September, October) are relatively short as the transition period. The seasonality on 2oN and 10oN vary out of phase, on the contrary, they vary in-phase on 2oN and 10oS. The variation in east Pacific Ocean is leading to the central Pacific Ocean, it shows clear propagating feature. The evolution of the seasonality presents out of phase between 10oN and 10oS..It is different from the traditional viewpoint that the west Pacific Ocean is not a uniform area with the deepest mixed layer. From December to the next March, the deeper mixed layer locates north to the 10oN and beside the equator between 160oE to 140oW. South to the 10oS, the mixed layer is shallower. This kind of distribution is defined as 'boreal winter pattern'. On the contrary, from July to September the shallowest mixed layer locates southern to the 5oS especially nearby the northeast Australia. This pattern is defined as 'boreal summer pattern'. The mixed layer is shallower over the east Pacific Ocean in all seasons as the traditional reference mentioned. The seasonality of the mixed layer depth is also defined as 'boreal winter pattern' and 'boreal summer pattern' respectively. .There is great difference between the seasonality patterns of heat storage and that of mixed layer depth. Because the mixed depth and its variability indicates the main characteristics of dynamical process in the upper layer of ocean, this difference predicates that seasonal variability of heat storage is not controlled by the dynamical process. The key processes maybe heat flux at air-sea interface. It needs further investigation. In interannual scale, the patterns of heat storage and mixed layer depth are very similar. This indicates that the variability of heat storage is strongly controlled by the dynamical process..Slow tropical disturbances in a simple air-sea coupled model are investigated in the local thermal equilibrium case. The results show that the coupled parameter KHKS and the scale parameter a restrict the feature of the tropical air-sea coupled system and the coupled disturbances and the characteristics of the coupled disturbances also sensitively depend on the value of n at which the Weber functions Dn(y) are truncated. The interactions are discussed between the atmospheric quasi-stationary Kelvin wave and the oceanic Rossby waves, the atmospheric quasi-stationary Kelvin wave and the oceanic Kelvin wave, the atmospheric quasi-stationary Kelvin wave and the oceanic Rossby waves, and the atmospheric quasi-stationary Rossby waves and the oceanic Rossby waves. The characteristics of the coupled disturbances are studied in detail..

项目使用定量方法分析热带太平洋上层热力、动力状况在不同时间尺度上的变率，研究其地理分布和垂直分布特征及其主控物理过程和因子，探讨变率大值区之间的相互关系和相互作用，建立与外部都有能量变换内部具有能量耗散能够反映海气耦合系统演变特征的非线性动力学-热力学模型。