太平洋暖池东边界盐度结构的形成和变异机制及其与ENSO的关系

西太平洋暖池东边界特殊的盐度结构－障碍层和盐度锋，对暖池变异和ENSO发展具有不可忽视的贡献。本项目拟通过最新观测资料与海洋模式数据，对暖池东边界的盐度结构的形成与变异机制及其与ENSO的关系进行定量化研究。.1）对暖池东边界的混合层内的盐度收支进行统计分析。获得表面淡水通量、平流过程、垂向夹卷以及混合过程等各分量在不同时间尺度的变化规律和空间分布情况； .2）使用示踪物浓度回溯/追踪方法（对暖池东边界的盐度锋和障碍层进行同步-分区式的回溯和追踪实验，定量化分析盐度锋和障碍层的形成与变异机制。.期望通过本研究能够.1）阐明不同海洋动力过程在盐度锋和障碍层形成与变异中的具体作用；.2）揭示障碍层与盐度锋的形成机制与变异规律，定量分析障碍层和盐度锋对表层密度场及混合层的影响；.3）揭示盐度及其相关的海洋动力过程与暖池表层的热量累积和纬向迁移之间的量化关系，评估其对ENSO现象的具体贡献。

The salinity structure near the eastern edge of the western Pacific Warm Pool(WP), barrier layer and salinity front, play a nonnegligible role on the variation of WP and the development of ENSO. Therefore, we plan to study the formation and variation of the salinity structure in this area and their relations to ENSO, by using the up-to-date observations and well simulated ocean model data. .1）To analysis the mixed layer salinity budget near the eastern edge of WP, so as to obtain the spatial distribution and temporal variability of freshwater flux, Horizontal advection, vertical entrainment and mixing on different time scales. .2）To conduct the backward and forward tracing of the waters near the eastern edge of WP, by using the JPL passive tracer and its adjoint, quantitatively analysis the mechanisms of the formation and variation of barrier layer and salinity..According to this study, we expect to.1）clarify the effects of different ocean dynamic process on the barrier layer and salinity front in detail..2） reveal mechanisms of the formation and variation of barrier layer and salinity front，quantify their effects on the sea surface density and mixed layer depth. .3）make better understand on the relation between the ocean dynamics and the heat buildup and zonal displacement quantitatively, give a detailed evaluation on the contribution to the ENSO development.