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A numerical study of the string function using a primitive equation ocean model

 

作者: R.H. Tyler,   R. Käse,  

 

期刊: Geophysical & Astrophysical Fluid Dynamics  (Taylor Available online 2000)
卷期: Volume 92, issue 1-2  

页码: 65-83

 

ISSN:0309-1929

 

年代: 2000

 

DOI:10.1080/03091920008203711

 

出版商: Taylor & Francis Group

 

关键词: Potential vorticity;geostrophic contours;string function;eddy propagation;rossby wave;numerical model

 

数据来源: Taylor

 

摘要:

We use results from a primitive-equation ocean numerical model (SCRUM) to test a theoretical 'string function' formulation put forward by Tyler and Käse in another article in this issue. The string function acts as a stream function for the large-scale potential energy flow under the combined beta and topographic effects. The model results verify that large-scale anomalies propagate along the string function contours with a speed correctly given by the cross-string gradient. For anomalies having a scale similar to the Rossby radius, material rates of change in the layer mass following the string velocity are balanced by material rates of change in relative vorticity following the flow velocity. It is shown that large-amplitude anomalies can be generated when wind stress is resonant with the string function configuration.

 

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