一个表面准地转涡旋在Beta平面自由漂移的数值模拟  

Numerical Simulation of the Beta Drift of a Surface Quasi-geostrophic Eddy

作　　者：张彤辉 张洋 潘嵩 李君益 ZHANG Tong-hui;ZHANG Yang;PAN Song;LI Jun-yi(College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang 524088,China;Key Laboratory of Marine Environmental Information Technology,Ministry of Natural Resources of China,Tianjin 300171,China)

机构地区：[1]广东海洋大学海洋与气象学院,广东湛江524088 [2]自然资源部海洋环境信息保障技术重点实验室,天津300171

出　　处：《广东海洋大学学报》2022年第2期71-78,共8页Journal of Guangdong Ocean University

基　　金：自然资源部海洋环境信息保障技术重点实验室开放基金课题(2019)。

摘　　要：【目的】研究一个表面准地转涡旋在β平面上的自由漂移及其驱动的流场、能谱演化。【方法】基于谱方法理想数值模拟,研究分析涡旋罗斯贝数以及β效应对流场演化的影响。【结果与结论】与准地转涡旋类似,表面准地转涡旋的漂移速度和其激发的罗斯贝波波速十分接近。漂移过程中不断生成的涡丝使得小尺度波段的能谱趋于k^(-2)结构。涡旋非线性和β效应可以增强涡旋漂移速度,提高涡丝生成速率。【Objective】This study investigates the initial evolution of a surface quasi-geostrophic(SQG)eddy on aβ-plane and the evolution of the associated flow field and energy spectrum.【Method】Idealized numerical simulation based on the spectral method is employed to show the dependence of the flow characteristics on the eddy Rossby number and the strength of theβ-effect.【Result and Conclusion】Similar to the quasi-geostrophic eddy,the drift velocity of the surface quasi-geostrophic eddy is very close to the wave velocity of its excited Rossby wave.The continuously generated eddy filaments during the drift make the small-scale spectrum converge to the k^(-2) structure.The eddy nonlinearity andβ-effect can enhance the eddy’s drift velocity and increase the rate of eddy filament generation.

关 键 词：表面准地转 β平面湍流 谱方法 数值模拟 

分 类 号：P731.26[天文地球—海洋科学]