Dynamics of bottom-water warming by using a full-depth four-dimensional variational ocean data assimilation system

我在这里关注的是在世界各地的深海中发现的海底变暖。我使用超级计算机模拟表明，南大西洋和南印度洋的海底变暖可以追溯到50年来南极环极环流区域地下温度和速度的变化。这表明，50多年来发生的底水变暖可能与地表热量和淡水通量的变化或地表动量通量的变化有关。这一发现可能是揭示海洋热收支变化机制和深海水性质变化的关键因素。此外，监测海洋热含量变化的最佳观测系统设计是另一项成就。

I here focus on the bottom-water warming revealed in abyssal ocean over the world. I use a supercomputer simulation to show that the bottom-water warming in the South Atlantic and South Indian Oceans can be traced back to the changes in subsurface temperature and velocity around the Antarctic Circumpolar Circulation region within the period of 50 years. This implies that the bottom-water warming possibly related to changes in the surface heat and freshwater fluxes occurred more than 50 years or changes in the surface momentum fluxes. This finding may be a key factor to reveal the mechanism of changes in the ocean heat budget, the changes in the abyssal water properties.Further, optimal observing system design for monitoring variations of the ocean heat content is another achievement.