Old method, new method (IMAGE) University of Tokyo Caption The upper contour map shows a model of the cyclones and anticyclones superimposed on the westerly jet stream according to the previous standard for modeling cyclones, relative vorticity. The lower contour map shows the same, but uses the team's new method, based on local curvature or shape. Credit ©2021 Okajima et al. Usage Restrictions Credit ©2021 Okajima et al. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.