Walker circulation (image) National Center for Atmospheric Research/University Corporation for Atmospheric Research Share Print E-Mail Caption This diagram shows the Walker Circulation, a vast loop of air above the equatorial Pacific ocean. Credit Illustration courtesy Gabriel Vecchi, UCAR. Usage Restrictions None Share Print E-Mail 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.