2004年至2008年间棉兰老穹窿海域温跃层深度变化对涡旋动能的影响

发布时间：2019-01-27 17:58

【摘要】：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。
[Abstract]:The variation characteristics of vortex kinetic energy (Eddy Kinetic Energy,EKE) in the Mindanao Dome (Mindanao Dome,MD) from 2004 to 2008 were investigated by using the sea surface height anomalies observed by satellite and the global assimilation data of the HYCOM (Hybrid Coordinate Ocean Model) model. The physical mechanism influencing the time variation of EKE is also discussed. It is found that the variation of EKE in MD area is closely related to the depth of thermocline. From 2004 to 2008, the depth of thermocline in MD sea area gradually deepened, which resulted in the weakening of meridional gradient of background current field and the gradual decrease of EKE in the southern waters of MD. It is further found that the variation 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 influence of the density gradient is mainly on the subsurface layer. From 2004 to 2008, the ENSO signal and the local wind stress curl did not cause the response of the background field to the meridional gradient, so the effect on the EKE was not obvious.
【作者单位】：中国海洋大学海洋与大气学院;中国人民解放军92925部队;
【基金】：国家自然科学基金项目(41176004) 中国科学院战略性先导科技专项基金项目(XDA11010203) 国家重点基础研究发展规划项目(G2012CB417401)资助
【分类号】：P731.27

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