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This animation shows a nearly 20-year record of temperature anomalies for two layers in Earth's atmosphere: the lower troposphere, where most of the planet's weather occurs; and the upper stratosphere, which contains the ozone layer. NASA's Atmospheric Infrared Sounder (AIRS), aboard the Aqua satellite, captured these measurements from 2002 to 2020. Preliminary data analysis shows a warming trend for the lower troposphere, and a strong cooling trend in the upper stratosphere. The globes show a map of where warmer than average or cooler than average temperatures for each atmospheric layer occurred during this time period. The line graphs show the deviation of temperatures averaged over the entire planet for the lower troposphere and upper stratosphere.

AIRS, in conjunction with the Advanced Microwave Sounding Unit (AMSU), senses emitted infrared and microwave radiation from Earth to provide a three-dimensional look at the planet's weather and climate. Working in tandem, the two instruments make simultaneous observations down to Earth's surface. With more than 2,000 channels sensing different regions of the atmosphere, the system creates a global, three-dimensional map of atmospheric temperature and humidity, cloud amounts and heights, greenhouse gas concentrations and many other atmospheric phenomena. Launched into Earth orbit in 2002 aboard NASA's Aqua spacecraft, the AIRS and AMSU instruments are managed by NASA's Jet Propulsion Laboratory in Southern California, under contract to NASA. JPL is a division of Caltech.

More information about AIRS can be found at https://airs.jpl.nasa.gov.