Five years (2015-2019) of global eddy product from SEIA

Five years of global eddy product from 2015 to 2019 is generated from a scale-selective eddy identification algorithm (SEIA) based on closed sea level anomalies (SLAs) dataset from the French Archiving, Validation, and Interpretation of Satellite Oceanographic Data (AVISO) project. SEIA features two improvements in the detection and tracking processes over earlier algorithms. First, based on the data resolution and eddy spatial scale, the scale-selective scheme replaces the previously used threshold for defining the eddy boundary and restricts the numbers of upper and lower grid points. The eddy boundary is as large as possible under such conditions, yet the eddy region is not overestimated. Furthermore, a novel and effective overlap scheme is used to track eddies by calculating the intersecting ratio of time-step-successive eddies. SEIA generates 278,630 anticyclonic eddies and 274,351 cyclonic eddies over five years for both the north and south hemispheres. SEIA runs on the MATLAB and outputs series of eddies as mat files with information of eddy existing time, boundary, radius and so on.