File:Concentration of Atmospheric Carbon Dioxide from Earth's Mid-Troposphere, 2002 to 2013 (8787670559).jpg

English: This graph made with data from the Atmospheric Infrared Sounder on NASA's Aqua satellite shows the concentration of carbon dioxide in Earth's mid-troposphere, located roughly between 3 to 6 miles (5 to 9 kilometers) in altitude.

The sawtooth pattern reflects plants "breathing in" carbon dioxide as they grow, removing this gas from the atmosphere. Soil and plants then release carbon dioxide back into the atmosphere when plants die at the end of the growing season. The upward slope of the graph shows the continuous increase in the concentration of carbon dioxide in Earth's atmosphere.

The concentration of carbon dioxide in the mid-troposphere lags the concentration found at Earth's surface as mixing from the lower to upper altitudes usually takes days to weeks. In addition, changes in concentration of carbon dioxide at Earth's surface are not always carried up to higher altitudes.

While AIRS is able to detect carbon dioxide in Earth's atmosphere to an accuracy of 4 parts per million (ppm), the precision of the measurement clearly corroborates the roughly 2 ppm annual increase in the concentration of this greenhouse gas.

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About AIRS The Atmospheric Infrared Sounder, AIRS, in conjunction with the Advanced Microwave Sounding Unit, AMSU, sense emitted infrared and microwave radiation from the Earth to provide a three-dimensional look at Earth's weather and climate. Working in tandem, the two instruments make simultaneous observations all the way down to the Earth's surface, even in the presence of heavy clouds. 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. The AIRS and AMSU fly onboard NASA's Aqua spacecraft and are managed by the Jet Propulsion Laboratory, Pasadena, California, under contract to NASA. JPL is a division of the California Institute of Technology in Pasadena.

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

Image Credit NASA/JPL AIRS Project

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