Changes in wind in the upper troposphere (IMAGE) Tokyo Metropolitan University Caption Anomalous circulations can be seen in the upper troposphere, creating troughs and ridges that persist when comparing averages over the 2000's and the 2010's. Credit Tokyo Metropolitan University Usage Restrictions None 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.