一种改进的HYCOM模式垂向坐标分层方法和模拟试验

An improved vertical coordinate layered approach HYCOM and model experiments

针对22层的HYCOM海洋模式的不足,本文根据北太平洋位势密度的时空分布特征,建立了一种28层的垂向分层方法,并比较了28层HYCOM模式与22层HYCOM模式在积分过程中能量的变化,以及表层流场和赤道断面流系的模拟效果。结果显示:在模式积分过程中,本文采用的28层垂向坐标模式比传统22层模式对强迫场的响应更快,对动能的摄入更大,并且更加容易达到稳定状态;对于流场的刻画,28层模式对赤道表层流系和赤道潜流相比22层模式有明显改进。

For the lacking of 22-layers HYCOM, the vertical resolution is increased to 28-layers in this paper based on the potential density distribution and seasonal variations in the China Sea. Two types of HYCOM have been taken to compare the energy integration process, as well as the surface and the equatorial section flow field.The result shows: in the model integration process, the 28-layers vertical coordinate mode has a more faster response to the forcing field than the traditional 22-layer model, and can spin up in less time; for the characterization of the flow field, there is a significant improvement in the simulation capability of the equatorial current system and the equatorial undercurrent.