局地混合率变化对热带太平洋SST的影响

The Effect of the Change of Local Mixing Coefficient on SST in the Equatorial Pacific Ocean

利用1个等密度面坐标大洋环流模式,研究了热带太平洋地区局地混合率变化对局地海表面温度的影响。研究表明,局地混合率的变化对热带中-东部地区以及海盆东边界处的海表面温度影响较强,而对海盆西部的海表面温度影响较弱,这些影响主要与局地温跃层的深度有关,此外海洋表层与温跃层的温度差等也会对局地海表面温度产生影响。

By using an oceanic general circulation model based on the isopycnal coordinate, the effect of the change of local mixing coefficient on local sea surface temperature（SST） was examined. The result showed that SST in the central-eastern tropical Pacific and the eastern boundary was very sensitive to the change of local mixing coefficient, while the effect to the western Pacific was poor. The magnitude of the effect was mainly dependent on the depth of the local thermocline. In addition, the temperature difference between the sea surface and the thermocline may also affect the local SST.