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Mesoscale vortex identification method based on sea surface height anomaly and rotation speed

A technology of rotation speed and identification method, which is applied in the field of eddy identification, and can solve problems such as the complex structure of ocean circulation

Inactive Publication Date: 2021-09-24
THE FIRST INST OF OCEANOGRAPHY SOA
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Problems solved by technology

[0004] The discovery of a large number of mesoscale vortices has made people realize that the structure of ocean circulation is more complicated than traditional understanding

Method used

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  • Mesoscale vortex identification method based on sea surface height anomaly and rotation speed
  • Mesoscale vortex identification method based on sea surface height anomaly and rotation speed
  • Mesoscale vortex identification method based on sea surface height anomaly and rotation speed

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Embodiment

[0053] A method for identifying mesoscale eddies based on sea surface height anomalies and rotation speeds, comprising the following steps:

[0054] S1. Judgment of possible cyclonic vortices. For the sea surface height anomaly data with a spatial resolution of 0.25°, firstly, within a 1°×1° latitude and longitude moving window, find the local minimum or maximum value of SLA to judge possible cyclonic vortices or the center of the anticyclonic vortex;

[0055] S2. Determine the SLA closed contour. For each possible cyclonic vortex or anticyclonic vortex center, look for the SLA closed contour from the inside with an increase or decrease of 1cm, and determine the five-point condition. SLA closed contour:

[0056] (1) For cyclonic vortex or anticyclonic vortex, the SLA value of all grid points in the closed contour is smaller or larger than the SLA value of the closed contour;

[0057] (2) There are no less than 8 grid points and no more than 1000 grid points in the closed con...

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Abstract

The invention relates to the technical field of vortex identification, and provides a mesoscale vortex identification method based on sea surface height anomaly and rotation speed, which comprises the following steps of: 1) judging possible air vortexes, and aiming at sea surface height anomaly data with the spatial resolution of 0.25 degree, determining a rotation speed; in a 1-degree * 1-degree longitude and latitude moving window, finding a minimum or maximum value of a sea surface height abnormal local, so as to judge the center of a possible air vortex or anti-air vortex; and 2) determining a sea surface height abnormal closed isoline, finding out the sea surface height abnormal closed isoline from the inside of each possible air vortex or anti-air vortex center at an amplification or reduction amplitude of 1cm, and determining the sea surface height abnormal closed isoline meeting a five-point condition. By recognition steps, the mesoscale vortex in the ocean can be effectively identified, the outer boundary range and the vortex type of the mesoscale vortex can be accurately determined through calculation, and an accurate guidance basis is provided for people to find, develop and utilize the mesoscale vortex.

Description

technical field [0001] The invention relates to the technical field of vortex identification, in particular to a mesoscale eddy identification method based on sea surface height anomalies and rotation speeds. Background technique [0002] 1. Oceans and mesoscale eddies [0003] The ocean, like the atmosphere, is a fundamentally turbulent system. When we observe the changes of the sea surface, we can find that the most obvious is that the ocean is full of various mesoscale eddies (eddies) and meandering currents (menders). This circulation is actually dominated by changes in mesoscale ocean phenomena, including ocean eddies, isolated dipoles, meanders, fronts, and jets. The mesoscale vortex is a disturbance of large-scale stable circulation characterized by long-term closed circulation (vortex), with a time scale ranging from several days to hundreds of days and a spatial scale ranging from tens to hundreds of kilometers. The baroclinic instability of large-scale circulati...

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Application Information

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IPC IPC(8): G06F17/10G06K9/00
CPCG06F17/10
Inventor 崔伟杨俊钢
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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