Thunderstorm (image) National Center for Atmospheric Research/University Corporation for Atmospheric Research Share Print E-Mail Caption Showers and thunderstorms over the tropics can grow from isolated systems, as shown here in the Maldives, to larger complexes that loft vast quantities of air from the lower atmosphere to the stratosphere. CONTRAST will examine how such circulations evolve over the western tropical Pacific, where they can influence atmospheric chemistry over wide areas. Credit Photo courtesy Adam Sobel, Columbia University Usage Restrictions Media and nonprofit use permitted with credit as indicated above. 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.