Method for detecting vortex penetration spring layers based on vorticity positive value

Abstract

The invention discloses a method for detecting vortex penetrating spring layers based on a vorticity positive value, and belongs to the technical field of oceans. The method comprises the following steps: (1) selecting a three-dimensional calculation region according to a vortex influence area, and establishing a discrete grid; (2) calculating a horizontal average vorticity value of the selected area by using a corresponding formula; (3) drawing a vorticity positive value horizontal average vertical profile according to a time sequence; (4) finally, calculating the average buoyancy frequency vertical profile of the selected area, and judging whether the vortex upwelling can penetrate through the spring layer or not by combining the average buoyancy frequency vertical profile and the vorticity positive value horizontal average vertical profile. According to the method, the three-dimensional calculation area is selected, the vorticity positive value can be accurately calculated, whetherthe upwelling can penetrate through the skip layer or not is judged through the vorticity positive value horizontal average vertical profile and the average buoyancy frequency vertical profile, and the method is accurate and visual.

Description

technical field [0001] The invention relates to the field of marine technology, in particular to a method for detecting vortex penetrating layers based on positive vorticity values. Background technique [0002] The passage of a typhoon tends to form a counterclockwise cyclone vortex in the upper ocean. As the vortex increases, an upwelling will be formed in the center of the cyclone vortex. This upwelling can bring rich nutrients from the bottom to the surface. But due to the ocean thermocline, when the upwelling is weak, nutrients from the bottom cannot penetrate the pyrocline. At present, the commonly used methods for studying the impact of typhoons on oceanic cold vortices are mostly based on plane dynamic parameters, such as Rossby number, shear and dispersion, etc. It is difficult to effectively calculate the vorticity value, and cannot effectively determine whether the upwelling can penetrate the cline. Contents of the invention [0003] The technical problem to be...

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Problems solved by technology

However, due to the existence of the ocean thermocline, when the upwelling is weak, the nutrients at the bottom cannot penetrate the densocline

At present, the commonly used methods for studying the impact of typhoon on the oceanic cold vortex are mostly based on plane dynamic parameters, such as Rossby number, shear and dispersion, etc. It is difficult to effectively calculate the vorticity value, and cannot effectively determine whether the upwelling can penetrate the climatic layer

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