台湾以东黑潮锋的中尺度过程研究  

Study on the meso-scale process of the Kuroshio front to the east of Taiwan

作　　者：李威[1,2] 王琦[2] 马继瑞[1,2] 韩桂军[1,2] 张学峰[1,2] 

机构地区：[1]国家海洋局海洋环境信息保障技术重点实验室,天津300171 [2]国家海洋信息中心,天津300171

出　　处：《海洋通报》2011年第5期518-528,共11页Marine Science Bulletin

基　　金：国家重点基础研究发展计划课题(2007CB816001);国家自然科学基金项目(41030854;40906016;40906015)

摘　　要：采用海洋再分析结果,研究了海洋涡旋和锋面波动对台湾以东黑潮锋的影响,结果表明,Rossby波第一斜压模态形成的冷涡（暖涡）,减弱（增强）台湾以东黑潮温度锋强度,减小（加大）锋的宽度。在再分析结果中,捕获到1991年1-2月台湾以东的一次黑潮锋面波动。锋面波动的波槽（波脊）到达时,该温度锋强度减弱（增强）,宽度和厚度减小（增大）。对前人的与线性基态方程相对应的锋面波动扰动态能量诊断方程进行了拓展,推导出与非线性基态方程相对应的扰动态能量诊断方程。之后,使用上述扰动态能量诊断方程,初步分析了该锋面波动的能量来源,发现正压不稳定的贡献与斜压不稳定的贡献比K-H不稳定大1~2个数量级,而斜压不稳定的贡献约为正压不稳定的5倍,因此该锋面波动基本上由斜压不稳定性提供能量。By using the reanalysis data,the impact of oceanic eddies and frontal wave on Kuroshio front to the east of Taiwan（KFETW） is studied.The result indicates that cold eddies（warm eddies） corresponding to the first baroclinic mode of Rossby wave can weaken（strengthen） the strength of the KFETW and narrow（widen） the width of this front.A frontal wave of the KFETW during January to February in 1991 is detected from the reanalysis data.And the trough（crest） of the frontal wave may weaken（strengthen） the strength of the KFETW and narrow（widen） the width and thickness of this front.Diagnostic equation of frontal wave disturbance energy corresponding to linear basic state is extended and diagnostic equation corresponding to non-linear basic state is derived.It is found through the diagnostic analysis of the energy source of the frontal wave that the contribution of barotropic instability or that of baroclinic instability is more than that of K-H instability by 1~2 order of magnitude,and the contribution of the baroclinic instability is 4 times bigger than that of the barotropic instability,thereby the frontal wave is basically driven by the baroclinic instability.

关 键 词：黑潮锋 台湾以东 再分析 海洋涡旋 锋面波动 

分 类 号：P731.21[天文地球—海洋科学]