Columbia Researchers Provide New Evidence on the Reliability of Climate Modeling (image) Columbia University School of Engineering and Applied Science Share Print E-Mail Caption Clouds from deep convection over the tropical Pacific ocean, photographed by the space shuttle. Such convective activity drives the Hadley circulation of the atmosphere. Credit NASA Usage Restrictions Please credit as: NASA 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.