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利用卫星观测的海表面高度异常数据和HYCOM(Hybrid Coordinate Ocean Model)模式的全球同化数据,考察了2004年至2008年间棉兰老穹窿(Mindanao Dome,MD)海域涡旋动能(Eddy Kinetic Energy,EKE)的变化特征,并探讨了影响EKE时间变化的物理机制,发现MD海域EKE变化和温跃层深度变化密切相关。从2004-2008年间,MD海域温跃层深度逐渐加深,导致背景流场的经向梯度减弱,引起MD南部海域EKE的逐渐降低。进一步研究发现EKE的变化是背景密度场和流场经向梯度共同影响的结果,其中流场梯度的影响更大,密度梯度的影响则主要在次表层。而2004年至2008年间ENSO信号和局地风应力旋度因未引起背景场经向梯度的响应,故对EKE的影响并不明显。
Using the data of satellite surface height anomaly and global assimilation data of HYCOM (Hybrid Coordinate Ocean Model) model, the eddy kinetic energy (EKE) of Mindanao Dome (MD) ), And explores the physical mechanism that affects the time variation of EKE. It is found that the change of EKE in the MD sea area is closely related to the change of the depth of the thermocline. From 2004 to 2008, the depth of the thermocline in the MD sea area gradually deepened, resulting in a decrease in the meridional gradient of the background flow field, causing the EKE in the southern part of the MD to decrease gradually. The further study shows that the change of EKE is the result of both the background density field and the meridional gradient of the flow field, in which the influence of the gradient of the flow field is greater and the effect of the density gradient is mainly on the subsurface. However, the ENSO signal and the local wind curl of the wind from 2004 to 2008 have no obvious effect on the EKE because they did not cause the response of the meridional gradient of the background field.