盐度是海洋的一个基本状态变量，在深对流发生区域的海表盐度直接影响着大西洋经圈翻转环流（AMOC）的形态、强度和年代际变率。在海洋模式中，盐度边界条件直接决定着海表盐度的模拟，因此，盐度边界条件对AMOC的模拟起着重要的作用，目前对此的研究主要集中在不同的盐度恢复系数和高纬度淡水强迫异常对AMOC的影响，关于中低纬度海水特性对AMOC的影响依然存在很大的不确定性。有鉴于此，本项目计划以新的盐度边界条件为基础，将不同的盐度边界条件分别引入到不同复杂程度的海洋模式和耦合模式中，系统地研究不同盐度边界条件对AMOC模拟的影响，并从不同盐度边界条件对中低纬度和高纬度区域的盐度和层结影响出发，探究不同盐度边界条件对AMOC模拟影响的机理。项目研究成果对进一步认识盐度边界条件对AMOC模拟的影响和机理有重要作用，并有助于海洋模式和气候系统模式的发展。

Salinity is a basic oceanic state variable. The sea surface salinity in the deep convective region directly affects the magnitude, shape and decadal variability of the Atlantic meridional overturning circulation (AMOC). In oceanic model, the surface salinity boundary condition directly determines the simulation of sea surface salinity. Therefore, the surface salinity boundary condition plays an important role in the simulation of AMOC. The commonly study focuses on the effects of different salinity restoring coefficients and high-latitude freshwater forcing anomalies on AMOC, and the relationship between the AMOC at subpolar and subtropical latitudes is still poorly understood. In view of this, this study is based on a new salinity boundary condition, to evaluate the impact of the surface salinity boundary conditions on AMOC by introducing different salinity boundary conditions into models with varying degrees of complexity (simplified ocean model, stand-alone ocean model and coupled model). Besides, this plan investigates its mechanism from effects of the salinity boundary conditions on the salinity and stratification in the mid-low latitudes and high latitudes. The research has an important role in further understanding the influence of salinity boundary conditions on the simulation and mechanism of AMOC, and is helpful for the development of oceanic model and climate system model.