Round and Round (IMAGE) Columbia Climate School Caption Driven by powerful winds, the Antarctic Circumpolar Current swirls clockwise around the southern continent. Hotter colors represent higher velocities; red dots are drill sites. Credit Gisela Winckler Usage Restrictions Credit must be given. License Original 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.