Scientists find unequivocal evidence that thunderstorms move ozone from the stratosphere down toward Earth's surface, affecting air quality and climate.

A new study led by NASA and NCAR shows that tropical forests may be absorbing far more human-emitted carbon dioxide than many scientists thought.

A piece of coral in a University of Arizona lab has revealed a link between Pacific trade winds and shifts in 20th century climate.

New research demonstrates that an increase in greenhouse gas concentrations thousands of years ago was a key factor in causing substantially more rainfall in two major regions of Africa.

Find answers to questions about these atmospheric patterns, which play a key role in year-to-year weather and climate variation around the world.